feat(tool-fs): result-time applied-hunk diffs for write/edit

fs write/edit now emit a result-time contextual-diff tool_call_update
(the applied hunk with ±3 context lines, one hunk per replace_all site),
matching what claude-agent-acp sends and what makes an editor render the
change in place. The call-time snippet diff stays; the result hunk
supersedes it (ACP content-replace).

Mechanism:
- A persisted tool-private `meta` channel: execute may return
  `{ content, meta }`; `meta` (JsonValue) rides on the tool/result event
  and is handed back to presentResult, so the diff reproduces on replay
  (event-sourced). JsonValue is now exported from dsh-session.
- The backend returns raw before/after text (storage facts) on
  FsWriteOutcome/FsEditOutcome; the tool computes the hunk via the npm
  `diff` package's structuredPatch. A create has no before → no result
  diff; a failed/aborted mutation carries no meta.
- ToolResultView gains a DiffResultView; the bridge's result-side switch
  renders it as {type:'diff'} content blocks.

RFC: docs/rfc/implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.md
(justifies the npm `diff` runtime dep over vendoring and the meta channel);
the render-intent-union RFC's Non-goal is updated to record this shipped.
All fs snapshot goldens re-recorded; edit/overwrite gain the contextual
result diff, create/read/policy-reject unchanged in structure.

docs/cordis-catalog/events-and-services.md

@@ -259,7 +259,7 @@ A session was created in the store.
 'session/created'(session: Session): void
 ```
 
-Source: [`packages/core/session/src/index.ts:34`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:35`](../../packages/core/session/src/index.ts)
 
 #### `session/event` — emit
 
@@ -271,7 +271,7 @@ An event was appended to a session log (sync, fire-and-forget). This is the per-
 
 Types: [SessionEvent](../core-data-structures/core.md)
 
-Source: [`packages/core/session/src/index.ts:40`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:41`](../../packages/core/session/src/index.ts)
 
 #### `session/flush` — parallel
 
@@ -281,7 +281,7 @@ Awaited durability checkpoint. The agent loop awaits `ctx.parallel('session/flus
 'session/flush'(session: Session): Promise<void> | void
 ```
 
-Source: [`packages/core/session/src/index.ts:49`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:50`](../../packages/core/session/src/index.ts)
 
 ### `subagent/*`
 
@@ -337,7 +337,7 @@ A tool was registered or unregistered (the available tool set changed).
 'tools/change'(): void
 ```
 
-Source: [`packages/core/tools/src/index.ts:48`](../../packages/core/tools/src/index.ts)
+Source: [`packages/core/tools/src/index.ts:49`](../../packages/core/tools/src/index.ts)
 
 #### `tools/execute` — waterfall
 
@@ -349,7 +349,7 @@ Waterfall around every tool execution — the single seam where sandbox, permiss
 
 Types: [ToolExecution](../core-data-structures/tools.md) · [ToolExecutionResult](../core-data-structures/tools.md)
 
-Source: [`packages/core/tools/src/index.ts:43`](../../packages/core/tools/src/index.ts)
+Source: [`packages/core/tools/src/index.ts:44`](../../packages/core/tools/src/index.ts)
 
 ## Services
 
@@ -507,7 +507,7 @@ get(id: SessionId): Session | undefined
 list(): Session[]
 ```
 
-Source: [`packages/core/session/src/index.ts:322`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:323`](../../packages/core/session/src/index.ts)
 
 ### `ctx.subagents` — `SubagentService`
 
@@ -547,7 +547,7 @@ async execute(exec: ToolExecution): Promise<ToolExecutionResult>
 
 Types: [ToolDefinition](../core-data-structures/tools.md) · [ToolExecution](../core-data-structures/tools.md) · [ToolExecutionResult](../core-data-structures/tools.md)
 
-Source: [`packages/core/tools/src/index.ts:319`](../../packages/core/tools/src/index.ts)
+Source: [`packages/core/tools/src/index.ts:370`](../../packages/core/tools/src/index.ts)
 
 ## Inherited tier (cordis core + loader/hmr/timer)
 

docs/core-data-structures/filesystem.md

@@ -52,6 +52,8 @@ type FsWriteIntent =
 interface FsWriteOutcome {
   operation: 'create' | 'update'
   version: FsVersion
+  before: string | null
+  after: string
 }
 ```
 
@@ -70,6 +72,8 @@ interface FsEditOutcome {
   replacements: number
   replaceAll: boolean
   version: FsVersion
+  before: string
+  after: string
 }
 ```
 

docs/core-data-structures/session.md

@@ -32,7 +32,7 @@ interface SessionEventMap {
    */
   'assistant/message': { turn: number; step: number; content: ContentBlock[]; usage?: TokenUsage }
   'tool/call': { turn: number; step: number; callId: CallId; name: string; arguments: string }
-  'tool/result': { turn: number; step: number; callId: CallId; content: ContentBlock[]; isError: boolean; error?: { name: string; code: string } }
+  'tool/result': { turn: number; step: number; callId: CallId; content: ContentBlock[]; isError: boolean; error?: { name: string; code: string }; meta?: JsonValue }
   /** Steering content injected between steps of a running turn. */
   'steering/message': { turn: number; content: ContentBlock[]; source: MessageSource }
   /**

docs/core-data-structures/tools.md

@@ -10,7 +10,7 @@ A `ToolSchema` (the model-facing fields) plus the `execute` function and optiona
 
 ```ts type-equiv
 interface ToolDefinition extends ToolSchema {
-  execute(args: unknown, exec: ToolExecution): Promise<ContentBlock[]>
+  execute(args: unknown, exec: ToolExecution): Promise<ToolExecuteReturn>
   /**
    * Optional: how to present the PENDING state of one call in a UI, derived from
    * the call's `args` (parsed arguments, `unknown` — the tool validates/narrows
@@ -100,6 +100,13 @@ interface ToolExecutionResult {
    * text in `content` is always present; this is extra structure for code.
    */
   error?: ToolErrorInfo
+  /**
+   * The tool-private presentation payload from a successful `execute` (the object
+   * return form). Threaded onto the `tool/result` session event and back into
+   * {@link ToolResult} for `presentResult`. Opaque {@link JsonValue}; absent when
+   * the tool attached none or the call failed.
+   */
+  meta?: JsonValue
 }
 ```
 

docs/module-graph.md

@@ -40,6 +40,7 @@ graph TD
   session-persistence-sqlite --> session-persistence
   tools --> agent
   tools --> llm
+  tools --> session
   tools --> system-prompt
   ui-stdio --> agent
   ui-stdio --> llm
@@ -64,6 +65,7 @@ graph TD
   tool-bash --> tools
   tool-fs --> fs
   tool-fs --> llm
+  tool-fs --> session
   tool-fs --> system-prompt
   tool-fs --> tools
   tool-todo --> agent
@@ -128,13 +130,13 @@ graph TD
 | `invariants` | `agent`, `llm`, `session` |
 | `session-persistence-jsonl` | `session`, `session-persistence` |
 | `session-persistence-sqlite` | `session`, `session-persistence` |
-| `tools` | `agent`, `llm`, `system-prompt` |
+| `tools` | `agent`, `llm`, `session`, `system-prompt` |
 | `ui-stdio` | `agent`, `llm`, `session` |
 | `acp` | `agent`, `llm`, `session`, `session-persistence`, `tools` |
 | `agent-loop` | `agent`, `llm`, `session`, `session-persistence`, `system-prompt`, `tools` |
 | `subagent` | `agent`, `llm`, `tools` |
 | `tool-bash` | `agent`, `bash`, `llm`, `tools` |
-| `tool-fs` | `fs`, `llm`, `system-prompt`, `tools` |
+| `tool-fs` | `fs`, `llm`, `session`, `system-prompt`, `tools` |
 | `tool-todo` | `agent`, `session`, `tools` |
 | `agent-core` | `agent`, `agent-loop`, `invariants`, `llm`, `session`, `system-prompt`, `tool-bash`, `tools` |
 | `subagent-acp` | `agent`, `llm`, `subagent` |

docs/rfc/README.md

@@ -126,6 +126,7 @@ Do NOT write one for a mechanical or local choice (a variable name, a one-file r
 | [Make `dsh-fs-policy` an event-gate plugin, not a method interface](implemented/architecture/2026-06-26-file-context-as-event-gate.md) | 2026-06-26 |
 | [Resolve filesystem paths against the caller's session cwd](implemented/architecture/2026-07-02-fs-per-session-cwd.md) | 2026-07-02 |
 | [Tagged render-intent union for tool-call presentation](implemented/architecture/2026-07-02-tool-render-intent-union.md) | 2026-07-02 |
+| [Result-time applied-hunk diffs for file mutations](implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.md) | 2026-07-02 |
 
 ### Process
 

docs/rfc/implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.md

@@ -0,0 +1,54 @@
+# RFC: Result-time applied-hunk diffs for file mutations
+
+Status: implemented
+
+## Problem
+
+The [tagged render-intent union](2026-07-02-tool-render-intent-union.md) gave `dsh-tool-fs` write/edit a `card:'diff'` at CALL time, derived purely from the tool's args: write ⇒ `{oldText:null, newText:content}` (the whole new file), edit ⇒ `{oldText:old_string, newText:new_string}` (the bare replaced snippet). An editor renders that as an inline diff, but it is a **context-free** diff — the bare `old_string`→`new_string` with no surrounding lines, and a `replace_all` that touched five scattered sites still renders as one snippet pair.
+
+Driving `claude-agent-acp`'s own ACP bridge shows what a full editor diff looks like: after the mutation applies, it emits a SECOND `tool_call_update` whose diff is the **applied hunk with ±3 context lines** (and one hunk per changed site for `replace_all`), reconstructed from the tool's `structuredPatch`. That result-time hunk is what makes Zed show the change *in place* in the file rather than as a floating snippet. Our tools stopped at the call-time snippet; the completed result carried only the plain "updated successfully" text, no diff.
+
+The obstacle is a seam boundary: `presentResult(args, result)` is a **pure function of `args` + the model-facing `result` (`{content, isError}`)** — it runs on live streaming AND on session-log replay, so it must be replay-deterministic and cannot do I/O. It never sees the file's before/after content, and `FsEditOutcome`/`FsWriteOutcome` carried only a replacement count + version, not the text. So there was no way to compute — or even carry — an applied hunk to the presenter.
+
+## Decision
+
+Add a **persisted, tool-private presentation channel** so a tool's `execute` can attach a result-time render payload that survives replay, and use it to carry the applied-hunk diff.
+
+### 1. A `meta` channel on the tool result (core)
+
+`ToolDefinition.execute` may now return either its model-facing `ContentBlock[]` (unchanged, the common case) OR `{ content: ContentBlock[]; meta?: JsonValue }`:
+
+```ts ignore-check
+type ToolExecuteReturn = ContentBlock[] | { content: ContentBlock[]; meta?: JsonValue }
+```
+
+`meta` is an opaque, JSON-serializable payload the core never interprets. The registry threads it onto the `tool/result` **session event** (`{ …, meta?: JsonValue }`), so it is persisted with the log; on replay the same `meta` is read back and handed to `presentResult` via a widened `ToolResult` (`{ content, isError, meta? }`). Because the payload lives in the event log, the diff reproduces on session reload / snapshot replay **for free** — the event-sourcing guarantee, not a re-computation. `JsonValue` is exported from `dsh-session` (paired with the existing `isJsonValue` predicate that already gates every event's serializability at `append`).
+
+This is the general shape ("a tool attaches durable result presentation"), not an fs-specific one — any tool can use it.
+
+### 2. The tool computes the hunk; the backend returns before/after (fs)
+
+Per the [capability-seam split](2026-06-13-capability-seams.md), the storage backend returns only **storage facts** and the model-facing tool owns **presentation**:
+
+- `dsh-fs` widens `FsEditOutcome` with `{ before: string; after: string }` and `FsWriteOutcome` with `{ before: string | null; after: string }` (`before: null` ⇒ a create, or an existing-but-undiffable binary/non-UTF-8 file). The local backend already holds both texts at write time; it returns them as raw LF-normalized text, with **no diff/UI concept** entering the seam.
+- `dsh-tool-fs` computes the contextual hunk from before/after and attaches it as `meta: { diffs: FileDiff[] }`. A result diff is emitted only when a before-version exists — edit always; write on overwrite; **a create emits none** (there is no before), matching `claude-agent-acp`'s empty `structuredPatch` on create. A failed/aborted/policy-rejected mutation applied nothing, so it carries no `meta` and renders no result diff.
+
+### 3. The bridge renders a `diff` result card
+
+`ToolResultView` gains a `DiffResultView { card:'diff'; title?; diffs: FileDiff[] }`; the bridge's result-side `switch (view.card)` gets a `diff` arm emitting the `{type:'diff'}` `ToolCallContent` blocks (mirroring the call-side arm). An ACP `tool_call_update.content` REPLACES the call's content in an editor, so the result-time contextual hunk **supersedes** the call-time snippet — the two-update sequence (call snippet, then result hunk) matches `claude-agent-acp` exactly.
+
+### The diff algorithm — a third-party runtime dependency over vendoring
+
+Computing hunks-with-context is a solved problem with sharp edge cases (grouping, context coalescing, the trailing-newline marker). Rather than hand-roll it, `dsh-tool-fs` takes a runtime dependency on the npm [`diff`](https://www.npmjs.com/package/diff) package (v9, ships its own types) and uses its `structuredPatch`. The repo's default is to vendor Cordis-framework source, but that policy is about the *framework*; a leaf tool package taking a small, well-known, self-typed utility dependency is the same shape as `dsh-acp` depending on `@agentclientprotocol/sdk`. Vendoring a diff algorithm would be re-implementing a battle-tested one for no benefit — the [pre-release "foundation over blast radius"](../../../../AGENTS.md) reasoning does not argue for re-deriving standard algorithms. The dependency is pinned and its output is normalized in one small module (`packages/fs/tool-fs/src/diff.ts`).
+
+## Non-goals
+
+- **Live incremental diff streaming.** The hunk is computed once, after the mutation completes; there is no per-keystroke diff.
+- **Diffing a binary/non-UTF-8 overwrite.** `before` is `null` for such a file (it has no text diff basis); the write still succeeds and renders the call-time card only.
+- **Rename/move diffs.** Only content diffs of a single resolved path.
+
+## Related
+
+- Completes the one remaining representation difference named as a non-goal in [Tagged render-intent union](2026-07-02-tool-render-intent-union.md) — that RFC's Non-goals section is updated to record that applied-hunk diffs shipped here.
+- Builds on the [filesystem capability seam](2026-06-17-filesystem-capability-seam.md) (the before/after are storage facts the backend returns) and [event-sourced sessions](2026-06-11-event-sourced-sessions.md) (the `meta` payload persists on the `tool/result` event, so replay reproduces the card).
+- The `meta` channel is deliberately generic: a future tool (a structured search, a data-table result) can attach its own durable result presentation without another core change.

docs/rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md

@@ -60,11 +60,11 @@ interface TerminalResultView { card: 'terminal'; title?: string; output?: string
 
 ## Non-goals
 
-- **Applied-hunk diffs.** `claude-agent-acp` additionally rewrites Write/Edit diffs at *result* time with real structured-patch hunks (via a PostToolUse hook: `toolUpdateFromDiffToolResponse`). Our diffs are call-time and args-derived (the whole `old_string`→`new_string`, no surrounding context lines), because `presentResult` sees only `{content, isError}` and `FsEditOutcome` carries a replacement count/version, not hunk text. Real hunks would need a new result/event shape carrying the patch — a follow-up, not this change. This is the one remaining representation difference from `claude-agent-acp`, and it is architectural (needs a new event), not cosmetic.
 - **Live incremental `terminal_output_delta` streaming** and **command classification** — the terminal-rendering RFC's own deferred follow-ups, untouched here.
 
 ## Related
 
 - Supersedes the deferral in [Collapse tool-owned UI presentation](../../rejected/simplification/2026-06-20-generic-tool-rendering.md) (rejected — "wait for two real tools and two real consumers, then a tagged render-intent union"). That bar is now met; this is that union.
+- Extended by [Result-time applied-hunk diffs](2026-07-02-result-time-applied-hunk-diffs.md), which adds a persisted `meta` channel so write/edit emit a result-time contextual-hunk `DiffResultView` (context lines + one hunk per `replace_all` site) on top of this union's call-time diff card.
 - Folds `ToolTerminal` into the `terminal` views described by [ACP terminal and tool-call rendering](../feature/2026-06-18-acp-terminal-and-tool-rendering.md) (the `_meta` terminal-card convention and capability gate are unchanged; only the harness-side presentation type changes).
 - The ACP SDK's `Diff` / `ToolCallContent` types back the new `diff` card.

examples/acp-agent/tests/snapshots/fs-edit/session.jsonl

@@ -1,147 +1,131 @@
-{"type":"session","version":0,"id":"2d43b6e7-859c-4e20-9145-3bcfe4c29836","createdAt":1782993777165,"cwd":"/tmp/acp-snap-cwd-yl8qhJ"}
-{"type":"turn/start","seq":0,"time":1782993777170,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1782993777170,"data":{"content":[{"type":"text","text":"First use the read tool to read config.txt in the current directory. Then use the edit tool (NOT bash) to replace the literal text DEBUG with RELEASE in that file. Then reply with exactly the single word DONE."}],"source":{"kind":"user"}},"surfaceOp":"append"}
-{"type":"step/start","seq":2,"time":1782993777171,"data":{"turn":1,"step":1}}
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+{"type":"assistant/message","seq":127,"time":1783069541069,"data":{"turn":1,"step":3,"content":[{"type":"reasoning","text":"The file has been updated. The user asked me to reply with exactly the single word DONE."},{"type":"text","text":"DONE"}],"usage":{"inputTokens":244,"outputTokens":23,"cacheReadTokens":2304,"reasoningTokens":20}},"sourceEventSeqs":[99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126],"surfaceOp":"append"}
+{"type":"step/end","seq":128,"time":1783069541070,"data":{"turn":1,"step":3}}
+{"type":"turn/end","seq":129,"time":1783069541070,"data":{"turn":1,"reason":{"kind":"completed"}}}

examples/acp-agent/tests/snapshots/fs-edit/stdout.golden.jsonl

@@ -9,27 +9,10 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" see"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" its"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" contents"}}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_Qm1fHx9Xd5wOv1WZvgmj2865","title":"Read config.txt","kind":"read","status":"in_progress","locations":[{"path":"config.txt","line":1}]}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_Qm1fHx9Xd5wOv1WZvgmj2865","status":"completed","content":[{"type":"content","content":{"type":"text","text":"<path>{{cwd}}/config.txt</path>\n<type>file</type>\n<content>\n1: mode=DEBUG\n2: level=info\n\n(End of file - total 2 lines)\n</content>"}}]}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"The"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" file"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" contains"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"mode"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"="}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"DEBUG"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\""}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" on"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" line"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" "}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"1"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Now"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_MkPefqOY8sRQIkux83391414","title":"Read config.txt","kind":"read","status":"in_progress","locations":[{"path":"config.txt","line":1}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_MkPefqOY8sRQIkux83391414","status":"completed","content":[{"type":"content","content":{"type":"text","text":"<path>{{cwd}}/config.txt</path>\n<type>file</type>\n<content>\n1: mode=DEBUG\n2: level=info\n\n(End of file - total 2 lines)\n</content>"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"Now"}}}}
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@@ -50,12 +33,13 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_OwPhDMqS06VEbY7rO4Rv1204","title":"Edit config.txt","kind":"edit","status":"in_progress","locations":[{"path":"config.txt"}],"content":[{"type":"diff","path":"config.txt","oldText":"DEBUG","newText":"RELEASE"}]}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_OwPhDMqS06VEbY7rO4Rv1204","status":"completed","content":[{"type":"content","content":{"type":"text","text":"The file {{cwd}}/config.txt has been updated successfully."}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_BwdjVI05cT0dvHSaziZp0350","title":"Edit config.txt","kind":"edit","status":"in_progress","locations":[{"path":"config.txt"}],"content":[{"type":"diff","path":"config.txt","oldText":"DEBUG","newText":"RELEASE"}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_BwdjVI05cT0dvHSaziZp0350","status":"completed","content":[{"type":"diff","path":"config.txt","oldText":"mode=DEBUG\nlevel=info","newText":"mode=RELEASE\nlevel=info"}],"title":"Edit config.txt"}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" edit"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" was"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" successful"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" file"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" has"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" been"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" updated"}}}}
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examples/acp-agent/tests/snapshots/fs-policy-reject/stdout.golden.jsonl

@@ -5,7 +5,6 @@
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@@ -24,21 +23,17 @@
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" exactly"}}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" word"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" D"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ONE"}}}}
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-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_3fuirRMnjFj7LWlJL1eU3690","status":"failed","content":[{"type":"content","content":{"type":"text","text":"Error: edit requires reading \"{{cwd}}/settings.txt\" first"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Let"}}}}
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+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_vCcG7c6T2vNO29dXgpkK5485","title":"Edit settings.txt","kind":"edit","status":"in_progress","locations":[{"path":"settings.txt"}],"content":[{"type":"diff","path":"settings.txt","oldText":"blue","newText":"green"}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_vCcG7c6T2vNO29dXgpkK5485","status":"failed","content":[{"type":"content","content":{"type":"text","text":"Error: edit requires reading \"{{cwd}}/settings.txt\" first"}}]}}}
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@@ -47,90 +42,280 @@
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examples/acp-agent/tests/snapshots/fs-read-window/session.jsonl

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examples/acp-agent/tests/snapshots/fs-terminal-card/stdout.golden.jsonl

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examples/acp-agent/tests/snapshots/fs-write-overwrite/session.jsonl

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@@ -38,34 +55,30 @@
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examples/acp-agent/tests/snapshots/fs-write/session.jsonl

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+{"type":"assistant/chunk","seq":74,"time":1783069535326,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" I"}}}
+{"type":"assistant/chunk","seq":75,"time":1783069535326,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" should"}}}
+{"type":"assistant/chunk","seq":76,"time":1783069535326,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" reply"}}}
+{"type":"assistant/chunk","seq":77,"time":1783069535326,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" with"}}}
+{"type":"assistant/chunk","seq":78,"time":1783069535359,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" exactly"}}}
+{"type":"assistant/chunk","seq":79,"time":1783069535360,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" \""}}}
+{"type":"assistant/chunk","seq":80,"time":1783069535360,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"D"}}}
+{"type":"assistant/chunk","seq":81,"time":1783069535360,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"ONE"}}}
+{"type":"assistant/chunk","seq":82,"time":1783069535360,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"\"."}}}
+{"type":"assistant/chunk","seq":83,"time":1783069535399,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":84,"time":1783069535399,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"D"}}}
+{"type":"assistant/chunk","seq":85,"time":1783069535399,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"ONE"}}}
+{"type":"assistant/chunk","seq":86,"time":1783069535399,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"File created successfully. Now I should reply with exactly \"DONE\"."}}}}
+{"type":"assistant/chunk","seq":87,"time":1783069535399,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"DONE"}}}}
+{"type":"assistant/chunk","seq":88,"time":1783069535400,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":256,"outputTokens":17,"cacheReadTokens":2176,"reasoningTokens":14}}}}
+{"type":"assistant/chunk","seq":89,"time":1783069535400,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":90,"time":1783069535400,"data":{"turn":1,"step":2,"content":[{"type":"reasoning","text":"File created successfully. Now I should reply with exactly \"DONE\"."},{"type":"text","text":"DONE"}],"usage":{"inputTokens":256,"outputTokens":17,"cacheReadTokens":2176,"reasoningTokens":14}},"sourceEventSeqs":[68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89],"surfaceOp":"append"}
+{"type":"step/end","seq":91,"time":1783069535400,"data":{"turn":1,"step":2}}
+{"type":"turn/end","seq":92,"time":1783069535400,"data":{"turn":1,"reason":{"kind":"completed"}}}

examples/acp-agent/tests/snapshots/fs-write/stdout.golden.jsonl

@@ -23,29 +23,28 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" write"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" tool"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":","}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" and"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" then"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" exactly"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" word"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"D"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ONE"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"."}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_OxAUP9dIc6I1B6Coo5vs8586","title":"Write notes.txt","kind":"edit","status":"in_progress","locations":[{"path":"notes.txt"}],"content":[{"type":"diff","path":"notes.txt","oldText":null,"newText":"hello world"}]}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_OxAUP9dIc6I1B6Coo5vs8586","status":"completed","content":[{"type":"content","content":{"type":"text","text":"<path>{{cwd}}/notes.txt</path>\n<type>file</type>\n<content>\nCreated file\n</content>"}}]}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"The"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" file"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" was"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_ICLusq2lV6YYBtn1szVM9454","title":"Write notes.txt","kind":"edit","status":"in_progress","locations":[{"path":"notes.txt"}],"content":[{"type":"diff","path":"notes.txt","oldText":null,"newText":"hello world"}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_ICLusq2lV6YYBtn1szVM9454","status":"completed","content":[{"type":"content","content":{"type":"text","text":"<path>{{cwd}}/notes.txt</path>\n<type>file</type>\n<content>\nCreated file\n</content>"}}]}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"File"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" created"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" successfully"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Now"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" I"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" just"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" need"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" should"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" exactly"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"D"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ONE"}}}}

packages/core/agent-loop/src/loop.ts

@@ -724,6 +724,9 @@ async function runStep(
       content: result.content,
       isError: result.isError,
       ...result.error ? { error: result.error } : {},
+      // The tool's private presentation payload (e.g. a result-time diff),
+      // persisted so a UI bridge reproduces the card on replay.
+      ...result.meta !== undefined ? { meta: result.meta } : {},
     }, { surfaceOp: 'append', sourceEventSeqs: [callEvent.seq] })
     // signal CAN flip during the await above (abort() inside a tool);
     // the analyzer can't see through the await boundary.

packages/core/agent-loop/tests/loop.spec.ts

@@ -110,6 +110,32 @@ describe('agent loop', () => {
     expect(types).toContain('tool/result')
   })
 
+  it('threads a tool-attached meta (execute object return) onto the tool/result event', async () => {
+    const adapter = new MockAdapter([
+      toolCallResponse('c1', 'writer', { path: 'a.txt' }, 'writing'),
+      textResponse('done'),
+    ])
+    const ctx = await harness(adapter)
+    // A tool that returns the { content, meta } object form: the loop must
+    // persist `meta` on the tool/result event so a UI reproduces the card on replay.
+    ctx.tools.register(defineTool({
+      name: 'writer',
+      description: 'writes a file',
+      parameters: { path: { type: 'string' } },
+      async execute() {
+        return { content: [{ type: 'text', text: 'ok' }], meta: { diffs: [{ path: 'a.txt', oldText: null, newText: 'x' }] } }
+      },
+    }))
+    const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
+
+    send(agent, 'use the tool')
+    await waitForIdle(ctx, agent)
+
+    const toolResult = agent.session.events.find(e => e.type === 'tool/result')
+    expect(toolResult?.type === 'tool/result' && toolResult.data.meta)
+      .toEqual({ diffs: [{ path: 'a.txt', oldText: null, newText: 'x' }] })
+  })
+
   it('passes assembled system prompt and tool schemas into the request', async () => {
     const adapter = new MockAdapter([textResponse('ok')])
     const ctx = await harness(adapter)

packages/core/session/src/index.ts

@@ -16,6 +16,7 @@ import { SurfaceManager, isSurfaceEligibleType } from './surface.ts'
 
 export * from './types.ts'
 export { isJsonValue } from './json.ts'
+export type { JsonValue } from './json.ts'
 export { interruptedTurnClosers } from './repair.ts'
 export type { SurfaceNode } from './surface.ts'
 export { isSurfaceEvent, isSurfaceEligibleType } from './surface.ts'

packages/core/session/src/json.ts

@@ -13,6 +13,16 @@
  * @module @deepseek-ai/dsh-session/json
  */
 
+/**
+ * A value that round-trips losslessly through JSON: `null`, a boolean, a finite
+ * number, a string, an array of such values, or a plain object whose values are
+ * such values. The static type companion to {@link isJsonValue} (which validates
+ * the same shape at runtime). Use it to type a payload that must survive
+ * session-log persistence and replay byte-identically — e.g. a tool's private
+ * presentation `meta`.
+ */
+export type JsonValue = null | boolean | number | string | JsonValue[] | { [key: string]: JsonValue }
+
 /**
  * Whether `value` is losslessly JSON-serializable: only `null`, finite numbers,
  * booleans, strings, plain arrays, and plain objects of such values. Rejects

packages/core/session/src/types.ts

@@ -1,5 +1,6 @@
 import type { Branded } from '@deepseek-ai/dsh-brand'
 import type { CallId, ContentBlock, MessageSource, StreamChunk, TokenUsage } from '@deepseek-ai/dsh-llm'
+import type { JsonValue } from './json.ts'
 
 /** Identifies one session in the store (and its persistence artifacts). */
 export type SessionId = Branded<'SessionId'>
@@ -210,7 +211,16 @@ export interface SessionEventMap {
    */
   'assistant/message': { turn: number; step: number; content: ContentBlock[]; usage?: TokenUsage }
   'tool/call': { turn: number; step: number; callId: CallId; name: string; arguments: string }
-  'tool/result': { turn: number; step: number; callId: CallId; content: ContentBlock[]; isError: boolean; error?: { name: string; code: string } }
+  /**
+   * A completed tool call's model-facing result, plus an optional tool-private
+   * `meta` presentation payload. `meta` is opaque to the core — the producing
+   * tool owns its shape and reads it back in `presentResult` — and is a
+   * {@link JsonValue} so it persists in the durable log and reproduces on replay
+   * (a UI bridge renders the identical card from a loaded session). Absent unless
+   * the tool attaches one (e.g. `dsh-tool-fs` carries its result-time contextual
+   * diff here).
+   */
+  'tool/result': { turn: number; step: number; callId: CallId; content: ContentBlock[]; isError: boolean; error?: { name: string; code: string }; meta?: JsonValue }
   /** Steering content injected between steps of a running turn. */
   'steering/message': { turn: number; content: ContentBlock[]; source: MessageSource }
   /**

packages/core/tools/README.md

@@ -24,7 +24,7 @@ Tool registry and execution waterfall. Tool plugins register their schemas and e
 
 ### Key types
 
-- `ToolDefinition` — `ToolSchema` + `execute(args, exec): Promise<ContentBlock[]>`, plus optional `presentCall(args)` / `presentResult(args, result)` for tool-owned UI presentation (see below).
+- `ToolDefinition` — `ToolSchema` + `execute(args, exec): Promise<ContentBlock[] | { content: ContentBlock[]; meta? }>` (the bare array is the model-facing content; the object form additionally attaches an opaque, JSON-serializable `meta` presentation payload persisted on the `tool/result` event and handed back to `presentResult`), plus optional `presentCall(args)` / `presentResult(args, result)` for tool-owned UI presentation (see below).
 - `ToolExecution` — one pending tool call: `{ callId, name, arguments, agent?, signal? }`.
 - `ToolExecutionResult` — outcome: `{ callId, content, isError, error? }`. On failure with a `HarnessError`, `error: { name, code }` carries the structured failure class alongside the model-facing text (the loop forwards it onto the `tool/result` session event for retry/sandbox plugins and replay).
 - `ToolCallView` / `ToolResultView` — provider-neutral `card`-tagged render intents a tool returns from `presentCall` / `presentResult` to own how a UI renders ITS calls (see "Tool-owned UI presentation").
@@ -76,11 +76,12 @@ A tool owns how ITS calls render in a UI (an editor's tool-call card, a CLI log
   - `{ card: 'generic', title, kind?, rawInput?, content?, locations? }` — the default card: a human-readable `title`, an optional `kind` (`read`/`edit`/`execute`/… for icon/treatment, default `other`), an optional `rawInput` (the salient input to show in a detail view — e.g. a background task id, NOT the whole args object), optional `content` (extra UI content blocks), and optional `locations` (`{ path, line? }[]` — files this call reads/modifies, so a capable UI can follow along; the ACP bridge forwards them as `tool_call.locations`).
   - `{ card: 'terminal', title, description?, cwd? }` — a shell command: a capable UI renders a terminal card (the `title` is the command, `description` renders above it, `cwd` heads it); an incapable UI falls back to a generic execute card.
   - `{ card: 'diff', title, diffs, locations? }` — a file create/modify: a capable UI renders an inline diff card from `diffs` (`{ path, oldText, newText }[]`; `oldText: null` for a new file). Used by `write`/`edit`.
-- `presentResult(args, result): ToolResultView | undefined` — the COMPLETED state, given the same `args` and the `{ content, isError }` result, one of:
+- `presentResult(args, result): ToolResultView | undefined` — the COMPLETED state, given the same `args` and the `{ content, isError, meta? }` result, one of:
   - `{ card: 'generic', title?, content? }` — an optional replacement `title` and reformatted `content`.
   - `{ card: 'terminal', title?, output?, exitCode?, signal? }` — a terminal run's captured `output` and exit status. A capable UI shows an exit-status pill; an incapable UI gets a fenced ` ```console ` fallback the BRIDGE derives from `output` (the tool does not encode the fences).
+  - `{ card: 'diff', title?, diffs }` — a completed file mutation as an inline diff. `diffs` is `FileDiff[]` — the APPLIED hunks with surrounding context (one entry per changed site), computed from the before/after file content, distinct from the call-time whole-snippet `diff`. Used by `write`/`edit`; a `tool_call_update.content` replaces the call's content, so this supersedes the pending snippet.
 
-Returning `undefined` (or omitting a method) tells a UI to fall back to a generic presentation (title = tool name, raw args as input, raw result content). Both methods must be **pure and side-effect-free**: a UI may call them during live streaming AND during a session-log replay, so they depend only on their arguments. With `defineTool`, `args` is the typed `InferArgs<S>` shape; the helper soft-validates before calling (a malformed/older logged arg shape yields `undefined` rather than throwing, since display must never crash a replay). The views are provider-neutral — the ACP bridge (`dsh-acp`) maps each `card` to ACP `tool_call`/`tool_call_update` wire fields (a `diff` card to a `{ type: 'diff' }` content block, a `terminal` card to the `_meta` terminal convention), and relativizes a file card's title against the session cwd. See the render-intent-union RFC (`docs/rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md`); `dsh-tool-bash` (terminal) and `dsh-tool-fs` (diff/generic) are the reference implementations.
+Returning `undefined` (or omitting a method) tells a UI to fall back to a generic presentation (title = tool name, raw args as input, raw result content). Both methods must be **pure and side-effect-free**: a UI may call them during live streaming AND during a session-log replay, so they depend only on their arguments. `result.meta` is the tool's own optional presentation payload (`JsonValue`), attached by `execute` (see below) and persisted on the `tool/result` event, so a `presentResult` reading it stays replay-deterministic (the same `meta` is read back from the log). With `defineTool`, `args` is the typed `InferArgs<S>` shape; the helper soft-validates before calling (a malformed/older logged arg shape yields `undefined` rather than throwing, since display must never crash a replay). The views are provider-neutral — the ACP bridge (`dsh-acp`) maps each `card` to ACP `tool_call`/`tool_call_update` wire fields (a `diff` card to a `{ type: 'diff' }` content block, a `terminal` card to the `_meta` terminal convention), and relativizes a file card's title against the session cwd. See the render-intent-union RFC (`docs/rfc/implemented/architecture/2026-07-02-tool-render-intent-union.md`) and the applied-hunk-diffs RFC (`docs/rfc/implemented/architecture/2026-07-02-result-time-applied-hunk-diffs.md`); `dsh-tool-bash` (terminal) and `dsh-tool-fs` (diff/generic) are the reference implementations.
 
 ```ts
 import { defineTool } from '@deepseek-ai/dsh-tools'

packages/core/tools/package.json

@@ -24,12 +24,14 @@
   "peerDependencies": {
     "@deepseek-ai/dsh-agent": "^0.0.1",
     "@deepseek-ai/dsh-llm": "^0.0.1",
+    "@deepseek-ai/dsh-session": "^0.0.1",
     "@deepseek-ai/dsh-system-prompt": "^0.0.1",
     "cordis": "^4.0.0-rc.6"
   },
   "devDependencies": {
     "@deepseek-ai/dsh-agent": "workspace:^",
     "@deepseek-ai/dsh-llm": "workspace:^",
+    "@deepseek-ai/dsh-session": "workspace:^",
     "@deepseek-ai/dsh-system-prompt": "workspace:^",
     "cordis": "^4.0.0-rc.6"
   }

packages/core/tools/src/index.ts

@@ -11,6 +11,7 @@ import { Context, Service } from 'cordis'
 import type { CallId, ContentBlock, ToolSchema } from '@deepseek-ai/dsh-llm'
 import { HarnessError } from '@deepseek-ai/dsh-llm'
 import type { Agent } from '@deepseek-ai/dsh-agent'
+import type { JsonValue } from '@deepseek-ai/dsh-session'
 import type {} from '@deepseek-ai/dsh-system-prompt'
 
 export {
@@ -87,6 +88,13 @@ export interface FileDiff {
   oldText: string | null
   /** Content after the change. */
   newText: string
+  /**
+   * Index signature so a `FileDiff` is a valid {@link JsonValue} member — a tool
+   * persists result-time diffs as `tool/result` `meta`, which must round-trip
+   * through the session log. Every declared field is already JSON-compatible;
+   * this only makes the structural compatibility explicit.
+   */
+  [key: string]: string | null
 }
 
 /**
@@ -159,7 +167,8 @@ export interface TerminalCallView {
  * A call that creates or modifies files, rendered as an inline diff card by a
  * capable UI. Set by a tool whose call writes/edits a file (e.g. `write`,
  * `edit`). The diffs are derived from the call ARGUMENTS (a create's `oldText` is
- * `null`); result-time applied-hunk diffs are a separate follow-up.
+ * `null`); the result-time applied-hunk diff (with context) is a separate
+ * {@link DiffResultView} the tool emits after `execute`.
  */
 export interface DiffCallView {
   card: 'diff'
@@ -179,7 +188,7 @@ export interface DiffCallView {
  * {@link ToolDefinition.presentResult}; omitting the method keeps the pending
  * title and renders the raw result content.
  */
-export type ToolResultView = GenericResultView | TerminalResultView
+export type ToolResultView = GenericResultView | TerminalResultView | DiffResultView
 
 /**
  * The default completed card: an optional replacement title and reformatted
@@ -217,9 +226,37 @@ export interface TerminalResultView {
   signal?: string
 }
 
+/**
+ * A completed file mutation rendered as an inline diff card, the *result-time*
+ * analogue of {@link DiffCallView}. Set by a tool whose `execute` applied a
+ * file change (e.g. `write`, `edit`): `diffs` are the APPLIED hunks computed
+ * from the before/after file content (one entry per hunk, each with surrounding
+ * context lines), so the editor shows the real change with context — distinct
+ * from the call-time whole-snippet {@link DiffCallView}. A `tool_call_update`'s
+ * content REPLACES the call's content in an editor, so this result diff
+ * supersedes the pending snippet.
+ */
+export interface DiffResultView {
+  card: 'diff'
+  /** Replacement title for the completed call. Omit to keep the pending-state title. */
+  title?: string
+  /** One entry per applied hunk (a contextual diff), in file order. */
+  diffs: FileDiff[]
+}
+
+/**
+ * What a tool's `execute` returns. The bare {@link ContentBlock}`[]` form is the
+ * common case (model-facing content only); the object form additionally attaches
+ * a tool-private `meta` presentation payload ({@link JsonValue}) that the
+ * registry threads onto the `tool/result` session event and hands back to the
+ * tool's `presentResult`. `meta` is opaque to the core — the tool owns its shape
+ * and validates it on the way out — and persists so replay reproduces the card.
+ */
+export type ToolExecuteReturn = ContentBlock[] | { content: ContentBlock[]; meta?: JsonValue }
+
 /** A registered tool: its schema plus the execution function. */
 export interface ToolDefinition extends ToolSchema {
-  execute(args: unknown, exec: ToolExecution): Promise<ContentBlock[]>
+  execute(args: unknown, exec: ToolExecution): Promise<ToolExecuteReturn>
   /**
    * Optional: how to present the PENDING state of one call in a UI, derived from
    * the call's `args` (parsed arguments, `unknown` — the tool validates/narrows
@@ -246,6 +283,13 @@ export interface ToolResult {
   content: ContentBlock[]
   /** Whether the call failed. */
   isError: boolean
+  /**
+   * The tool-private presentation payload the tool attached from `execute` (via
+   * the object return form), threaded verbatim from the `tool/result` event.
+   * Opaque {@link JsonValue}; the tool narrows it back to its own shape. Absent
+   * when the tool attached none.
+   */
+  meta?: JsonValue
 }
 
 /** One pending tool call, as it flows through the execution waterfall. */
@@ -289,6 +333,13 @@ export interface ToolExecutionResult {
    * text in `content` is always present; this is extra structure for code.
    */
   error?: ToolErrorInfo
+  /**
+   * The tool-private presentation payload from a successful `execute` (the object
+   * return form). Threaded onto the `tool/result` session event and back into
+   * {@link ToolResult} for `presentResult`. Opaque {@link JsonValue}; absent when
+   * the tool attached none or the call failed.
+   */
+  meta?: JsonValue
 }
 
 /**
@@ -393,8 +444,13 @@ export class ToolRegistry extends Service {
           // Unknown tool routes through the same catch as a tool-thrown error, so
           // both failure classes get structured `{ name, code }` from one path.
           if (!tool) throw new ToolNotFoundError(exec.name)
-          const content = await tool.execute(exec.arguments, exec)
-          return { callId: exec.callId, content, isError: false }
+          // Normalize the two `execute` return shapes: a bare ContentBlock[] (no
+          // meta) or a { content, meta } object (a tool attaching a private
+          // presentation payload). An array IS the content; the object carries it.
+          const returned = await tool.execute(exec.arguments, exec)
+          const content = Array.isArray(returned) ? returned : returned.content
+          const meta = Array.isArray(returned) ? undefined : returned.meta
+          return { callId: exec.callId, content, isError: false, ...meta !== undefined ? { meta } : {} }
         } catch (error: unknown) {
           return toolErrorResult(exec.callId, error)
         }

packages/core/tools/src/schema.ts

@@ -19,9 +19,8 @@
  * @module dsh-tools/schema
  */
 
-import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import { assertNever, HarnessError } from '@deepseek-ai/dsh-llm'
-import type { ToolCallView, ToolDefinition, ToolExecution, ToolResult, ToolResultView } from './index.ts'
+import type { ToolCallView, ToolDefinition, ToolExecuteReturn, ToolExecution, ToolResult, ToolResultView } from './index.ts'
 
 // ---------------------------------------------------------------------------
 // SchemaSpec — the author-facing per-property type
@@ -291,9 +290,11 @@ export interface DefineToolOptions<S extends SchemaSpec> {
   parameters: S
   /**
    * Tool execution function. `args` is typed as {@link InferArgs<S>} — zero
-   * casts needed.
+   * casts needed. Returns either a bare {@link ContentBlock}`[]` (model-facing
+   * content only) or a `{ content, meta }` object to also attach a tool-private
+   * presentation payload (see {@link ToolExecuteReturn}).
    */
-  execute(args: InferArgs<S>, exec: ToolExecution): Promise<ContentBlock[]>
+  execute(args: InferArgs<S>, exec: ToolExecution): Promise<ToolExecuteReturn>
   /**
    * Optional: how to present the PENDING state of one call in a UI (an editor
    * tool-call card, a CLI log line). `args` is the typed, schema-validated
@@ -354,7 +355,7 @@ export function defineTool<S extends SchemaSpec>(options: DefineToolOptions<S>):
     description: options.description,
     parameters: schemaSpecToJsonSchema(options.parameters) as unknown as Record<string, unknown>,
     ...options.strict !== undefined ? { strict: options.strict } : {},
-    async execute(args: unknown, exec: ToolExecution): Promise<ContentBlock[]> {
+    async execute(args: unknown, exec: ToolExecution): Promise<ToolExecuteReturn> {
       // Validate the model-generated args before the typed body runs. On
       // mismatch we throw ToolArgsError; the registry turns it into an
       // isError result so the model can self-correct. After this guard, the

packages/core/tools/tests/tools.spec.ts

@@ -81,6 +81,38 @@ describe('ToolRegistry', () => {
     expect(result).toEqual({ callId: CallId('c1'), content: [{ type: 'text', text: 'hi' }], isError: false })
   })
 
+  it('threads a tool-attached meta (object return form) onto the result', async () => {
+    const ctx = await setup()
+    ctx.tools.register({
+      ...echoTool,
+      name: 'meta-tool',
+      async execute() {
+        return { content: [{ type: 'text', text: 'ok' }], meta: { diffs: [{ path: 'a', oldText: null, newText: 'x' }] } }
+      },
+    })
+    const result = await ctx.tools.execute({ callId: CallId('c1'), name: 'meta-tool', arguments: {} })
+    expect(result).toEqual({
+      callId: CallId('c1'),
+      content: [{ type: 'text', text: 'ok' }],
+      isError: false,
+      meta: { diffs: [{ path: 'a', oldText: null, newText: 'x' }] },
+    })
+  })
+
+  it('omits meta when the object return form supplies none', async () => {
+    const ctx = await setup()
+    ctx.tools.register({
+      ...echoTool,
+      name: 'no-meta-tool',
+      async execute() {
+        return { content: [{ type: 'text', text: 'ok' }] }
+      },
+    })
+    const result = await ctx.tools.execute({ callId: CallId('c1'), name: 'no-meta-tool', arguments: {} })
+    expect(result).toEqual({ callId: CallId('c1'), content: [{ type: 'text', text: 'ok' }], isError: false })
+    expect('meta' in result).toBe(false)
+  })
+
   it('returns isError results for unknown tools and throwing tools', async () => {
     const ctx = await setup()
     ctx.tools.register({

packages/fs/fs-local/src/fsio.ts

@@ -382,6 +382,25 @@ export async function readForEdit(
   return { content: normalizeLineEndings(raw), lineEndings: detectLineEndings(raw) }
 }
 
+/**
+ * Best-effort read of a file's current text for a before/after diff basis, used
+ * by an overwrite. Returns the LF-normalized decoded content, or `null` when the
+ * file is binary or not valid UTF-8 — a write must succeed regardless of the
+ * prior bytes, so an undiffable prior file simply yields no contextual diff
+ * (the caller treats `null` the same as an absent file: call-time card only).
+ */
+export async function readTextForDiff(absolutePath: string, signal?: AbortSignal): Promise<string | null> {
+  const buffer = await readFileAbortable(absolutePath, 'read', signal)
+  if (buffer.includes(0)) return null
+  try {
+    return normalizeLineEndings(new TextDecoder('utf-8', { fatal: true }).decode(buffer))
+  } catch (error: unknown) {
+    /* v8 ignore next 2 -- TextDecoder({fatal}) only throws TypeError on invalid bytes; any other throw is an unreachable runtime fault. */
+    if (!(error instanceof TypeError)) throw error
+    return null
+  }
+}
+
 /**
  * Apply a literal replacement to LF-normalized content. Throws
  * `FS_EDIT_NOT_FOUND` on empty `oldString` or zero matches and

packages/fs/fs-local/src/index.ts

@@ -28,6 +28,7 @@ import {
   applyLiteralEdit,
   probe,
   readForEdit,
+  readTextForDiff,
   readWholeText,
   resolveLocalTarget,
   restoreLineEndings,
@@ -41,6 +42,7 @@ export {
   applyLiteralEdit,
   probe,
   readForEdit,
+  readTextForDiff,
   readWholeText,
   resolveLocalTarget,
   restoreLineEndings,
@@ -143,11 +145,18 @@ export class LocalFileSystem extends FileSystem {
       // provider) — no version guard, no read-first requirement. Still atomic
       // (the per-target lock is unconditional), so the write is never torn.
 
+      // Capture the prior text (the before/after diff basis) BEFORE the write.
+      // `null` for a create (no existing file) OR an existing-but-undiffable
+      // file (binary/invalid-UTF-8) — a consumer renders no result-time diff for
+      // either, only the call-time whole-file card.
+      const before = existing ? await readTextForDiff(target.targetKey, signal) : null
       await writeFileAtomic(target.targetKey, content, existing?.mode, signal, this.internals)
       const after = await probe(target.targetKey)
       return {
         operation: existing ? 'update' : 'create',
         version: this.versionAfterWrite(after, target),
+        before,
+        after: content,
       }
     })
   }
@@ -183,6 +192,10 @@ export class LocalFileSystem extends FileSystem {
         replacements: edited.replacements,
         replaceAll: edit.replaceAll,
         version: this.versionAfterWrite(after, target),
+        // The LF-normalized before/after text (the applied-hunk diff basis);
+        // line-ending restoration is a storage detail the diff ignores.
+        before: original.content,
+        after: edited.content,
       }
     })
   }

packages/fs/fs-local/tests/filesystem.spec.ts

@@ -188,6 +188,49 @@ describe('writeText', () => {
     await expect(fs.writeText(target, 'x')).rejects.toMatchObject({ code: 'FS_NOT_REGULAR_FILE' })
   })
 
+  it('a create reports before:null and after = the written content (no prior file)', async () => {
+    const target = await fs.resolve('new.txt')
+    const outcome = await fs.writeText(target, 'fresh')
+    expect(outcome.before).toBeNull()
+    expect(outcome.after).toBe('fresh')
+  })
+
+  it('an overwrite reports before = the OLD content and after = the new content', async () => {
+    await writeFile(join(dir, 'a.txt'), 'old body')
+    const target = await fs.resolve('a.txt')
+    const outcome = await fs.writeText(target, 'new body')
+    expect(outcome.before).toBe('old body')
+    expect(outcome.after).toBe('new body')
+  })
+
+  it('an overwrite of a CRLF file returns LF-normalized before content', async () => {
+    await writeFile(join(dir, 'a.txt'), 'a\r\nb\r\n')
+    const target = await fs.resolve('a.txt')
+    const outcome = await fs.writeText(target, 'a\nB\n')
+    expect(outcome.before).toBe('a\nb\n')
+  })
+
+  it('an overwrite of a BINARY prior file reports before:null (undiffable), still succeeds', async () => {
+    await writeFile(join(dir, 'a.bin'), Buffer.from([0x00, 0x01, 0x02]))
+    const target = await fs.resolve('a.bin')
+    const outcome = await fs.writeText(target, 'now text')
+    expect(outcome.operation).toBe('update')
+    expect(outcome.before).toBeNull()
+    expect(outcome.after).toBe('now text')
+  })
+
+  it('an overwrite of an INVALID-UTF-8 (non-NUL) prior file reports before:null, still succeeds', async () => {
+    // 0xff is never valid UTF-8 but is not a NUL, so it exercises the decoder's
+    // fatal-throw path (not the NUL-scan short-circuit): an undiffable prior file
+    // still yields a successful write with no before-content basis.
+    await writeFile(join(dir, 'a.bin'), Buffer.from([0x68, 0xff, 0x69]))
+    const target = await fs.resolve('a.bin')
+    const outcome = await fs.writeText(target, 'now valid')
+    expect(outcome.operation).toBe('update')
+    expect(outcome.before).toBeNull()
+    expect(outcome.after).toBe('now valid')
+  })
+
   it('releases per-target mutation locks after success and failure', async () => {
     const target = await fs.resolve('a.txt')
     await fs.writeText(target, 'created', { kind: 'createIfAbsent' })
@@ -242,6 +285,17 @@ describe('editText', () => {
     expect(await readFile(join(dir, 'a.txt'), 'utf8')).toBe('hello there')
   })
 
+  it('reports before/after content (the applied-hunk basis), LF-normalized', async () => {
+    await writeFile(join(dir, 'a.txt'), 'a\r\nOLD\r\nb\r\n')
+    const target = await fs.resolve('a.txt')
+    const outcome = await fs.editText(target, { oldString: 'OLD', newString: 'NEW', replaceAll: false })
+    expect(outcome.before).toBe('a\nOLD\nb\n')
+    expect(outcome.after).toBe('a\nNEW\nb\n')
+    // The written file keeps the original CRLF endings (before/after are the
+    // LF-normalized diff basis, not the on-disk bytes).
+    expect(await readFile(join(dir, 'a.txt'), 'utf8')).toBe('a\r\nNEW\r\nb\r\n')
+  })
+
   it('checks the stale version BEFORE literal matching', async () => {
     await writeFile(join(dir, 'a.txt'), 'hello world')
     const target = await fs.resolve('a.txt')

packages/fs/fs/src/types.ts

@@ -101,6 +101,14 @@ export interface FsWriteOutcome {
   operation: 'create' | 'update'
   /** Opaque version of the file after the write. */
   version: FsVersion
+  /**
+   * The file's content BEFORE the write, or `null` when the file did not exist
+   * (a create). Raw storage text (LF-normalized by the backend), never a diff —
+   * a consumer computes the result-time contextual diff from `before`/`after`.
+   */
+  before: string | null
+  /** The file's content AFTER the write (the text that was written). */
+  after: string
 }
 
 /** A literal-replacement edit request. */
@@ -121,6 +129,14 @@ export interface FsEditOutcome {
   replaceAll: boolean
   /** Opaque version of the file after the edit. */
   version: FsVersion
+  /**
+   * The file's content BEFORE the edit. Raw storage text (LF-normalized by the
+   * backend), never a diff — a consumer computes the result-time contextual diff
+   * (the applied hunk with context) from `before`/`after`.
+   */
+  before: string
+  /** The file's content AFTER the edit. */
+  after: string
 }
 
 /**

packages/fs/fs/tests/service.spec.ts

@@ -39,14 +39,15 @@ class FakeFileSystem extends FileSystem {
     return (async function* () { yield content })()
   }
   override async writeText(target: FsTarget, content: string, _expected?: FsWriteIntent): Promise<FsWriteOutcome> {
-    const existed = this.files.has(target.targetKey)
+    const before = this.files.get(target.targetKey) ?? null
     this.files.set(target.targetKey, content)
-    return { operation: existed ? 'update' : 'create', version: FsVersion('v2') }
+    return { operation: before !== null ? 'update' : 'create', version: FsVersion('v2'), before, after: content }
   }
   override async editText(target: FsTarget, edit: FsEditRequest): Promise<FsEditOutcome> {
     const content = this.files.get(target.targetKey) ?? ''
-    this.files.set(target.targetKey, content.split(edit.oldString).join(edit.newString))
-    return { replacements: 1, replaceAll: edit.replaceAll, version: FsVersion('v3') }
+    const after = content.split(edit.oldString).join(edit.newString)
+    this.files.set(target.targetKey, after)
+    return { replacements: 1, replaceAll: edit.replaceAll, version: FsVersion('v3'), before: content, after }
   }
 }
 

packages/fs/tool-fs/package.json

@@ -21,9 +21,13 @@
     "src"
   ],
   "license": "BSD-3-Clause",
+  "dependencies": {
+    "diff": "^9.0.0"
+  },
   "peerDependencies": {
     "@deepseek-ai/dsh-fs": "^0.0.1",
     "@deepseek-ai/dsh-llm": "^0.0.1",
+    "@deepseek-ai/dsh-session": "^0.0.1",
     "@deepseek-ai/dsh-system-prompt": "^0.0.1",
     "@deepseek-ai/dsh-tools": "^0.0.1",
     "cordis": "^4.0.0-rc.6"

packages/fs/tool-fs/src/diff.ts

@@ -0,0 +1,92 @@
+/**
+ * Result-time contextual-diff computation for the `write`/`edit` tools. Turns a
+ * before/after pair of file texts into one {@link FileDiff} per applied hunk —
+ * each hunk's `oldText`/`newText` reconstructed from the unified-diff lines with
+ * ±{@link DIFF_CONTEXT} surrounding context lines, matching how claude-agent-acp
+ * renders an editor inline diff.
+ *
+ * This is display-only presentation vocabulary (a UI concern), so it lives in
+ * the model-facing tool, NOT the `dsh-fs` storage seam — the backend returns
+ * only the raw before/after text (storage facts) and the tool computes the diff.
+ *
+ * @module @deepseek-ai/dsh-tool-fs/src/diff
+ */
+
+import { structuredPatch } from 'diff'
+import type { FileDiff } from '@deepseek-ai/dsh-tools'
+import type { JsonValue } from '@deepseek-ai/dsh-session'
+
+/** Context lines shown on each side of an applied hunk (matches claude-agent-acp). */
+export const DIFF_CONTEXT = 3
+
+/**
+ * The `write`/`edit` tools' private `tool/result` `meta` payload: the applied
+ * contextual-diff hunks. A {@link JsonValue} (persisted with the session log, so
+ * `presentResult` reproduces the diff card on replay). The producing tool owns
+ * this shape; the bridge only sees the opaque `meta` and the tool narrows it back
+ * via {@link diffsFromMeta}.
+ */
+export type FsDiffMeta = { diffs: FileDiff[] }
+
+/**
+ * Compute one {@link FileDiff} per hunk between `before` and `after`, each
+ * carrying the applied change plus {@link DIFF_CONTEXT} context lines. Returns an
+ * empty array when the texts are identical (no hunks). For a scattered
+ * `replace_all` edit the patch yields multiple hunks, so multiple `FileDiff`s
+ * come back — matching the editor rendering one diff block per site.
+ *
+ * Each hunk's `oldText` is its `-` (removed) and context lines joined by `\n`;
+ * `newText` is its `+` (added) and context lines. A hunk with no old lines
+ * (a pure insertion) reports `oldText: null` (nothing to diff against), mirroring
+ * the call-time card's new-file convention. The unified-diff "\ No newline at end
+ * of file" markers are dropped — they annotate the patch, not file content.
+ */
+export function computeHunkDiffs(path: string, before: string, after: string): FileDiff[] {
+  const patch = structuredPatch('', '', before, after, undefined, undefined, { context: DIFF_CONTEXT })
+  const diffs: FileDiff[] = []
+  for (const hunk of patch.hunks) {
+    const oldLines: string[] = []
+    const newLines: string[] = []
+    for (const line of hunk.lines) {
+      // The unified-diff marker for a missing trailing newline annotates the
+      // patch, not the content — skip it so it never leaks into a diff block.
+      if (line.startsWith('\\')) continue
+      const text = line.slice(1)
+      if (line.startsWith('-')) {
+        oldLines.push(text)
+      } else if (line.startsWith('+')) {
+        newLines.push(text)
+      } else {
+        // A context (unchanged) line appears on both sides.
+        oldLines.push(text)
+        newLines.push(text)
+      }
+    }
+    diffs.push({ path, oldText: oldLines.length > 0 ? oldLines.join('\n') : null, newText: newLines.join('\n') })
+  }
+  return diffs
+}
+
+/** Whether `value` is a valid {@link FileDiff} (defensive narrowing from opaque `meta`). */
+function isFileDiff(value: JsonValue): value is FileDiff & JsonValue {
+  if (typeof value !== 'object' || value === null || Array.isArray(value)) return false
+  const { path, oldText, newText } = value
+  return typeof path === 'string'
+    && (oldText === null || typeof oldText === 'string')
+    && typeof newText === 'string'
+}
+
+/**
+ * Narrow an opaque `tool/result` `meta` back to this tool's {@link FileDiff}
+ * hunks, or `undefined` when it is absent/malformed. `presentResult` runs on
+ * arbitrary logged `meta` (possibly from an older shape or a hand-edited log), so
+ * it validates defensively rather than trusting the payload — a bad `meta` yields
+ * no diff card (the generic result rendering) instead of a thrown presenter.
+ */
+export function diffsFromMeta(meta: JsonValue | undefined): FileDiff[] | undefined {
+  if (typeof meta !== 'object' || meta === null || Array.isArray(meta)) return undefined
+  const diffs = meta.diffs
+  if (!Array.isArray(diffs) || diffs.length === 0 || !diffs.every(isFileDiff)) return undefined
+  return diffs
+}
+

packages/fs/tool-fs/src/edit.ts

@@ -14,11 +14,12 @@
 
 import type { Context } from 'cordis'
 import { defineTool } from '@deepseek-ai/dsh-tools'
-import type { DiffCallView } from '@deepseek-ai/dsh-tools'
+import type { DiffCallView, DiffResultView, ToolResult } from '@deepseek-ai/dsh-tools'
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import type { FsEditOutcome } from '@deepseek-ai/dsh-fs'
 import type {} from '@deepseek-ai/dsh-fs'
 import type {} from '@deepseek-ai/dsh-system-prompt'
+import { computeHunkDiffs, diffsFromMeta, type FsDiffMeta } from './diff.ts'
 import { sessionCwd } from './session-cwd.ts'
 
 /** Validated `edit` arguments after defaulting. */
@@ -66,7 +67,7 @@ export function applyEditTool(ctx: Context): void {
       new_string: { type: 'string', required: true, description: 'Literal replacement text. Use an empty string to delete the match.' },
       replace_all: { type: 'boolean', description: 'Replace all matches. Defaults to false; when false, old_string must appear exactly once.' },
     },
-    async execute(args, exec): Promise<ContentBlock[]> {
+    async execute(args, exec): Promise<{ content: ContentBlock[]; meta?: FsDiffMeta }> {
       const input = parseEditArgs(args)
       const cwd = sessionCwd(exec)
       const target = await ctx.fs.resolve(input.filePath, cwd !== undefined ? { cwd } : undefined)
@@ -82,7 +83,17 @@ export function applyEditTool(ctx: Context): void {
       )
       // Record the observed version (a no-op when no policy plugin listens).
       ctx.emit('fs/observed', target, outcome.version, exec)
-      return [{ type: 'text', text: formatEditOutput(target.displayPath, outcome) }]
+      // The result-time applied-hunk diff (before→after with context lines). An
+      // edit always changes content (parseEditArgs requires old_string to differ
+      // and editText matches at least once), so there is always at least one hunk.
+      // The bridge renders these as an inline diff that supersedes the call-time
+      // snippet; the display path is the model-facing `file_path` (the bridge
+      // relativizes it).
+      const diffs = computeHunkDiffs(input.filePath, outcome.before, outcome.after)
+      return {
+        content: [{ type: 'text', text: formatEditOutput(target.displayPath, outcome) }],
+        meta: { diffs },
+      }
     },
     // Pure display: a diff card of the literal replacement (old_string →
     // new_string), derived from the call args. `oldText: old_string || null`
@@ -96,5 +107,15 @@ export function applyEditTool(ctx: Context): void {
         locations: [{ path: args.file_path }],
       }
     },
+    // Result-time display: the applied contextual-diff hunks carried on `meta`.
+    // On success with diffs, a `diff` result card supersedes the call-time
+    // snippet; on error (nothing applied) or malformed meta, fall through to the
+    // generic "updated successfully" rendering.
+    presentResult(args, result: ToolResult): DiffResultView | undefined {
+      if (result.isError) return undefined
+      const diffs = diffsFromMeta(result.meta)
+      if (diffs === undefined) return undefined
+      return { card: 'diff', title: `Edit ${args.file_path}`, diffs }
+    },
   }))
 }

packages/fs/tool-fs/src/index.ts

@@ -32,6 +32,8 @@ export { applyWriteTool, formatWriteOutput, parseWriteArgs } from './write.ts'
 export { applyEditTool, formatEditOutput, parseEditArgs } from './edit.ts'
 export { READ_MAX_BYTES, READ_MAX_LINE_LENGTH, buildWindow, formatReadOutput } from './read-render.ts'
 export type { FileReadOutcome, FileTextLine, ReadWindow, WindowResult } from './read-render.ts'
+export { DIFF_CONTEXT, computeHunkDiffs, diffsFromMeta } from './diff.ts'
+export type { FsDiffMeta } from './diff.ts'
 
 /** Cordis plugin name used by loader diagnostics. */
 export const name = 'tool-fs'

packages/fs/tool-fs/src/write.ts

@@ -13,11 +13,12 @@
 
 import type { Context } from 'cordis'
 import { defineTool } from '@deepseek-ai/dsh-tools'
-import type { DiffCallView } from '@deepseek-ai/dsh-tools'
+import type { DiffCallView, DiffResultView, ToolResult } from '@deepseek-ai/dsh-tools'
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import type { FsWriteOutcome } from '@deepseek-ai/dsh-fs'
 import type {} from '@deepseek-ai/dsh-fs'
 import type {} from '@deepseek-ai/dsh-system-prompt'
+import { computeHunkDiffs, diffsFromMeta, type FsDiffMeta } from './diff.ts'
 import { sessionCwd } from './session-cwd.ts'
 
 /** Validate value constraints the schema DSL can't express. */
@@ -51,7 +52,7 @@ export function applyWriteTool(ctx: Context): void {
       file_path: { type: 'string', required: true, description: 'Path to write, resolved by the filesystem backend.' },
       content: { type: 'string', required: true, description: 'Full UTF-8 text content to write.' },
     },
-    async execute(args, exec): Promise<ContentBlock[]> {
+    async execute(args, exec): Promise<{ content: ContentBlock[]; meta?: FsDiffMeta }> {
       const input = parseWriteArgs(args)
       const cwd = sessionCwd(exec)
       const target = await ctx.fs.resolve(input.filePath, cwd !== undefined ? { cwd } : undefined)
@@ -61,7 +62,14 @@ export function applyWriteTool(ctx: Context): void {
       const outcome = await ctx.fs.writeText(target, input.content, intent, exec.signal)
       // Record the observed version (a no-op when no policy plugin listens).
       ctx.emit('fs/observed', target, outcome.version, exec)
-      return [{ type: 'text', text: formatWriteOutput(target.displayPath, outcome) }]
+      // Result-time contextual diff ONLY for an overwrite (a before-version
+      // exists). A create has no "before" — `outcome.before` is null — so it
+      // carries no result diff, leaving just the call-time whole-file card.
+      const diffs = outcome.before !== null ? computeHunkDiffs(input.filePath, outcome.before, outcome.after) : []
+      return {
+        content: [{ type: 'text', text: formatWriteOutput(target.displayPath, outcome) }],
+        ...diffs.length > 0 ? { meta: { diffs } } : {},
+      }
     },
     // Pure display: a diff card (an editor renders write as a new-file / full-
     // replace diff). `oldText: null` — a call-time presenter has no access to the
@@ -75,5 +83,15 @@ export function applyWriteTool(ctx: Context): void {
         locations: [{ path: args.file_path }],
       }
     },
+    // Result-time display: for an OVERWRITE, the applied contextual-diff hunks on
+    // `meta` supersede the call-time whole-file snippet. A create carries no meta
+    // (no "before"), so this returns undefined and the call-time new-file card
+    // stands; an error or malformed meta also falls through to generic rendering.
+    presentResult(args, result: ToolResult): DiffResultView | undefined {
+      if (result.isError) return undefined
+      const diffs = diffsFromMeta(result.meta)
+      if (diffs === undefined) return undefined
+      return { card: 'diff', title: `Write ${args.file_path}`, diffs }
+    },
   }))
 }

packages/fs/tool-fs/tests/diff.spec.ts

@@ -0,0 +1,113 @@
+/**
+ * Unit tests for the result-time contextual-diff computation (`src/diff.ts`):
+ * the pure before/after → {@link FileDiff}[] hunk builder and the defensive
+ * `meta` narrowing. These pin the exact hunk reconstruction (context lines,
+ * multi-hunk replaceAll, pure insertion/deletion, no-op) the ACP bridge renders.
+ */
+
+import { describe, expect, it } from 'vitest'
+import { computeHunkDiffs, diffsFromMeta, DIFF_CONTEXT } from '@deepseek-ai/dsh-tool-fs'
+import type { JsonValue } from '@deepseek-ai/dsh-session'
+
+const lines = (n: number): string => Array.from({ length: n }, (_, i) => `line${i + 1}`).join('\n') + '\n'
+
+describe('computeHunkDiffs', () => {
+  it('a single-line change yields one hunk with ±context lines on both sides', () => {
+    const before = lines(8)
+    const after = before.replace('line4', 'CHANGED')
+    const diffs = computeHunkDiffs('f.txt', before, after)
+    expect(diffs).toEqual([{
+      path: 'f.txt',
+      oldText: 'line1\nline2\nline3\nline4\nline5\nline6\nline7',
+      newText: 'line1\nline2\nline3\nCHANGED\nline5\nline6\nline7',
+    }])
+  })
+
+  it('a scattered replace_all yields one FileDiff PER hunk (matching per-site editor blocks)', () => {
+    const before = lines(20)
+    const after = before.replace('line3', 'A').replace('line16', 'B')
+    const diffs = computeHunkDiffs('f.txt', before, after)
+    expect(diffs).toHaveLength(2)
+    expect(diffs[0]?.path).toBe('f.txt')
+    expect(diffs[0]?.oldText).toContain('line3')
+    expect(diffs[0]?.newText).toContain('A')
+    expect(diffs[1]?.oldText).toContain('line16')
+    expect(diffs[1]?.newText).toContain('B')
+    // The two hunks are distinct sites, not one merged block.
+    expect(diffs[0]?.newText).not.toContain('B')
+    expect(diffs[1]?.newText).not.toContain('A')
+  })
+
+  it('identical before/after (a no-op) yields no hunks', () => {
+    expect(computeHunkDiffs('f.txt', 'same\n', 'same\n')).toEqual([])
+  })
+
+  it('a pure insertion into empty content reports oldText null (nothing to diff against)', () => {
+    const diffs = computeHunkDiffs('f.txt', '', 'brand new\n')
+    expect(diffs).toEqual([{ path: 'f.txt', oldText: null, newText: 'brand new' }])
+  })
+
+  it('a pure deletion of the whole file reports newText empty', () => {
+    const diffs = computeHunkDiffs('f.txt', 'gone\n', '')
+    expect(diffs).toEqual([{ path: 'f.txt', oldText: 'gone', newText: '' }])
+  })
+
+  it('drops the "\\ No newline at end of file" marker from a no-trailing-newline change', () => {
+    const diffs = computeHunkDiffs('f.txt', 'x', 'y')
+    // The marker line (starting with "\\") must never leak into a diff block.
+    expect(diffs).toEqual([{ path: 'f.txt', oldText: 'x', newText: 'y' }])
+    expect(diffs[0]?.oldText).not.toContain('\\')
+    expect(diffs[0]?.newText).not.toContain('\\')
+  })
+
+  it('uses DIFF_CONTEXT (3) surrounding lines', () => {
+    expect(DIFF_CONTEXT).toBe(3)
+    const before = lines(20)
+    const after = before.replace('line10', 'CHANGED')
+    const [diff] = computeHunkDiffs('f.txt', before, after)
+    // 3 context above (7,8,9) + the change + 3 below (11,12,13) = 7 lines a side.
+    expect(diff?.oldText?.split('\n')).toHaveLength(7)
+    expect(diff?.newText.split('\n')).toHaveLength(7)
+    expect(diff?.oldText?.split('\n')[0]).toBe('line7')
+  })
+})
+
+describe('diffsFromMeta (defensive narrowing)', () => {
+  // The narrowing accepts an opaque JsonValue; a malformed payload is not a
+  // statically-valid JsonValue, so route every case through one cast helper that
+  // mirrors how a hand-edited/older session log delivers arbitrary shapes.
+  const m = (value: unknown): JsonValue | undefined => value as JsonValue | undefined
+  const good = { diffs: [{ path: 'f.txt', oldText: 'a', newText: 'b' }] }
+
+  it('narrows a well-formed { diffs } payload', () => {
+    expect(diffsFromMeta(m(good))).toEqual(good.diffs)
+  })
+
+  it('accepts a diff whose oldText is null (a create-style hunk)', () => {
+    const meta = { diffs: [{ path: 'f.txt', oldText: null, newText: 'x' }] }
+    expect(diffsFromMeta(m(meta))).toEqual(meta.diffs)
+  })
+
+  it('rejects undefined / non-object / array meta', () => {
+    expect(diffsFromMeta(undefined)).toBeUndefined()
+    expect(diffsFromMeta(null)).toBeUndefined()
+    expect(diffsFromMeta(m('nope'))).toBeUndefined()
+    expect(diffsFromMeta(m([]))).toBeUndefined()
+  })
+
+  it('rejects a missing / empty / non-array diffs field', () => {
+    expect(diffsFromMeta(m({}))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: [] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: 'x' }))).toBeUndefined()
+  })
+
+  it('rejects a diffs array containing a malformed entry', () => {
+    expect(diffsFromMeta(m({ diffs: [{ path: 'f.txt', oldText: 'a' }] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: [{ path: 1, oldText: 'a', newText: 'b' }] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: [{ path: 'f', oldText: 5, newText: 'b' }] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: [{ path: 'f', oldText: 'a', newText: 7 }] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: [null] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: ['x'] }))).toBeUndefined()
+    expect(diffsFromMeta(m({ diffs: [[]] }))).toBeUndefined()
+  })
+})

packages/fs/tool-fs/tests/tools.spec.ts

@@ -57,16 +57,17 @@ class FakeFs extends FileSystem {
   override async writeText(target: FsTarget, content: string, expected?: FsWriteIntent): Promise<FsWriteOutcome> {
     this.throwIfArmed()
     this.writeIntents.push(expected)
-    const existed = this.files.has(target.targetKey)
+    const before = this.files.get(target.targetKey) ?? null
     this.files.set(target.targetKey, content)
-    return { operation: existed ? 'update' : 'create', version: FsVersion('v2') }
+    return { operation: before !== null ? 'update' : 'create', version: FsVersion('v2'), before, after: content }
   }
   override async editText(target: FsTarget, edit: FsEditRequest, expected?: { version: FsVersion }): Promise<FsEditOutcome> {
     this.throwIfArmed()
     this.editIntents.push(expected)
     const content = this.files.get(target.targetKey) ?? ''
-    this.files.set(target.targetKey, content.split(edit.oldString).join(edit.newString))
-    return { replacements: 1, replaceAll: edit.replaceAll, version: FsVersion('v3') }
+    const after = content.split(edit.oldString).join(edit.newString)
+    this.files.set(target.targetKey, after)
+    return { replacements: 1, replaceAll: edit.replaceAll, version: FsVersion('v3'), before: content, after }
   }
 }
 
@@ -395,3 +396,80 @@ describe('tool-owned presentation (pure presentCall)', () => {
     })
   })
 })
+
+describe('result-time contextual diff (meta + presentResult)', () => {
+  // An edit records the applied contextual hunk on `tool/result` meta, and the
+  // tool's presentResult narrows it back into a `diff` result card the bridge
+  // renders. Drive execute end-to-end so the meta is the REAL computed hunk.
+  const withContext = 'a\nb\nc\nOLD\nd\ne\nf\n'
+
+  it('edit: execute attaches the applied hunk as meta { diffs }', async () => {
+    const { ctx, fs } = await setup()
+    const session = { header: {} }
+    fs.files.set('key:a.txt', withContext)
+    await call(ctx, 'read', { file_path: 'a.txt' }, { session })
+    const result = await call(ctx, 'edit', { file_path: 'a.txt', old_string: 'OLD', new_string: 'NEW' }, { session })
+    expect(result.isError).toBe(false)
+    expect(result.meta).toEqual({
+      diffs: [{ path: 'a.txt', oldText: 'a\nb\nc\nOLD\nd\ne\nf', newText: 'a\nb\nc\nNEW\nd\ne\nf' }],
+    })
+  })
+
+  it('edit: presentResult turns the meta into a diff result card', async () => {
+    const { ctx, fs } = await setup()
+    const session = { header: {} }
+    fs.files.set('key:a.txt', withContext)
+    await call(ctx, 'read', { file_path: 'a.txt' }, { session })
+    const result = await call(ctx, 'edit', { file_path: 'a.txt', old_string: 'OLD', new_string: 'NEW' }, { session })
+    const view = ctx.tools.get('edit')?.presentResult?.({ file_path: 'a.txt', old_string: 'OLD', new_string: 'NEW' }, result)
+    expect(view).toEqual({
+      card: 'diff', title: 'Edit a.txt',
+      diffs: [{ path: 'a.txt', oldText: 'a\nb\nc\nOLD\nd\ne\nf', newText: 'a\nb\nc\nNEW\nd\ne\nf' }],
+    })
+  })
+
+  it('write OVERWRITE: execute attaches a contextual hunk; presentResult renders a diff card', async () => {
+    const { ctx, fs } = await setup()
+    const session = { header: {} }
+    fs.files.set('key:a.txt', withContext)
+    await call(ctx, 'read', { file_path: 'a.txt' }, { session })
+    const result = await call(ctx, 'write', { file_path: 'a.txt', content: 'a\nb\nc\nNEW\nd\ne\nf\n' }, { session })
+    expect(result.isError).toBe(false)
+    expect(result.meta).toEqual({ diffs: [{ path: 'a.txt', oldText: 'a\nb\nc\nOLD\nd\ne\nf', newText: 'a\nb\nc\nNEW\nd\ne\nf' }] })
+    const view = ctx.tools.get('write')?.presentResult?.({ file_path: 'a.txt', content: 'x' }, result)
+    expect(view).toEqual({ card: 'diff', title: 'Write a.txt', diffs: [{ path: 'a.txt', oldText: 'a\nb\nc\nOLD\nd\ne\nf', newText: 'a\nb\nc\nNEW\nd\ne\nf' }] })
+  })
+
+  it('write CREATE: no before-version → no meta, presentResult returns undefined (call-time card stands)', async () => {
+    const { ctx } = await setup()
+    const session = { header: {} }
+    const result = await call(ctx, 'write', { file_path: 'new.txt', content: 'fresh\n' }, { session })
+    expect(result.isError).toBe(false)
+    expect(result.meta).toBeUndefined()
+    expect(ctx.tools.get('write')?.presentResult?.({ file_path: 'new.txt', content: 'fresh\n' }, result)).toBeUndefined()
+  })
+
+  it('write OVERWRITE with identical content: a before exists but yields no hunk → no meta', async () => {
+    const { ctx, fs } = await setup()
+    const session = { header: {} }
+    fs.files.set('key:a.txt', 'same\n')
+    await call(ctx, 'read', { file_path: 'a.txt' }, { session })
+    const result = await call(ctx, 'write', { file_path: 'a.txt', content: 'same\n' }, { session })
+    expect(result.isError).toBe(false)
+    expect(result.meta).toBeUndefined()
+  })
+
+  it('presentResult returns undefined on an error result (nothing applied)', async () => {
+    const { ctx } = await setup()
+    const errorResult = { content: [{ type: 'text' as const, text: 'Error: boom' }], isError: true }
+    expect(ctx.tools.get('edit')?.presentResult?.({ file_path: 'a.txt', old_string: 'x', new_string: 'y' }, errorResult)).toBeUndefined()
+    expect(ctx.tools.get('write')?.presentResult?.({ file_path: 'a.txt', content: 'y' }, errorResult)).toBeUndefined()
+  })
+
+  it('presentResult returns undefined on malformed meta (defensive narrowing)', async () => {
+    const { ctx } = await setup()
+    const badMeta = { content: [{ type: 'text' as const, text: 'ok' }], isError: false, meta: { diffs: 'nope' } }
+    expect(ctx.tools.get('edit')?.presentResult?.({ file_path: 'a.txt', old_string: 'x', new_string: 'y' }, badMeta)).toBeUndefined()
+    expect(ctx.tools.get('write')?.presentResult?.({ file_path: 'a.txt', content: 'y' }, badMeta)).toBeUndefined()
+  })
+})

packages/ui/acp/acp-feature-support.md

@@ -99,7 +99,7 @@ Tool-call presentation is **owned by each tool** (`presentCall` / `presentResult
 | `ToolCallKind` mapping | S | ✅ | ✅ | ✅ | `execute`/`read`/`edit`/`other` inferred from the tool; richer mapping possible. |
 | `ToolCallStatus` | S | ✅ | ✅ | ✅ | `in_progress` → `completed`/`failed`. |
 | `content` blocks | S | ✅ | ✅ | ✅ | Text content; the description renders above the card. |
-| `diff` content | S | ✅ | ✅ | ✅ | The `write`/`edit` tools declare a `diff` render intent (`presentCall` → `{ card: 'diff' }`); the bridge emits `{ type: 'diff', path, oldText, newText }` content blocks (call-time, args-derived — applied-hunk diffs are a follow-up). |
+| `diff` content | S | ✅ | ✅ | ✅ | The `write`/`edit` tools declare a `diff` render intent: `presentCall` → a call-time `{ card: 'diff' }` snippet, and `presentResult` → a result-time `{ card: 'diff' }` carrying the APPLIED hunk with surrounding context lines (one hunk per `replace_all` site), computed from the before/after file text and persisted on the `tool/result` event. The bridge emits `{ type: 'diff', path, oldText, newText }` content blocks; the result hunk supersedes the call snippet. |
 | `terminal` content | S | ✅ | ✅ | ✅ | Via the Zed `_meta` terminal convention (see below), not the spec `terminal/*` sub-protocol. |
 | `locations` (follow-along) | S | ✅ | ✅ | ✅ | The `read`/`write`/`edit` tools emit `{ path, line? }` file-location hints via `presentCall`. |
 | `rawInput` | S | ✅ | ⚠️ | ✅ | Parsed tool args surfaced as `rawInput`. |
@@ -147,7 +147,6 @@ Ranked by how commonly the reference adapters ship them and how much UX they unl
 5. **Slash commands** (`available_commands_update`).
 6. **MCP passthrough** (`mcpServers` on `session/new` + `mcpCapabilities`).
 7. **Richer prompt content** — image / embedded `resource` blocks (needs a multimodal model path).
-8. **Applied-hunk diff rendering** — the `write`/`edit` diff cards ship (call-time, args-derived: whole `old_string`→`new_string`). Result-time structured-patch hunks with surrounding context (what `claude-agent-acp` derives from a PostToolUse hook) need a new result/event shape carrying the patch — a follow-up.
 9. **Usage reporting** (`usage_update`) — the harness already records token usage internally (on `assistant/message`).
 10. **Editor filesystem delegation** (`fs/read_text_file` / `fs/write_text_file`) — lets the agent see unsaved buffers; lower priority since the harness has direct disk access.
 

packages/ui/acp/src/index.ts

@@ -66,7 +66,7 @@ import { assertNever, CallId } from '@deepseek-ai/dsh-llm'
 import type { Agent, AgentStatus } from '@deepseek-ai/dsh-agent'
 import { AgentId } from '@deepseek-ai/dsh-agent'
 import { SessionId } from '@deepseek-ai/dsh-session'
-import type { SessionEvent, TodoItem, TurnEndReason } from '@deepseek-ai/dsh-session'
+import type { JsonValue, SessionEvent, TodoItem, TurnEndReason } from '@deepseek-ai/dsh-session'
 import type { ToolCallKind, ToolCallView, ToolRegistry, ToolResultView, TerminalResultView } from '@deepseek-ai/dsh-tools'
 // Side-effect type import: declaration-merges `ctx.sessionPersistence` onto
 // Context (the bridge injects it and reads `list()` for load cwd validation).
@@ -818,7 +818,7 @@ export function streamSessionEventUpdate(
       return
     }
     case 'tool/result': {
-      const view = presenter.result(event.data.callId, event.data.content, event.data.isError)
+      const view = presenter.result(event.data.callId, event.data.content, event.data.isError, event.data.meta)
       notify({ sessionId, update: toolResultUpdate(event.data.callId, view, event.data.isError, terminal) })
       return
     }
@@ -919,14 +919,14 @@ export class ToolPresenter {
   }
 
   /** Completed-state render intent for a `tool/result`; consumes the remembered `(name, args, card)`. */
-  result(callId: CallId, content: ContentBlock[], isError: boolean): ToolResultView {
+  result(callId: CallId, content: ContentBlock[], isError: boolean, meta?: JsonValue): ToolResultView {
     const call = this.pending.get(callId)
     this.pending.delete(callId)
     // No remembered call (unknown/late callId) → nothing to present from; raw content.
     if (call === undefined) return { card: 'generic', content }
     let present: ToolResultView | undefined
     try {
-      present = this.tools.get(call.name)?.presentResult?.(call.args, { content, isError })
+      present = this.tools.get(call.name)?.presentResult?.(call.args, { content, isError, ...meta !== undefined ? { meta } : {} })
     } catch (error: unknown) {
       // A throwing presentResult must not break streaming/replay: log + fall back.
       this.onError(`acp: tool "${call.name}" presentResult threw, using raw result: ${String(error)}`)
@@ -1126,7 +1126,9 @@ function terminalExitMeta(callId: string, view: TerminalResultView): TerminalExi
  * (the terminal card consumes them and `content` is OMITTED — a
  * `tool_call_update.content` REPLACES the call's content collection in Zed, so
  * re-sending would clobber the terminal block the call installed) and otherwise
- * derives the fenced ```console fallback from `output`.
+ * derives the fenced ```console fallback from `output`. A `diff` result emits the
+ * applied-hunk `{ type: 'diff' }` content blocks, which replace the call-time
+ * whole-file snippet in the editor.
  */
 function toolResultUpdate(callId: CallId, view: ToolResultView, isError: boolean, terminal: TerminalRendering): ToolCallSessionUpdate {
   const status = isError ? 'failed' as const : 'completed' as const
@@ -1167,6 +1169,20 @@ function toolResultUpdate(callId: CallId, view: ToolResultView, isError: boolean
         ...view.content !== undefined ? { content: toolResultContent(view.content) } : {},
         ...view.title !== undefined ? { title: view.title } : {},
       }
+    case 'diff': {
+      // A result-time applied-hunk diff: emit one `{ type: 'diff' }` content block
+      // per hunk (mirroring the call-side diff arm). `tool_call_update.content`
+      // REPLACES the call's content in an editor, so these hunks supersede the
+      // call-time whole-file snippet the pending card installed.
+      const content: AcpToolCallContent[] = view.diffs.map(d => ({ type: 'diff', path: d.path, oldText: d.oldText, newText: d.newText }))
+      return {
+        sessionUpdate: 'tool_call_update',
+        toolCallId: callId,
+        status,
+        ...content.length > 0 ? { content } : {},
+        ...view.title !== undefined ? { title: view.title } : {},
+      }
+    }
     default:
       return assertNever(view, 'ToolResultView.card')
   }

packages/ui/acp/tests/stream-update.spec.ts

@@ -618,6 +618,92 @@ describe('diff-card mapping', () => {
   })
 })
 
+describe('result-time diff card (REAL fs edit tool → tool_call_update diff blocks)', () => {
+  // Drive the SHIPPING fs edit tool through the bridge: the pending tool/call
+  // installs the call-time snippet, then the tool/result carries the tool's
+  // computed applied-hunk `meta`, which presentResult narrows into a `diff`
+  // result card the bridge forwards as `{ type: 'diff' }` content blocks. Uses
+  // the REAL tool (not a stand-in) per the anti-mock convention, mirroring the
+  // call-side diff test above.
+  async function fsCtx(): Promise<Context> {
+    const ctx = new Context()
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(FsLocal)
+    await ctx.plugin(ToolFs)
+    return ctx
+  }
+
+  function updatesWith(presenter: ToolPresenter, ...events: SessionEvent[]): SessionNotification['update'][] {
+    const out: SessionNotification['update'][] = []
+    for (const event of events) streamSessionEventUpdate(SessionId('s1'), event, n => out.push(n.update), presenter)
+    return out
+  }
+
+  it('forwards the applied-hunk meta onto the wire as tool_call_update diff content', async () => {
+    const ctx = await fsCtx()
+    const presenter = new ToolPresenter(ctx.tools)
+    const args = JSON.stringify({ file_path: 'src/b.ts', old_string: 'OLD', new_string: 'NEW' })
+    // The applied hunk the tool would compute and persist on the result meta.
+    const meta = { diffs: [{ path: 'src/b.ts', oldText: 'a\nOLD\nb', newText: 'a\nNEW\nb' }] }
+    const [, resultUpdate] = updatesWith(
+      presenter,
+      evt('tool/call', { turn: 1, step: 1, callId: CallId('e1'), name: 'edit', arguments: args }),
+      evt('tool/result', { turn: 1, step: 1, callId: CallId('e1'), content: [{ type: 'text', text: 'ok' }], isError: false, meta }),
+    )
+    expect(resultUpdate).toEqual({
+      sessionUpdate: 'tool_call_update',
+      toolCallId: 'e1',
+      status: 'completed',
+      title: 'Edit src/b.ts',
+      content: [{ type: 'diff', path: 'src/b.ts', oldText: 'a\nOLD\nb', newText: 'a\nNEW\nb' }],
+    })
+    await ctx.fiber.dispose()
+  })
+
+  it('an error result carries NO diff card (falls back to raw content)', async () => {
+    const ctx = await fsCtx()
+    const presenter = new ToolPresenter(ctx.tools)
+    const args = JSON.stringify({ file_path: 'src/b.ts', old_string: 'OLD', new_string: 'NEW' })
+    const [, resultUpdate] = updatesWith(
+      presenter,
+      evt('tool/call', { turn: 1, step: 1, callId: CallId('e1'), name: 'edit', arguments: args }),
+      evt('tool/result', { turn: 1, step: 1, callId: CallId('e1'), content: [{ type: 'text', text: 'Error: boom' }], isError: true }),
+    )
+    expect(resultUpdate).toMatchObject({ sessionUpdate: 'tool_call_update', status: 'failed' })
+    expect(resultUpdate).not.toHaveProperty('content', expect.arrayContaining([expect.objectContaining({ type: 'diff' })]))
+    await ctx.fiber.dispose()
+  })
+
+  it('a diff result with an EMPTY diffs array and no title omits both keys (nothing to send)', () => {
+    // A synthetic tool whose presentResult yields a `diff` card with no hunks and
+    // no title — the shipping fs tools never emit this (edit always has a hunk; an
+    // empty write returns undefined), so a stand-in is the only way to exercise
+    // the empty-content AND absent-title branches of the result-side diff arm.
+    const emptyDiffTool: ToolDefinition = {
+      name: 'writer',
+      description: 'writes a file',
+      parameters: {},
+      execute: async () => [],
+      presentCall: () => ({ card: 'diff', title: 'Write x', diffs: [{ path: 'x', oldText: null, newText: 'y' }] }),
+      presentResult: () => ({ card: 'diff', diffs: [] }),
+    }
+    const presenter = new ToolPresenter(registryOf(emptyDiffTool))
+    const [, resultUpdate] = updatesWith(
+      presenter,
+      evt('tool/call', { turn: 1, step: 1, callId: CallId('w1'), name: 'writer', arguments: '{}' }),
+      evt('tool/result', { turn: 1, step: 1, callId: CallId('w1'), content: [{ type: 'text', text: 'ok' }], isError: false }),
+    )
+    expect(resultUpdate).toEqual({
+      sessionUpdate: 'tool_call_update',
+      toolCallId: 'w1',
+      status: 'completed',
+    })
+    expect(resultUpdate).not.toHaveProperty('content')
+    expect(resultUpdate).not.toHaveProperty('title')
+  })
+})
+
 describe('relative-path display titles (bridge relativizes the title against the session cwd)', () => {
   // The bridge relativizes a file card's TITLE against the session workspace cwd
   // (mirroring the reference adapter's toDisplayPath), while leaving locations/

pnpm-lock.yaml

@@ -271,6 +271,9 @@ importers:
       '@deepseek-ai/dsh-llm':
         specifier: workspace:^
         version: link:../../llm/llm
+      '@deepseek-ai/dsh-session':
+        specifier: workspace:^
+        version: link:../session
       '@deepseek-ai/dsh-system-prompt':
         specifier: workspace:^
         version: link:../system-prompt
@@ -319,6 +322,10 @@ importers:
         version: 4.0.0-rc.6(@cordisjs/plugin-include@1.0.4)(@cordisjs/plugin-loader@1.0.0-rc.4)
 
   packages/fs/tool-fs:
+    dependencies:
+      diff:
+        specifier: ^9.0.0
+        version: 9.0.0
     devDependencies:
       '@deepseek-ai/dsh-agent':
         specifier: workspace:^
@@ -2196,6 +2203,10 @@ packages:
   devlop@1.1.0:
     resolution: {integrity: sha512-RWmIqhcFf1lRYBvNmr7qTNuyCt/7/ns2jbpp1+PalgE/rDQcBT0fioSMUpJ93irlUhC5hrg4cYqe6U+0ImW0rA==}
 
+  diff@9.0.0:
+    resolution: {integrity: sha512-svtcdpS8CgJyqAjEQIXdb3OjhFVVYjzGAPO8WGCmRbrml64SPw/jJD4GoE98aR7r25A0XcgrK3F02yw9R/vhQw==}
+    engines: {node: '>=0.3.1'}
+
   dts-resolver@3.0.0:
     resolution: {integrity: sha512-1T1f+z+4tl9XD+m+0HBgWoL/nm0bOIffyWaUuUSBlFg/86IWvfx+wjNaO/ybU0AJzG9/Mi5hBUgGV6zCmWEN7Q==}
     engines: {node: ^22.18.0 || >=24.0.0}
@@ -4393,6 +4404,8 @@ snapshots:
     dependencies:
       dequal: 2.0.3
 
+  diff@9.0.0: {}
+
   dts-resolver@3.0.0(oxc-resolver@11.20.0):
     optionalDependencies:
       oxc-resolver: 11.20.0