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README.md

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description: "Browser half of dynamic Cordis packages for users and maintainers choosing, composing, or debugging how a page answers run requests and loads browser-half code."

kind: "package-reference"

@deepseek-ai/dsh-cordis-client-runner

English | 中文

Summary

dsh-cordis-client-runner runs the browser half of process-local dynamic packages for programmatic callers and existing browser controls. It loads a definition after an approved request or explicit user gesture, and removes it when the Host retracts the run. Page refresh does not restore definitions. Creator UI plugins use installed Client modules through Plugin Manager.

Table of Contents

Use this package

Mount this plugin in a web client whose composition also mounts the host runner — the host half runs in the process, this browser half in the page. When a dynamic package that has a browser half is run, the open pages receive a run request; this package carries out the load on this page, and the UI package (ui-cordis) renders the panel and cards a person uses to answer it. Host-only packages need no browser half and therefore no page: the host runs them itself.

What the page does

A browser half is written in plain JavaScript — no JSX, no TypeScript, no module imports — and runs as an async function. It receives a fixed set of names — React, console, styles, and host — while browser globals like fetch and setTimeout are unavailable. The plugin it returns can use the lifecycle verbs and only the services it declared in its own inject. Calling host.call(method, args) from the loaded half reaches its own host half. A crash that happens while React renders the loaded half is reported to the host with the slot, whether the crash removed the entry, and a message written for the author.

What the run surface offers

A run surface can answer a pending host request — approving it, optionally covering future versions of the same plugin, or declining it — and can start a definition at the user's own gesture, which authorizes it. Each definition has at most one in-flight activity, so an affordance built on that state survives a remount. What the surface shows about this page is page-local: the last render crash per package, why this page's own attempt failed, and whether a package is loaded here — never the host's view of what is running.

Lifecycle boundaries

Loading is idempotent: asking to load a revision this page already runs changes nothing, a newer revision replaces the loaded one, and the same revision after a retract loads afresh. Operations on a definition serialize. A refresh starts clean by design — the host still holds the definition, this page does not run it until asked again.

Understand the implementation

Implementation internals — click to expand This section explains the design behind the browser half; the observable behavior is fully covered in [Use this package](#use-this-package). ### Design philosophy The browser half is built on one principle: a dynamic package must ride the same activation gating, fiber-effect cleanup, and status projection as a static one. The evaluated plugin is seated in the module table and mounted through `loader.create`; unload removes the entry, waits for its fiber's cleanup, then invalidates its factory and removes its styles. The guard is a whitelist — lifecycle verbs plus declared services — that mirrors the host-side sandbox facade, so a package author meets one contract on both halves. One observer feeds two outlets: the slot registry's entry-error seam is watched only here, and a crash belonging to a package this runner seated goes upstream to the host for the model and onto this package's own `renderFailures` for the panel. ### Source map | File | Role | |---|---| | [`src/client/index.ts`](src/client/index.ts) | Plugin entry: runner, orchestrator, inspect registry, forwarded-event subscription | | [`src/client/runtime.ts`](src/client/runtime.ts) | Load engine: convergence by run identity, guarded mount, retract | | [`src/client/orchestrator.ts`](src/client/orchestrator.ts) | Run orchestration: host half first, source fetch, browser half, one resolution | | [`src/client/evaluator.ts`](src/client/evaluator.ts) | Closure evaluation: the symbol surface and its teaching traps | | [`src/client/guard.ts`](src/client/guard.ts) | The whitelisting `ctx` façade for loaded browser halves | | [`src/client/inspect-registry.ts`](src/client/inspect-registry.ts) | Client Inspect Providers and the pending-query router | | [`src/client/providers.ts`](src/client/providers.ts) | First-party client Inspect Providers (slots, theme, events) | | [`src/client/timer.ts`](src/client/timer.ts) | The client timer service dynamic packages inject | ### How a run is carried out A `cordis/request-run` event asks this page whether to run a definition. Whoever answers — the page after an approval, or the user pressing run — drives the orchestration: the host half first (so a host-half failure short-circuits before the browser has moved), then the source fetch, then the browser half, then one resolution carrying what happened. The browser half's source is evaluated as an async function body with the symbol surface as parameters, the returned plugin is guard-wrapped and mounted through the loader, and the resolution reports the loaded revision or the failing stage with the closure's, guard's, or fiber's message. `host.call` routes through the Remote namespace; an omitted argument travels as `null`, and a payload the generated codec refuses becomes a teaching error naming the call and the contract.

Further Exploration

Read these pages when the package-level contract is not enough. They move from the browser half to the host that asks it, the tools whose runs it answers, and the surface that renders it.

Model Experience

Run resolution relayed by the Host

What the model sees

This package contributes no tool or prompt. It resolves cordis/request-run with activation success, missing services, rejection, or Host/Client failures. The Host runner owns any message relayed to the session.

Token effect

Conditional and bounded: at most one resolution per run request, spent inside the runner result the host already emits. The text is data-dependent (a definition's own error message) and this package retains nothing across requests — a page's later load failures are page-local diagnostics with no model-visible carrier.

KV Cache effect

Host steering appends to the session history; this package does not rewrite earlier messages.

Render failure, after the run settled

What the model sees

React can fail after a successful load. The Client reports each owned entry failure with its slot, message, and whether the entry was removed. The Host retains the latest failure and steers the owning session; the page also displays its local failure.

Token effect

Conditional and bounded by the host's retention, not by this page: one report per crash, and the host keeps only the latest per package, so a repeatedly crashing entry costs the model one message rather than a growing list. The report never enters a tool result of its own — the model pays for it only when it is steered or asks.

KV Cache effect

None of its own. Reports travel over RPC and are stored, not appended to the conversation; the model reads them through a steering message or an inspection it chose to make, which extends the tail like any other tool result.

Known Limitations and Deferred Work

These limits define where the browser half needs special care. They are current package constraints, not a task backlog.

  • A refused resolution is not retried — the acknowledgement of resolveRequestRun is not read, so when the host declines a stale success (accepted: false, because the definition's revision moved on while this page was loading) the page keeps what it loaded and does not orchestrate again. The request stays answerable — another page's answer or the caller's cancellation settles it — and the stop that bumped the revision retracts the stale load.
  • The plugin stays parked until the host namespace exists — it declares remote.dynamicCordisRunner, so it loads no browser half whose host half it could never reach.
  • Slot admission has no carrier — the dispatched row declares services, not target slots, so per-deployment allow or deny lists for slot admission have nowhere to ride.
  • Guard whitelists are hand-mirrored twins — the browser guard replicates the host-side sandbox facade; sharing one specification is deferred.

Dev Note

Working context for maintainers — click to expand None.

Runtime invariant: No companion is published. The owned relation (a live Plugin's loader entry exists exactly while one Plugin Run ID is live) is browser-only state reachable through the client half's service, which the node-plane companion cannot observe. The relation is asserted by the package's own load/teardown coverage instead.