deepseek-harness/packages/support

support/ — dev/test/example infrastructure

Packages that exist to serve development, testing, and the examples rather than to ship as product API. They are real workspace packages (typed, tested, under the coverage gate), but they carry lower compatibility expectations: they may change or be removed when the development need behind them does, without the deprecation care a product package would warrant.

Package	Role	ctx key
invariants/	Dev-mode event-contract invariants + session-log freeze	(listens on session/*, agent/*)
ui-stdio/	Minimal stdio (readline) UI plugin: renders agent/* events, feeds stdin lines to the agent	(drives ctx.agents)
llm-replay/	Record/replay adapter: short-circuits llm/stream from a recorded session JSONL (keyless snapshot tests)	(listens on llm/stream)
subagent-mock/	Scripted SubagentProvider for deterministic seam/tool tests	(registers on ctx.subagents)

invariants runs only in dev mode (contract checks, not runtime behavior). ui-stdio and llm-replay were extracted from the examples for reuse and to bring them under the per-file coverage gate; they back the demos and the snapshot test tier. subagent-mock exercises the real ctx.subagents load path without a model or child agent. A package graduates OUT of support/ into a product group only when it gains documented product consumers.