deepseek-harness/packages/AGENTS.md

AGENTS.md — Harness Packages

These package-specific rules supplement the repo-wide conventions.

• Plugin export shape — namespace OR default, never both. A service package exports the service class as export default (the Loader instantiates it). A function/namespace plugin exports name / inject / Config / apply as separate named exports and must NOT add export default — the cordis Loader's unwrapExports does exports.default ?? exports, so a stray default export collapses the module to the bare apply function and silently discards the inject/name/Config namespace, leaving the plugin with no injected services (it then throws cannot get property … without inject at load). See docs/postmortem/0001.
• Read an optional (non-injected) service via ctx.get(name), not ctx.<name>. For a service a plugin reads opportunistically but deliberately leaves out of static inject (e.g. AgentLoop reading sessionPersistence), the ctx.<name> property proxy resolves by an ancestor-only fiber walk that throws when the call arrives through a foreign traceable shadow (the service lives on a sibling fiber). ctx.get(name) is the topology-independent global-store lookup, strict by default (an inactive/absent backend reads as undefined — prefer it over the ctx.get(name, false) overload, which also skips the active-state check). Services that ARE in static inject resolve fine via ctx.<name>. See docs/postmortem/0001.
• A plugin shipped via cordis.yml needs at least one test through the REAL Loader/export path — hand-built ctx.plugin({...}) mounts bypass unwrapExports and cannot catch a broken export shape. Full testing policy (tiers, with-key generosity, real-entry-path guards): docs/testing.md.
• Typed same-process service and plugin calls are contracts, not serialization boundaries. Prefer readonly borrowed values; materialize or defensively validate only at parser/config, queued, model/tool JSON, durable/file, worker, process, or wire boundaries.
• Represent one asynchronous operation with one lifecycle controller or transaction. Separate readiness, cancellation, disposal, reservation, or sentinel state requires an independent owner or settlement boundary; otherwise fold it while preserving rollback, callback containment, and quiescence.

Naming notes:

• A service src/index.ts exports the service class as export default + all public types; a function/namespace plugin src/index.ts exports name/inject/Config/apply as named exports and NO default (the export-shape rule above).
• src/types.ts contains only types — no runtime code.
• Tests live at package level under tests/, not src/__tests__/.
• A package's README and JSDoc are part of the change: altered behavior (config keys, defaults, error codes, wire fields) updates them in the same commit. doc-sync gates what it can; prose accuracy stays on the author (the documentation standard).
• Package READMEs document model/token effects using the canonical Model Experience format.
• Package READMEs carry ## Known Limitations and Deferred Work or a justified allowlist entry (rationale).