Tianyi Cui
95c8c878e1
Codex code-review round 4 flagged the return channel: an async IIFE Promise-assimilates a returned thenable, so its then() runs past the sync slice and the RESOLUTION replaces the raw object. Verified against the real engine and judged behavior, not defect: - Assimilation is standard JavaScript (an async function's returned thenable resolves before the caller sees it) and is load-bearing ergonomics: an un-awaited 'return agent(...)' / 'return parallel(...)' resolves to the intended value precisely because of it. Rejecting callable-then returns would break that; intercepting pre-assimilation is spec-impossible (the Get(v,'then') and job enqueue are internal to promise resolution). - The realm-boundary guard applies to the RESOLUTION (a thenable resolving to non-JSON is still RESULT_UNSERIALIZABLE), so nothing crosses unmaterialized. - A spin inside a returned thenable's then() is the same accepted class as any post-slice spin (it runs on the microtask queue, past the vm timeout's reach); the docs previously said 'after the first await', which was too narrow — reworded to 'past the initial synchronous slice (an await continuation, or a thenable's then invoked by promise resolution)'. Pinned with an engine test (un-awaited return agent(); custom thenable resolution as the return value; thenable resolving to non-JSON rejects), and the limitation wording updated in the module doc, README, and RFC.
DeepSeek Harness
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The DeepSeek Harness SDK is a plugin-based SDK for building agent harnesses.
Development
This monorepo is built on the Cordis framework (vendored as source under vendor/), microkernel-style: everything is a plugin.
pnpm install
pnpm run test # vitest
pnpm run demo:repl # REPL agent demo (needs DEEPSEEK_API_KEY)
pnpm run demo:acp # ACP server agent demo (needs DEEPSEEK_API_KEY)
For humans, start with the development guide for local setup, hooks, environment variables, and quality gates, then read the architecture design before package work. Local context lives in packages/ and vendor/.
For agents, follow AGENTS.md.