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https://github.com/deepseek-ai/deepseek-harness
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05426906b0
The 'adding a language is two table entries plus its renderer' checklist predates the `CodeSdkLanguage` union and now contradicts the mechanism sentence beside it: following it literally leaves the union untouched, which is exactly the excess-property error that sentence promises. It is three parallel edits, in the note's Decision and Consequences and in the `SDK_RENDERERS` JSDoc. Two guard descriptions still claimed work the compiler took over. The Decision's 'the drift this guards against' now names the `satisfies` pins and leaves the guards their reachable case, a mounted runtime reporting a language neither table knows; `resolveFlavor`'s JSDoc drops 'keeps the table coupled to SDK_RENDERERS' for the same reason. The Consequences said a half-added language 'cannot arise' for the runtime guards — it can, one PR later at the consumer's integration point, and never on this base; the claim is now about timing rather than impossibility.
core/ — product API spine
English | 中文
The session log, system-prompt assembly, tool registry, agent vocabulary, and concrete loop that form the harness's default control spine. These are product packages — the stable surface plugins and consumers build against.
| Package | Role | ctx key |
|---|---|---|
scope/ |
Scoped-context registration primitive | library — no ctx key |
session/ |
Event-sourced session log and in-memory store | ctx.sessions |
system-prompt/ |
Prompt and tool-schema assembly registry | ctx.systemPrompt |
tools/ |
Scoped tool registry and execution pipeline | ctx.tools |
agent/ |
Agent interface, registry, and event vocabulary | ctx.agents |
agent-loop/ |
Default concrete agent driver | ctx.agentLoop |
scope supplies the shared scoping primitive. agent owns the public seam, while agent-loop is its default implementation; extension plugins depend on the seam so the driver remains swappable.
Runnable compositions belong to examples/agent-spine-demo; this group owns only the swappable spine pieces.