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The vocabulary maps grow by declaration merging, and the admission policy stated on TurnEndReasonMap is that a variant lands with its first emitter. Three declared items had no producer and no consumer: - CacheHint and the cache?: CacheHint fields on TextBlock/ToolResultBlock: nothing constructs a block with cache:, and neither adapter reads .cache — DeepSeek prompt caching is automatic (hints map OUT of responses, never IN). - MessageSourceMap.agent: zero constructors; the subagent backends send the parent prompt with no source (logs as user), and the envelope renderer interpolates source.kind without routing on it. - TurnTriggerMap.continuation: the loop structurally cannot emit it — continuation is further steps within a turn, never a new turn — and its only writer was an llm-replay test fixture that needed any non-message trigger (now an injection trigger). Each variant returns the day it gains a real producer, via the same merge-extensible maps. Docs updated in the same change: the MessageSourceMap paste in core.md, the TurnTriggerMap paste in session.md (manifest untouched — both symbols survive), the content-block vocabulary RFC's cache-hints consequence line, and the RFC moved to implemented/ and amended to shipped reality (the image block's own cache field had already left with the drop-image 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.