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steering/message previously rendered inside a <steering source="…"> envelope like context/message. No model is trained on a <steering> tag, so the framing is arbitrary markup the model was never taught to read; recorded transcripts show it treating the instruction as third-party metadata and refusing it. Framing also does not belong on the session surface — a caller that wants a frame formats its own content. It now projects verbatim as a plain user-role message; the <context> envelope is untouched and renderTagged becomes context-only. Agent Note: .agents/notes/implemented/simplification/2026-07-20-unwrap-steering-message-projection.md
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:echo # keyless mock-model REPL
pnpm run demo:repl # readline coding agent (needs DEEPSEEK_API_KEY)
pnpm run demo:tui # full-screen TUI coding agent (needs DEEPSEEK_API_KEY)
pnpm run demo:headless -- "task" # one-shot coding agent (needs DEEPSEEK_API_KEY)
pnpm run demo:cordis # self-referential 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 and documentation graph index before package work. Local context lives in packages/ and vendor/.
For agents, follow AGENTS.md.