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https://github.com/deepseek-ai/deepseek-harness
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Prove the full MCP protocol flow works end-to-end against real servers: - Self-written fixture server: tool discovery, execution, error handling, image placeholder, toolPrefix, and clean disposal - @modelcontextprotocol/server-everything: echo, get-sum, get-tiny-image - @modelcontextprotocol/server-filesystem: write_file + read_file round-trip, list_directory with world-verification All 15 tests keyless and deterministic (no API key needed).
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 and documentation graph index before package work. Local context lives in packages/ and vendor/.
For agents, follow AGENTS.md.