db857f62c08404e6767917163a191cdfdba29b1d
The sandbox docs overclaimed a containment contract the design never makes: "capability access is routed through cordis services, never Node built-ins, so everything a mounted plugin does stays inspectable and disposable". The host-realm helpers on the sandbox global (harness, console, btoa) are reachable functions, so mount code that goes looking can reach the host realm through one of them — accepted under the trust stance, because the ctx a mount ultimately receives is fully privileged anyway. Reword the sandbox module doc, the README trust stance, and the RFC sandbox-semantics section to say exactly that: the traps and small global surface STEER honest code onto the cordis services; they are not a security boundary.
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.
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