deepseek-harness/packages/code-runtime/README.md

code-runtime/ — code-execution capability family

The code-execution capability seam (see capability seams): an abstract runtime interface for executing one model-written program against host-provided async bindings, capturing what it printed and returned. The consumer is the tool registry's Code Mode, and the first implementation (a Node worker-thread backend) is specified alongside it in the Code Mode RFC. Product packages.

Package	Role	ctx key
code-runtime/	Abstract code-execution seam (interface + vocabulary)	ctx.codeRuntime

The interface lives at code-runtime/code-runtime/. Backends differ by execution substrate (worker thread, process, container) and by source language — both readonly descriptors on the service — and register ctx.codeRuntime without touching the interface or its consumer; that split is what makes a hardened backend a drop-in later.