`SDK_RENDERERS` and `RUN_CODE_FLAVORS` had to stay in step by review alone: the `Object.hasOwn` guards catch drift only once a runtime reporting the half-added language exists, which is the one case that cannot arise. Both tables are now `satisfies`-checked against a shared `CodeSdkLanguage` union, so a missing or extra entry fails `typecheck`. The declared `Record<string, …>` type stays, since `CodeRuntime.language` is an unconstrained `string`. The code-runtime seam's own README row and `CodeRuntime.language` JSDoc still named `'typescript'` as the sole well-known value; both now name `'python'` too and say only `'typescript'` has a published backend.
code-runtime/ — code-execution capability family
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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 (tools: { mode: code } — the run_code tool and the SDK generated in the loaded runtime's language); design in the Code Mode Agent Note. Product packages.
| Package | Role | ctx key |
|---|---|---|
code-runtime/ |
Code-execution seam and shared vocabulary | ctx.codeRuntime |
code-runtime-worker/ |
Worker-thread backend | registers ctx.codeRuntime |
Backends register the seam without changing its consumer. The child READMEs own language, isolation, and execution-budget details.