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# code-runtime/ — code-execution capability family
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English | [中文 ](README.zh.md )
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The code-execution capability seam (see [capability seams ](../../.agents/notes/implemented/architecture/2026-06-13-capability-seams.md )): a runtime Service Definition for executing one model-written program against host-provided async bindings, capturing what it printed and returned; replaceable providers; and the tool registry's [Code Mode ](../core/tools/README.md ) Consumer (`tools: { mode: code }` — the `run_code` tool and the SDK generated in the loaded runtime's `language` ). Design is in the [Code Mode Agent Note ](../../.agents/notes/implemented/feature/2026-06-15-code-mode.md ). **Product** packages.
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| Package | Role | ctx key |
|---|---|---|
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| [`code-runtime/` ](code-runtime/README.md ) | Service Definition and shared vocabulary | `ctx.codeRuntime` |
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| [`code-runtime-worker/` ](code-runtime-worker-thread/README.md ) | Worker-thread backend | registers `ctx.codeRuntime` |
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Providers register the service without changing its Consumer. The child READMEs own language, isolation, and execution-budget details.
docs: anchor each subsystem page to its package group; make group READMEs thin tables
core.md read as a type grab-bag: LLM wire vocabulary up front, the agent/loop story buried, and no correspondence to packages/core. It now opens on the packages/core control spine — the package-by-package loop map with a Page column into session/system-prompt/tools/scope — and keeps only what the spine group declares plus the repo-wide patterns: the Agent handle with its delivery/cancellation/interception contracts, the SessionEvent envelope, branded ids, the …Map pattern. The conversation vocabulary (Message/ContentBlock, the model request, adapters — 17 type-equiv blocks) moves to llm-streaming.md, which now declares packages/llm end-to-end; the duplicate ContentBlockMap paste near its seam section folds into the moved section, and the manifest, LINK_MAP, README table rows, website label (Core data structures → Core), and inbound anchors follow.
Every packages/<group>/README pair is now a thin front door in one shape: a why-first intro (bash's seam-pattern-first paragraph rewritten as 'shell execution for the agent'), the package table, and a closing pointer to the owning docs/subsystems page — the bash-style table stays the load-bearing middle. Load-bearing trailing paragraphs relocate rather than vanish: the fs no-timeout rationale becomes a filesystem.md section (both languages), session's four sectioned tables merge into one 12-row table, examples' legacy-bin H2 collapses to a pointer at jsonrpc-demo's README, and design rationale that already lives in an Agent Note or subsystem page is now linked instead of restated. All 40 pair records re-recorded.
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The subsystem reference — run requests/results, binding namespaces, the failure taxonomy — is [docs/subsystems/code-runtime.md ](../../docs/subsystems/code-runtime.md ).