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The load-time output-budget/addressSpaceMb gate used a worst-case multiple of 8, assuming two simultaneous ~4x astral copies (the built string and its encode). Three are live at the peak: on the newline path a single write holds the caller's text argument, the line slice handed to push, and push's encode copy; the settlement flush_line path held the pending chunks, their join, and that encode copy. A budget admitted at 8x (e.g. maxLogBytes 48 MiB against addressSpaceMb 512) could still OOM the child. The multiple is now 12, the strict `>` is `>=` so a budget whose peak exactly equals the room left after the interpreter baseline is rejected (that peak plus the baseline is the whole address space), and flush_line drops the pending chunks before its push to match the newline path's join-clear-push order. The child re-check mirror and both note sides move in step; config-catalog is regenerated from the updated field JSDoc.
description, kind
| description | kind |
|---|---|
| Package map for the code-execution capability family: what program execution does for you, and which package owns each part. | package-group |
code-runtime/ — code-execution capability family
English | 中文
Summary
The code-runtime/ group provides program execution: a model writes one program that calls host-provided functions as ordinary async calls, and a runtime executes it in isolation and returns only what the program printed and returned. One package defines the shared capability (ctx.codeRuntime), a second executes TypeScript programs in a fresh Node worker thread, and a third owns the wire protocol between a Node host and a CPython subprocess for the Python backend. Every run is independent — no state carries from one program to the next — and failures come back as part of the result, so the caller can see why a program failed and feed that back to the model.
Table of Contents
Packages
These three packages together provide program execution; each README describes what its part does.
| Package | Role | ctx key |
|---|---|---|
code-runtime/ |
Defines what a code runtime does: run one program against host-provided bindings and report what it printed and returned | ctx.codeRuntime |
code-runtime-worker-thread/ |
Executes TypeScript programs, each in a fresh Node worker thread | registers ctx.codeRuntime |
code-runtime-python/ |
Owns the fd-3 wire protocol between a Node host and a CPython subprocess, the Python backend's protocol layer | — |
Related documentation
Start with the subsystem reference for the service contract, then the PTC mode design that consumes this capability and the capability-seam model it follows.
- Code runtime subsystem reference — request/result vocabulary, bindings, and the
ctx.codeRuntimecordis surface. - PTC mode Agent Note — how the tool registry presents
run_codeto the model. - Capability seams — the Service Definition / Service Provider / Consumer split this family follows.
Dev Note
Working context for maintainers — click to expand
None.