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The PID-reuse guard refused to signal whenever the current reading differed from the one taken at spawn, including when it was ABSENT. On Linux a reaped leader has no /proc/<pid>/stat, so every teardown after the leader exited skipped SIGTERM/SIGKILL while the group it led still held survivors -- the exact case the process-group teardown exists to reap. Three same-group survivor tests went red on the coverage lane; they pass on Darwin because the reader always returns undefined there, leaving the guard inert. Only a present-and-different reading now blocks the signal. Verified on the self-hosted Linux box: a reaped leader with live survivors allows the signal, a pid whose start time differs still blocks it, and a live matching process is signalled.
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.