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Curtis 'Fjord' Hawthorne eb77db2957
Log js_repl nested tool responses in rollout history (#12837)
## Summary

- add tracing-based diagnostics for nested `codex.tool(...)` calls made
from `js_repl`
- emit a bounded, sanitized summary at `info!`
- emit the exact raw serialized response object or error string seen by
JavaScript at `trace!`
- document how to enable these logs and where to find them, especially
for `codex app-server`

## Why

Nested `codex.tool(...)` calls inside `js_repl` are a debugging
boundary: JavaScript sees the tool result, but that result is otherwise
hard to inspect from outside the kernel.

This change adds explicit tracing for that path using the repo’s normal
observability pattern:
- `info` for compact summaries
- `trace` for exact raw payloads when deep debugging is needed

## What changed

- `js_repl` now summarizes nested tool-call results across the response
shapes it can receive:
  - message content
  - function-call outputs
  - custom tool outputs
  - MCP tool results and MCP error results
  - direct error strings
- each nested `codex.tool(...)` completion logs:
  - `exec_id`
  - `tool_call_id`
  - `tool_name`
  - `ok`
  - a bounded summary struct describing the payload shape
- at `trace`, the same path also logs the exact serialized response
object or error string that JavaScript received
- docs now include concrete logging examples for `codex app-server`
- unit coverage was added for multimodal function output summaries and
error summaries

## How to use it

### Summary-only logging

Set:

```sh
RUST_LOG=codex_core::tools::js_repl=info
```

For `codex app-server`, tracing output is written to the server process
`stderr`.

Example:

```sh
RUST_LOG=codex_core::tools::js_repl=info \
LOG_FORMAT=json \
codex app-server \
2> /tmp/codex-app-server.log
```

This emits bounded summary lines for nested `codex.tool(...)` calls.

### Full raw debugging

Set:

```sh
RUST_LOG=codex_core::tools::js_repl=trace
```

Example:

```sh
RUST_LOG=codex_core::tools::js_repl=trace \
LOG_FORMAT=json \
codex app-server \
2> /tmp/codex-app-server.log
```

At `trace`, you get:
- the same `info` summary line
- a `trace` line with the exact serialized response object seen by
JavaScript
- or the exact error string if the nested tool call failed

### Where the logs go

For `codex app-server`, these logs go to process `stderr`, so redirect
or capture `stderr` to inspect them.

Example:

```sh
RUST_LOG=codex_core::tools::js_repl=trace \
LOG_FORMAT=json \
/Users/fjord/code/codex/codex-rs/target/debug/codex app-server \
2> /tmp/codex-app-server.log
```

Then inspect:

```sh
rg "js_repl nested tool call" /tmp/codex-app-server.log
```

Without an explicit `RUST_LOG` override, these `js_repl` nested
tool-call logs are typically not visible.
2026-02-26 10:12:28 -08:00
.codex/skills Add PR babysitting skill for this repo (#12513) 2026-02-22 15:36:28 -08:00
.devcontainer chore: install an extension for TOML syntax highlighting in the devcontainer (#1650) 2025-07-22 10:58:09 -07:00
.github Attempt 2 to fix release (#12856) 2026-02-25 19:12:19 -08:00
.vscode Move rust analyzer target dir (#5328) 2025-10-18 17:31:46 -07:00
codex-cli Update pnpm versions to fix cve-2026-24842 (#12009) 2026-02-19 14:27:55 -08:00
codex-rs Log js_repl nested tool responses in rollout history (#12837) 2026-02-26 10:12:28 -08:00
docs Log js_repl nested tool responses in rollout history (#12837) 2026-02-26 10:12:28 -08:00
patches voice transcription (#3381) 2026-02-23 22:15:18 +00:00
scripts Add macOS and Linux direct install script (#12740) 2026-02-26 00:33:50 +00:00
sdk/typescript Update pnpm versions to fix cve-2026-24842 (#12009) 2026-02-19 14:27:55 -08:00
shell-tool-mcp refactor: delete exec-server and move execve wrapper into shell-escalation (#12632) 2026-02-23 20:10:22 -08:00
third_party Add feature-gated freeform js_repl core runtime (#10674) 2026-02-11 12:05:02 -08:00
.bazelignore [bazel] Improve runfiles handling (#10098) 2026-01-29 00:15:44 +00:00
.bazelrc [bazel] Upgrade some rulesets in preparation for enabling windows (#11109) 2026-02-08 13:40:32 -08:00
.bazelversion [bazel] Upgrade to bazel9 (#9576) 2026-01-21 13:25:36 +00:00
.codespellignore feat(network-proxy): structured policy signaling and attempt correlation to core (#11662) 2026-02-13 09:01:11 +00:00
.codespellrc feat(network-proxy): structured policy signaling and attempt correlation to core (#11662) 2026-02-13 09:01:11 +00:00
.gitignore gitignore bazel-* (#8911) 2026-01-08 07:50:58 -08:00
.markdownlint-cli2.yaml fix(tui): document paste-burst state machine (#9020) 2026-01-13 11:48:31 -08:00
.npmrc chore: migrate to pnpm for improved monorepo management (#287) 2025-04-18 16:25:15 -07:00
.prettierignore [apply-patch] Clean up apply-patch tool definitions (#2539) 2025-08-21 20:07:41 -07:00
.prettierrc.toml Initial commit 2025-04-16 12:56:08 -04:00
AGENTS.md feat: discourage the use of the --all-features flag (#12429) 2026-02-20 23:02:24 -08:00
announcement_tip.toml nit: test an (#10892) 2026-02-06 14:41:53 +01:00
BUILD.bazel voice transcription (#3381) 2026-02-23 22:15:18 +00:00
CHANGELOG.md Documentation improvement: add missing period (#3754) 2025-10-30 13:01:33 -07:00
cliff.toml docs(changelog): update install command to @openai/codex@<version> (#2073) 2025-10-18 11:02:22 -07:00
defs.bzl [bazel] Fix proc_macro_dep libs (#12274) 2026-02-19 13:38:37 -08:00
flake.lock fix(nix): update flake for newer Rust toolchain requirements (#10302) 2026-01-31 11:34:53 -08:00
flake.nix fix(nix): use correct version from Cargo.toml in flake build (#11770) 2026-02-13 12:19:25 -08:00
justfile feat: discourage the use of the --all-features flag (#12429) 2026-02-20 23:02:24 -08:00
LICENSE Initial commit 2025-04-16 12:56:08 -04:00
MODULE.bazel voice transcription (#3381) 2026-02-23 22:15:18 +00:00
MODULE.bazel.lock Revert "fix(bazel): replace askama templates with include_str! in memories" (#12795) 2026-02-25 18:06:17 +00:00
NOTICE Add feature-gated freeform js_repl core runtime (#10674) 2026-02-11 12:05:02 -08:00
package.json Update pnpm versions to fix cve-2026-24842 (#12009) 2026-02-19 14:27:55 -08:00
pnpm-lock.yaml chore: ensure pnpm-workspace.yaml is up-to-date (#10140) 2026-01-29 10:49:03 -08:00
pnpm-workspace.yaml chore: ensure pnpm-workspace.yaml is up-to-date (#10140) 2026-01-29 10:49:03 -08:00
rbe.bzl feat: update Docker image digest to reflect #12205 (#12372) 2026-02-24 22:19:46 -08:00
README.md docs: mention Codex app in README intro (#11926) 2026-02-16 17:35:05 +01:00
SECURITY.md docs: add codex security policy (#12193) 2026-02-19 09:12:59 -08:00

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