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Curtis 'Fjord' Hawthorne 42e22f3bde
Add feature-gated freeform js_repl core runtime (#10674) 
## Summary

This PR adds an **experimental, feature-gated `js_repl` core runtime**
so models can execute JavaScript in a persistent REPL context across
tool calls.

The implementation integrates with existing feature gating, tool
registration, prompt composition, config/schema docs, and tests.

## What changed

- Added new experimental feature flag: `features.js_repl`.
- Added freeform `js_repl` tool and companion `js_repl_reset` tool.
- Gated tool availability behind `Feature::JsRepl`.
- Added conditional prompt-section injection for JS REPL instructions
via marker-based prompt processing.
- Implemented JS REPL handlers, including freeform parsing and pragma
support (timeout/reset controls).
- Added runtime resolution order for Node:
  1. `CODEX_JS_REPL_NODE_PATH`
  2. `js_repl_node_path` in config
  3. `PATH`
- Added JS runtime assets/version files and updated docs/schema.

## Why

This enables richer agent workflows that require incremental JavaScript
execution with preserved state, while keeping rollout safe behind an
explicit feature flag.

## Testing

Coverage includes:

- Feature-flag gating behavior for tool exposure.
- Freeform parser/pragma handling edge cases.
- Runtime behavior (state persistence across calls and top-level `await`
support).

## Usage

```toml
[features]
js_repl = true
```

Optional runtime override:

- `CODEX_JS_REPL_NODE_PATH`, or
- `js_repl_node_path` in config.

#### [git stack](https://github.com/magus/git-stack-cli)
- 👉 `1` https://github.com/openai/codex/pull/10674
- ⏳ `2` https://github.com/openai/codex/pull/10672
- ⏳ `3` https://github.com/openai/codex/pull/10671
- ⏳ `4` https://github.com/openai/codex/pull/10673
- ⏳ `5` https://github.com/openai/codex/pull/10670
2026-02-11 12:05:02 -08:00
..
agents_md.md Rename hierarchical_agents to child_agents_md (#9215) 2026-01-14 19:14:24 +00:00
authentication.md Replaced user documentation with links to developers docs site (#8662) 2026-01-02 13:01:53 -07:00
CLA.md chore: subject docs/*.md to Prettier checks (#4645) 2025-10-03 11:35:48 -07:00
config.md [connectors] Support connectors part 1 - App server & MCP (#9667) 2026-01-22 16:48:43 -08:00
contributing.md [Codex][CLI] Gate image inputs by model modalities (#10271) 2026-02-02 18:56:39 -08:00
example-config.md Replaced user documentation with links to developers docs site (#8662) 2026-01-02 13:01:53 -07:00
exec.md Replaced user documentation with links to developers docs site (#8662) 2026-01-02 13:01:53 -07:00
execpolicy.md Replaced user documentation with links to developers docs site (#8662) 2026-01-02 13:01:53 -07:00
exit-confirmation-prompt-design.md feat(tui): retire the tui2 experiment (#9640) 2026-01-22 01:02:29 +00:00
getting-started.md Replaced user documentation with links to developers docs site (#8662) 2026-01-02 13:01:53 -07:00
install.md feat(core): add configurable log_dir (#10678) 2026-02-05 01:23:30 +00:00
js_repl.md Add feature-gated freeform js_repl core runtime (#10674) 2026-02-11 12:05:02 -08:00
license.md chore: subject docs/*.md to Prettier checks (#4645) 2025-10-03 11:35:48 -07:00
open-source-fund.md chore: subject docs/*.md to Prettier checks (#4645) 2025-10-03 11:35:48 -07:00
prompts.md Replaced user documentation with links to developers docs site (#8662) 2026-01-02 13:01:53 -07:00
sandbox.md Replaced user documentation with links to developers docs site (#8662) 2026-01-02 13:01:53 -07:00
skills.md Point skills docs to developer documentation site (#8407) 2025-12-21 16:18:58 -08:00
slash_commands.md Replaced user documentation with links to developers docs site (#8662) 2026-01-02 13:01:53 -07:00
tui-alternate-screen.md fix: add tui.alternate_screen config and --no-alt-screen CLI flag for Zellij scrollback (#8555) 2026-01-09 18:38:26 +00:00
tui-chat-composer.md tui: keep history recall cursor at line end (#11295) 2026-02-10 17:21:46 +00:00
tui-request-user-input.md tui: make Esc clear request_user_input notes while notes are shown (#10569) 2026-02-03 16:17:06 -08:00
tui-stream-chunking-review.md feat(tui): pace catch-up stream chunking with hysteresis (#10461) 2026-02-03 15:01:51 -08:00
tui-stream-chunking-tuning.md feat(tui): pace catch-up stream chunking with hysteresis (#10461) 2026-02-03 15:01:51 -08:00
tui-stream-chunking-validation.md feat(core): add configurable log_dir (#10678) 2026-02-05 01:23:30 +00:00