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sayan-oai 8b1238856b core: allow excluding tool namespaces from code mode (#26320 )

## Why

Research and training setups need to control which tool namespaces
appear inside code mode's nested `tools` surface without disabling those
tools entirely. This makes it possible to train against a deliberately
reduced nested-tool setup while preserving the normal direct and
deferred tool paths.

## What

- Extend `features.code_mode` to accept structured configuration while
preserving the existing boolean syntax.
- Add an exact `excluded_tool_namespaces` list under
`[features.code_mode]`:

  ```toml
  [features.code_mode]
  enabled = true
  excluded_tool_namespaces = ["mcp__codex_apps", "multi_agent_v1"]
  ```

- Filter matching canonical `ToolName` namespaces when constructing code
mode's nested router and code-mode-specific direct tool descriptions.
- Keep excluded tools registered, directly exposed in mixed code mode,
and discoverable through top-level `tool_search` when otherwise
eligible.
- Derive deferred nested-tool guidance after namespace filtering so the
`exec` description does not advertise excluded-only deferred tools.
- Preserve the boolean/table representation when materializing config
locks and update the generated config schema.

## Testing

- `just test -p codex-features`
- `just test -p codex-config`
- `just test -p codex-core load_config_resolves_code_mode_config`
- `just test -p codex-core
lock_contains_prompts_and_materializes_features`
- `just test -p codex-core
excluded_deferred_namespaces_do_not_enable_nested_tool_guidance`
- `just test -p codex-core
code_mode_excludes_configured_nested_tool_namespaces`
- `cargo check -p codex-thread-manager-sample`

8b1238856b · 2026-06-04 18:40:18 +00:00

History

src

core: allow excluding tool namespaces from code mode (#26320 )

2026-06-04 18:40:18 +00:00

BUILD.bazel

Add ThreadManager sample crate (#20141 )

2026-04-29 11:21:06 -07:00

Cargo.toml

Move item event mapping into app-server-protocol (#20299 )

2026-04-30 11:02:13 -07:00

README.md

Add codex-core public API listing (#20243 )

2026-04-29 22:58:08 +00:00

README.md

ThreadManager Sample

Small one-shot binary that starts a Codex thread with ThreadManager from codex-core-api, submits a single user turn, and prints the final assistant message.

cargo run -p codex-thread-manager-sample -- "Say hello"

Use --model to override the configured default model:

cargo run -p codex-thread-manager-sample -- --model gpt-5.2 "Say hello"

The prompt can also be piped through stdin:

printf 'Say hello\n' | cargo run -p codex-thread-manager-sample