### What changed 1. Removed per-turn MCP selection reset in `core/src/tasks/mod.rs`. 2. Added `SessionState::set_mcp_tool_selection(Vec<String>)` in `core/src/state/session.rs` for authoritative restore behavior (deduped, order-preserving, empty clears). 3. Added rollout parsing in `core/src/codex.rs` to recover `active_selected_tools` from prior `search_tool_bm25` outputs: - tracks matching `call_id`s - parses function output text JSON - extracts `active_selected_tools` - latest valid payload wins - malformed/non-matching payloads are ignored 4. Applied restore logic to resumed and forked startup paths in `core/src/codex.rs`. 5. Updated instruction text to session/thread scope in `core/templates/search_tool/tool_description.md`. 6. Expanded tests in `core/tests/suite/search_tool.rs`, plus unit coverage in: - `core/src/codex.rs` - `core/src/state/session.rs` ### Behavior after change 1. Search activates matched tools. 2. Additional searches union into active selection. 3. Selection survives new turns in the same thread. 4. Resume/fork restores selection from rollout history. 5. Separate threads do not inherit selection unless forked.
codex-core
This crate implements the business logic for Codex. It is designed to be used by the various Codex UIs written in Rust.
Dependencies
Note that codex-core makes some assumptions about certain helper utilities being available in the environment. Currently, this support matrix is:
macOS
Expects /usr/bin/sandbox-exec to be present.
When using the workspace-write sandbox policy, the Seatbelt profile allows
writes under the configured writable roots while keeping .git (directory or
pointer file), the resolved gitdir: target, and .codex read-only.
Network access and filesystem read/write roots are controlled by
SandboxPolicy. Seatbelt consumes the resolved policy and enforces it.
Seatbelt also supports macOS permission-profile extensions layered on top of
SandboxPolicy:
- no extension profile provided:
keeps legacy default preferences read access (
user-preference-read). - extension profile provided with no
macos_preferencesgrant: does not add preferences access clauses. macos_preferences = "readonly": enables cfprefs read clauses anduser-preference-read.macos_preferences = "readwrite": includes readonly clauses plususer-preference-writeand cfprefs shm write clauses.macos_automation = true: enables broad Apple Events send permissions.macos_automation = ["com.apple.Notes", ...]: enables Apple Events send only to listed bundle IDs.macos_accessibility = true: enablescom.apple.axservermach lookup.macos_calendar = true: enablescom.apple.CalendarAgentmach lookup.
Linux
Expects the binary containing codex-core to run the equivalent of codex sandbox linux (legacy alias: codex debug landlock) when arg0 is codex-linux-sandbox. See the codex-arg0 crate for details.
All Platforms
Expects the binary containing codex-core to simulate the virtual apply_patch CLI when arg1 is --codex-run-as-apply-patch. See the codex-arg0 crate for details.