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## Why This is another small step in the `codex-core` -> `codex-tools` migration described in `AGENTS.md`. `core/src/tools/spec.rs` and `core/src/tools/code_mode/mod.rs` were both hand-rolling the same pure transformation: convert visible `ToolSpec`s into code-mode nested tool definitions, then sort and deduplicate by tool name. That logic does not depend on core runtime state or handlers, so keeping it in `codex-core` makes `spec.rs` harder to peel out later than it needs to be. ## What Changed - Add `collect_code_mode_tool_definitions()` to `codex-rs/tools/src/code_mode.rs`. - Reuse that helper from `codex-rs/core/src/tools/spec.rs` when assembling the `exec` tool description. - Reuse the same helper from `codex-rs/core/src/tools/code_mode/mod.rs` when exposing nested tool metadata to the code-mode runtime. This is intended to be a straight refactor with no behavior change and no new test surface. ## Verification - `cargo test -p codex-tools` - `cargo test -p codex-core tools::spec::tests` - `cargo test -p codex-core code_mode_only_`