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## Why `core/src/tools/spec.rs` still owned the pure `tool_search` and `tool_suggest` spec builders even though that logic no longer needed `codex-core` runtime state. This change continues the `codex-tools` migration by moving the reusable discovery and suggestion spec construction out of `codex-core` so `spec.rs` is left with the core-owned policy decisions about when these tools are exposed and what metadata is available. ## What changed - Added `codex-rs/tools/src/tool_discovery.rs` with the shared `tool_search` and `tool_suggest` spec builders, plus focused unit tests in `tool_discovery_tests.rs`. - Moved the shared `DiscoverableToolAction` and `DiscoverableToolType` declarations into `codex-tools` so the `tool_suggest` handler and the extracted spec builders use the same wire-model enums. - Updated `core/src/tools/spec.rs` to translate `ToolInfo` and `DiscoverableTool` values into neutral `codex-tools` inputs and delegate the actual spec building there. - Removed the old template-based description rendering helpers from `core/src/tools/spec.rs` and deleted the now-dead helper methods in `core/src/tools/discoverable.rs`. - Updated `codex-rs/tools/README.md` to document that discovery and suggestion models/spec builders now live in `codex-tools`. ## Test plan - `cargo test -p codex-tools` - `CARGO_TARGET_DIR=/tmp/codex-core-discovery-specs cargo test -p codex-core --lib tools::spec::` - `CARGO_TARGET_DIR=/tmp/codex-core-discovery-specs cargo test -p codex-core --lib tools::handlers::tool_suggest::` - `just argument-comment-lint` ## References - #16154 - #15923 - #15928 - #15944 - #15953 - #16031 - #16047 - #16129 - #16132 - #16138 - #16141
101 lines
3.6 KiB
Markdown
101 lines
3.6 KiB
Markdown
# codex-tools
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`codex-tools` is intended to become the home for tool-related code that is
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shared across multiple crates and does not need to stay coupled to
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`codex-core`.
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Today this crate is intentionally small. It currently owns the shared tool
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schema and Responses API tool primitives that no longer need to live in
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`core/src/tools/spec.rs` or `core/src/client_common.rs`:
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- `JsonSchema`
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- `AdditionalProperties`
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- `ToolDefinition`
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- `ToolSpec`
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- `ConfiguredToolSpec`
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- `ResponsesApiTool`
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- `FreeformTool`
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- `FreeformToolFormat`
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- `ToolSearchOutputTool`
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- `ResponsesApiWebSearchFilters`
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- `ResponsesApiWebSearchUserLocation`
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- `ResponsesApiNamespace`
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- `ResponsesApiNamespaceTool`
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- code-mode `ToolSpec` adapters and `exec` / `wait` spec builders
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- JS REPL spec builders
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- MCP resource, `list_dir`, and `test_sync_tool` spec builders
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- local host tool spec builders for shell/exec/request-permissions/view-image
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- collaboration and agent-job `ToolSpec` builders for spawn/send/wait/close,
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`request_user_input`, and CSV fanout/reporting
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- tool discovery and suggestion models / `ToolSpec` builders for
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`tool_search` and `tool_suggest`
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- `parse_tool_input_schema()`
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- `parse_dynamic_tool()`
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- `parse_mcp_tool()`
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- `create_tools_json_for_responses_api()`
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- `mcp_call_tool_result_output_schema()`
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- `tool_definition_to_responses_api_tool()`
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- `dynamic_tool_to_responses_api_tool()`
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- `mcp_tool_to_responses_api_tool()`
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- `mcp_tool_to_deferred_responses_api_tool()`
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- `augment_tool_spec_for_code_mode()`
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- `tool_spec_to_code_mode_tool_definition()`
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That extraction is the first step in a longer migration. The goal is not to
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move all of `core/src/tools` into this crate in one shot. Instead, the plan is
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to peel off reusable pieces in reviewable increments while keeping
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compatibility-sensitive orchestration in `codex-core` until the surrounding
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boundaries are ready.
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## Vision
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Over time, this crate should hold tool-facing primitives that are shared by
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multiple consumers, for example:
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- schema and spec data models
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- tool input/output parsing helpers
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- tool metadata and compatibility shims that do not depend on `codex-core`
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- other narrowly scoped utility code that multiple crates need
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The corresponding non-goals are just as important:
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- do not move `codex-core` orchestration here prematurely
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- do not pull `Session` / `TurnContext` / approval flow / runtime execution
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logic into this crate unless those dependencies have first been split into
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stable shared interfaces
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- do not turn this crate into a grab-bag for unrelated helper code
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## Migration approach
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The expected migration shape is:
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1. Move low-coupling tool primitives here.
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2. Switch non-core consumers to depend on `codex-tools` directly.
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3. Leave compatibility-sensitive adapters in `codex-core` while downstream
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call sites are updated.
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4. Only extract higher-level tool infrastructure after the crate boundaries are
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clear and independently testable.
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That means it is normal for `codex-core` to temporarily re-export types or
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helpers from `codex-tools` during the transition.
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## Crate conventions
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This crate should start with stricter structure than `core/src/tools` so it
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stays easy to grow:
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- `src/lib.rs` should remain exports-only.
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- Business logic should live in named module files such as `foo.rs`.
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- Unit tests for `foo.rs` should live in a sibling `foo_tests.rs`.
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- The implementation file should wire tests with:
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```rust
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#[cfg(test)]
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#[path = "foo_tests.rs"]
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mod tests;
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```
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If this crate starts accumulating code that needs runtime state from
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`codex-core`, that is a sign to revisit the extraction boundary before adding
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more here.
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