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## Why `codex-tools` already owns the shared tool input schema model and parser from the first extraction step, but `core/src/tools/spec.rs` still owned the MCP-specific adapter that normalizes `rmcp::model::Tool` schemas and wraps `structuredContent` into the call result output schema. Keeping that adapter in `codex-core` means the reusable MCP schema path is still split across crates, and the unit tests for that logic stay anchored in `codex-core` even though the runtime orchestration does not need to move yet. This change takes the next small step by moving the reusable MCP schema adapter into `codex-tools` while leaving `ResponsesApiTool` assembly in `codex-core`. ## What changed - added `tools/src/mcp_tool.rs` and sibling `tools/src/mcp_tool_tests.rs` - introduced `ParsedMcpTool`, `parse_mcp_tool()`, and `mcp_call_tool_result_output_schema()` in `codex-tools` - updated `core/src/tools/spec.rs` to consume parsed MCP tool parts from `codex-tools` - removed the now-redundant MCP schema unit tests from `core/src/tools/spec_tests.rs` - expanded `codex-rs/tools/README.md` to describe this second migration step ## Test plan - `cargo test -p codex-tools` - `cargo test -p codex-core --lib tools::spec::`
74 lines
2.5 KiB
Markdown
74 lines
2.5 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 primitives that no longer need to live in `core/src/tools/spec.rs`:
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- `JsonSchema`
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- `AdditionalProperties`
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- `parse_tool_input_schema()`
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- `ParsedMcpTool`
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- `parse_mcp_tool()`
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- `mcp_call_tool_result_output_schema()`
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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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