codex/codex-rs/tools

codex-tools

codex-tools is intended to become the home for tool-related code that is shared across multiple crates and does not need to stay coupled to codex-core.

Today this crate is intentionally small. It currently owns the shared tool schema and Responses API tool primitives that no longer need to live in core/src/tools/spec.rs or core/src/client_common.rs:

• JsonSchema
• AdditionalProperties
• ToolDefinition
• ToolSpec
• ConfiguredToolSpec
• ResponsesApiTool
• FreeformTool
• FreeformToolFormat
• ToolSearchOutputTool
• ResponsesApiWebSearchFilters
• ResponsesApiWebSearchUserLocation
• ResponsesApiNamespace
• ResponsesApiNamespaceTool
• code-mode ToolSpec adapters and exec / wait spec builders
• JS REPL spec builders
• MCP resource, list_dir, and test_sync_tool spec builders
• local host tool spec builders for shell/exec/request-permissions/view-image
• collaboration and agent-job ToolSpec builders for spawn/send/wait/close, request_user_input, and CSV fanout/reporting
• tool discovery and suggestion models / ToolSpec builders for tool_search and tool_suggest
• parse_tool_input_schema()
• parse_dynamic_tool()
• parse_mcp_tool()
• create_tools_json_for_responses_api()
• mcp_call_tool_result_output_schema()
• tool_definition_to_responses_api_tool()
• dynamic_tool_to_responses_api_tool()
• mcp_tool_to_responses_api_tool()
• mcp_tool_to_deferred_responses_api_tool()
• augment_tool_spec_for_code_mode()
• tool_spec_to_code_mode_tool_definition()

That extraction is the first step in a longer migration. The goal is not to move all of core/src/tools into this crate in one shot. Instead, the plan is to peel off reusable pieces in reviewable increments while keeping compatibility-sensitive orchestration in codex-core until the surrounding boundaries are ready.

Vision

Over time, this crate should hold tool-facing primitives that are shared by multiple consumers, for example:

• schema and spec data models
• tool input/output parsing helpers
• tool metadata and compatibility shims that do not depend on codex-core
• other narrowly scoped utility code that multiple crates need

The corresponding non-goals are just as important:

• do not move codex-core orchestration here prematurely
• do not pull Session / TurnContext / approval flow / runtime execution logic into this crate unless those dependencies have first been split into stable shared interfaces
• do not turn this crate into a grab-bag for unrelated helper code

Migration approach

The expected migration shape is:

1. Move low-coupling tool primitives here.
2. Switch non-core consumers to depend on codex-tools directly.
3. Leave compatibility-sensitive adapters in codex-core while downstream call sites are updated.
4. Only extract higher-level tool infrastructure after the crate boundaries are clear and independently testable.

That means it is normal for codex-core to temporarily re-export types or helpers from codex-tools during the transition.

Crate conventions

This crate should start with stricter structure than core/src/tools so it stays easy to grow:

• src/lib.rs should remain exports-only.
• Business logic should live in named module files such as foo.rs.
• Unit tests for foo.rs should live in a sibling foo_tests.rs.
• The implementation file should wire tests with:

#[cfg(test)]
#[path = "foo_tests.rs"]
mod tests;

If this crate starts accumulating code that needs runtime state from codex-core, that is a sign to revisit the extraction boundary before adding more here.