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## Why The MCP tool path had accumulated a few core-owned special cases: a dedicated payload variant, resolver plumbing, a legacy `AfterToolUse` translation path, and a side channel for parallel-call metadata. That made `ToolRegistry` and the spec builder know more about MCP than they needed to. This change moves MCP-specific execution details back onto `ToolInfo` and `McpHandler` so `codex-core` can treat MCP calls like normal function calls while still preserving MCP-specific dispatch and telemetry behavior where it belongs. ## What changed - removed `resolve_mcp_tool_info`, `ToolPayload::Mcp`, `ToolKind`, and the remaining registry-side MCP resolver path - stored MCP routing metadata directly on `McpHandler` and `ToolInfo`, including `supports_parallel_tool_calls` - deleted the legacy `AfterToolUse` consumer in `core`, which removes the need for handler-specific `after_tool_use_payload` implementations - switched tool-result telemetry to handler-provided tags and kept MCP-specific dispatch payload construction inside the handler - simplified tool spec planning/building by passing `ToolInfo` directly and dropping the direct/deferred MCP wrapper structs and the parallel-server side table ## Testing - `cargo check -p codex-core -p codex-mcp -p codex-otel` - `cargo test -p codex-core mcp_parallel_support_uses_exact_payload_server` - `cargo test -p codex-core direct_mcp_tools_register_namespaced_handlers` - `cargo test -p codex-core search_tool_description_lists_each_mcp_source_once` - `cargo test -p codex-mcp list_all_tools_uses_startup_snapshot_while_client_is_pending` - `just fix -p codex-core -p codex-mcp -p codex-otel`