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## Summary Fixes #18524 Fixes the MCP response contract for non-`initialize` methods. Previously, `/mcp` returned initialize-style metadata for methods like `tools/list`, which caused strict MCP clients to reject the response shape. The endpoint also returned `201 Created` for RPC calls even though no resource was being created. ## Changes - return only method-specific payloads for MCP list methods - `tools/list` -> `{ tools: [...] }` - `prompts/list` -> `{ prompts: [] }` - `resources/list` -> `{ resources: [] }` - keep MCP server metadata only on `initialize` - make `/mcp` return `200 OK` instead of `201 Created` - add regression tests for: - `tools/list` response shape - `prompts/list` response shape - `resources/list` response shape ## Why Strict MCP clients expect: - standard RPC transport semantics over HTTP - method-specific JSON-RPC result payloads Returning initialize metadata for non-`initialize` methods breaks that expectation and can cause client deserialization or protocol validation failures. ## Verification - reproduced the issue locally against `/mcp` - verified `tools/list` was previously returning initialize-style fields - verified `tools/list` now returns only `result.tools` - verified `/mcp` now returns `200 OK` - ran targeted Jest tests: ```bash cd /Users/apple/MyProjects/OpenSource/twenty/packages/twenty-server npx jest --runInBand src/engine/api/mcp/services/__tests__/mcp-protocol.service.spec.ts src/engine/api/mcp/services/__tests__/mcp-tool-executor.service.spec.ts --------- Co-authored-by: Félix Malfait <felix@twenty.com>