AIMock by CopilotKit: One Mock Server for Your Entire Agentic Stack — LLMs, MCP, A2A, AG-UI, Vector DBs in One Package

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CopilotKit released AIMock, a zero-dependency mock server that covers the full agent protocol stack: LLMock (10 providers with streaming and tool calls), MCPMock (full JSON-RPC 2.0), A2AMock (agent card discovery and SSE routing), and VectorMock (deterministic RAG retrieval). Three killer features: Drift Detection runs daily against real APIs catching format changes within 24 hours, Record and Replay proxies real calls into CI fixtures, and Chaos Testing injects 500s and mid-stream disconnects. This solves the real problem that a single agent request in 2026 touches 6-7 services.