aimock: Deterministic Mock Infra for AI Apps

aimock is an open-source, MIT-licensed mock server from CopilotKit designed to make testing AI applications faster, offline, and deterministic by replacing live calls to LLMs and related services with JSON-based fixtures. Developers can redirect existing API endpoints to a local server without modifying their applications or SDKs, avoiding token costs, API-key requirements, provider outages, and inconsistent test results. The tool supports a broad range of providers and services, including major LLM platforms, MCP and A2A protocols, vector databases, multimedia models, search, reranking, and moderation APIs. Recent additions include record-and-replay of production API traffic, drift detection for changing provider response formats, chaos testing for failures and latency, and expanded agentic-protocol support. The post reports more than one million weekly installs and adoption by projects including OpenClaw, TanStack, Mastra, and AG-UI, while also highlighting CopilotKit’s related Channels SDK for deploying AG-UI agents across Slack, Teams, and other messaging platforms.

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