Bellwether
JSON →Open-source CLI for testing MCP servers and detecting schema drift
Install
npx @mcp/your-server Tools · 12
- init Create bellwether.yaml configuration file
- check Deterministic schema drift detection
- baseline save Save snapshot for future comparisons
- baseline compare Compare latest check output to saved baseline
- explore LLM behavioral testing and AGENTS.md generation
- watch Continuous checking on file changes
- discover Capability inspection without tests
- registry Search MCP Registry
- golden Golden output regression testing
- contract Contract validation and generation
- auth Manage LLM provider API keys
- validate-config Validate bellwether.yaml without running tests
Environment variables
MCP_SERVER_TOKENOPENAI_API_KEYANTHROPIC_API_KEYOLLAMA_BASE_URL
Links
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