Bellwether

ssenone★ 1development

Open-source CLI for testing MCP servers and detecting schema drift

Install

How to run this server

[ { "cmd": "npx @mcp/your-server", "imports": [] } ]

server path: bellwether

Tools

What this server exposes

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

Configuration

Environment & auth

authnone

envMCP_SERVER_TOKEN

envOPENAI_API_KEY

envANTHROPIC_API_KEY

envOLLAMA_BASE_URL

Resources