Monitors OpenAPI spec drift and catches breaking changes before deployment. Exposes operations to diff two specs, run CI checks against a baseline, and lint for schema quality issues. Detects nine categories of breaking changes including removed endpoints, type changes, narrowed enums, and deleted response fields, plus tracks non-breaking additions for visibility. Returns structured JSON output that agents can parse, exits with status codes that block pipelines when breaking changes are found, and can validate specs for missing operation IDs or security schemes. Reach for this when you're maintaining API contracts and need automated guardrails to prevent silent breakage in downstream consumers between versions.
claude mcp add --transport stdio sethclawd-prog-schemaguard -- npx -y @sethclawd/schemaguard