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Pass the base (old) and revision (new) specs as YAML or JSON; returns the breaking and warning-level changes. Use this when the question is whether an API change breaks existing clients. Use oasdiff_changelog instead to list every change including non-breaking and informational ones, oasdiff_diff for the raw added/removed/modified structure, or oasdiff_validate to check a single spec rather than compare two. 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Both specs must be valid, self-contained OpenAPI (external $ref URLs or files are not resolved).","write_action":false,"price_micros":0,"input_schema":{"type":"object","properties":{"base":{"type":"string","description":"the base (old) OpenAPI specification, as YAML or JSON"},"revision":{"type":"string","description":"the revision (new) OpenAPI specification, as YAML or JSON"}},"required":["base","revision"],"additionalProperties":false}},{"name":"oasdiff_diff","description":"Show the structural diff between two OpenAPI specifications (base vs revision): what was added, removed, or modified. Pass both specs as YAML or JSON. Use this when you want the raw structural changes rather than a backward-compatibility verdict. Use oasdiff_breaking_changes to judge whether changes break clients, or oasdiff_changelog for a severity-classified changelog. 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The spec must be self-contained (external $ref URLs or files are not resolved).","write_action":false,"price_micros":0,"input_schema":{"type":"object","properties":{"spec":{"type":"string","description":"the OpenAPI specification to validate, as YAML or JSON"}},"required":["spec"],"additionalProperties":false}}],"scan":{"score":67,"grade":"C","scanned_at":"2026-09-26T21:23:31.853Z","report":{"scannerVersion":"0.1.9","scannedAt":"2026-09-26T21:23:31.846Z","components":{"code":{"score":-1,"max":25,"notes":["remote-only server, no package to scan"]},"reliability":{"score":20,"max":20,"notes":["remote reachable in 579ms"]},"poisoning":{"score":15,"max":15,"notes":["4 tool descriptions checked"]},"auth":{"score":10,"max":15,"notes":["open endpoint, read-only tools"]},"maintenance":{"score":3,"max":15,"notes":["no repository listed"]},"identity":{"score":2,"max":10,"notes":["no repository or website to verify"]}},"findings":[{"id":"maint.no-repo","severity":"low","component":"maintenance","title":"No source repository listed"}],"inputs":{"probes":[{"url":"https://api.oasdiff.com/mcp","reachable":true,"authRequired":false,"latencyMs":579,"serverInfo":{"name":"oasdiff","version":"1.0.0"}}],"packages":[],"repo":{"found":false},"icon":{"url":null,"source":"none"},"presence":{"stars":null,"forks":null,"downloadsWeek":null,"license":null,"lastPushAt":null,"score":5}}}},"grade_history":[],"reviews":[]}