Contract-aware
Classifies tool, input, output, enum, constraint, description, and risk-annotation changes instead of showing a raw text diff.
Public beta · zero retention
MCP ContractGuard
Know whether an MCP change will break, confuse, or weaken your agents before it reaches production. Compare contracts, replay real sanitized call shapes, and receive a deterministic deployment decision.
Compare MCP contracts
Paste two tool catalogs and optionally replay sanitized calls. Nothing is stored.
Arguments are used only for in-memory schema validation and are never returned in the report. Remove real secrets before submitting.
Trace-aware
Revalidates up to 1,000 sanitized historical calls and reports affected workflows without echoing their arguments.
CI-ready output
Stable contract hashes, deterministic finding codes, and downloadable JSON or Markdown make reports suitable for deployment review.
How ContractGuard classifies changes
| Decision | Examples | Recommended action |
|---|---|---|
| BLOCK | Removed tool, new required input, type change, invalid schema, failed replay | Fix, version, or deliberately migrate callers |
| REVIEW | Description, risk annotation, reference, or unclassified schema rule change | Human review and targeted agent testing |
| PASS | No changes or compatible informational additions | Safe to proceed under the supplied evidence |