Tools, resources, prompts
Track names, descriptions, schemas, URIs, arguments, and protocol metadata.
MCP testing · contracts
Turn a live MCP server into a reviewable contract.
Inspect and test tools, resources, prompts, schemas, metadata, and expected outputs. Prooflane automates quality checks and classifies drift as identical, non-breaking, or breaking so interface changes become deliberate.
stdio + HTTPJSON + YAMLCI exit codes
payments.mcp · capability diff
$ prooflane diff baseline.kawach tools 14 → 15 non-breaking resources 3 → 3 identical prompts 4 → 4 identical + tool payments.refund_preview ~ schema payments.charge required field added: idempotency_key FAIL · 1 breaking schema change
Contract coverage
Protect discovery and behavior together.
Capability drift reveals surface changes; response contracts reveal behavior changes.
Expected tool output
Snapshot representative calls and compare normalized content with stable paths and assertions.
Breaking-aware diffs
Separate additive changes from removed capabilities, new required fields, and incompatible types.
Reviewable artifacts
Commit readable JSON or YAML contracts next to the application that depends on them.
Generated tests
Turn snapshots into Jest, pytest, REST Assured, or native Prooflane tests.
Regression gates
Emit JSON and annotations so pull requests explain exactly what changed.
Workflow
A contract loop for every MCP release.
Connect
Discover the live protocol surface through stdio or streamable HTTP.
Capture
Save capabilities, representative inputs, outputs, and assertions.
Review
Commit the baseline and review intentional interface evolution.
Gate
Diff live behavior and fail CI only when policy says the change breaks consumers.
prooflane snapshot --all .prooflane/payments.kawach prooflane diff .prooflane/payments.kawach --github
Part of the spine
A stable interface strengthens every other test.
Local-first foundation
Make MCP changes observable.
Capture the contract once, then keep every dependent agent honest.
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