Spec validity
Find invalid tool names, missing schemas, duplicate tools, and broken required fields.
MCP contract intelligence
Catch the failures your happy-path demo misses.
Paste a tools/list response. Get a spec-aware contract audit in seconds. No server access, account, or source code required.
FREE CONTRACT AUDIT · LIVE NOWMonitoring is in development. Payments are not open.
- ✓ Runs in your browser
- ✓ Data stays on your device
- ✓ Stable spec: 2025-11-25
CONTRACT SCORE
68/100
Invalid input schemadeploy_app · required field is not defined
BLOCKERMutation has no safety hintsdelete_record · annotations missing
RISKTool names are portable12 of 12 names pass stable guidance
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FREE CONTRACT AUDIT
Paste. Audit. Fix.
Use an array of tools, a { "tools": [...] } object, or a complete JSON-RPC response.
tools-list.json
Results appear here
Run the example to see each finding and its recommended fix.
WHAT WE CHECK
A linter for the interface your agents actually see.
MCP clients plan from names, descriptions, and JSON Schema. Small contract defects can cause large behavior changes.
Agent clarity
Flag vague descriptions, undocumented inputs, and duplicate language that can confuse tool selection.
Safety signals
Identify tools that appear to change state but omit behavior annotations and clear boundaries.
Output contracts
Show where structured output can make results easier to validate and safer to consume.
COMING NEXT
Know when a harmless deploy breaks an agent.
MCP Check will snapshot each contract, compare every release, and alert your team before clients fail.
- → GitHub pull request checks
- → Scheduled remote contract scans
- → Breaking-change severity
- → Slack and email alerts
PLANNED BETA PRICE
$39/ month
This planned plan will include five monitored servers and unlimited local audits.
Join monitoring betaPayments are not open. No card is collected today.MONITORING BETA
Join the monitoring beta.
We will send access when monitoring opens. This form does not take payment.