mcptest.io

Remote MCP Inspector

MCP breaking-change check

Will this deploy break the agents that already use your server? Compare two tools/list results and every difference is classified as breaking, risky or safe for clients that cached the old listing, with the reason.

Pasted payloads never leave your browser. Read which MCP tool changes break clients for the rules and how to ship changes safely.

Compare

What to compare

A tools/list result or the whole JSON-RPC response; add prompts and resources to compare them too.

A tools/list result or the whole JSON-RPC response; add prompts and resources to compare them too.

Publish a report and enable Watch weekly to get free Slack, Discord, or HTTPS webhook alerts for breaking and risky changes. Configure one destination in Published history with your removal token. Learn about weekly alerts.