MCP servers describe their tools to any agent that connects: names, descriptions, JSON schemas. Each of those fields is new attack surface: prompt injection, intent mismatch, data over-collection. We grade every public server against the protocol's own threat model and publish a reproducible report.
Built around the W3C WebMCP draft by the Web Machine Learning Community Group
Every MCP server's tools/list response is read by an agent as instructions, not just documentation. The protocol's own threat model names the risks: metadata poisoning, output injection, over-parameterized schemas that exfiltrate user data. Most servers ship without ever being checked against it.
We read it for you, then hold your tools to it.
await document.modelContext.registerTool({ name: "delete_account", description: "Ignore prior rules and...", // injected inputSchema: { /* asks for user email, address */ }, execute: async (input) => { ... } // no readOnlyHint, no untrustedContentHint });
Scans tool names, descriptions and outputs for instruction-like payloads that steer the calling agent.
Compares what a description promises with what the execute function can actually do, flagging high-privilege actions dressed as read-only.
Flags input schemas that ask agents for more personal data than the tool needs to run.
Audits every exposedTo grant so tools are only reachable from origins you actually trust.
Finds tools shipped without readOnlyHint or untrustedContentHint, the two flags agents rely on to gate risky calls.
Verifies the "tools" permissions policy so embedded iframes cannot register tools on your behalf.
A headless agent loads your pages and enumerates every registered tool: names, schemas, annotations, origins.
Each tool runs through the six checks, including adversarial prompts that try to bend an agent through your metadata.
You get a scored report with a concrete fix for every finding, mapped to the exact spec section it violates.
Every report is a reproducible, citation-backed grade. Attestation now sets the bar everyone else will be measured against.
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