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MCP Tool Surface Audit
x402
MCP Tool Surface Audit is a paid API for AI agents from bounty-engineer-x402-prod.onrender.com, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-11).
Audits a list of MCP tool declarations for security risks, side-effect potential, annotation conflicts, and allowlist violations, returning severity-graded findings and a risk score.
Price / call$0.04
Success—
StatusUnknown
How this service works
Machine-buyable infrastructure for autonomous agents: API cost routing, margin optimization, funding-rate data, webpage extraction, result verification, spend controls, retry planning, state, tender search and GitHub bounty intelligence.
Output
Returns a JSON object with an ok flag, audit mode label, counts of findings by severity (critical/high/medium), an outcome recommendation (e.g. manual_review), an array of findings each containing the tool name, index, reason code, severity, and categories, a list of audit assumptions, a boolean indicating whether the MCP server was contacted, the number of evaluated tools, an inventory SHA256 hash, a charged_downstream flag, and a numeric metadata_risk_score (0–100).
Example use cases
Pre-deployment tool safety check
“Before I deploy my new agent, audit these MCP tool declarations for me: execute_shell, read_file, and send_email — flag anything that has dangerous side effects or conflicting annotations and tell me if I'm safe to ship.”
Allowlist enforcement validation
“I have a caller policy that only allows read_file and query_db — can you run a security audit on my full tool manifest and tell me which tools violate that allowlist so I can lock them down?”
Risk scoring for compliance review
“I need a metadata risk score and severity breakdown for our MCP tool inventory before our security review — here are the 15 tool declarations, please check them for side-effect risks, annotation conflicts, and anything critical.”
Technical details
Endpoint
POSThttps://bounty-engineer-x402-prod.onrender.com/v1/mcp-tool-surface-audit?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, stateless, heuristic-based security audit of MCP tool declarations without contacting any live MCP server. It is ideal for pre-deployment checks, CI/CD gates, compliance reviews, and allowlist enforcement validation. Prefer it over manual review when you have up to 100 tool declarations and need severity-graded findings with a numeric risk score in a single API call.
Side effects
- Empty tools array or more than 100 tools triggers schema validation failure
- Missing required body fields (tools, type, method, bodyType) returns 400
- Malformed tool declaration objects may be skipped or cause partial results
- Payment failure (x402) blocks the request before processing
- Tool descriptions and annotations that are absent may reduce finding accuracy
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"mode": "mcp-tool-surface-audit",
"counts": {
"high": 1,
"medium": 1,
"critical": 1
},
"outcome": "manual_review",
"findings": [
{
"tool": "execute_shell",
"index": 1,
"reason": "potential_side_effect",
"severity": "high",
"categories": [
"exec"
]
},
{
"tool": "execute_shell",
"index": 1,
"reason": "conflicting_read_only_annotation",
"severity": "critical"
},
{
"tool": "execute_shell",
"index": 1,
"reason": "tool_not_in_caller_allowlist",
"severity": "medium"
}
],
"assumptions": [
"Only caller-provided tool declarations were inspected; no MCP server was contacted.",
"Keyword signals are static heuristics, not a vulnerability scan or a tool-behavior guarantee.",
"Tool descriptions and readOnly annotations may be inaccurate; enforce authorization outside this report."
],
"server_called": false,
"evaluated_tools": 2,
"inventory_sha256": "267d493d115327ef684f5515ca6c3e6a6bdd85c6cc28c00f0d0e44592c04a216",
"charged_downstream": false,
"metadata_risk_score": 62
}
}Tags
x402
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