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Forest Agent Tools – MCP Contract Check
x402
Forest Agent Tools – MCP Contract Check is a paid API for AI agents from http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-20).
Inspects a public MCP HTTP endpoint, auto-detects protocol version, and returns a deterministic SHA-256 contract fingerprint of its tools/list schema without invoking any tools
Price / call$0.004
Success—
StatusUnknown
How this service works
Machine-readable contract for active Forest paid capabilities. Unsigned paid calls return HTTP 402 with a PAYMENT-REQUIRED x402 challenge.
Output
Returns a deterministic SHA-256 hash fingerprinting the normalized tools/list schema of the target MCP endpoint, along with the detected protocol version (stateless 2026-07-28 era or legacy initialize lifecycle) and the raw normalized schema. No tools are invoked and no authentication is attempted.
Example use cases
MCP schema drift monitoring
“Check whether the MCP endpoint at https://tools.mycompany.com/mcp has the same contract fingerprint it had last week — I want to know if any tools were added or removed without my knowing.”
Protocol version compatibility audit
“Inspect the MCP server at https://agent-backend.acme.io/mcp using protocol version 2026-07-28 and tell me if it supports the stateless lifecycle or falls back to the legacy initialize flow.”
Pre-integration tool schema validation
“Before I wire up this third-party MCP server at https://api.partner.dev/mcp into my agent pipeline, can you pull its tools/list contract fingerprint so I know exactly what capabilities it advertises?”
Technical details
Endpoint
POSThttps://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/mcp/contract-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a cheap, safe, read-only fingerprint of an MCP server's tool contract without risking any side effects from tool invocation. Ideal for change detection pipelines, pre-integration audits, and protocol compatibility checks. Prefer it over manual inspection when you want a deterministic, repeatable hash suitable for diffing across time or deployments.
Side effects
- Target URL is unreachable or returns non-2xx — endpoint reports connection failure
- MCP endpoint does not conform to any recognized protocol version — fingerprint cannot be produced
- URL fails pattern validation (must start with http:// or https://) — request rejected client-side
- Target server requires authentication — Forest cannot inspect gated endpoints
- protocol_version field exceeds 32 characters — request rejected
- MCP server responds with malformed JSON — normalization fails
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public HTTP(S) URL to inspect, resolve, or compare. |
| protocol_version | string | Public protocol version value used to scope this lookup. |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"data": {
"url": "example",
"scope": "mcp_protocol_discovery_and_tools_schema_contract_only",
"tools": [],
"warnings": [],
"reachable": false,
"transport": "http-jsonrpc",
"truncated": false,
"latency_ms": 0,
"tool_count": 0,
"tools_hash": "0000000000000000000000000000000000000000000000000000000000000000",
"capabilities": [],
"protocol_era": "modern",
"schema_valid": false,
"auth_required": false,
"protocol_version": "example",
"invalid_tool_count": 0
},
"meta": {
"cache": "miss",
"provider": "mcp-contract",
"checked_at": "2026-01-01T00:00:00.000Z",
"duration_ms": 0
},
"version": "1",
"capability": "mcp.contract-check"
}
}Tags
x402
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