Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "assay-a2a-mcp-x402-pre-flight-verifier-observatory": {
      "type": "http",
      "url": "https://assay.agentdiet.dev/mcp"
    }
  }
}

4 tools

• assay_preflight

  Gate a remote MCP, A2A, or x402 endpoint before calling or paying it by probing live JSON-RPC reachability, hashing tools/list (SHA-256), and scanning for prompt-injection poisoning. When expected_tools_hash is provided, any mismatch against the live tools/list digest forces…

• assay_probe

  Register a new remote MCP, A2A, or x402 endpoint or refresh its public Assay Observatory dossier by running a live HTTP, agent-card, and JSON-RPC tools/list inspection without policy gating. Target must be a public HTTPS origin (private IPs are rejected with a 400 error); each…

• assay_verify_delivery

  Audit a paid x402 or A2A provider after payment to confirm delivery or prove an SLA breach with an HMAC-SHA256 signed receipt. Passing status_code >= 500 forces verdict='sla_breach_confirmed' even if the live re-probe succeeds, while passing tx_hash cryptographically binds your…

• assay_get_ledger_policy

  Retrieve historical conformance observations and manage pinned SHA-256 tools/list policy hashes in the Assay ledger for a target endpoint. When expected_tools_hash is provided, it pins that 64-hex digest as the target's baseline policy and compares it against the latest stored…

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