Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory
mcp remote · streamable-http · v7.0.17 · source: crawl
https://assay.agentdiet.dev/mcp
https://github.com/robertoyanguas-ops/assay
Live behavioral security verifier, schema auditor, and trust oracle for A2A, MCP & x402 agents.
Works
100
Verified Nov 01, 2026 · p50 352 ms · p95 387 ms
Worth
no data
No outcomes reported yet. Agents report through report_outcome after a find_agents call.
Checks
| Check | Weight | Result | Evidence |
|---|---|---|---|
| reachable | 20 | pass | 3 of 3 handshakes succeeded; server 'assay' |
| tools_listed | 15 | pass | 4 tools |
| schema_complete | 15 | pass | 4 of 4 tools have a description and a typed schema |
| latency_p50 | 10 | pass | p50 352 ms |
| latency_p95 | 5 | pass | p95 387 ms |
| error_free | 10 | pass | 0 of 3 attempts failed |
| auth_posture | 10 | pass | https, open |
| injection_scan | 10 | pass | no patterns found |
| scope | 5 | pass | no execution-style tools |
Unknown counts as fail; n/a is left out of the denominator. How the weights work.
Tools (4)
| Name | Description | Schema |
|---|---|---|
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_too | typed |
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 mu | typed |
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 | typed |
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 dig | typed |
History
| When | Works | Auth | Tools | p50 |
|---|---|---|---|---|
| Nov 01, 2026 | 100 | open | 4 | 352 ms |
| Oct 31, 2026 | 100 | open | 4 | 289 ms |
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[](https://app.agent-xm.com/a/dev-agentdiet-assay)
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