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

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Live behavioral security verifier, schema auditor, and trust oracle for A2A, MCP & x402 agents.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http assay-a2a-mcp-x402-pre-flight-verifier-o 'https://assay.agentdiet.dev/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "assay-a2a-mcp-x402-pre-flight-verifier-o": {
            "type": "http",
            "url": "https://assay.agentdiet.dev/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Assay — A2A & MCP Provider Assurance Observatory

Live Observatory: **https://assay-207908449630.us-central1.run.app**

Assay continuously probes remote MCP, A2A, and x402 endpoints to verify liveness, pin canonical SHA-256 tools/list schema hashes (detecting silent MCP Rug Pulls), and scan for prompt-injection tool poisoning before your agent pays or executes a tool.

MCP Endpoint

  • Streamable HTTP MCP: https://assay-207908449630.us-central1.run.app/mcp
  • Pre-Flight REST API: POST https://assay-207908449630.us-central1.run.app/v1/preflight
  • Live Leaderboard: GET https://assay-207908449630.us-central1.run.app/v1/leaderboard

Frequently asked questions

What is Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory?

Live behavioral security verifier, schema auditor, and trust oracle for A2A, MCP & x402 agents.

How do I install Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory?

It runs as a remote server. In Claude Code: claude mcp add --transport http assay-a2a-mcp-x402-pre-flight-verifier-o 'https://assay.agentdiet.dev/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory?

It is published by robertoyanguas-ops. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.