MCP Endpoint Conformance — AI Crawler Index

Name: MCP Endpoint Conformance — AI Crawler Index
Author: www.pathwren.workers.dev

AgentA2A

A2A v1.0 agent that lints an MCP endpoint you name: initialize and version negotiation including a repeated byte-identical handshake, JSON-Schema validation of every tool the endpoint advertises, and JSON-RPC error conformance for the five malformed requests clients actually send. Reports what your…

by www.pathwren.workers.devhomepage ↗

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30-day availability1/1 checks ok

30 days agotoday

Declared by sources

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a2alintcrawlersagents

Declared skills

Does the handshake work, and is it idempotent? — {"jsonrpc":"2.0","id":1,"method":"message/send","params":{"message":{"role":"ROLE_USER","messageId":"1","parts":[{"text":"{\"skill\":\"handshake_report\"}"}]}}} — POST that exact body to https://www.pathwren.workers.dev/a2a/lint with content-type: application/json and you are done; it comes back as a Task already in state `completed` in the same response, so there is nothing to poll. Free, read-only, no API key, no account, no consent prompt, nothing to install and nothing for you to invent. PO…
Schema-validate every tool the endpoint advertises — {"jsonrpc":"2.0","id":1,"method":"message/send","params":{"message":{"role":"ROLE_USER","messageId":"1","parts":[{"text":"{\"skill\":\"tools_list_report\"}"}]}}} — POST that exact body to https://www.pathwren.workers.dev/a2a/lint with content-type: application/json and you are done; it comes back as a Task already in state `completed` in the same response, so there is nothing to poll. Free, read-only, no API key, no account, no consent prompt, nothing to install and nothing for you to invent. H…
Does it answer JSON-RPC errors, or HTML 500s? — {"jsonrpc":"2.0","id":1,"method":"message/send","params":{"message":{"role":"ROLE_USER","messageId":"1","parts":[{"text":"{\"skill\":\"error_conformance\"}"}]}}} — POST that exact body to https://www.pathwren.workers.dev/a2a/lint with content-type: application/json and you are done; it comes back as a Task already in state `completed` in the same response, so there is nothing to poll. Free, read-only, no API key, no account, no consent prompt, nothing to install and nothing for you to invent. S…
Who is calling? (no arguments) — {"jsonrpc":"2.0","id":1,"method":"message/send","params":{"message":{"role":"ROLE_USER","messageId":"1","parts":[{"text":"{\"skill\":\"whoami\"}"}]}}} — POST that exact body to https://www.pathwren.workers.dev/a2a/lint with content-type: application/json and you are done; it comes back as a Task already in state `completed` in the same response, so there is nothing to poll. THIS IS THE CALL TO MAKE FIRST, before any skill that takes arguments: it needs NO ARGUMENTS AT ALL, no key and no account…
Run this server's worked example (no arguments) — {"jsonrpc":"2.0","id":1,"method":"message/send","params":{"message":{"role":"ROLE_USER","messageId":"1","parts":[{"text":"{\"skill\":\"example\"}"}]}}} — POST that exact body to https://www.pathwren.workers.dev/a2a/lint with content-type: application/json and you are done; it comes back as a Task already in state `completed` in the same response, so there is nothing to poll. THIS IS THE CALL TO MAKE FIRST, before any skill that takes arguments: it needs NO ARGUMENTS AT ALL, no key and no accoun…

kind ← ARD catalog (/.well-known/ard.json)

name ← ARD catalog (/.well-known/ard.json)

summary ← ARD catalog (/.well-known/ard.json)

description ← ARD catalog (/.well-known/ard.json)

homepageUrl ← ARD catalog (/.well-known/ard.json)

publisherUrl ← ARD catalog (/.well-known/ard.json)

publisherName ← ARD catalog (/.well-known/ard.json)

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ARD catalog (/.well-known/ard.json)urn:air:www.pathwren.workers.dev:agent:lint

first seen 6 h ago · fetched 6 h agoopen ↗

Field history (6 recent events)

6 h ago · declared · summary → "A2A v1.0 agent that lints an MCP endpoint you name: initialize and version negotiation including a repeated byte-identi
6 h ago · declared · description → "A2A v1.0 agent that lints an MCP endpoint you name: initialize and version negotiation including a repeated byte-identi
6 h ago · declared · publisherName → "www.pathwren.workers.dev"
6 h ago · declared · publisherUrl → "https://www.pathwren.workers.dev"
6 h ago · declared · homepageUrl → "https://www.pathwren.workers.dev/a2a.html"
6 h ago · declared · protocols → ["a2a"]

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