Evidence row 23578

What was observed

{
  "endpoints": [
    [
      "mcp",
      "https://www.pathwren.workers.dev/c/mcp-registry-official/mcp/lint"
    ],
    [
      "web",
      "https://www.pathwren.workers.dev/c/mcp-registry-official/mcp-lint.html"
    ]
  ],
  "name": "MCP Endpoint Lint - handshake, tool schemas, JSON-RPC errors",
  "owner_address": null,
  "raw": {
    "_meta": {
      "io.modelcontextprotocol.registry/official": {
        "isLatest": true,
        "publishedAt": "2026-09-07T00:44:27.395557Z",
        "status": "active",
        "statusChangedAt": "2026-09-07T00:44:27.395557Z",
        "updatedAt": "2026-09-07T00:44:27.395557Z"
      }
    },
    "server": {
      "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
      "_meta": {
        "io.modelcontextprotocol.registry/publisher-provided": {
          "auth": "none",
          "authentication": "none - no key, no account, no OAuth",
          "dataLicense": "CC0-1.0",
          "docs": "https://www.pathwren.workers.dev/c/mcp-registry-official/mcp.html",
          "example": {
            "curl": "curl -s -X POST https://www.pathwren.workers.dev/c/mcp-registry-official/mcp/lint -H 'content-type: application/json' -H 'accept: application/json, text/event-stream' -d '{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"tools/call\",\"params\":{\"name\":\"whoami\",\"arguments\":{}}}'",
            "endpoint": "https://www.pathwren.workers.dev/c/mcp-registry-official/mcp/lint",
            "note": "whoami takes no arguments at all and answers about the request you just sent - user-agent, address, what our classifier makes of it. Every tool here accepts {} and answers with its own documented worked example, run against a built-in fixture: no outbound request is made and no third party is touched. Send the request below verbatim. To lint a real endpoint, pass your own url - this server fetches the URL you give it, and only that.",
            "request": {
              "id": 1,
              "jsonrpc": "2.0",
              "method": "tools/call",
              "params": {
                "arguments": {},
                "name": "whoami"
              }
            },
            "transport": "streamable-http"
          },
          "keywords": [
            "mcp",
            "lint",
            "validator",
            "conformance",
            "health check",
            "monitoring",
            "json-rpc",
            "json schema",
            "protocol version",
            "streamable http",
            "oauth-protected-resource",
            "rfc 9728",
            "discovery",
            "score card",
            "markdown",
            "markdown docs",
            "free",
            "no api key",
            "no auth"
          ],
          "markdown": {
            "canonical": "the HTML page; each mirror carries Link: rel=\"canonical\" back to it",
            "example": "curl -s https://www.pathwren.workers.dev/c/mcp-registry-official/mcp-lint.md",
            "index": "https://www.pathwren.workers.dev/c/mcp-registry-official/sitemap.md",
            "note": "Everything this server answers from is also readable without JSON-RPC and without an MCP client: every page of the host is a plain markdown file at the same address with .md — also .mdx, <page>.html.md, <page>.html.mdx, or send Accept: text/markdown to the .html page. No key, no JavaScript, CC0. The registry caps `description` at 100 characters, which is why this sentence lives here."
          },
          "outbound_requests": {
            "makes_them": true,
            "only_to": "the URL supplied by the caller in the tool arguments",
            "rate_limited": "per caller, per target host, and per edge location",
            "refuses": "its own publisher, ephemeral tunnel and preview hostnames, IP literals, private names, URLs carrying credentials, non-HTTP schemes and unusual ports - before any socket is opened",
            "storage": "none - a caller's URL is never written to a database, a log line or a metric",
            "timeout_ms": 6000,
            "user_agent": "growth-loop/1.0 (+https://www.pathwren.workers.dev/mcp-lint.html)",
            "zero_argument_calls": "run against a built-in fixture and make no outbound request at all"
          },
          "pricing": "free",
          "publisher": "Pathwren - an independent, non-commercial automated project",
          "tools": [
            {
              "name": "handshake_report",
              "search": "does this MCP endpoint's initialize work, and is it idempotent"
            },
            {
              "name": "tools_list_report",
              "search": "schema-validate every tool an MCP endpoint advertises"
            },
            {
              "name": "error_conformance",
              "search": "does it answer -32601/-32602, or an HTML 500"
            },
            {
              "name": "discovery_report",
              "search": "what an MCP client looks for before it dials, and what answered"
            },
            {
              "name": "score_card",
              "search": "score an MCP endpoint out of 100 in one call"
            },
            {
              "name": "whoami",
              "search": "who is calling - no arguments"
            },
            {
              "name": "example",
              "search": "run the worked example - no arguments"
            }
          ]
        }
      },
      "description": "{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"tools/call\",\"params\":{\"name\":\"whoami\",\"arguments\":{}}} free no key",
      "icons": [
        {
          "mimeType": "image/png",
          "sizes": [
            "256x256"
          ],
          "src": "https://www.pathwren.workers.dev/c/mcp-registry-official/icon.png"
        }
      ],
      "name": "dev.workers.pathwren.www/mcp-endpoint-lint",
      "remotes": [
        {
          "type": "streamable-http",
          "url": "https://www.pathwren.workers.dev/c/mcp-registry-official/mcp/lint"
        }
      ],
      "title": "MCP Endpoint Lint - handshake, tool schemas, JSON-RPC errors",
      "version": "1.3.0",
      "websiteUrl": "https://www.pathwren.workers.dev/c/mcp-registry-official/mcp-lint.html"
    }
  },
  "source": "mcp_registry",
  "summary": "{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"tools/call\",\"params\":{\"name\":\"whoami\",\"arguments\":{}}} free no key"
}

What the leaf hashes

{"body":"794f3bb0b589d31504f8de1c090e09b3c16184f83c17d79847cea6181151dbe8","id":23578,"kind":"listing","method":"baseline/1","observed_us":1793025351228121,"prev":null,"subject":"mcp_registry:dev.workers.pathwren.www/mcp-endpoint-lint","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0xf1195251c886c1c7e333435733fa7c3f03b105c395e8f9c4d9f3da9c4c2aff8b
2. 0x6514e9754080974f0b96aec7e828b93f938e61d096a8db615aa71830501fab7f
3. 0x32e2a31693aece156c1423b1a7ecb3e9017de890438d9582776ac5212d9d973d
4. 0xadb2350b6ad040dfc6564fcf23a442c88379fa6061c1dc6254da70065c0d89e4
5. 0x0a60790043055c62772a570fcd1f6fb8900521a362d4fee6e61caeed42a09f88
6. 0x2ef52a65099ba0713d567ed37492d3b10c93ce5de817a74d64f39cfb39fe0e7f
7. 0xe71cd2e75d6c23ecca088751ef318d615481d62def2cf5ed357a846a5b1341dd
8. 0x82bc795b037532f991928ae7a49f5e58910b366d0c74877746c292b3fee6fea7
9. 0xc3596fbad3e4207c4410d395b8a81b3dc359044751f1caefc61e494d58d39d1a
10. 0x7d04371228279440387b9131e1ecd711e15d7ec89ef830b07659d5cf6474b401
11. 0x514d76e971925e71327eba8800da6dbdf3c60a7c174890b0694dc64fd775ac72
12. 0x4d2e94451b5ffc570a23dee9d1525bc305f1009994ffe23d8e2e7d45c60f6209
13. 0xa26f0437cba4d7d64f1cf98bf4f490e1ebb6f66a5e2331537b7ba8b3061084e0
14. 0xd769d41500075835c3b2f9184d223699fb983fd05c29fbcb44d964abc7ee380d
15. 0x68d296b1e00b4899fb83c3fba36fffaefa311eac2903067dbebfe776a12b4a9a
16. 0x5fb5dda563336cd1bc1b9f44c52b76237ae72ed2145cb9290f39f304ca7dd678
17. 0x74a0a08e4e7ab9aa5bfbead33dec7e1c7e8e364cff69a63720d764bbe987aadc

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae