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MCP Observatory: one read only walk over every https endpoint in the official registry

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observatory.horizonshield.dev

Public record of one read only walk over the official MCP registry: who answered, tools, who pays.

https://observatory.horizonshield.dev/mcpWebsiteNo authMCP 2025-11-25v0.1.1last checked 20 Oct 2026spoke MCP on 100% of 84 checks (30 days)initialize in 257 ms

Will my client connect?

Decided from what the probe found at the endpoint, and from what each client's own documentation says it can complete. Every row carries the day that documentation was read.

✓Claude CodeConnects

The endpoint answers an anonymous handshake, so no credential is needed.

claude mcp add --transport http mcp-observatory-one-read-only-walk-over-every-https-endpoint-in-the-official-registry https://observatory.horizonshield.dev/mcp

Claude Code docs · read on 2026-08-30

✓Claude (claude.ai & Desktop)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Connectors → Add custom connector, then paste https://observatory.horizonshield.dev/mcp.

Claude (claude.ai & Desktop) docs · read on 2026-08-30

✓ChatGPTConnects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Apps → Advanced settings → Developer mode, then create a connector pointing at https://observatory.horizonshield.dev/mcp.

ChatGPT docs · read on 2026-08-30

✓CursorConnects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "mcpServers": {
    "mcp-observatory-one-read-only-walk-over-every-https-endpoint-in-the-official-registry": {
      "url": "https://observatory.horizonshield.dev/mcp"
    }
  }
}

Cursor docs · read on 2026-08-30

✓VS Code (Copilot)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "servers": {
    "mcp-observatory-one-read-only-walk-over-every-https-endpoint-in-the-official-registry": {
      "type": "http",
      "url": "https://observatory.horizonshield.dev/mcp"
    }
  }
}

VS Code (Copilot) docs · read on 2026-08-30

How to authenticate

Checked against the endpoint by our probe on 20 Oct 2026. These are the capabilities the server advertises, not a prediction about any particular client.

Scheme	No auth
Protected-resource metadata	✕Not found Without it a client has to guess where the authorization server lives.
Anonymous access	Handshake succeeds; 6 tools listable

Tools

mcp_observatory_disclosure_guidemcp_observatory_lookupmcp_observatory_measure_nowmcp_observatory_methodmcp_observatory_statemcp_observatory_summary

Contract history

5 Sep 2026v0.1.1first recorded contract

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Status badge

Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.

[![MCP status](https://mcpi.app/servers/mcp-observatory-one-read-only-walk-over-every-https-endpoint-in-the-official-registry/badge.svg)](https://mcpi.app/servers/mcp-observatory-one-read-only-walk-over-every-https-endpoint-in-the-official-registry)