Connect MCP Observatory: one read only walk over every https endpoint in the official registry and your agent gets 6 tools, among them mcp_observatory_disclosure_guide, mcp_observatory_lookup, mcp_observatory_measure_now. It answers at https://observatory.horizonshield.dev/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 6 of 6 times since 11 September 2026; the last check, on 22 October 2026, succeeded.
Public record of one read only walk over the official MCP registry: who answered, tools, who pays.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
mcp_observatory_disclosure_guide | How the 152 servers that stated who compensates their operator actually did it - the field names observed in the wild, with counts. Not a specification we invented. |
mcp_observatory_lookup | What happened when we contacted one address, or an aggregate for one host. Returns the record hash and the procedure to recompute it. There is no tool here that lists addresses; you must already hold the one you are asking about. Inputs: address, host |
mcp_observatory_measure_now | Contact one https address now and report what we see: whether it speaks MCP, whether it carries an agent card, and whether that card names who compensates the operator. Read only; no tool is called. robots.txt is read first and honoured. Th Inputs: address |
mcp_observatory_method | How the walk was run, what we got wrong and corrected, and the four rules the report holds itself to. |
mcp_observatory_state | What was measured, when, over what population, and what the measurement cannot tell you. Read this before quoting any number from this server. |
mcp_observatory_summary | The counts, as published and as corrected. How many addresses answered, how many tools they exposed, how many stated who compensates their operator. |
Every block below points at https://observatory.horizonshield.dev/mcp. Pick your client and copy.
claude mcp add --transport http mcp-observatory-one-read-only-wa https://observatory.horizonshield.dev/mcp
{
"mcpServers": {
"mcp-observatory-one-read-only-wa": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://observatory.horizonshield.dev/mcp"]
}
}
}{
"mcpServers": {
"mcp-observatory-one-read-only-wa": {
"url": "https://observatory.horizonshield.dev/mcp"
}
}
}{
"servers": {
"mcp-observatory-one-read-only-wa": {
"type": "http",
"url": "https://observatory.horizonshield.dev/mcp"
}
}
}{
"context_servers": {
"mcp-observatory-one-read-only-wa": {
"url": "https://observatory.horizonshield.dev/mcp"
}
}
}{
"mcpServers": {
"mcp-observatory-one-read-only-wa": {
"serverUrl": "https://observatory.horizonshield.dev/mcp"
}
}
}{
"mcpServers": {
"mcp-observatory-one-read-only-wa": {
"url": "https://observatory.horizonshield.dev/mcp"
}
}
}name: MCP Observatory: one read only walk over every https endpoint in the official registry
version: 0.0.1
schema: v1
mcpServers:
- name: MCP Observatory: one read only walk over every https endpoint in the official registry
type: streamable-http
url: https://observatory.horizonshield.dev/mcp{
"mcpServers": {
"mcp-observatory-one-read-only-wa": {
"httpUrl": "https://observatory.horizonshield.dev/mcp"
}
}
}{
"mcpServers": {
"mcp-observatory-one-read-only-wa": {
"type": "http",
"url": "https://observatory.horizonshield.dev/mcp"
}
}
}{
"mcpServers": {
"mcp-observatory-one-read-only-wa": {
"url": "https://observatory.horizonshield.dev/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fobservatory.horizonshield.dev%2Fmcp&type=streamable_http&id=mcp-observatory-one-read-only-wa&name=MCP%20Observatory%3A%20one%20read%20only%20walk%20over%20every%20https%20endpoint%20in%20the%20official%20registry
It answered our last check on 22 October 2026 in 246 ms. Over 6 checks since 11 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.
6, as returned by the server's own tools/list on 17 September 2026: mcp_observatory_disclosure_guide, mcp_observatory_lookup, mcp_observatory_measure_now, mcp_observatory_method, mcp_observatory_state, mcp_observatory_summary.
It answered our last check on 22 October 2026 in 246 ms. Over 6 checks since 11 September 2026 it answered 6.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://observatory.horizonshield.dev/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: io.github.ogasurfproject-jpg. Endpoint host: observatory.horizonshield.dev. ARD identifier: urn:air:io.github.ogasurfproject-jpg:mcp:hs-mcp-observatory.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.