MCP server · HORIZON SHIELD

horizonshield-dev-mcp.yml

HORIZON SHIELD operates a FAMILY of remote MCP servers on subdomains of horizonshield.dev (the apex resolves to nothing; see well-known/). The flagship is https://mcp.horizonshield.dev/ — POST-only Streamable HTTP, MCP protocol 2025-06-18, serverInfo {horizon-shield, 1.0.9}, anonymous. It answered initialize, tools/list (15 tools, every one with inputSchema AND outputSchema and readOnly/destructive/openWorld annotations), prompts/list (5 prompts) and ping without any credential; resources/list returns -32601. GET on / , /mcp and /sse returns a deliberate 405 whose JSON body explains the transport, lists the tools and known paths, and dates the retirement of the legacy SSE path (2026-08-14). The same JSON-RPC URL also answers A2A message/send (see a2a/). Authorship is the provider's own: tool names, bilingual JP/EN descriptions, the JCCDB dataset, the PTKA receipt model and the AP2 attestation bridge match no shared platform fingerprint, and the source is public at github.com/ogasurfproject-jpg/horizon-shield (workers/hs-mcp). Five sibling servers (gate, JIDEC, WebMCP intake, Yakumo, femtech) were probed the same way and are recorded below with their tool lists saved verbatim.

Open endpoint → HORIZON SHIELD provider profile

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Provider: HORIZON SHIELD Type: Hosted endpoint Transport: streamable-http Host: mcp.horizonshield.dev

Endpoint

https://mcp.horizonshield.dev

Hosted endpoint · transport streamable-http

Connect

This is a remote MCP server — point an MCP client at the endpoint URL. Clients with native remote support (Claude, Cursor, VS Code, …):

# mcp client config (e.g. .mcp.json / mcp settings) { "mcpServers": { "horizonshield-dev": { "url": "https://mcp.horizonshield.dev" } } }

For stdio-only clients (older Claude Desktop, etc.), bridge with mcp-remote:

# Add to claude_desktop_config.json { "mcpServers": { "horizonshield-dev": { "command": "npx", "args": ["-y", "mcp-remote", "https://mcp.horizonshield.dev"] } } }

If the server requires authentication, add the provider's token/header (e.g. an X-API-Key) per its docs. A quick reachability check:

curl -i -X POST https://mcp.horizonshield.dev \ -H "Content-Type: application/json" -H "Accept: application/json, text/event-stream" \ -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

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