citation — HTTP 503 unavailable MCP Tool
citation
(citation) is one of 31 tools on the
HTTP 503 unavailable
MCP server. Connect the server and your client discovers it on the handshake.
by client
How to call citation from your client
- Claude Code HTTP 503 unavailable citation run in your project directory
- Claude Desktop HTTP 503 unavailable citation ~/Library/Application Support/Claude/claude_desktop_config.json
- Cursor HTTP 503 unavailable citation ~/.cursor/mcp.json
- VS Code HTTP 503 unavailable citation .vscode/mcp.json
- Zed HTTP 503 unavailable citation ~/.config/zed/settings.json
- Windsurf HTTP 503 unavailable citation ~/.codeium/windsurf/mcp_config.json
- Cline HTTP 503 unavailable citation ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
- Gemini CLI HTTP 503 unavailable citation ~/.gemini/settings.json
- Grok HTTP 503 unavailable citation .mcp.json (in your project root)
- ChatGPT HTTP 503 unavailable citation Settings → Connectors → Advanced → Developer mode
- Claude.ai HTTP 503 unavailable citation Settings → Connectors → Add custom connector
- LangChain HTTP 503 unavailable citation pip install langchain-mcp-adapters
Fastest route
claude mcp add --transport http http-503 https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-503/mcpOther tools on this server
- http-503
- utc-time
- timezone
- validate-json
- normalize-url
- inspect-robots
- domain-shape
- compatibility
- status-catalog
- iana-zones
- web-fetch
- fetch-status
- github-repo-shape
- weather-hint
- memory-key-count
- file-path-ok
- browser-url-ok
- think-steps
- search-query-len
- hn-front-count
- lib-docs-hint
- playwright-url-ok
- figma-url-shape
- jira-key-shape
- geo-hint
- calc-eval
- wiki-title-ok
- agent-tool-index
- people-search-index
- agent-ads-index
This list was read from the server itself, by connecting to it and calling tools/list on 24 September 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.