citation — Utility 139 MCP Tool
citation
(citation) is one of 31 tools on the
Utility 139
MCP server. Connect the server and your client discovers it on the handshake.
by client
How to call citation from your client
- Claude Code Utility 139 citation run in your project directory
- Claude Desktop Utility 139 citation ~/Library/Application Support/Claude/claude_desktop_config.json
- Cursor Utility 139 citation ~/.cursor/mcp.json
- VS Code Utility 139 citation .vscode/mcp.json
- Zed Utility 139 citation ~/.config/zed/settings.json
- Windsurf Utility 139 citation ~/.codeium/windsurf/mcp_config.json
- Cline Utility 139 citation ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
- Gemini CLI Utility 139 citation ~/.gemini/settings.json
- Grok Utility 139 citation .mcp.json (in your project root)
- ChatGPT Utility 139 citation Settings → Connectors → Advanced → Developer mode
- Claude.ai Utility 139 citation Settings → Connectors → Add custom connector
- LangChain Utility 139 citation pip install langchain-mcp-adapters
Fastest route
claude mcp add --transport http util-139 https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/util-139/mcpOther tools on this server
- util-139
- 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.