browser-url-ok — Port 21 MCP Tool
browser-url-ok
(browser url ok) is one of 31 tools on the
Port 21
MCP server. Connect the server and your client discovers it on the handshake.
by client
How to call browser-url-ok from your client
- Claude Code Port 21 browser-url-ok run in your project directory
- Claude Desktop Port 21 browser-url-ok ~/Library/Application Support/Claude/claude_desktop_config.json
- Cursor Port 21 browser-url-ok ~/.cursor/mcp.json
- VS Code Port 21 browser-url-ok .vscode/mcp.json
- Zed Port 21 browser-url-ok ~/.config/zed/settings.json
- Windsurf Port 21 browser-url-ok ~/.codeium/windsurf/mcp_config.json
- Cline Port 21 browser-url-ok ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
- Gemini CLI Port 21 browser-url-ok ~/.gemini/settings.json
- Grok Port 21 browser-url-ok .mcp.json (in your project root)
- ChatGPT Port 21 browser-url-ok Settings → Connectors → Advanced → Developer mode
- Claude.ai Port 21 browser-url-ok Settings → Connectors → Add custom connector
- LangChain Port 21 browser-url-ok pip install langchain-mcp-adapters
Fastest route
claude mcp add --transport http port-21 https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/port-21/mcpOther tools on this server
- port-21
- utc-time
- timezone
- validate-json
- normalize-url
- inspect-robots
- domain-shape
- citation
- compatibility
- status-catalog
- iana-zones
- web-fetch
- fetch-status
- github-repo-shape
- weather-hint
- memory-key-count
- file-path-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.