compatibility — Port 21 MCP Tool
compatibility
(compatibility) 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 compatibility from your client
- Claude Code Port 21 compatibility run in your project directory
- Claude Desktop Port 21 compatibility ~/Library/Application Support/Claude/claude_desktop_config.json
- Cursor Port 21 compatibility ~/.cursor/mcp.json
- VS Code Port 21 compatibility .vscode/mcp.json
- Zed Port 21 compatibility ~/.config/zed/settings.json
- Windsurf Port 21 compatibility ~/.codeium/windsurf/mcp_config.json
- Cline Port 21 compatibility ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
- Gemini CLI Port 21 compatibility ~/.gemini/settings.json
- Grok Port 21 compatibility .mcp.json (in your project root)
- ChatGPT Port 21 compatibility Settings → Connectors → Advanced → Developer mode
- Claude.ai Port 21 compatibility Settings → Connectors → Add custom connector
- LangChain Port 21 compatibility 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
- 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.