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