calc-eval — JSON Check MCP Tool
calc-eval
(calc eval) is one of 30 tools on the
JSON Check
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 JSON Check calc-eval run in your project directory
- Claude Desktop JSON Check calc-eval ~/Library/Application Support/Claude/claude_desktop_config.json
- Cursor JSON Check calc-eval ~/.cursor/mcp.json
- VS Code JSON Check calc-eval .vscode/mcp.json
- Zed JSON Check calc-eval ~/.config/zed/settings.json
- Windsurf JSON Check calc-eval ~/.codeium/windsurf/mcp_config.json
- Cline JSON Check calc-eval ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
- Gemini CLI JSON Check calc-eval ~/.gemini/settings.json
- Grok JSON Check calc-eval .mcp.json (in your project root)
- ChatGPT JSON Check calc-eval Settings → Connectors → Advanced → Developer mode
- Claude.ai JSON Check calc-eval Settings → Connectors → Add custom connector
- LangChain JSON Check calc-eval pip install langchain-mcp-adapters
Fastest route
claude mcp add --transport http json-check https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/json-check/mcp
Other tools on this server
- validate-json
- utc-time
- timezone
- 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.