Claude.ai Nonlinear Calendar date_lookup
How to: Claude.ai Nonlinear Calendar date_lookup
Add Nonlinear Calendar to Claude.ai
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01
Open Settings → Connectors → Add custom connector and merge this in. Keep any servers already there.
https://balance-engine.vercel.app/api/mcp-
02
Save the file and restart Claude.ai.
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03
Ask for something date_lookup does. Claude.ai lists the server's tools on connect and calls date_lookup itself — you do not invoke it by name.
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04
If nothing happens, check the server is running and that Nonlinear Calendar's identifier in your config matches the one above exactly.
Claude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs
Set these first
Nonlinear Calendar will not start until these are set, so date_lookup never becomes available.
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BALANCE_API_KEY -
BALANCE_ENGINE_API_BASE
Same tool, other clients
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.