> ## Documentation Index
> Fetch the complete documentation index at: https://productbrain.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Troubleshooting

> Common MCP and CLI fixes.

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* **401** — check API key and `Bearer` prefix; URL must include `/mcp`.
* **Missing tools** — restart client; start MCP session for writes.
* **CLI connectivity** — `pb doctor`.

See [MCP authentication](/docs/mcp/authentication).