# X_MCP_CONFIRMATION_TOOL_UNKNOWN

## Means

mcpConfirmations gates a tool this server does not project

## Typical cause

a name in tools: matches no projected tool, or tools is empty

## Fix

`mcpConfirmations({ tools: ['<a projected tool name>'] })` — x mcp tools --json lists them

[MCP and AI](/error-codes#mcp-and-ai)