# X_MCP_CONFIRMATION_EVIDENCE_INVALID

## Means

an MCP confirmation approval carries no valid signed evidence

## Typical cause

mcpConfirmations({ evidence }) is declared and an approval's signature is missing, does not verify against the approver's registered keys, signs another confirmation's payload, or the stored approvals no longer meet the quorum

## Fix

`confirmations({ id, decision: 'view' }) — sign the signingPayload it returns with a key registered to you, then approve with that signature and exactly the arguments it returns`

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