Master MCP Server

# Error Reference ## Configuration validation failed The config did not conform to the schema. The error lists the path and reason. Fix the offending property and reload. ## CircuitOpenError The circuit breaker is open for the selected upstream instance. Reduce upstream failures or increase `recoveryTimeoutMs`. Calls will resume after a successful half-open trial. ## OAuthError An upstream OAuth provider response was invalid. Check client credentials, scopes, and redirect URIs. ## Token decryption failed Persisted token ciphertext could not be decrypted with `TOKEN_ENC_KEY`. Ensure the key has not changed unexpectedly. Clear token storage if necessary and re-authorize.