Function isUnknownToolCause

packages/plugins/mcp/src/sdk/invoke.ts:190–201

(cause: unknown, toolName: string)

};

const isUnknownToolCause = (cause: unknown, toolName: string): boolean => {
  const sdk = mcpClientSdkIfLoaded();
  const protocolError = asProtocolError(cause);
  return (
    sdk !== undefined &&
    protocolError !== undefined &&
    (protocolError.code === sdk.client.ProtocolErrorCode.InvalidParams ||
      protocolError.code === sdk.client.ProtocolErrorCode.MethodNotFound) &&
    // oxlint-disable-next-line executor/no-unknown-error-message -- boundary: the narrowing above reaches the SDK's ProtocolError, whose message carries the only unknown-tool discriminator the protocol provides
    isUnknownToolMessage(protocolError.message, toolName)
  );
};

// ---------------------------------------------------------------------------
// Elicitation bridge — decode incoming MCP ElicitRequest, route through