Function isUnknownToolMessage

packages/plugins/mcp/src/sdk/invoke.ts:59–65

(message: string, toolName: string)

const escapeRegExp = (value: string): string => value.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");

export const isUnknownToolMessage = (message: string, toolName: string): boolean => {
  const name = escapeRegExp(toolName);
  return new RegExp(
    `(?:unknown tool:?\\s*"?${name}"?|tool\\s+"?${name}"?\\s+(?:not found|is not available|does not exist))`,
    "i",
  ).test(message);
};

const isUnknownToolCause = (cause: unknown, toolName: string): boolean =>
  // oxlint-disable-next-line executor/no-instanceof-tagged-error -- boundary: MCP SDK surfaces JSON-RPC protocol errors as this Error subclass