mcp-ai-agent-guidelines/dist/tools/shared/error-handler.js

A comprehensive Model Context Protocol server providing advanced tools, resources, and prompts for implementing AI agent best practices

import { ZodError } from "zod";
import { ErrorCode } from "./error-codes.js";
// biome-ignore lint/correctness/noUnusedImports: validationError import required by specification
import { schemaViolationError } from "./error-factory.js";
import { McpToolError } from "./errors.js";
export function handleToolError(error) {
    // Already an McpToolError - use directly
    if (error instanceof McpToolError) {
        return error.toResponse();
    }
    // ZodError - convert to schema violation
    if (error instanceof ZodError) {
        return schemaViolationError(error.errors).toResponse();
    }
    // Standard Error - detect type from message patterns
    if (error instanceof Error) {
        const mcpError = detectErrorType(error);
        return mcpError.toResponse();
    }
    // Unknown error type
    return new McpToolError(ErrorCode.INTERNAL_ERROR, "An unexpected error occurred", { originalError: String(error) }).toResponse();
}
function detectErrorType(error) {
    const message = error.message.toLowerCase();
    if (message.includes("required") || message.includes("missing")) {
        return new McpToolError(ErrorCode.MISSING_REQUIRED_FIELD, error.message);
    }
    if (message.includes("invalid") || message.includes("validation")) {
        return new McpToolError(ErrorCode.VALIDATION_FAILED, error.message);
    }
    if (message.includes("session") && message.includes("not found")) {
        return new McpToolError(ErrorCode.SESSION_NOT_FOUND, error.message);
    }
    if (message.includes("enoent") || message.includes("file not found")) {
        return new McpToolError(ErrorCode.FILE_NOT_FOUND, error.message);
    }
    return new McpToolError(ErrorCode.INTERNAL_ERROR, error.message, {}, error);
}
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