@bjoaquinc/mcp-error-formatter
MCP ServerFreeSimple utility to format MCP tool errors like Cursor
Capabilities3 decomposed
mcp tool error formatting with cursor-compatible output
Medium confidenceTransforms raw MCP tool execution errors into structured, human-readable error messages formatted to match Cursor's error presentation style. The formatter intercepts tool error objects, extracts error metadata (message, stack, context), and applies consistent formatting rules that align with how Cursor displays tool failures to users, enabling seamless error handling across MCP-based LLM workflows.
Specifically targets Cursor's error display format rather than generic error formatting, enabling MCP tools built for Cursor to maintain visual and structural consistency with Cursor's native error presentation without custom integration code
Simpler and more focused than generic error formatting libraries because it's purpose-built for MCP + Cursor workflows, avoiding unnecessary abstraction layers while matching Cursor's exact error UX expectations
mcp protocol error response serialization
Medium confidenceSerializes formatted error objects into valid MCP protocol error responses that comply with the MCP specification for tool error handling. The utility handles conversion of JavaScript errors into MCP-compliant JSON structures with proper error codes, messages, and optional context fields, ensuring that error responses can be correctly parsed and handled by MCP clients and LLM agents.
Handles MCP-specific error serialization requirements (protocol version compatibility, error code mapping, context field inclusion) rather than generic JSON serialization, ensuring errors are valid MCP protocol messages
More specialized than generic error serializers because it understands MCP protocol constraints and automatically produces compliant error responses without requiring developers to manually construct MCP error objects
error context preservation and enrichment
Medium confidenceCaptures and preserves error context information (stack traces, execution state, tool parameters, error chain) during error formatting, optionally enriching errors with additional metadata like execution duration, tool name, or parameter values. The formatter maintains error causality chains and includes relevant context that helps LLM agents understand what went wrong and why, without losing information during the formatting transformation.
Preserves full error context and execution state during formatting rather than stripping it down, enabling LLM agents to understand failure causality and make informed retry decisions based on rich error information
More comprehensive than minimal error formatters because it maintains error chains and execution context, giving LLM agents the information needed for intelligent error recovery rather than just human-readable messages
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
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Best For
- ✓MCP server developers building tools for Cursor integration
- ✓Teams building LLM agents that use MCP tools and need consistent error presentation
- ✓Developers migrating tool implementations from Cursor to standalone MCP servers
- ✓MCP server implementers ensuring protocol compliance
- ✓Tool developers building MCP-compatible error handling
- ✓Teams standardizing error response formats across multiple MCP tools
- ✓Production MCP deployments requiring error observability and debugging
- ✓Teams building self-healing LLM agents that need rich error context to retry intelligently
Known Limitations
- ⚠Cursor-specific formatting may not be optimal for non-Cursor MCP clients
- ⚠No built-in error recovery or retry logic — only formats errors for display
- ⚠Limited to error types that fit Cursor's error schema; custom error structures may require pre-processing
- ⚠No internationalization support — error formatting is English-only
- ⚠Only handles MCP protocol v1.x error format — may require updates for future MCP versions
- ⚠Does not validate that error responses match specific tool schemas
Requirements
Input / Output
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Simple utility to format MCP tool errors like Cursor
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