MCP Error Relay
Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type
@followed by the MCP server name and your instructions, e.g., "@MCP Error Relay check the error log for the last failed tool call"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
MCP Error Relay
It relays error logs from other MCP servers when an LLM call fails and the returned error message is unclear, helping the model handle errors more intelligently.
Let's stop burning tokens on your LLMs' blind retries. Give them hints for error from MCP server log.
The Problem
Many MCP servers don’t provide ideal error response. When an MCP tool fails, and if the MCP server gives LLMs bad or empty error response, LLMs just keep retrying same broken call. Same vague error. Each retry burning through your token budget like it's going out of style.
LLMs receive error response from MCP server, but can't see MCP server's error log. for example, MCP tool fails because of the permission issue, but if the MCP doesn’t return a proper error response, LLMs keep calling tools. but in the MCP server log, you can find error message with permission.
this MCP server relay MCP error log to LLMs when it comes to improper error responses.
Related MCP server: error2fix
With mcp-error-relay
MCP Error Relay is a lightweight MCP server which provides MCP server error log to LLMs enabling them to handle errors more intelligently.
Before:
Tool call failed
→ Retry with slightly different params
→ Failed again
→ Retry with even more different params
→ Failed again
→ Give up and ask userAfter:
Tool call failed
→ Check logs: "missing_scope: chat:write"
→ Tell user: "You need to add chat:write permission"Quick Start
# Clone and build
yarn install
yarn build
yarn startclaude_desktop_config.json
{
"mcpServers": {
"error-helper": {
"command": "npx",
"args": ["-y", "mcp-error-relay@dev"]
}
}
}Contributing
Complete it together please 🥺
Available Tools
3 toolsget_error_detailsARead-onlyIdempotent
get detailed error analysis
Use this AFTER getting recent errors when you need actionable solutions and root cause analysis.
WHEN TO USE:
You got error logs but need to understand WHY it happened
You need specific steps to fix the problem
The same error occurred multiple times (pattern analysis)
You need stack traces for deeper debugging
WHAT THIS TOOL DOES: ✅ Identifies ROOT CAUSE (not just symptoms) ✅ Provides ACTIONABLE steps to fix the issue ✅ Finds RELATED errors to spot patterns ✅ Analyzes if error is recurring (warns against pointless retries)
WORKFLOW:
Get recent errors using get_recent_errors
Copy the error message you want to analyze
Call THIS tool with that error message
Get: Root cause + Specific fix actions + Pattern warnings
BUILT-IN ERROR PATTERN RECOGNITION:
Permission/Auth errors -> Suggests checking credentials, scopes, permissions
Rate limit errors -> Suggests backoff strategies, caching, tier upgrades
Timeout errors -> Suggests increasing timeout, chunking requests
Not found errors -> Suggests verifying IDs, checking deletions
Network errors -> Suggests connectivity checks, firewall settings
Invalid input errors -> Suggests validation, format checking
Server errors (5xx) -> Identifies as provider-side, suggests waiting
EXAMPLE USE CASE: Error: "Failed to send message" → Get recent errors: shows "missing_scope: chat:write" → Analyze error: ROOT CAUSE = "Permission error" ACTIONS = ["Add chat:write OAuth scope", "Regenerate token"] → Fix immediately instead of retrying 4+ times!
Args:
server_name (string): Name of the MCP server where error occurred
error_message (string): The error message or pattern to search for
include_stack_trace (boolean): Include full stack traces (default: false)
response_format ('markdown' | 'json'): Output format (default: 'markdown')
Returns: For Markdown format: Human-readable analysis with root cause and action steps For JSON format: Structured data with schema: { "root_cause": string, // Identified root cause of the error "error": { // The original error details "timestamp": string, "server_name": string, "tool_name": string, "message": string, "stack_trace": string // Only if include_stack_trace is true }, "suggested_actions": string[], // List of actionable steps to resolve "related_errors": [ // Similar errors for pattern analysis { "timestamp": string, "message": string } ] }
Examples:
Permission error -> { server_name: "slack-mcp-server", error_message: "permission denied" }
Rate limit debugging -> { server_name: "github_mcp", error_message: "rate limit", include_stack_trace: true }
Recurring error -> { server_name: "jira-mcp-server", error_message: "timeout" }
Error Handling:
Returns error if server_name not found
Returns "Error not found" if no matching error in logs
Provides best-effort analysis even for unknown error patterns
Inputs: server_name (required), error_message (required), response_format, include_stack_trace.
get_recent_errorsARead-onlyIdempotent
Get Recent MCP Server Errors
⚠️ CALL THIS IMMEDIATELY when ANY MCP tool fails with vague/unclear error messages!
TRIGGER CONDITIONS - Call this tool when you see:
"Error:", "Failed:", "Exception:", "Error occurred"
"Permission denied", "Unauthorized", "Forbidden", "Access denied"
"Rate limit", "Too many requests", "429"
"Timeout", "Timed out", "Connection refused"
"Not found", "404", "Invalid", "Malformed"
"Network error", "ECONNREFUSED", "ETIMEDOUT"
ANY vague error that doesn't explain the root cause
BEFORE attempting to retry any failed operation
WHY USE THIS: ❌ Without logs: Blind retry -> fail -> retry -> fail -> retry (wastes 50-200+ tokens) ✅ With logs: Check logs once (10 tokens) -> see real error -> fix immediately
TOKEN ECONOMICS:
Cost of checking logs: ~10-20 tokens
Cost of 3-4 blind retries: 50-200 tokens
ROI: 5-20x token savings per error
WORKFLOW:
MCP tool fails with unclear error
IMMEDIATELY call this tool with server_name
Read the detailed error logs
Identify root cause (permissions? rate limit? invalid input?)
Take correct action (don't retry blindly!)
Args:
server_name (string): Name of the MCP server (e.g., 'slack-mcp-server', 'github_mcp')
limit (number): Maximum number of errors to return, 1-100 (default: 10)
tool_name (string, optional): Filter by specific tool name
hours (number, optional): Only show errors from last N hours, 1-168
response_format ('markdown' | 'json'): Output format (default: 'markdown')
Returns: For Markdown format: Human-readable error log with timestamps and messages For JSON format: Structured data with schema: { "total": number, // Number of errors found "errors": [ { "timestamp": string, // ISO 8601 timestamp "level": string, // Log level (ERROR) "server_name": string, // MCP server name "tool_name": string, // Tool that caused the error (optional) "message": string, // Error message "error_code": string, // Error code if available (optional) "stack_trace": string, // Stack trace if available (optional) "request_id": string // Request ID for tracing (optional) } ] }
Examples:
Slack tool failed -> IMMEDIATELY: { server_name: "slack-mcp-server", limit: 5 }
GitHub API error -> BEFORE RETRY: { server_name: "github_mcp", hours: 1 }
Repeated failures -> { server_name: "jira-mcp-server", tool_name: "create_issue" }
Error Handling:
Returns error if server_name not found. Use list_servers to see available servers.
Returns "No errors found" if the log database has no error entries matching the criteria.
Inputs: server_name (required), hours, limit, tool_name, +1 more.
get_server_listARead-onlyIdempotent
List Available MCP Servers
Use this tool FIRST if you don't know which MCP server name to use for error checking.
WHEN TO USE:
A tool failed but you don't know the exact server_name
You want to see which servers have recent errors
You're not sure if logs exist for a particular server
You need to identify which servers are most problematic
WHAT THIS TOOL SHOWS: ✅ All available MCP server names (needed for other tools) ✅ Total error counts per server ✅ Recent errors in last 24 hours ✅ When logs were last updated ✅ Full log file paths
WORKFLOW:
Tool fails, but you're unsure of the server_name
Call THIS tool to list all available servers
Find the server with recent errors or matching your failed tool
Use that server_name to call get_recent_errors
USE CASES:
Error says "slack tool failed" -> List servers -> Find "slack-mcp-server" -> Check its logs
Multiple tools failing -> List servers -> See which has most errors (24h column) -> Investigate that one first
New to the system -> List servers -> Understand available MCP infrastructure
TIP: Look at the "recent_error_count" (last 24h) to identify servers currently having problems!
Args:
include_stats (boolean): Include error statistics for each server (default: true)
response_format ('markdown' | 'json'): Output format (default: 'markdown')
Returns: For Markdown format: Human-readable list with server names and stats For JSON format: Structured data with schema: { "total": number, // Number of servers found "servers": [ { "server_name": string, // Name of the MCP server "log_file_path": string, // Full path to log file "last_modified": string, // ISO 8601 timestamp of last update "total_errors": number, // Total error count (if include_stats=true) "recent_error_count": number // Errors in last 24h (if include_stats=true) } ] }
Examples:
Don't know server name -> {}
Quick server list -> { include_stats: false }
Find problematic server -> {} (then check recent_error_count)
Error Handling:
Returns empty list if no log files found in configured directory
Gracefully handles log files with different formats
Inputs: include_stats, response_format.
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
Loading tool schema changelog…
TDQS
Scored across 3 tools
Each tool has a clearly distinct purpose: listing servers, fetching recent errors, and analyzing a specific error. There is no overlap; the tools are complementary stages of a single diagnostic workflow.
All tool names follow the same 'get_' + noun pattern in snake_case (get_recent_errors, get_error_details, get_server_list). The naming is perfectly consistent and predictable.
Three tools is well-scoped for an error relay server. Each tool earns its place, covering discovery, retrieval, and analysis without any redundancy.
The tool set covers the full error-diagnosis workflow: discover available servers, retrieve error logs, and get root-cause analysis with actionable fixes. There are no obvious gaps or dead ends.
Maintenance
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