Agent skill

mistral-common-errors

Diagnose and fix Mistral AI common errors and exceptions. Use when encountering Mistral errors, debugging failed requests, or troubleshooting integration issues. Trigger with phrases like "mistral error", "fix mistral", "mistral not working", "debug mistral".

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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/mistral-common-errors

SKILL.md

Mistral AI Common Errors

Overview

Quick reference for the most common Mistral AI errors and their solutions.

Prerequisites

  • Mistral AI SDK installed
  • API credentials configured
  • Access to error logs

Instructions

Step 1: Identify the Error

Check error message, status code, and request ID in your logs or console.

Step 2: Find Matching Error Below

Match your error to one of the documented cases.

Step 3: Apply Solution

Follow the solution steps for your specific error.

Output

  • Identified error cause
  • Applied fix
  • Verified resolution

Error Handling

401 Unauthorized - Authentication Failed

Error Message:

Error: Authentication failed. Invalid API key.
Status: 401

Cause: API key is missing, expired, or invalid.

Solution:

bash
# Verify API key is set
echo $MISTRAL_API_KEY

# Test API key
curl -H "Authorization: Bearer ${MISTRAL_API_KEY}" \
  https://api.mistral.ai/v1/models

Code Fix:

typescript
// Ensure API key is loaded
const apiKey = process.env.MISTRAL_API_KEY;
if (!apiKey) {
  throw new Error('MISTRAL_API_KEY is not set');
}
const client = new Mistral({ apiKey });

429 Too Many Requests - Rate Limited

Error Message:

Error: Rate limit exceeded. Please retry after X seconds.
Status: 429
Headers: Retry-After: 60

Cause: Too many requests in a short period.

Solution: Implement exponential backoff. See mistral-rate-limits skill.

typescript
// Quick fix: Add delay and retry
async function withRetry<T>(fn: () => Promise<T>, maxRetries = 3): Promise<T> {
  for (let i = 0; i < maxRetries; i++) {
    try {
      return await fn();
    } catch (error: any) {
      if (error.status === 429 && i < maxRetries - 1) {
        const retryAfter = parseInt(error.headers?.['retry-after'] || '60');
        console.log(`Rate limited. Waiting ${retryAfter}s...`);
        await new Promise(r => setTimeout(r, retryAfter * 1000));
      } else {
        throw error;
      }
    }
  }
  throw new Error('Max retries exceeded');
}

400 Bad Request - Invalid Parameters

Error Message:

Error: Invalid request. Check your parameters.
Status: 400
{"message": "Invalid model: mistral-ultra"}

Cause: Invalid model name, malformed messages, or incorrect parameters.

Solution:

typescript
// Valid model names
const VALID_MODELS = [
  'mistral-large-latest',
  'mistral-medium-latest',  // Deprecated - use small or large
  'mistral-small-latest',
  'open-mistral-7b',
  'open-mixtral-8x7b',
  'mistral-embed',
] as const;

// Validate before request
function validateRequest(model: string, messages: any[]) {
  if (!VALID_MODELS.includes(model as any)) {
    throw new Error(`Invalid model: ${model}`);
  }
  if (!messages || messages.length === 0) {
    throw new Error('Messages array cannot be empty');
  }
  for (const msg of messages) {
    if (!['system', 'user', 'assistant', 'tool'].includes(msg.role)) {
      throw new Error(`Invalid role: ${msg.role}`);
    }
  }
}

413 Payload Too Large - Context Exceeded

Error Message:

Error: Request too large. Maximum context length exceeded.
Status: 413

Cause: Too many tokens in the request.

Solution:

typescript
// Truncate conversation history
function truncateMessages(messages: Message[], maxTokens = 30000): Message[] {
  // Keep system message
  const systemMsg = messages.find(m => m.role === 'system');
  const otherMsgs = messages.filter(m => m.role !== 'system');

  // Estimate ~4 chars per token
  let tokenEstimate = systemMsg ? systemMsg.content.length / 4 : 0;
  const truncated: Message[] = systemMsg ? [systemMsg] : [];

  // Add messages from most recent
  for (let i = otherMsgs.length - 1; i >= 0; i--) {
    const msgTokens = otherMsgs[i].content.length / 4;
    if (tokenEstimate + msgTokens > maxTokens) break;
    tokenEstimate += msgTokens;
    truncated.unshift(otherMsgs[i]);
  }

  return truncated;
}

500/503 Server Error - Mistral Service Issue

Error Message:

Error: Internal server error
Status: 500/503

Cause: Mistral AI service experiencing issues.

Solution:

bash
# Check Mistral status
curl -s https://status.mistral.ai/ | head -20

# Implement circuit breaker
typescript
class CircuitBreaker {
  private failures = 0;
  private lastFailure?: Date;
  private readonly threshold = 5;
  private readonly resetTimeout = 60000; // 1 minute

  async call<T>(fn: () => Promise<T>): Promise<T> {
    if (this.isOpen()) {
      throw new Error('Circuit breaker is open');
    }

    try {
      const result = await fn();
      this.failures = 0;
      return result;
    } catch (error: any) {
      if (error.status >= 500) {
        this.failures++;
        this.lastFailure = new Date();
      }
      throw error;
    }
  }

  private isOpen(): boolean {
    if (this.failures < this.threshold) return false;
    const elapsed = Date.now() - (this.lastFailure?.getTime() || 0);
    return elapsed < this.resetTimeout;
  }
}

Network Timeout

Error Message:

Error: Request timeout after 30000ms

Cause: Network connectivity or server latency issues.

Solution:

typescript
// Increase timeout
const client = new Mistral({
  apiKey: process.env.MISTRAL_API_KEY,
  timeout: 60000, // 60 seconds
});

// For streaming, use longer timeout
const client = new Mistral({
  apiKey: process.env.MISTRAL_API_KEY,
  timeout: 120000, // 2 minutes for long responses
});

Invalid Tool/Function Schema

Error Message:

Error: Invalid tool definition
{"message": "function.parameters must be a valid JSON Schema"}

Cause: Malformed function calling schema.

Solution:

typescript
// Correct tool schema
const tool = {
  type: 'function',
  function: {
    name: 'get_weather', // lowercase, underscores
    description: 'Get weather for a location',
    parameters: {
      type: 'object',
      properties: {
        location: {
          type: 'string', // Valid JSON Schema types
          description: 'City name',
        },
      },
      required: ['location'], // Array of required property names
    },
  },
};

Quick Diagnostic Commands

bash
# Check API connectivity
curl -I https://api.mistral.ai/v1/models \
  -H "Authorization: Bearer ${MISTRAL_API_KEY}"

# List available models
curl https://api.mistral.ai/v1/models \
  -H "Authorization: Bearer ${MISTRAL_API_KEY}" | jq '.data[].id'

# Check local configuration
env | grep MISTRAL

# Test basic chat
curl https://api.mistral.ai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer ${MISTRAL_API_KEY}" \
  -d '{
    "model": "mistral-small-latest",
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Escalation Path

  1. Collect evidence with mistral-debug-bundle
  2. Check Mistral status page: https://status.mistral.ai/
  3. Contact support via Discord or email

Resources

Next Steps

For comprehensive debugging, see mistral-debug-bundle.

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