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".
npxskills add jeremylongshore/claude-code-plugins-plus-skills--skill mistral-common-errorsLoading…
Quick reference for diagnosing and fixing Mistral AI API errors. Covers HTTP status codes, SDK-specific issues, streaming failures, and tool calling problems with real solutions.
MISTRAL_API_KEY configuredset -euo pipefail
# Test API connectivity and auth
curl -s -w "\nHTTP Status: %{http_code}\n" \
-H "Authorization: Bearer ${MISTRAL_API_KEY}" \
https://api.mistral.ai/v1/models | jq '.data[].id' 2>/dev/null || echo "FAILED"
# Check env
echo "Key set: ${MISTRAL_API_KEY:+yes}"
echo "Key length: ${#MISTRAL_API_KEY}"
Error: Authentication failed. Invalid API key.
Causes: Key missing, expired, revoked, or wrong workspace.
Fix:
const apiKey = process.env.MISTRAL_API_KEY;
if (!apiKey) throw new Error('MISTRAL_API_KEY is not set');
// Test the key
const client = new Mistral({ apiKey });
try {
await client.models.list();
} catch (e: any) {
if (e.status === 401) {
console.error('API key invalid — regenerate at console.mistral.ai');
}
}
Verify manually:
set -euo pipefail
curl -H "Authorization: Bearer ${MISTRAL_API_KEY}" https://api.mistral.ai/v1/models
Error: Rate limit exceeded. Retry-After: 60
Causes: Exceeded RPM (requests/min) or TPM (tokens/min) for your tier.
Fix:
async function withBackoff<T>(fn: () => Promise<T>, maxRetries = 5): Promise<T> {
for (let i = 0; i <= maxRetries; i++) {
try {
return await fn();
} catch (error: any) {
if (error.status !== 429 || i === maxRetries) throw error;
const wait = Math.min(2 ** i * 1000, 60_000);
console.warn(`Rate limited, retrying in ${wait}ms...`);
await new Promise(r => setTimeout(r, wait));
}
}
throw new Error('Max retries exceeded');
}
Check your limits: Visit console.mistral.ai/limits for workspace RPM/TPM caps.
{"message": "Unknown model: mistral-ultra"}
Fix: Use valid model IDs:
const VALID_MODELS = [
'mistral-large-latest',
'mistral-small-latest',
'codestral-latest',
'pixtral-large-latest',
'mistral-embed',
'mistral-moderation-latest',
] as const;
List available models dynamically:
set -euo pipefail
curl -H "Authorization: Bearer ${MISTRAL_API_KEY}" \
https://api.mistral.ai/v1/models | jq -r '.data[].id' | sort
{"message": "messages must be a non-empty array"}
Fix: Validate message structure before sending:
function validateMessages(messages: any[]): void {
if (!messages?.length) throw new Error('Messages array empty');
const validRoles = ['system', 'user', 'assistant', 'tool'];
for (const msg of messages) {
if (!validRoles.includes(msg.role)) {
throw new Error(`Invalid role: "${msg.role}"`);
}
if (!msg.content && !msg.toolCalls) {
throw new Error(`Message with role "${msg.role}" has no content`);
}
}
}
{"message": "tool_call_id is required for tool messages"}
Fix: Every tool result must include the matching toolCallId:
// After receiving tool_calls from the model
for (const call of response.choices[0].message.toolCalls) {
const result = await executeFunction(call.function.name, call.function.arguments);
messages.push({
role: 'tool',
name: call.function.name,
content: JSON.stringify(result),
toolCallId: call.id, // REQUIRED — must match call.id
});
}
Error: Maximum context length exceeded
Fix: Trim conversation history, keeping system message:
function trimToFit(messages: any[], maxChars = 100_000): any[] {
const system = messages.find(m => m.role === 'system');
const rest = messages.filter(m => m.role !== 'system');
const kept: any[] = system ? [system] : [];
let chars = system?.content?.length ?? 0;
// Keep most recent messages that fit
for (let i = rest.length - 1; i >= 0; i--) {
const msgChars = JSON.stringify(rest[i]).length;
if (chars + msgChars > maxChars) break;
chars += msgChars;
kept.splice(system ? 1 : 0, 0, rest[i]);
}
return kept;
}
Error: Internal server error
Causes: Mistral service issue (temporary).
Fix:
class CircuitBreaker {
private failures = 0;
private lastFailure = 0;
private readonly threshold = 5;
private readonly resetMs = 60_000;
async call<T>(fn: () => Promise<T>): Promise<T> {
if (this.failures >= this.threshold) {
if (Date.now() - this.lastFailure < this.resetMs) {
throw new Error('Circuit breaker open — Mistral service unavailable');
}
this.failures = 0; // Reset after timeout
}
try {
const result = await fn();
this.failures = 0;
return result;
} catch (error: any) {
if (error.status >= 500) {
this.failures++;
this.lastFailure = Date.now();
}
throw error;
}
}
}
Error [ERR_REQUIRE_ESM]: require() of ES Module not supported
Cause: @mistralai/mistralai is ESM-only since v1.x.
Fix: Either use import syntax (recommended) or dynamic import:
// Option 1: Convert to ESM
// package.json: "type": "module"
import { Mistral } from '@mistralai/mistralai';
// Option 2: Dynamic import in CJS
const { Mistral } = await import('@mistralai/mistralai');
Error: Request timeout after 30000ms
Fix:
const client = new Mistral({
apiKey: process.env.MISTRAL_API_KEY,
timeoutMs: 60_000, // Increase for long completions
});
// For streaming, the timeout applies to initial connection
// Individual chunks have no timeout
mistral-debug-bundle| Error | Cause | Solution |
|---|---|---|
401 | Auth failure | Regenerate key at console.mistral.ai |
429 | Rate limit | Backoff + check tier limits |
400 | Bad params | Validate model, messages, tools |
413 | Context overflow | Trim conversation history |
5xx | Service error | Retry with circuit breaker |
ERR_REQUIRE_ESM | CJS import | Use ESM import syntax |
For comprehensive debugging, see mistral-debug-bundle.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).