# Gancho de tratamento de erros

O onErrorOccurred gancho é chamado quando ocorrem erros durante a execução da sessão. Use-o para:

<!-- markdownlint-disable GHD046 GHD005 -->

<!-- Suppressed: GHD046 (outdated release terminology), GHD005 (hardcoded data variable) -->

* Implementar o log de erros personalizado
* Rastrear padrões de erro
* Fornecer mensagens de erro amigáveis ao usuário
* Desencadear alertas para erros críticos

## Assinatura de Hook

<div class="ghd-codetabs">
<div class="ghd-codetab" data-lang="typescript" data-label="TypeScript"><div class="ghd-codetab-fallback-label" role="heading" aria-level="3">TypeScript</div>

```typescript
type ErrorOccurredHandler = (
  input: ErrorOccurredHookInput,
  invocation: HookInvocation
) => Promise<ErrorOccurredHookOutput | null | undefined>;
```

</div>

<div class="ghd-codetab" data-lang="python" data-label="Python"><div class="ghd-codetab-fallback-label" role="heading" aria-level="3">Python</div>

```python
ErrorOccurredHandler = Callable[
    [ErrorOccurredHookInput, dict[str, str]],
    Awaitable[ErrorOccurredHookOutput | None]
]
```

</div>

<div class="ghd-codetab" data-lang="go" data-label="Go"><div class="ghd-codetab-fallback-label" role="heading" aria-level="3">Go</div>

```golang
type ErrorOccurredHandler func(
    input ErrorOccurredHookInput,
    invocation HookInvocation,
) (*ErrorOccurredHookOutput, error)
```

</div>

<div class="ghd-codetab" data-lang="dotnet" data-label=".NET"><div class="ghd-codetab-fallback-label" role="heading" aria-level="3">.NET</div>

```csharp
public delegate Task<ErrorOccurredHookOutput?> ErrorOccurredHandler(
    ErrorOccurredHookInput input,
    HookInvocation invocation);
```

</div>

<div class="ghd-codetab" data-lang="java" data-label="Java"><div class="ghd-codetab-fallback-label" role="heading" aria-level="3">Java</div>

<!-- docs-validate: skip -->

```java
// Note: Java SDK does not have an onErrorOccurred hook.
// Use EventErrorPolicy and EventErrorHandler instead:
//
// session.setEventErrorPolicy(EventErrorPolicy.SUPPRESS_AND_LOG_ERRORS);
// session.setEventErrorHandler((event, ex) -> {
//     System.err.println("Error in " + event.getType() + ": " + ex.getMessage());
// });
//
// See the "Basic Error Logging" example below for a complete snippet.
```

</div>

</div>

## Entrada

| Campo          | Tipo    | Description                                                                          |
| -------------- | ------- | ------------------------------------------------------------------------------------ |
| `timestamp`    | número  | Carimbo de data/hora Unix de quando o erro ocorreu                                   |
| `cwd`          | cadeia  | Diretório de trabalho atual                                                          |
| `error`        | cadeia  | Mensagem de erro                                                                     |
| `errorContext` | cadeia  | Onde o erro ocorreu: `"model_call"`, , `"tool_execution"`ou `"system"``"user_input"` |
| `recoverable`  | boolean | Se o erro pode ser potencialmente recuperável                                        |

## Saída

Retorne `null` ou `undefined` para usar o tratamento de erros padrão. Caso contrário, retorne um objeto com:

| Campo              | Tipo    | Description                                                            |
| ------------------ | ------- | ---------------------------------------------------------------------- |
| `suppressOutput`   | boolean | Se for true, não mostre a saída de erro para o usuário                 |
| `errorHandling`    | cadeia  | Como lidar com: `"retry"`, `"skip"`ou `"abort"`                        |
| `retryCount`       | número  | Número de vezes para tentar novamente (se errorHandling for `"retry"`) |
| `userNotification` | cadeia  | Mensagem personalizada para mostrar o usuário                          |

## Exemplos

### Log de erros básico

<div class="ghd-codetabs">
<div class="ghd-codetab" data-lang="typescript" data-label="TypeScript"><div class="ghd-codetab-fallback-label" role="heading" aria-level="3">TypeScript</div>

```typescript
const session = await client.createSession({
  hooks: {
    onErrorOccurred: async (input, invocation) => {
      console.error(`[${invocation.sessionId}] Error: ${input.error}`);
      console.error(`  Context: ${input.errorContext}`);
      console.error(`  Recoverable: ${input.recoverable}`);
      return null;
    },
  },
});
```

</div>

<div class="ghd-codetab" data-lang="python" data-label="Python"><div class="ghd-codetab-fallback-label" role="heading" aria-level="3">Python</div>

```python
from copilot.session import PermissionHandler

async def on_error_occurred(input_data, invocation):
    print(f"[{invocation['session_id']}] Error: {input_data['error']}")
    print(f"  Context: {input_data['errorContext']}")
    print(f"  Recoverable: {input_data['recoverable']}")
    return None

session = await client.create_session(on_permission_request=PermissionHandler.approve_all, hooks={"on_error_occurred": on_error_occurred})
```

</div>

<div class="ghd-codetab" data-lang="go" data-label="Go"><div class="ghd-codetab-fallback-label" role="heading" aria-level="3">Go</div>

```golang
session, _ := client.CreateSession(context.Background(), &copilot.SessionConfig{
    Hooks: &copilot.SessionHooks{
        OnErrorOccurred: func(input copilot.ErrorOccurredHookInput, inv copilot.HookInvocation) (*copilot.ErrorOccurredHookOutput, error) {
            fmt.Printf("[%s] Error: %s\n", inv.SessionID, input.Error)
            fmt.Printf("  Context: %s\n", input.ErrorContext)
            fmt.Printf("  Recoverable: %v\n", input.Recoverable)
            return nil, nil
        },
    },
})
```

</div>

<div class="ghd-codetab" data-lang="dotnet" data-label=".NET"><div class="ghd-codetab-fallback-label" role="heading" aria-level="3">.NET</div>

```csharp
var session = await client.CreateSessionAsync(new SessionConfig
{
    Hooks = new SessionHooks
    {
        OnErrorOccurred = (input, invocation) =>
        {
            Console.Error.WriteLine($"[{invocation.SessionId}] Error: {input.Error}");
            Console.Error.WriteLine($"  Context: {input.ErrorContext}");
            Console.Error.WriteLine($"  Recoverable: {input.Recoverable}");
            return Task.FromResult<ErrorOccurredHookOutput?>(null);
        },
    },
});
```

</div>

<div class="ghd-codetab" data-lang="java" data-label="Java"><div class="ghd-codetab-fallback-label" role="heading" aria-level="3">Java</div>

<!-- docs-validate: skip -->

```java
import com.github.copilot.*;
import com.github.copilot.rpc.*;

// Note: Java SDK does not have an onErrorOccurred hook.
// Use EventErrorPolicy and EventErrorHandler instead:

var session = client.createSession(
    new SessionConfig()
        .setOnPermissionRequest(PermissionHandler.APPROVE_ALL)
).get();

session.setEventErrorPolicy(EventErrorPolicy.SUPPRESS_AND_LOG_ERRORS);
session.setEventErrorHandler((event, ex) -> {
    System.err.println("[" + session.getSessionId() + "] Error: " + ex.getMessage());
    System.err.println("  Event: " + event.getType());
});
```

</div>

</div>

### Enviar erros para o serviço de monitoramento

```typescript
import { captureException } from "@sentry/node"; // or your monitoring service

const session = await client.createSession({
  hooks: {
    onErrorOccurred: async (input, invocation) => {
      captureException(new Error(input.error), {
        tags: {
          sessionId: invocation.sessionId,
          errorContext: input.errorContext,
        },
        extra: {
          error: input.error,
          recoverable: input.recoverable,
          cwd: input.cwd,
        },
      });
      
      return null;
    },
  },
});
```

### Mensagens de erro amigáveis

```typescript
const ERROR_MESSAGES: Record<string, string> = {
  "model_call": "There was an issue communicating with the AI model. Please try again.",
  "tool_execution": "A tool failed to execute. Please check your inputs and try again.",
  "system": "A system error occurred. Please try again later.",
  "user_input": "There was an issue with your input. Please check and try again.",
};

const session = await client.createSession({
  hooks: {
    onErrorOccurred: async (input) => {
      const friendlyMessage = ERROR_MESSAGES[input.errorContext];
      
      if (friendlyMessage) {
        return {
          userNotification: friendlyMessage,
        };
      }
      
      return null;
    },
  },
});
```

### Suprimir erros não críticos

```typescript
const session = await client.createSession({
  hooks: {
    onErrorOccurred: async (input) => {
      // Suppress tool execution errors that are recoverable
      if (input.errorContext === "tool_execution" && input.recoverable) {
        console.log(`Suppressed recoverable error: ${input.error}`);
        return { suppressOutput: true };
      }
      return null;
    },
  },
});
```

### Adicionar contexto de recuperação

```typescript
const session = await client.createSession({
  hooks: {
    onErrorOccurred: async (input) => {
      if (input.errorContext === "tool_execution") {
        return {
          userNotification: `
The tool failed. Here are some recovery suggestions:
- Check if required dependencies are installed
- Verify file paths are correct
- Try a simpler approach
          `.trim(),
        };
      }
      
      if (input.errorContext === "model_call" && input.error.includes("rate")) {
        return {
          errorHandling: "retry",
          retryCount: 3,
          userNotification: "Rate limit hit. Retrying...",
        };
      }
      
      return null;
    },
  },
});
```

### Rastrear padrões de erro

```typescript
interface ErrorStats {
  count: number;
  lastOccurred: number;
  contexts: string[];
}

const errorStats = new Map<string, ErrorStats>();

const session = await client.createSession({
  hooks: {
    onErrorOccurred: async (input, invocation) => {
      const key = `${input.errorContext}:${input.error.substring(0, 50)}`;
      
      const existing = errorStats.get(key) || {
        count: 0,
        lastOccurred: 0,
        contexts: [],
      };
      
      existing.count++;
      existing.lastOccurred = input.timestamp;
      existing.contexts.push(invocation.sessionId);
      
      errorStats.set(key, existing);
      
      // Alert if error is recurring
      if (existing.count >= 5) {
        console.warn(`Recurring error detected: ${key} (${existing.count} times)`);
      }
      
      return null;
    },
  },
});
```

### Alerta sobre erros críticos

```typescript
const CRITICAL_CONTEXTS = ["system", "model_call"];

const session = await client.createSession({
  hooks: {
    onErrorOccurred: async (input, invocation) => {
      if (CRITICAL_CONTEXTS.includes(input.errorContext) && !input.recoverable) {
        await sendAlert({
          level: "critical",
          message: `Critical error in session ${invocation.sessionId}`,
          error: input.error,
          context: input.errorContext,
          timestamp: new Date(input.timestamp).toISOString(),
        });
      }
      
      return null;
    },
  },
});
```

### Combinar com outros ganchos para contexto

```typescript
const sessionContext = new Map<string, { lastTool?: string; lastPrompt?: string }>();

const session = await client.createSession({
  hooks: {
    onPreToolUse: async (input, invocation) => {
      const ctx = sessionContext.get(invocation.sessionId) || {};
      ctx.lastTool = input.toolName;
      sessionContext.set(invocation.sessionId, ctx);
      return { permissionDecision: "allow" };
    },
    
    onUserPromptSubmitted: async (input, invocation) => {
      const ctx = sessionContext.get(invocation.sessionId) || {};
      ctx.lastPrompt = input.prompt.substring(0, 100);
      sessionContext.set(invocation.sessionId, ctx);
      return null;
    },
    
    onErrorOccurred: async (input, invocation) => {
      const ctx = sessionContext.get(invocation.sessionId);
      
      console.error(`Error in session ${invocation.sessionId}:`);
      console.error(`  Error: ${input.error}`);
      console.error(`  Context: ${input.errorContext}`);
      if (ctx?.lastTool) {
        console.error(`  Last tool: ${ctx.lastTool}`);
      }
      if (ctx?.lastPrompt) {
        console.error(`  Last prompt: ${ctx.lastPrompt}...`);
      }
      
      return null;
    },
  },
});
```

## Práticas recomendadas

1. **Sempre registre os erros** - Mesmo que você os oculte dos usuários, mantenha os logs para depuração.

2. **Categorizar erros** – Use `errorType` para lidar com erros diferentes adequadamente.

3. **Não engole erros críticos** – suprime apenas os erros que você tem certeza de que não são críticos.

4. **Mantenha os ganchos rápidos** – o tratamento de erros não deve atrasar a recuperação.

5. **Fornecer contexto útil** – quando ocorrem erros, `additionalContext` pode ajudar o modelo a se recuperar.

6. **Monitorar padrões de erro** – acompanhe erros recorrentes para identificar problemas sistêmicos.

## Consulte também

* [Usar ganchos](/pt/copilot/how-tos/copilot-sdk/hooks)
* [Ganchos de ciclo de vida de sessão](/pt/copilot/how-tos/copilot-sdk/hooks/session-lifecycle)
* [Guia de depuração](/pt/copilot/how-tos/copilot-sdk/troubleshooting/debugging)