# 用户提示转换钩子

userPromptTransformed 钩子会在运行时将生成的上下文添加到已提交的提示后运行，但会在生成的内容保存到会话历史记录中或发送给模型之前运行。

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!-- Suppressed: GHD046 (outdated release terminology), GHD005 (hardcoded data variable) --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

当你需要检查或替换确切的面向模型的提示时使用它。 `prompt` 输入包含任何 `userPromptSubmitted` 钩子运行后的用户提示，而 `transformedPrompt` 也包含运行时生成的上下文，例如 `<current_datetime>`。

## 输入和输出

| 输入字段 | 类型 | Description |
| --- | --- | --- |
| `sessionId` | 字符串 | 运行时会话标识符 |
| `timestamp` | 日期/时间 | 钩子被调用的时间 |
| `cwd` / `workingDirectory` | 字符串 | 当前工作目录 |
| `prompt` | 字符串 | `userPromptSubmitted` 钩子后的提示 |
| `transformedPrompt` | 字符串 | 运行时转换后面向模型的提示 |

如果不返回任何值，则转换后的提示将保持不变。 返回 `modifiedTransformedPrompt` 以替换存储在会话历史记录中并发送到模型的内容。

## Examples

<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>

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

```typescript
const session = await client.createSession({
  hooks: {
    onUserPromptTransformed: async (input) => ({
      modifiedTransformedPrompt: redact(input.transformedPrompt),
    }),
  },
});
```

</div>

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

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

```python
session = await client.create_session(
    hooks={
        "on_user_prompt_transformed": lambda input_data, invocation: {
            "modifiedTransformedPrompt": redact(input_data["transformedPrompt"])
        }
    }
)
```

</div>

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

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

```golang
session, err := client.CreateSession(ctx, &copilot.SessionConfig{
    Hooks: &copilot.SessionHooks{
        OnUserPromptTransformed: func(input copilot.UserPromptTransformedHookInput, invocation copilot.HookInvocation) (*copilot.UserPromptTransformedHookOutput, error) {
            return &copilot.UserPromptTransformedHookOutput{
                ModifiedTransformedPrompt: copilot.String(redact(input.TransformedPrompt)),
            }, 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>

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

```csharp
var session = await client.CreateSessionAsync(new SessionConfig
{
    Hooks = new SessionHooks
    {
        OnUserPromptTransformed = (input, invocation) =>
            Task.FromResult<UserPromptTransformedHookOutput?>(new()
            {
                ModifiedTransformedPrompt = Redact(input.TransformedPrompt),
            }),
    },
});
```

</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
var hooks = new SessionHooks().setOnUserPromptTransformed((input, invocation) ->
    CompletableFuture.completedFuture(
        new UserPromptTransformedHookOutput(redact(input.transformedPrompt()))));

var session = client.createSession(new SessionConfig().setHooks(hooks)).get();
```

</div>

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

```rust
#[async_trait]
impl SessionHooks for MyHooks {
    async fn on_user_prompt_transformed(
        &self,
        input: UserPromptTransformedInput,
        _ctx: HookContext,
    ) -> Option<UserPromptTransformedOutput> {
        Some(UserPromptTransformedOutput {
            modified_transformed_prompt: Some(redact(&input.transformed_prompt)),
        })
    }
}

let session = client
    .create_session(SessionConfig::default().with_hooks(Arc::new(MyHooks)))
    .await?;
```

</div>

</div>

替换将保留为用户消息内容，因此恢复的会话将重播已修改的内容不变。