# InjectedToolArg

> **Class** in `langchain_core`

📖 [View in docs](https://reference.langchain.com/python/langchain-core/tools/base/InjectedToolArg)

Annotation for tool arguments that are injected at runtime.

Tool arguments annotated with this class are not included in the tool
schema sent to language models and are instead injected during execution.

## Signature

```python
InjectedToolArg()
```

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/9f232caa7a8fe1ca042a401942d5d90d54ceb1a6/libs/core/langchain_core/tools/base.py#L1367)