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Add reserved arg names to tools #1553

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Merged
merged 2 commits into from
Nov 20, 2025
Merged

Add reserved arg names to tools #1553

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5a01f74
Add reserved arg names to tools
lnhsingh Nov 20, 2025
8a9e645
remove js section
lnhsingh Nov 20, 2025
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12 changes: 12 additions & 0 deletions src/oss/langchain/tools.mdx
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Expand Up @@ -138,6 +138,18 @@ Define complex inputs with Pydantic models or JSON schemas:
return result
```
</CodeGroup>

:::python
### Reserved argument names

The following parameter names are reserved and cannot be used as tool arguments. Using these names will cause runtime errors.

| Parameter name | Purpose |
|----------------|---------|
| `config` | Reserved for passing `RunnableConfig` to tools internally |
| `runtime` | Reserved for `ToolRuntime` parameter (accessing state, context, store) |

To access runtime information, use the @[`ToolRuntime`] parameter instead of naming your own arguments `config` or `runtime`.
:::

## Accessing Context
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