---
url: >-
  https://adk.nht.io/api/@nhtio/adk/batteries/skills/variables/E_SKILL_TOOL_DUPLICATE.md
description: Raised when one skill declares the same tool name more than once.
---

# Variable: E\_SKILL\_TOOL\_DUPLICATE

```ts
const E_SKILL_TOOL_DUPLICATE: CreatedException<[string]>;
```

Defined in: [src/batteries/skills/exceptions.ts:53](https://github.com/NHTIO/ADK/blob/v1.20260911.0/src/src/batteries/skills/exceptions.ts#L53)

Raised when one skill declares the same tool name more than once.