> ## Documentation Index
> Fetch the complete documentation index at: https://docs.narrative.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Duplicate Caller-Declared Tool Name

> Two entries in tools[] share the same name.

**HTTP status:** 400

## Error message

```
duplicate caller-declared tool names (must be unique within tools[]): {names}
```

## When this error occurs

Caller-declared tools (top-level `tools[]`) are looked up by exact name match when a model
emits a dash-free tool call. Two entries with the same `name` would make resolution
ambiguous (which `input_schema` does the model see? which `tools[]` entry does the call
resolve to?), so the API rejects the config up front.

## How to fix

Give each caller-declared tool a unique `name`. If two tools really need similar names,
differentiate them with a suffix (`confirm_booking_user`, `confirm_booking_admin`).