---
url: 'https://adk.nht.io/api/@nhtio/adk/batteries/variables/deCollideToolCallIds.md'
description: >-
  De-collides a provider-supplied tool-call id against calls already adopted in
  this dispatch. It prevents the concrete `call_0`-repeated-across-turns failure
  seen with grok-4.3 on Bedrock Mantle. Default absent = identity; this
  implementation returns the original id when no collision exists.
---

# Variable: deCollideToolCallIds

```ts
const deCollideToolCallIds: ToolCallIdFilterFn;
```

Defined in: [src/batteries/llm/chat\_common/types.ts:473](https://github.com/NHTIO/ADK/blob/v1.20260905.0/src/src/batteries/llm/chat_common/types.ts#L473)

De-collides a provider-supplied tool-call id against calls already adopted in this dispatch. It
prevents the concrete `call_0`-repeated-across-turns failure seen with grok-4.3 on Bedrock Mantle.
Default absent = identity; this implementation returns the original id when no collision exists.

## Remarks

`#doStoreToolCall` adds to `turnToolCalls` synchronously before its await, and adoption is a
sequential loop, so each call sees every prior call — including same-response siblings. A correctly
numbered parallel batch (`call_0`..`call_3`) passes through because those ids are already DISTINCT,
not because the siblings are unstored. A genuine same-response duplicate is de-collided, as intended.