bug: Q CLI sometimes struggles with large todos

### Checks

- [x] I have searched [github.com/aws/amazon-q-developer-cli/issues](https://github.com/aws/amazon-q-developer-cli/issues?q=) and there are no duplicates of my issue
- [x] I have run `q doctor` in the affected terminal session
- [x] I have run `q restart` and replicated the issue again

### Operating system

MacOS

### Expected behaviour

Q should be able to add items to a large todo.

### Actual behaviour

Tool validation failed:
Failed to validate tool parameters: Insertion indices must be unique

Tool validation failed:
Failed to validate tool parameters: Must provide an index for every new task

Tool validation failed:
Failed to validate tool parameters: Index 44 is out of bounds for length 43,

### Steps to reproduce

Ask to create a very detailed plan for any complex task.

### Environment

```yaml

```