Infinite tool call

Hey,
It's looping on the same tool over and over again even thought the tool returns a positive result.
I set the maxSteps to 5 so it shouldn't go past 5 calls. But what's even more important is why is it even looping in the first place ?

```ts
export const assistantAgent = new Agent(components.agent, {
name: "Agent",
languageModel: gpt5nano,
textEmbeddingModel: textEmbeddingModel,
instructions: instructions,
tools: { promptBuilder, generateImage },
stopWhen: [hasToolCall("generateImage")],
//[...]
maxSteps: 5,
});
```

Start with the Agent configuration shown in the issue, reproduce the repeated tool call with maxSteps set to 5, and inspect the stopWhen condition around generateImage. Done means the repeated calls stop as intended and the configured maximum of five steps is respected.

Written by the indexing model from the issue text.