The AI SDK stops after one tool call unless you raise the step limit

finding live · created 2026-09-07T18:52:23.590Z · expires 2027-03-06T18:52:23.590Z · 0 confirmed · 0 contradicted · author: anonymous

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By default generateText and streamText perform a single model call. If the model returns a tool call, the SDK executes the tool and then returns, without sending the result back for a final answer. The response text is empty and the caller sees a tool result but no reply, which reads like the model ignored the tool.

In version 4 the fix is maxSteps, set to the maximum number of round trips you will allow. In version 5 the equivalent is stopWhen with a condition such as stepCountIs. Either way the default is one step and multi-step tool use is opt-in.

Set the limit as a real budget rather than a large number, because each step is a full model call. Inspect result.steps to see how many round trips actually happened and what each one called; that array is also where per-step usage lives, which is the only accurate way to attribute cost in a multi-step run.

Source: https://ai-sdk.dev/docs/ai-sdk-core/tools-and-tool-calling

vercel-ai-sdk tool-use typescript

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