bug: Multiple tool calls in one completion response are not handled

[vacekj]

• I have looked for existing issues (including closed) about this

Bug Report

Instead of handling all of the tool calls, the current agent impl only handles the first one.

Reproduction

Call a model that returns multiple tool calls, for example the calculator agent with multiple subs and adds

Expected behavior

Rig correctly evaluates all of the tool calls.

Actual behaviour

Rig only evaluates the first tool call.

Fix PR incoming!

[0xMochan]

Check out #168 as a potential fix that was deployed specifically for Anthropic!