fix: issues introduced by intrinsic changes

[jakelorocco]

Misc PR

Type of PR

• Bug Fix
• New Feature
• Documentation
• Other

Description

• Link to Issue: Fixes Failing nightlies in 2026-04-30-0f95f84 #985

Testing

• Tests added to the respective file if code was changed
• New code has 100% coverage if code as added
• Ensure existing tests and github automation passes (a maintainer will kick off the github automation when the rest of the PR is populated)

Attribution

• AI coding assistants used

[github-actions]

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[ajbozarth]

This LGTM, but Claude had a couple nits:

pyproject.toml — xgrammar pin
The hard == pin works for urgency but creates maintenance debt. Two asks:

• Expand the comment to reference the upstream issue/symptoms so future maintainers know when it's safe to unpin
• Is there a follow-up issue open to revisit once upstream fixes it?

Test split
One gap: nothing directly exercises the tools=None formatter path from util.py. The fix looks obviously right, but a small unit test there would prevent a regression.