feat(panw_prisma_airs): add custom violation message support

[Harshit28j]

Relevant issues

Adds support for custom violation messages in PANW Prisma AIRS guardrail.

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

CI (LiteLLM team)

CI status guideline:

• 50-55 passing tests: main is stable with minor issues.
• 45-49 passing tests: acceptable but needs attention
• <= 40 passing tests: unstable; be careful with your merges and assess the risk.

• Branch creation CI run
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• CI run for the last commit
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• Merge / cherry-pick CI run
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Type

🆕 New Feature
📖 Documentation

Changes

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Project	Deployment	Review	Updated (UTC)
litellm	Error		Jan 17, 2026 0:31am