BerriAI/litellm · error · HTTPException

Blocked by Prompt Security, Violations: {', '.join(violation

Error message

Blocked by Prompt Security, Violations: {', '.join(violations)}

What it means

Error "Blocked by Prompt Security, Violations: {', '.join(violations)}" thrown in BerriAI/litellm.

Source

Thrown at litellm/proxy/guardrails/guardrail_hooks/prompt_security/prompt_security.py:280

        )
        response.raise_for_status()
        res: Final = response.json()

        self._log_api_response(
            url=f"{self.api_base}/api/protect",
            status_code=response.status_code,
            payload={"result": res.get("result")},
        )

        result: Final = res.get("result", {}).get("response", {})
        if result is None:
            return inputs

        action: Final = result.get("action")
        violations: Final = result.get("violations", [])

        if action == "block":
            raise HTTPException(
                status_code=400,
                detail="Blocked by Prompt Security, Violations: " + ", ".join(violations),
            )
        elif action == "modify":
            modified_text: Final = result.get("modified_text")
            if modified_text is not None:
                # If we combined multiple texts, return the modified version as single text
                # The framework will handle distributing it back
                inputs["texts"] = [modified_text]

        return inputs

    def _extract_texts_from_messages(self, messages: list) -> list[str]:
        """Extract text content from messages."""
        texts: Final = []
        for message in messages:
            content = message.get("content")
            if isinstance(content, str):

View on GitHub (pinned to 77b7c6c40c)

Solutions

1. Review the joined violations list and remove the offending content from the prompt.
2. Tune the Prompt Security policy thresholds for false positives.

When it happens

Trigger: Thrown at litellm/proxy/guardrails/guardrail_hooks/prompt_security/prompt_security.py:280 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@77b7c6c40c (2026-08-18). Data as JSON: /api/errors/1bdbdd3680af7398. Report an issue: GitHub.