Glossary
Controls that constrain what a model or agent can receive or produce at runtime - blocking unsafe inputs and outputs as they happen.
Guardrails are runtime checks applied to prompts and responses: blocking prompt injection, stopping sensitive data from leaving, filtering disallowed content, and validating that output matches an expected shape.
They differ from offline evaluation: guardrails act inline on live traffic, while eval suites measure model quality in testing. Production systems need both.
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