Context Guard: Secure Model Output and Enforce Topic Scope

Context Guard secures the application surface — the product around the model, where orchestration, business logic, and output handling live. It treats every model response as untrusted input to the rest of your stack, so nothing renders, executes, or leaves the boundary until it has been inspected.

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What Context Guard protects

The application layer: the responses the model produces and the scope it is allowed to operate within. Improperly handled output is one of the most common ways an LLM turns a harmless prompt into a downstream exploit — unescaped markup that runs in a browser, generated code that executes on a server, or a confidently wrong answer outside the assistant’s remit.

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Threats it stops

• Improper output handling — output schemas validated (BG-17), executable HTML and scriptable payloads neutralized (BG-06, BG-22), and generated code screened (BG-19) before anything renders or executes.
• Scope violation — out-of-scope topics refused or redirected against admin-defined boundaries (BG-26).
• Misinformation & IP — ungrounded or out-of-scope claims rewritten to a compliant equivalent or declined; brand and IP checks score whatever remains (BG-16).

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How it works

Context Guard applies the same policy engine to outputs that Prompt Guard applies to inputs. Responses are context-aware encoded (HTML, attribute, URL, JS), structured outputs are validated against their schema, and out-of-scope content is resolved to allow, deny, mask, or rewrite — preserving user intent where a compliant rewrite is possible rather than simply blocking.

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Controls

Context Guard runs BG-06, BG-16, BG-17, BG-19, BG-22, and BG-26. See the Controls Catalog for each control’s definition, scope, and benchmark.

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OWASP coverage

Addresses LLM05 Improper Output Handling and LLM09 Misinformation from the OWASP LLM Top 10.

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