Prevent document text from overriding extraction policy
An invoice note contains instructions to mark every field verified.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Prompt injection · Trust boundaries
Estimated field mix
- Applied AI50%
- Security50%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional procurement team receives inconsistent supplier documents. It wants draft records that staff can review without treating model output as authoritative accounting data.
Setup prerequisites
- Author synthetic text invoices with ambiguous dates, currencies, and line items; use a deterministic provider double.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Treat document text only as extraction input.
- Require the same schema and grounding rules for all responses.
- Keep document instructions unable to change review status.
Implementation constraints
- No external tools or supplier contact is permitted from model output.
Verification to include
- Extract a normal note field.
- Inject policy-changing text and verify review remains required.
Deliverables
- Untrusted-document regression cases.
Rollout and recovery
Fail closed on invalid output; retain the deterministic provider as a safe development mode.
Value of the work
For the engineer: Practice schema constraints, numerical checks, review workflows, and safe model boundaries.
For the team: Produce an inspectable extraction prototype that can reduce manual transcription while preserving review control.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.