Q-Layer against injection attacks: bounding response conditions
This page clarifies the Q-Layer’s role as a bounding layer: defining when a response is authorized, under what conditions, and with what level of evidence, facing injection attacks (direct and indirect).
Injection attacks exploit a structural weakness: a system treats heterogeneous fragments as if they belonged to the same authority hierarchy. The result is not merely an incorrect response, but a response produced under an illegitimate authority rank.
In this ecosystem, the Q-Layer is not a “content filter”. It is a governance layer that aims to stabilize response conditions: what can be asserted, what must be bounded, what must be refused, and what must remain suspended.
Operational definition
Q-Layer: bounding layer that imposes response conditions (evidence, sources, perimeter, exclusions, confidence level) and prevents an unauthorized instruction or datum from producing an output considered legitimate.
Facing injection, the objective is simple: prevent the displacement of decisional authority toward a non-canonical, unauthorized, or non-contextualized fragment.
Why injection is a response conditions problem
An injection succeeds when the system responds when it should not, or responds “too strongly” (assertion, certainty, prescription) when conditions are not met.
The Q-Layer treats injection as a question of legitimacy:
- What has the right to instruct?
- What has the right to carry authority?
- Which sources are admissible for this response?
- Which exclusions apply?
- When is the correct outcome abstention?
Bounding: instruction, context, authority separation
Effective protection imposes strict separation between:
- Instruction: what commands (policies, runtime rules, system instructions).
- Context: what informs (retrieval, documents, extracts, memory).
- Authority: what can be cited or treated as canonical truth (definitions, doctrine, stabilized surfaces).
Without this separation, injected content can climb the hierarchy and become an implicit rule, even if presented as “text”.
Response conditions: minimal grid
- Admissibility: the request is within the authorized perimeter (and outside exclusions).
- Source hierarchy: priority sources are identified and used.
- Inference prohibition: zones forbidden for inference are respected.
- Confidence level: the response does not exceed the evidence available.
- Abstention: when conditions are not met, the correct output is silence or escalation.
