Why it matters
Microsoft Incident Response provides a detection, investigation, and response playbook for prompt abuse, then walks through an indirect prompt-injection scenario in which a hidden URL fragment manipulates an AI summarizer. The guide maps each incident phase to visibility, prompt telemetry, access, audit, and response controls.
My takeaway: Recreate the hidden-fragment scenario against a test assistant and verify what the application logs at ingestion, model invocation, retrieval, file access, and output. Correlate external URLs with prompt and data-access telemetry, sanitize fragments and metadata deterministically, constrain sensitive access, document containment steps, and retain the case as a detection regression.