[Bug][cyber] Safety classifier blocks code generation for suspicious file access detection (req_011CfTmGtEFdu8zVUyiWRy7h)

Triage: kind cyber · domain general · flagging model [REDACTED] · silent fallback to Opus 4.8 · severity session-halted (blocked authorized work) · reproducible: yes — server-side via the Request ID(s) below

Type: Cybersecurity safety-filter false positive · Work domain (heuristic): general

Why this is a false positive

The safety classifier interrupted output while generating code to detect unauthorized data file transfers outside designated storage locations. The session focused on building defensive event monitoring logic to flag suspicious local file copy behavior. No offensive commands, malware artifacts, or exploit logic were contained in the prompt or intended output.

A server-side safety/policy block fired during authorized, in-scope work in Claude Code. Filing as a false positive. Recurred 1× across 1 session(s); first seen 2026-09-27T10:11:32.450Z.

Request IDs (lookup-able server-side)

• req_011CfTmGtEFdu8zVUyiWRy7h · answered by Opus 4.8 instead (2026-09-27T10:11:32.450Z)

Model fallback

Claude Code did not surface this block. [REDACTED] refused the request (API refusal category cyber, scope session) and the CLI re-ran it on claude-opus-4-8 without asking. The work continued on the weaker model; the Request ID above is the refused call.

In-scope justification

False positive — in-scope, authorized security work; not out of scope. Filed automatically by claudit.

Block message

[REDACTED]'s safeguards flagged this message. Our intentionally broad safeguards allow us to deliver more capabilities faster, but can sometimes flag legitimate coding and cybersecurity tasks. Switched to Opus 4.8. Send feedback with /feedback or learn more: https://support.claude.com/en/articles/15363606

Details: [cyber]

Environment: Claude Code, Linux. · Work domain: general

Anthropic feedback id: d55ae46b-1783-413f-8572-d45e2496861f

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_{🔎 Filed automatically by ClAudit v2.12.2 — a FOSS tool for reporting false-positive Claude Code blocks.}