[Bug][cyber] False positive while building custom OS images and configuring verified boot (req_011CeDcJRtx64QziTUqB67DE)

**Triage:** kind `cyber` · domain `general` · flagging model `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 session was assembling a custom operating system partition image and configuring verified boot signing keys for hardware provisioning. The automated safeguard flagged standard partition packaging, SELinux policy definition, and cryptographic signing workflows as malicious cyber activity. The workflow involves local image compilation and device provisioning without vulnerability exploitation or network attack mechanisms.

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 2026-08-20T07:31:09.504Z.

### Request IDs (lookup-able server-side)
- `req_011CeDcJRtx64QziTUqB67DE` (2026-08-20T07:31:09.504Z)

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

### Block message
> API Error: Opus 4.8's safeguards flagged this message. Our intentionally broad safeguards allow us to deliver more capabilities faster, but can sometimes flag legitimate cybersecurity work. Apply to the Cyber Verification Program to reduce these interruptions. Send feedback with /feedback or learn more: https://support.claude.com/en/articles/14604842-real-time-cyber-safeguards-on-claude

Details: `[cyber]`

Request ID: req_011CeDcJRtx64QziTUqB67DE

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

### Related reports (same work session, linked)
Distinct false-positive blocks from the same work session, each its own report:
#88666, #88668

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_{🔎 Filed automatically by [ClAudit v2.2.3](https://github.com/sworrl/ClAudit) — a FOSS tool for reporting false-positive Claude Code blocks.}

No repository file, test, or code entry point is identified. Start by reviewing request ID req_011CeDcJRtx64QziTUqB67DE and the related reports #88666 and #88668, then determine how this false positive should be reproduced and handled; done would require an agreed resolution for the verified-boot and OS-image workflow.

Written by the indexing model from the issue text.