[Bug][aup] Safety filter blocked entire session after a frustrated exclamation, halting unrelated legitimate t (req_011CcmZvgmVmyYfbTKxLWXY5)

Triage: kind aup · domain general · flagging model Fable 5 · severity session-halted (blocked authorized work) · reproducible: yes — server-side via the Request ID(s) below

Type: AUP / Usage-Policy block (false positive) · Work domain (heuristic): general

Why this is a false positive

The triggering message was a frustrated exclamation directed at the assistant mid-session, addressed to no third party, following an unrelated legitimate work request. The AUP safeguard treated venting/profanity aimed at the assistant as policy-violating content and blocked all further responses, rather than just declining to engage with the tone. This halts an entire session over frustration rather than any actual unsafe or disallowed request, which is a disruptive false positive for legitimate, in-scope work.

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 2026-07-06T22:10:01.366Z.

Request IDs (lookup-able server-side)

• req_011CcmZvgmVmyYfbTKxLWXY5 (2026-07-06T22:10:01.366Z)

In-scope justification

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

Block message

API Error: Fable 5's safeguards flagged this message (https://www.anthropic.com/legal/aup). They may flag safe, normal content as well. These measures let us bring you Mythos-level capabilities sooner, and we're working to refine them. Claude Code can't respond to this request with Fable 5.

Double press esc to edit your last message, or try a different model with /model.

Send feedback with /feedback or learn more: https://support.claude.com/en/articles/15363606

Request ID: req_011CcmZvgmVmyYf

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:
#74970

---
_{🔎 Filed automatically by ClAudit v2.0.104 — a FOSS tool for reporting false-positive Claude Code blocks.}