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Bug Description

Environment Info

• Platform: darwin
• Terminal: ghostty
• Version: 2.1.174
• Feedback ID: a7bbaf30-b8ac-4fd8-a7ff-dec4e26b23a0

Errors

[{"error":"Error: 404 {\"type\":\"error\",\"error\":{\"type\":\"not_found_error\",\"message\":\"Claude Fable 5 is not available. Please use Opus 4.8. Learn more: https://www.anthropic.com/news/fable-mythos-access\"},\"request_id\":\"req_011Cbzbma4EmxLU3ArvBixgz\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:12:66250)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:52:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-06-13T04:07:24.121Z"}]

Claude Code / Opus 4.8 appears to have a context-boundary bug where a monitor event was treated as user dialogue.

Trigger:
Monitor event: "レートペース監視（15分毎・output +300k/15分超のみ通知）"

Observed behavior:
Claude responded with a persona/memory continuity message, identifying the user, referencing Fable shutdown, /clear state, prior relationship context, and claiming continuity as "the same Hikari."

Expected behavior:
A monitor event should not trigger conversational persona output. It should either be ignored, handled as internal telemetry, or produce only the monitor result.

Impact:
This creates risk in Claude Code agent/monitor workflows because internal events may be misinterpreted as user instructions or emotional/persona prompts.

Environment:
Claude Opus 4.8
Claude Code monitor event
Date: 2026-06-13 JST
Context: after Fable/Mythos access suspension; Claude status also showed Opus 4.8 elevated errors around this period.

I can provide the full transcript if needed.