[Bug] Anthropic API Error: Safety measures triggered, automatic model downgrade to Opus

Resolved 💬 3 comments Opened Jun 10, 2026 by ie-junky Closed Jun 14, 2026

Bug Description

● Fable 5's safety measures flagged this message for cybersecurity or biology topics. They may flag safe, normal content as well. These measures let us bring you Mythos-level capability in other areas sooner, and we're working to refine them. Switched to
Opus 4.8. Send feedback with /feedback or learn more: https://support.claude.com/en/articles/15363606
⎿ Tip: You can configure model switch behavior in /config

Environment Info

  • Platform: linux
  • Terminal: xterm-256color
  • Version: 2.1.172
  • Feedback ID: a397f317-d706-44c9-a5b4-e952e617cac1

Errors

[{"error":"Error: Tool Glob not found\n    at Ek4 (/$bunfs/root/src/entrypoints/cli.js:4145:15828)\n    at O6 (/$bunfs/root/src/entrypoints/cli.js:594:21164)\n    at V4 (/$bunfs/root/src/entrypoints/cli.js:594:39934)\n    at Mo (/$bunfs/root/src/entrypoints/cli.js:594:50748)\n    at RO (/$bunfs/root/src/entrypoints/cli.js:594:87780)\n    at l4 (/$bunfs/root/src/entrypoints/cli.js:594:86750)\n    at v4 (/$bunfs/root/src/entrypoints/cli.js:594:86572)\n    at Zo (/$bunfs/root/src/entrypoints/cli.js:594:82910)\n    at _$ (/$bunfs/root/src/entrypoints/cli.js:594:6453)\n    at Uk6 (/$bunfs/root/src/entrypoints/cli.js:587:5415)","timestamp":"2026-06-10T20:01:21.228Z"},{"error":"Error: Tool Glob not found\n    at Ek4 (/$bunfs/root/src/entrypoints/cli.js:4145:15828)\n    at O6 (/$bunfs/root/src/entrypoints/cli.js:594:21164)\n    at V4 (/$bunfs/root/src/entrypoints/cli.js:594:39934)\n    at Mo (/$bunfs/root/src/entrypoints/cli.js:594:50748)\n    at RO (/$bunfs/root/src/entrypoints/cli.js:594:87780)\n    at l4 (/$bunfs/root/src/entrypoints/cli.js:594:86750)\n    at v4 (/$bunfs/root/src/entrypoints/cli.js:594:86572)\n    at Zo (/$bunfs/root/src/entrypoints/cli.js:594:82910)\n    at _$ (/$bunfs/root/src/entrypoints/cli.js:594:6453)\n    at Uk6 (/$bunfs/root/src/entrypoints/cli.js:587:5415)","timestamp":"2026-06-10T20:01:28.289Z"},{"error":"Error: Tool Glob not found\n    at Ek4 (/$bunfs/root/src/entrypoints/cli.js:4145:15828)\n    at O6 (/$bunfs/root/src/entrypoints/cli.js:594:21164)\n    at V4 (/$bunfs/root/src/entrypoints/cli.js:594:39934)\n    at Mo (/$bunfs/root/src/entrypoints/cli.js:594:50748)\n    at RO (/$bunfs/root/src/entrypoints/cli.js:594:87780)\n    at l4 (/$bunfs/root/src/entrypoints/cli.js:594:86750)\n    at v4 (/$bunfs/root/src/entrypoints/cli.js:594:86572)\n    at Zo (/$bunfs/root/src/entrypoints/cli.js:594:82910)\n    at _$ (/$bunfs/root/src/entrypoints/cli.js:594:6453)\n    at Uk6 (/$bunfs/root/src/entrypoints/cli.js:587:5415)","timestamp":"2026-06-10T20:01:33.471Z"}]

I am not sure why this flagged, there is nothing biological being discussed.

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