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Claude Code Issues / #25597

[Bug] Anthropic API Error 400: Invalid Ephemeral Cache Control Inputs

Status Fixed / completed
Reported on v2.1.39
Maintainer reply None cached
Activity 2 comments · opened Feb 13, 2026 · closed Feb 13, 2026

Bug Description
I started a new session and immediately got an API error 400 about ephemeral cache control inputss.

Environment Info

  • Platform: darwin
  • Terminal: ghostty
  • Version: 2.1.39
  • Feedback ID: e2399213-621b-4ead-890c-087edd676232

Errors
API Error: 400 

{"type":"error","error":{"type":"invalid_request_error","message":"system.2.cache_control.ephemeral.scope: Extra inputs
      are not permitted"},"request_id":"req_011CY6YBiFCrpz9yX5XXDJkC"}

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