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2 people reported

All time, since Sep 30.

Warm prompt cache fully missed

cache_read_input_tokens falls to the 7,085-token system floor or to 0, and cache_creation_input_tokens re-writes the whole conversation.

Is this your bug? What gets counted gets fixed. Pile on.

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I hit this bug: rapsheet.dev/sheets/claude-code/issues/541/file
Follow it to file my report. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Quiet. No reports in the last two weeks, down from 3 a week at the late-September peak. Not fixed, and no vendor reply yet.

Warm 1h prompt cache fully missed mid-session within TTL.

Is this your bug?

File my report
Where
Prompt cache
Versions
2.1.285 to 2.1.288
Platforms
macOS
How bad
Breaks a normal workflow.

Part of: Prompt cache misses and re-writes11 bugs

  1. Interactive sessions get 5m cache TTL18 people
  2. Sleep re-sends full agent context4 people
  3. Resume re-writes prompt cache3 people
  4. CLAUDE.md cache not shared3 people
  5. Cross-session prompt cache misses2 people
  6. Prompt cache misses after system message3 people
  7. Subagent prompt cache expires2 people
  8. Background agent summary requests12 people
  9. Context after prompt breaks cache4 people
  10. Subagent resume cache miss4 people

Original reports3, newest first

  1. Warm 1h prompt cache fully missed (cache_read_input_tokens = 0, 634k tokens re-written) 1.6 min after the previous request, mid tool loop — v2.1.288, Opus 5.5#99096
  2. Prompt cache falls to 7,085-token system floor for 43–58 consecutive calls#98574
  3. Prompt cache drops to 7,085-token system floor across runs of 43–58 calls#98557

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