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claude-code - 💡(How to fix) Fix [BUG] Context summary from earlier in session injected mid-conversation, causing data inconsistencies [1 comments, 2 participants]

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anthropics/claude-code#52370•Fetched 2026-04-24 06:08:58
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

During a long active session, a summary of earlier conversation parts was automatically injected mid-session when context limit was approached. This summary contained inaccurate data (e.g. wrong plant count: "~40" instead of actual 56/57). The injected summary then influenced subsequent responses with incorrect information, without user awareness. Expected: User is notified when context is being compressed/summarized. Actual: Silent injection of inaccurate summary mid-session. OS: Windows 11

What Should Happen?

User should be notified when context is being compressed or summarized, so they are aware that subsequent responses may be based on an inaccurate or incomplete summary rather than the full conversation.

Error Messages/Logs

Steps to Reproduce

  1. Start a long Claude Code session with many file edits (multiple large files, repeated tool calls)
  2. Continue session until context limit is approached (noticeable when responses slow down or tool calls hang)
  3. Continue conversation after that point
  4. Observe that a summary of earlier conversation parts has been silently injected into the context
  5. Ask Claude about a specific fact from earlier in the session — response may contain inaccurate data from the injected summary

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

No response

Claude Code Version

4.6

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

No response

extent analysis

TL;DR

Notify the user when context is being compressed or summarized to prevent silent injection of inaccurate information.

Guidance

  • Review the context limit approach and summary injection mechanism to identify why inaccurate data is being injected.
  • Consider adding a notification system to alert users when context is being compressed or summarized.
  • Investigate the Sonnet model's behavior and potential limitations that may contribute to the inaccurate summary injection.
  • Test the issue with different models or versions to determine if it's specific to the Sonnet model or a more general problem.

Example

No code snippet is provided as the issue does not contain sufficient technical details to create a relevant example.

Notes

The issue may be related to the context limit approach or the summary injection mechanism, but more information is needed to determine the root cause.

Recommendation

Apply a workaround by modifying the context limit approach or summary injection mechanism to notify users when context is being compressed or summarized, as the issue is not specific to a particular version and a fix is not available.

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claude-code - 💡(How to fix) Fix [BUG] Context summary from earlier in session injected mid-conversation, causing data inconsistencies [1 comments, 2 participants]