claude-code - 💡(How to fix) Fix Claude Code quality degraded significantly in recent 3 days [1 participants]

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anthropics/claude-code#45006Fetched 2026-04-09 08:15:34
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Claude Code quality has dropped noticeably over the past 3 days (around 2026-04-06 to 2026-04-08).

Root Cause

Claude Code quality has dropped noticeably over the past 3 days (around 2026-04-06 to 2026-04-08).

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Description

Claude Code quality has dropped noticeably over the past 3 days (around 2026-04-06 to 2026-04-08).

Symptoms

  • Need to repeat instructions multiple times before Claude follows through completely
  • Fails to proactively clean up stale references when making changes (e.g., had to ask 3 times to remove outdated identifiers from docs after a conceptual change)
  • Responds too quickly without thinking carefully, leading to shallow answers that need correction
  • Overall less thorough and less autonomous compared to previous weeks

Environment

  • Claude Code CLI
  • Model: Claude Opus 4.6 (1M context)

Expected behavior

Claude Code should follow existing project instructions (CLAUDE.md), think before responding, and proactively handle related changes in one pass without requiring repeated prompts.

extent analysis

TL;DR

Review and refine the instructions in CLAUDE.md to ensure clarity and specificity, as unclear instructions might be causing Claude Code to require repeated prompts and fail to follow through completely.

Guidance

  • Verify that the CLAUDE.md file is up-to-date and accurately reflects the current project requirements and expectations.
  • Check for any recent changes in the project that might have introduced ambiguity or inconsistency in the instructions, leading to Claude Code's decreased performance.
  • Consider adding more detailed examples or use cases to the instructions to help Claude Code better understand the context and requirements.
  • Evaluate the possibility of increasing the model's context size or adjusting other configuration parameters to improve its ability to understand and follow complex instructions.

Notes

The issue might be related to the quality of the instructions or the model's ability to understand them, rather than a problem with the Claude Code itself. Refining the instructions and adjusting the model's configuration could help improve its performance.

Recommendation

Apply workaround: Refine and clarify the instructions in CLAUDE.md to improve Claude Code's understanding and performance, as this is a non-invasive and targeted approach to address the observed symptoms.

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FAQ

Expected behavior

Claude Code should follow existing project instructions (CLAUDE.md), think before responding, and proactively handle related changes in one pass without requiring repeated prompts.

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claude-code - 💡(How to fix) Fix Claude Code quality degraded significantly in recent 3 days [1 participants]