claude-code - 💡(How to fix) Fix [FEATURE] Configurable context lines for Edit tool diffs [1 comments, 2 participants]

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anthropics/claude-code#46999Fetched 2026-04-13 05:44:10
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Code Example

{
  "editDiffContextLines": 5
}
RAW_BUFFERClick to expand / collapse

Problem

When the Edit tool modifies a file, the diff shown to the user has a fixed number of context lines. When edits are in code with repetitive structure (e.g., multiple similar blocks), the limited context can make it hard to tell which block was modified, leading to misreading the diff.

Proposal

Add a setting (e.g., in settings.json) to control the number of context lines shown around Edit tool diffs:

{
  "editDiffContextLines": 5
}

Default could remain as-is; users who find themselves misreading diffs due to elided lines could increase it.

Why

In a code review session, the user misread diffs twice due to insufficient context, mistakenly thinking code was missing when it was just outside the visible window. More context lines would have prevented both misreadings.

🤖 Filed with assistance from Claude Code.

extent analysis

TL;DR

Add a configurable setting to control the number of context lines shown around Edit tool diffs to improve readability.

Guidance

  • Introduce a new setting, e.g., editDiffContextLines, in the settings.json file to allow users to customize the context lines.
  • Set a reasonable default value for the setting, e.g., 5, to balance between providing enough context and avoiding clutter.
  • Consider adding a hint or documentation to inform users about the new setting and its purpose.
  • Test the new setting with various diff scenarios to ensure it effectively addresses the issue.

Example

{
  "editDiffContextLines": 5
}

This example shows how the new setting can be configured in the settings.json file.

Notes

The proposed solution assumes that the Edit tool's diff display is flexible enough to accommodate a variable number of context lines. If the tool's architecture imposes limitations, additional modifications might be necessary.

Recommendation

Apply workaround: Introduce the configurable setting to allow users to adjust the context lines according to their needs, as this provides a flexible solution to address the issue without requiring significant changes to the Edit tool's core functionality.

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