feat: add efficiency warning for single SEARCH/REPLACE blocks in apply_diff

[KJ7LNW]

Context

The apply_diff tool was missing efficiency guidance similar to what the read_file tool provides. When models use only one SEARCH/REPLACE block, they miss opportunities to batch multiple related changes in a single operation, leading to inefficient API usage patterns.

Implementation

Added single block detection by counting <<<<<<< SEARCH occurrences in the diff content. When only one block is detected, the tool now includes a warning message encouraging models to batch multiple related changes for better efficiency.

The warning message is prepended to successful results: "Making multiple related changes in a single apply_diff is more efficient for the LLM. If other changes are needed in this file, please include them as additional SEARCH/REPLACE blocks."

This follows the same pattern established by the read_file tool, which warns models when only one file is read to encourage reading multiple files simultaneously for better LLM context efficiency.

How to Test

1. Use apply_diff with only one SEARCH/REPLACE block
2. Verify that the warning message appears in the tool result
3. Use apply_diff with multiple SEARCH/REPLACE blocks
4. Verify that no warning appears for multi-block usage

Discord: KJ7LNW

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Important

Adds a warning in applyDiffToolLegacy for single SEARCH/REPLACE blocks to encourage batching changes for efficiency.

• Behavior:
  • Adds a warning in applyDiffToolLegacy in applyDiffTool.ts for single SEARCH/REPLACE blocks.
  • Encourages batching multiple related changes for efficiency.
  • Warning message: "Making multiple related changes in a single apply_diff is more efficient for the LLM. If other changes are needed in this file, please include them as additional SEARCH/REPLACE blocks."
• Implementation:
  • Counts SEARCH block occurrences in diffContent to detect single block usage.
  • Prepends warning to results if only one block is detected.

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