cc-delta

Analyze Claude Code edit sizes — are you making surgical fixes or rewriting whole files? Measures old_string and new_string lengths from every Edit tool call.

npx cc-delta

Zero dependencies. Reads ~/.claude/projects/ directly.

Output

cc-delta — Edit Change Size Distribution
================================================
Sessions: 1,835 | Edits: 17,295 | Changed: 2,841K → 3,362K chars (+18.3%)

Edit size distribution (by old_string length):
  micro   (<20)        ████████████             4,120   23.8%
  surgical(20-99)      ████████████████         5,716   33.1%
  moderate(100-499)    █████████                5,189   30.0%
  large  (500-1999)    ████                     1,641    9.5%
  massive(2000+)       ██                         629    3.6%

Expansion ratio (new_len / old_len):
  Median : 1.12×  |  Mean: 1.18×  |  p90: 2.41×
  Shrink : 31.2%  |  Grow: 58.4%  |  Same size: 10.4%

Top file types:
  Ext       Edits   AvgSize  Expansion
  ─────────────────────────────────────────
  .py        5,842     312    1.22×
  .md        3,109     184    1.31×
  .html      2,847     428    1.19×
  .mjs       1,923     281    1.16×
  .json        891      89    1.04×
  .ts          734     203    1.21×
  .sh          312      97    1.11×
  .txt         183      62    1.08×

What it tells you

• 57% of edits are small (micro + surgical) — most Claude Code edits are targeted fixes, not rewrites
• Claude adds more than it removes (median 1.12×) — code grows with each edit session
• Massive edits (2000+ chars) are only 3.6% but represent ~40% of total changed content
• Markdown expands most (1.31×) — docs and READMEs grow the most when edited
• JSON expands least (1.04×) — configuration changes are tight and precise
• p90 ratio is 2.41× — 10% of edits more than double the original content

Dig into a specific file type

npx cc-delta --ext=py      # Python edit breakdown
npx cc-delta --ext=html    # HTML edit patterns
npx cc-delta --ext=json    # Config file edits
npx cc-delta --json        # raw JSON output

Browser version

yurukusa.github.io/cc-delta — drag and drop your projects folder. Includes histograms of edit sizes and expansion ratios.

Part of cc-toolkit — tools for understanding your Claude Code sessions.

Source: yurukusa/cc-delta