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.
cc-delta — Edit Change Size Distribution
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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×
- 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
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 outputyurukusa.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.
Claude Code Ops Kit ($19) — 16 production hooks + 5 templates + 3 tools. Built from 160+ hours of autonomous operation.
Source: yurukusa/cc-delta