Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/dyoshikawa/rulesync/diff-analyzenpx skills add dyoshikawa/rulesync --skill diff-analyzegit clone --depth 1 https://github.com/dyoshikawa/rulesyncWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00021 | $0.00221 |
| Opus 5 | $0.00010 | $0.00111 |
| Sonnet 5 | $0.00004 | $0.00044 |
| Haiku 4.5 | $0.00002 | $0.00022 |
Grade A, and why
diff-analyze scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Diff Analyze
Analyze the differences between the current branch and origin/main, and summarize the current work progress.
Step 1: Refresh Main Branch
Fetch the latest main branch state:
git fetch origin main
Step 2: Inspect the Diff
Get the differences between the current branch and main:
git diff origin/main...HEAD
Step 3: Inspect Commit History
Get the commit history of the current branch since it diverged from main:
git log origin/main..HEAD --oneline
Step 4: Summarize the Work
Based on the diff and commit history, summarize:
- The main purpose of the current changes
- The notable files or areas affected
- The current implementation progress
- Any obvious risks, gaps, or follow-up work
Keep the summary concise and practical.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 48 lines · 21 tokens per session scan A 50fdb5b31fd7
diff-analyze is a skill published in the GitHub repository dyoshikawa/rulesync (1,362 stars, last pushed yesterday), licensed MIT. It adds 21 tokens to every session and 221 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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