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 commands/jhlee0409/claude-plugins/diffgit clone --depth 1 https://github.com/jhlee0409/claude-pluginsWhat 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 | $0.00007 | $0.02376 |
| Opus 5 | $0.00003 | $0.01188 |
| Sonnet 5 | $0.00001 | $0.00475 |
| Haiku 4.5 | $0.00001 | $0.00238 |
Grade A, and why
diff 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.
How it starts
The opening of the file, as written. The whole thing — 371 lines — stays where its author put it; the contents beside it link to each section on GitHub.
API Diff
Compare OpenAPI spec changes to see what's new, changed, or removed.
MCP Dependency Check
Before executing this command, invoke skill: mcp-dependency
- Verify OpenAPI Sync MCP server is installed
- If not available, offer to install via
npm install -g @jhlee0409/openapi-sync-mcp - Only proceed after MCP is confirmed available
Usage
# Current spec vs latest remote spec (smart caching)
/oas:diff --remote
# Compare two files
/oas:diff ./old-openapi.json ./new-openapi.json
# Current spec vs specific file
/oas:diff ./previous-version.json
# Compare with cached previous version
/oas:diff
# Force fetch remote (bypass cache)
/oas:diff --remote --force
# Use cached spec only (offline)
/oas:diff --offline
Smart Caching
Use skill: cache-manager
When using --remote:
1. Check if spec changed (HEAD request)
- ETag/Last-Modified comparison
2. If unchanged → Use cached spec for "new" side
3. If changed → Fetch new spec, update cache
Benefits:
- Fast when spec hasn't changed
- Saves bandwidth
- Always accurate when changes detected
Output with cache hit:
/oas:diff --remote
✅ Using cached spec (ETag unchanged)
Comparing cached version vs codebase...
Output with cache miss:
/oas:diff --remote
🔄 Spec changed, fetching updates...
Comparing new spec vs codebase...
Diff Process
┌─────────────────┐ ┌─────────────────┐
│ OLD SPEC │ │ NEW SPEC │
│ (cache/file) │ │ (remote/file) │
└────────┬────────┘ └────────┬────────┘
│ │
└──────────┬───────────┘
│
▼
┌─────────────────────┐
│ Compare Endpoints │
│ path + method │
└──────────┬──────────┘
│
┌───────────────┼───────────────┐
▼ ▼ ▼
┌───────┐ ┌──────────┐ ┌─────────┐
│ ADDED │ │ CHANGED │ │ REMOVED │
│ (+) │ │ (~) │ │ (-) │
└───┬───┘ └────┬─────┘ └────┬────┘
│ │ │
└──────────────┼───────────────┘
▼
┌─────────────────────┐
│ Output Report │
└─────────────────────┘
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 · 371 lines · 7 tokens per session scan A 82233c5a14be
diff is a command published in the GitHub repository jhlee0409/claude-plugins (4 stars, last pushed 7mo ago), licensed MIT. It adds 7 tokens to every session and 2,376 once invoked, about $0.0000 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 2026-08-31.
Other commands, from other repositories
brand-setup
Configure a new brand profile with colors, fonts, logo, visual style, platforms, and compliance rules.
save
Save this conversation as a new or existing reusable context.
screens
Structures product UX screen design — inventory, flow, states, and reusable briefs for external design tools — without generating pixels or UI code.
graphify
Turn your vault into a clustered knowledge graph with HTML and JSON outputs.
index
Command "index" from MadaraUchiha-314/the-loop, covering commands, the control plane, daemon commands, repo-scoped commands and maintenance.
review
Cold re-quiz on code that already shipped — your own session commits, not the change in front of you.