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/vudovn/ag-kit/verify-changesnpx skills add vudovn/ag-kit --skill verify-changesgit clone --depth 1 https://github.com/vudovn/ag-kitWhat 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 | $0.00038 | $0.00918 |
| Opus 5 | $0.00019 | $0.00459 |
| Sonnet 5 | $0.00008 | $0.00184 |
| Haiku 4.5 | $0.00004 | $0.00092 |
Grade A, and why
verify-changes scanned grade A with 1 finding 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 2d ago.
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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl http://localhost:3000/api/endpoint How it starts
The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Verify Changes — Prove Code Works
"Code that exists" ≠ "Code that works." This skill ensures changes are verified through execution.
Core Principle
❌ Verification by inspection: "I can see the function exists, it should work"
❌ Verification by assumption: "The types check out, so it's correct"
✅ Verification by execution: "I ran it, here's the output, it works because [evidence]"
Verification Protocol
Step 1: Identify What Changed
- Which files were modified?
- What behavior should be different now?
- What was the original bug/requirement?
Step 2: Determine Verification Method
| Change Type | Verification Method |
|---|---|
| Bug fix | Reproduce the original bug scenario → confirm it no longer occurs |
| New feature | Run the feature → confirm expected output |
| Refactor | Run existing tests → confirm nothing broke |
| API change | Call the endpoint → confirm response shape |
| UI change | Render the component → confirm visual output |
| Config change | Load the config → confirm values applied |
| Build/infra | Run build command → confirm success |
Step 3: Execute Verification
# For Node.js projects
npm run build # Does it compile?
npm run test # Do tests pass?
npm run dev # Does it start?
# For specific files
node -e "require('./path/to/module'); console.log('✅ Loads correctly')"
# For API endpoints
curl http://localhost:3000/api/endpoint
# For scripts
python script.py --test
Step 4: Report Evidence
## Verification Report
### What was changed
- [File list and summary]
### How it was verified
- [Exact commands run]
### Evidence
- Build: ✅ Compiled without errors
- Tests: ✅ 42/42 passing
- Runtime: ✅ Server starts, endpoint returns expected JSON
- Edge case: ✅ Empty input handled correctly
### Not yet verified
- [Anything that couldn't be tested automatically]
Verification Checklist by Project Type
Web Application
-
npm run build— compiles without errors -
npm run lint— no linting errors -
npm run test— all tests pass - Dev server starts successfully
- Changed pages render correctly
- No console errors in browser
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.
- 2d ago First seen · 129 lines · 38 tokens per session scan A a4ab56f9b3e8
verify-changes is a skill published in the GitHub repository vudovn/ag-kit (8,162 stars, last pushed 2d ago), licensed MIT. It adds 38 tokens to every session and 918 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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