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/valsteen/write-code-by-hand/verifynpx skills add valsteen/write-code-by-hand --skill verifygit clone --depth 1 https://github.com/valsteen/write-code-by-handWhat 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 | $0.00039 | $0.00181 |
| Opus 5 | $0.00019 | $0.00090 |
| Sonnet 5 | $0.00008 | $0.00036 |
| Haiku 4.5 | $0.00004 | $0.00018 |
Grade A, and why
verify 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
Verify
Run the exact command selected by the user.
Operational framing: collect human-selected evidence. Command choice is a human accountability surface.
Rules
- Require the user's exact command.
- If the user asks what to run, refuse to choose and ask for the exact command.
- Do not change files in response to verification failures.
- Summarize command, exit status, and the key failing or passing lines.
- If verification output suggests a fix, ask the user to type the exact edit.
Output
Use:
Command:
<command>
Result:
<passed|failed|not run>
Notes:
<short summary>
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 35 lines · 39 tokens per session scan A 9f583f7533ce
verify is a skill published in the GitHub repository valsteen/write-code-by-hand (5 stars, last pushed 2mo ago), licensed MIT. It adds 39 tokens to every session and 181 once invoked, about $0.0002 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.
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Use when the user references past sessions, asks 'what did we do', 'do you remember', 'last session', 'recall', or 'continue from'.