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 skills add zjshen14/opencli --skill typecheckgit clone --depth 1 https://github.com/zjshen14/opencliWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/zjshen14/opencli/typecheck)<a href="https://agentmods.dev/skills/zjshen14/opencli/typecheck"><img src="https://agentmods.dev/badge/skills/zjshen14/opencli/typecheck/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/zjshen14/opencli/typecheck"><img src="https://agentmods.dev/badge/skills/zjshen14/opencli/typecheck.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00025 | $0.00271 |
| Opus 5.5 | $0.00010 | $0.00108 |
| Sonnet 5.5 | $0.00005 | $0.00054 |
| Haiku 4.5 | $0.00003 | $0.00027 |
Grade A, and why
typecheck 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 1mo 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.
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
Run type checking for this project.
Typecheck script detection: !{cat package.json 2>/dev/null | python3 -c "import sys,json; s=json.load(sys.stdin).get('scripts',{}); print('\n'.join(f'{k}: {v}' for k,v in s.items() if any(x in k for x in ['type','tsc','check'])))" 2>/dev/null || echo "(no package.json typecheck script found)"}
Task: $ARGUMENTS
Steps:
- Detect the type checker:
- TypeScript: run the
typechecknpm script, ornpx tsc --noEmitif no script exists - Python:
mypy .orpyright - Other: check Makefile or CI config
- TypeScript: run the
- Run and capture full output
- Group errors by file; for each: show file path, line number, error code, and message
- Report count: N errors, M warnings
- Prioritise errors over warnings
Do not auto-fix type errors — report them and wait for instruction.
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.
- 1mo ago First seen · 27 lines · 25 tokens per session scan A c7d398cc1046
typecheck is a skill published in the GitHub repository zjshen14/opencli (2 stars, last pushed 1mo ago), licensed MIT. It adds 25 tokens to every session and 271 once invoked, about $0.0001 per session on Opus 5.5. 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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