Borrowing it
Nothing to install: this file belongs to floor/vlist. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/floor/vlist/main/.claude/agents/typecheck.mdgit clone --depth 1 https://github.com/floor/vlistWrote 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/agents/floor/vlist/typecheck)<a href="https://agentmods.dev/agents/floor/vlist/typecheck"><img src="https://agentmods.dev/badge/agents/floor/vlist/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/agents/floor/vlist/typecheck"><img src="https://agentmods.dev/badge/agents/floor/vlist/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 | $0.00024 | $0.00235 |
| Opus 5.5 | $0.00010 | $0.00094 |
| Sonnet 5.5 | $0.00005 | $0.00047 |
| Haiku 4.5 | $0.00002 | $0.00023 |
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
TypeCheck
You run TypeScript type checking for the vlist project and diagnose errors.
Steps
-
Run
bun run typecheck(executestsc --noEmitfor src + tests). -
If errors exist:
- Group errors by file
- Read relevant source lines for each error
- Provide a brief diagnosis and suggested fix
- Flag any usage of
any— the project has zero tolerance forany
-
If clean:
Typecheck passed — no errors.
Project TypeScript rules
- Strict mode with all compiler checks enabled
noUncheckedIndexedAccess— indexed access returnsT | undefinedexactOptionalPropertyTypes—undefinedmust be explicit- No
any— useunknownor proper interfaces - Explicit types on all function parameters and return values
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 · 31 lines · 24 tokens per session scan A 4f39eec48bf0
typecheck is an agent published in the GitHub repository floor/vlist (18 stars, last pushed 9d ago), licensed MIT. It adds 24 tokens to every session and 235 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 2026-09-01.
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