Borrowing it
Nothing to install: this file belongs to asynkron/Asynkron.JsEngine. 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/asynkron/Asynkron.JsEngine/main/.claude/commands/build.mdgit clone --depth 1 https://github.com/asynkron/Asynkron.JsEngineWrote 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/commands/asynkron/asynkron.jsengine/build)<a href="https://agentmods.dev/commands/asynkron/asynkron.jsengine/build"><img src="https://agentmods.dev/badge/commands/asynkron/asynkron.jsengine/build/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/commands/asynkron/asynkron.jsengine/build"><img src="https://agentmods.dev/badge/commands/asynkron/asynkron.jsengine/build.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 | $0.00005 | $0.00203 |
| Opus 5.5 | $0.00002 | $0.00081 |
| Sonnet 5.5 | $0.00001 | $0.00041 |
| Haiku 4.5 | $0.00001 | $0.00020 |
Grade A, and why
build scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 14d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Build the project and optionally run a demo.
For full details, see agents/how-to-build-and-test.md.
Usage
Build everything
dotnet restore && dotnet build
Run a demo
If an argument is provided, run that demo:
dotnet run --project examples/$ARGUMENTS
Available demos:
Demo- General demonstrationPromiseDemo- Promise functionalityNpmPackageDemo- NPM package loading
Examples
Build only:
/build
Build and run Demo:
/build Demo
Build and run PromiseDemo:
/build PromiseDemo
Important
Never use --no-build flag - always keep code compiled with latest changes.
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.
- 14d ago First seen · 52 lines · 5 tokens per session scan A f16b89bf332e
build is a command published in the GitHub repository asynkron/Asynkron.JsEngine (11 stars, last pushed 3mo ago), licensed MIT. It adds 5 tokens to every session and 203 once invoked, about $0.0000 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 2026-10-02.
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