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 Cratis/AI --skill cratis-arc-command-executiongit clone --depth 1 https://github.com/Cratis/AIWrote 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/cratis/ai/cratis-arc-command-execution)<a href="https://agentmods.dev/skills/cratis/ai/cratis-arc-command-execution"><img src="https://agentmods.dev/badge/skills/cratis/ai/cratis-arc-command-execution.svg" alt="Measured on agentmods" 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 | $0.00082 | $0.01514 |
| Opus 5 | $0.00041 | $0.00757 |
| Sonnet 5 | $0.00016 | $0.00303 |
| Haiku 4.5 | $0.00008 | $0.00151 |
Grade A, and why
cratis-arc-command-execution 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 today.
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.
How it starts
The opening of the file, as written. The whole thing — 147 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Execute an Arc command from code
ICommandPipeline is the same entry point the HTTP boundary uses. Everything
downstream of the entry point is identical: authorization filters, validation
filters, argument resolution including Provide(), Handle(), and response
dispatch.
Verified product sources
| Package | Version | Purpose |
|---|---|---|
Cratis.Arc.Core |
22.10.4 |
Cratis.Arc.Commands.ICommandPipeline, CommandResult, ValidationResultSeverity |
Cratis.Arc.Chronicle |
22.10.4 |
analyzer ARCCHR0006 for reactor replay |
Reverify before claiming support for another version.
When this is the wrong tool
ICommandPipeline is for command-shaped work that needs authorization and
validation. It is not the way to append an event to another stream from inside a
handler — return an EventForEventSourceId from Handle() instead, and never
inject IEventLog (ARCCHR0007).
Inject and execute
public class <Name>Reactor(ICommandPipeline pipeline) : IReactor
{
[OnceOnly]
public Task <Something>Happened(<Something>Happened @event, EventContext context) =>
pipeline.Execute(new <TargetCommand>(@event.<Id>, @event.<Value>));
}
Execute(command) is the scopeless overload: the pipeline creates its own DI
scope for the call. This is the normal case.
The overloads
| Overload | Use it when |
|---|---|
Execute(object command, ValidationResultSeverity? allowedSeverity = default) |
The normal case |
Execute(object command, IServiceProvider serviceProvider, ValidationResultSeverity? allowedSeverity = default) |
The command's dependencies must come from the caller's existing scope |
Execute<TResult>(object command, ...) |
The handler returns a response you need typed |
Validate(object command, ...) |
You need the verdict without any side effect |
Each has both the scopeless and the scoped form. Prefer the scopeless one: the scoped overload exists for a caller that genuinely owns a scope the command's dependencies must share.
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.
- today First seen · 147 lines · 82 tokens per session scan A 65138900ed79
cratis-arc-command-execution is a skill published in the GitHub repository Cratis/AI (2 stars, last pushed today), licensed MIT. It adds 82 tokens to every session and 1,514 once invoked, about $0.0004 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 2026-09-06.
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