Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/arcjet/arcjet-jsnpx agentmods add skills/arcjet/arcjet-js/integrate-arcjet-guard-eveWrote 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/arcjet/arcjet-js/integrate-arcjet-guard-eve)<a href="https://agentmods.dev/skills/arcjet/arcjet-js/integrate-arcjet-guard-eve"><img src="https://agentmods.dev/badge/skills/arcjet/arcjet-js/integrate-arcjet-guard-eve/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/arcjet/arcjet-js/integrate-arcjet-guard-eve"><img src="https://agentmods.dev/badge/skills/arcjet/arcjet-js/integrate-arcjet-guard-eve.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Data Exfiltration · line 193 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00077 | $0.03949 |
| Opus 5.5 | $0.00031 | $0.01580 |
| Sonnet 5.5 | $0.00015 | $0.00790 |
| Haiku 4.5 | $0.00008 | $0.00395 |
Grade A, and why
integrate-arcjet-guard-eve 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 360 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Integrate Arcjet Guard into a Vercel Eve agent
@arcjet/guard's Vercel Eve v0 namespace wraps the agent's existing Arcjet
client. It never talks to the Arcjet API itself. Four surfaces, one decision
rule:
- An authored tool (
agent/tools/*.ts) →guardTool()if you need its execution outcome at the call site, orguardApproval()if you only need to gate it. OnlyguardToolobserves success or failure. - A connection's operations (
agent/connections/*.ts) →guardApproval()on the connection'sapprovalfield. There is no localexecute; nothing else can gate these. - An inbound message (
agent/channels/*.ts) →guardInbound()to screen text before the agent sees it. This is the only place a turn can be declined before it starts. - Everything else →
arcjetHooks()to observe agent lifecycle events. Hooks are observe-only by design and cannot block.
The three in-session helpers correlate by session id, so their decisions land
on one Sequence. guardInbound runs before the session exists and correlates
by whatever identity the channel has, so its decision lands on a second
Sequence. arcjetHooks emits an eve.session-started record carrying both, which
is what lets you pivot from one to the other. This is not hosted Claude
Managed Agents (@arcjet/guard/claude-managed-agents/v0).
Questions to ask the human first
Ask only what you cannot infer from the code; suggest defaults.
- Which tools and connections are risky (external side effects,
irreversible, spends money, sends messages)? Those get gates. Purely
informational tools can be left unguarded or gated with no
rules. - What limits? (e.g. "10 lookups/min per order" →
tokenBucket; "5 integrations/hour" →slidingWindow.) - Who is the user for metadata — an opaque user/tenant/installation ID (never PII)? Default: the Eve principal from the session context.
- Is an Arcjet outage unacceptable? Should the agent be blocked if the guard
is unavailable? Every helper defaults to
onGuardError: "deny", including the channel. Ask explicitly about the channel anyway: failing closed there means the agent stops answering entirely for the duration of the outage, so"allow"is a routine and legitimate choice at that one call site.
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.
- 12d ago Changed · +4 lines 01c10f0021bc
- 20d ago Changed · +2 lines c0112d30c04e
- 21d ago Changed · +5 lines 1b9561318f4d
- 23d ago Changed · +2 lines df094db218c4
- 25d ago Changed 95d9fef1e4b5
- 1mo ago Changed 682301558cf1
- 1mo ago Changed 44c173c38b24
- 1mo ago Changed · +7 lines bc10b3e05e7a
- 1mo ago Changed · +7 lines 075958656fe4
- 1mo ago First seen · 333 lines · 77 tokens per session scan A 644ebfd6f472
integrate-arcjet-guard-eve is a skill published in the GitHub repository arcjet/arcjet-js (694 stars, last pushed 4d ago), licensed Apache-2.0. It adds 77 tokens to every session and 3,949 once invoked, about $0.0003 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 2026-08-30.
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