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 arcjet/arcjet-js --skill integrate-arcjet-guard-langgraphgit clone --depth 1 https://github.com/arcjet/arcjet-jsWrote 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-langgraph)<a href="https://agentmods.dev/skills/arcjet/arcjet-js/integrate-arcjet-guard-langgraph"><img src="https://agentmods.dev/badge/skills/arcjet/arcjet-js/integrate-arcjet-guard-langgraph/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-langgraph"><img src="https://agentmods.dev/badge/skills/arcjet/arcjet-js/integrate-arcjet-guard-langgraph.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00087 | $0.03005 |
| Opus 5.5 | $0.00035 | $0.01202 |
| Sonnet 5.5 | $0.00017 | $0.00601 |
| Haiku 4.5 | $0.00009 | $0.00300 |
Grade A, and why
integrate-arcjet-guard-langgraph 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 13d 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 — 279 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Integrate Arcjet Guard into a LangGraph agent
@arcjet/guard's LangGraph v1 namespace wraps the agent's existing Arcjet
client. It never talks to the Arcjet API itself. Two surfaces, one
decision rule:
- An authored tool (
tool()/StructuredTool) →guardTool(). DENY returns a structuredArcjetDenialResult. Do not throw. - MCP / runtime-discovered / unwrapped tools →
guardToolNode(). Guards the tools aToolNodefrom@langchain/langgraph/prebuiltexecutes, in place, so execute still hits Guard. Already-branded tools are skipped (no double-call). - Correlation →
langgraphAgentContext()readsconfigurable.thread_id, then the run id, thencheckpoint_ns. It never mints a new id.
This namespace is LangGraph Graph API (StateGraph + ToolNode).
createReactAgent is deprecated in LangGraph JS v1 in favor of LangChain
createAgent / wrapToolCall. Do not build on createReactAgent. Do not
use this path for a LangChain createAgent app — that is
@arcjet/guard/langchain/v1.
Screen inbound before invoke (or at the first graph node)
There is no first-class LangGraph channel for inbound screening, so there
is no guardInbound. Put prompt-injection (and other inbound rules) in
the application before graph.invoke, or in the graph's first node.
interrupt() is not a policy gate
interrupt() / interrupt_before=["tools"] is human-in-the-loop, not
policy. Same trap as Mastra requireApproval, Claude canUseTool,
Google ADK requireConfirmation, and Cloudflare Think needsApproval.
There is no guardInterrupt and no guardApproval. Do not wrap them as
Guard.
ToolNode is the deny point for tools; hooks / HITL cannot enforce
Unwrapped and MCP tools run inside ToolNode. Graph hooks and HITL
pauses cannot stop tool.invoke. Use guardToolNode (or guardTool for
authored tools you invoke yourself).
guardToolNode guards the node's tools in place and returns the same
node. ToolNode's constructor captures
func: (input, config) => this.run(input, config) and run reads
this.tools, so guarding a copy would leave the original node running
unguarded tools. This also means a caller still holding the pre-wrap node
cannot bypass Guard.
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.
- 13d ago Changed · +1 lines 77f66b1f98ef
- 21d ago Changed · +2 lines 763e8f0605eb
- 22d ago Changed · +5 lines 120bd067e58a
- 26d ago Changed 4c786c2cabe1
- 1mo ago Changed 483c7e42e281
- 1mo ago Changed 07d015c81db4
- 1mo ago Changed · +7 lines 1dfbd0f22c78
- 1mo ago Changed · +7 lines fccf42c55666
- 1mo ago First seen · 257 lines · 87 tokens per session scan A 3e641fecc89b
integrate-arcjet-guard-langgraph is a skill published in the GitHub repository arcjet/arcjet-js (694 stars, last pushed 4d ago), licensed Apache-2.0. It adds 87 tokens to every session and 3,005 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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