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 agentmods add rules/arcjet/arcjet-plugin/arcjet-pythongit clone --depth 1 https://github.com/arcjet/arcjet-pluginWhat 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 | $0.00000 | $0.00309 |
| Opus 5 | $0.00000 | $0.00154 |
| Sonnet 5 | $0.00000 | $0.00062 |
| Haiku 4.5 | $0.00000 | $0.00031 |
Grade A, and why
arcjet-python 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 yesterday.
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
Arcjet + Python
- Install:
pip install arcjet - Async client (FastAPI):
aj = arcjet(key=..., rules=[...]) - Sync client (Flask):
aj = arcjet_sync(key=..., rules=[...]) - Rule functions use snake_case:
shield(),detect_bot(),token_bucket(),fixed_window(),sliding_window(),detect_sensitive_info(),validate_email(),detect_prompt_injection(). - Use
Mode.LIVE/Mode.DRY_RUNenums, not strings. - Bot categories:
BotCategory.SEARCH_ENGINE, not string literals. - Sensitive info types:
SensitiveInfoType.EMAIL,SensitiveInfoType.CREDIT_CARD_NUMBER, etc. - Decision API:
decision.is_denied(),decision.is_allowed(),decision.is_error(). - Reason types:
decision.reason_v2.typereturns"BOT","RATE_LIMIT","SHIELD", etc. - IP analysis:
decision.ip.is_hosting(),decision.ip.is_vpn(),decision.ip.is_tor(). - Ref: https://docs.arcjet.com/llms.txt
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.
- yesterday First seen · 23 lines · 0 tokens per session scan A 23a3399aeaef
arcjet-python is a cursor rule published in the GitHub repository arcjet/arcjet-plugin (1 stars, last pushed 7d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 309 tokens. 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 2026-08-31.
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