Arcjet

Arcjet is an AI agent runtime security platform that enforces policies across actions, prompts, and tool calls.

Arcjet provides runtime security for AI agents and web applications by observing actions, enforcing policies, and auditing decisions. It captures every action an agent takes, grouping them into runs to check for prompt injection, sensitive info, bot signals, and action policies. The platform returns typed decisions such as allow, block, redact, or hold for review before execution occurs. It is designed for engineers and security teams building AI agents, coding agents, queue consumers, and workflow steps. Arcjet integrates natively via SDKs and frameworks, supporting tools like Claude Code, Codex, Copilot, and Cursor.

Arcjet at a glance

Best for: Software engineer
Runs on: Web, API, CLI
Pricing: Individual at $25/mo; Startup at $299/mo; Enterprise with custom pricing; usage fees apply; 15-day free trial.
Released: January 2023
Category: AI coding tool
Website: arcjet.com

Key features

Detect prompt injection in inputs and outputs
Authorize agent tool calls by identity and role
Redact PII and sensitive data
Cap token and spend budgets per user and run
Detect bots and abuse with real time threat feeds
Version controlled and testable rules in code

Use it for

Prevent AI agents from taking unauthorized actions
Stop PII leaks in prompts and third party calls
Control runaway token loops and spend budgets
Shield web applications with bot detection and WAF

Alternatives to Arcjet

ToolJet — Builds complete apps and workflows using natural language or coding agents.
ARTEX — Runs autonomous multi-agent penetration testing with a dual-graph architecture.
Aegis Kernel — Stops prompt injection and tool-hijacking at the OS syscall boundary.
PentAGI — It autonomously manages penetration testing workflows within a secure Docker sandbox.
Melra — Governs AI agent tool calls with local policies, approval gates, and verified receipts.
AgentDock — It coordinates multi-device workflows and provides secure environment access.
OpenAPPA — Tracks data flows algebraically to prevent prompt injection without breaking agents.
Uber ADR — It secures enterprise AI agents through threat detection and benchmarking.
AgentOps — Track token usage, costs, and traces across 400 plus LLMs and agent frameworks.
AgentMail — Enables AI agents to send and receive emails programmatically via REST API.
Augment — Org-wide agent loops on top of a deep codebase context engine
Ona — Securely govern and execute autonomous software engineering agent fleets at scale.

All Arcjet alternatives