Crucible

Crucible is a self-hosted Linux security tool that stress-tests AI agents before production. It sends attack payloads covering prompt injection, jailbreaks, goal hijacking, unsafe output, and tool misuse, evaluating tool calls, side effects, and outcomes rather than generated text alone. The site lists 11 modules and 153 attack vectors, covering eight of ten OWASP Agentic risks, with two in development. A scan runs 90 payloads in under 60 seconds and returns an A–F report with severity, OWASP mapping, and reproduction steps. Crucible works with LangChain, CrewAI, AutoGen, raw MCP endpoints, and agents exposing HTTP or MCP interfaces. GitHub Actions can fail a build when a score falls below a configured threshold. The pip CLI supports Python 3.10+. Local scanning needs no signup and has no telemetry by default.

Crucible combines broad agent attack coverage with fast scans and detailed reports. Its free Community plan and local operation fit builders who want security checks without signup or default telemetry.

It suits individual builders, open-source projects, and teams shipping AI agents. Organizations needing self-hosted testing and CI checks can use its supported integrations.

Crucible is a self-hosted security scanner that attacks AI agents before they reach production. It suits individual builders, open-source maintainers, and teams that need repeatable checks in local development or CI. Its strongest case is broad, action-focused testing without signup; organizations needing hosted monitoring or enterprise governance will need a paid tier.

Overview

Crucible targets prompt injection, goal hijacking, tool misuse, jailbreaks, unsafe outputs, and other agent failures. Rather than judging only generated text, it evaluates real tool calls, side effects, and outcomes. That makes it relevant to agents whose risk lies in what they do, not merely what they say.

The project lists 11 modules containing 153 attack vectors. Eight of the ten OWASP Agentic risks are covered, while two are still in active development. Crucible says it can send 90 attack payloads in under 60 seconds, a useful cadence for pull-request checks and iterative fixes, but the incomplete OWASP coverage means it should complement—not replace—broader security review.

Key features

• Actionable reports: Every scan produces an A–F grade with severity, OWASP mapping, and reproduction steps. The reproduction detail gives developers a path to reproduce and correct a failure instead of relying on a score alone.
• Agent-aware testing: Observing calls, side effects, and outcomes can expose unsafe behavior that text-only scanners miss. Prompt-injection, jailbreak, unsafe-output, and custom test cases are supported.
• Broad integrations: LangChain, CrewAI, AutoGen, raw MCP endpoints, and agents available through HTTP or MCP can be scanned. This is a practical range for teams with different agent stacks.
• CI/CD enforcement: GitHub Actions can fail a build when an agent's security score falls below a configured threshold, turning scan results into a release gate rather than a report developers can ignore.
• Local-first operation: Install the CLI with pip on Python 3.10 or newer. No Docker, cloud signup, or API key is required to start, and local scanning has no signup and no telemetry by default.

Pricing

Community — free. Intended for individual builders and open-source projects, this includes the full CLI, all eight current test modules, 153 vectors across 11 modules, local and CI JSON/HTML reports, and Community Discord support. The absence of feature gating on security tests makes this the sensible starting point for personal projects and public codebases. It does not include the operational monitoring and collaboration features in higher tiers.

Team — custom pricing, billed Early Access. Teams shipping agents to production get everything in Community plus drift monitoring, Slack alerts, regression tracking, hosted dashboards, and priority support. Those additions address ongoing production oversight, but the price is not published, so budget approval requires a direct quote.

Enterprise — custom pricing, billed Custom. Organizations with compliance or scale requirements add SSO, audit logs, on-premises or VPC deployment, custom attack modules, SLAs, and dedicated security engineering support on top of Team. It is the appropriate tier for controlled environments, although both cost and contractual terms are quote-based.

Platforms

Crucible runs on Linux as self-hosted software. The pip-based CLI and HTTP/MCP connectivity favor teams that control their runtime and want scan data to remain in their environment; there is no hosted web application included in the Community positioning.

Who it's for

Choose Crucible if you build or maintain an AI agent and want fast, repeatable adversarial checks in development or CI, especially when privacy or local execution matters. Community is aimed at solo builders and open-source projects; Team is for production teams that need drift and regression visibility; Enterprise is for organizations requiring identity controls, auditability, private deployment, and formal support.

It is less suitable as a sole security measure when you require all ten OWASP Agentic risks today, a managed scanning service, or a published subscription price. Two listed risks remain under development, and the self-hosted model leaves deployment and operations with the buyer.

Pros and cons

Pros

• 153 vectors across 11 modules: Provides unusually wide agent-focused coverage for a free core engine.
• Tests real behavior: Tool calls, side effects, and outcomes can reveal risks that output-only checks overlook.
• Fast, automatable scans: Ninety payloads in under 60 seconds and a GitHub Actions threshold support frequent gating.
• Useful evidence: Grades, severity, OWASP mapping, and reproduction steps help teams prioritize and fix findings.
• Private entry point: Linux self-hosting, no signup, and no default telemetry suit sensitive development.

Cons

• Coverage is not complete: Two of ten OWASP Agentic risks are still being developed.
• Operations stay with you: Self-hosting avoids cloud dependency but requires your team to run the scanner and manage its environment.
• Advanced plans lack public prices: Team and Enterprise budgeting depends on custom quotes.
• Hosted oversight is paywalled: Drift monitoring, dashboards, alerts, and enterprise controls are not part of Community.

Alternatives

AI Security Testing Tools is the broader category to survey when you want to compare multiple approaches.

• F5 BIG-IP APM is a paid platform with a free trial and deployments spanning mobile, desktop, web, API, Linux, and self-hosted environments; choose it when access management breadth matters more than a free agent-testing core.
• Project Moonshot is free with no trial fee and supports API, desktop, web, and self-hosted environments; consider it when you want a free alternative with wider platform reach.
• AgentScan offers a free plan at no cost with five scans monthly, 185 vectors, five categories, auto-detection, and JSON results; pick it when a hosted API/web workflow and a defined monthly allowance fit better.
• OpenSecureAI Scanner has a Pro plan at $49 a month with 50,000 API requests, hosted remediation, and an LLM gateway; choose it when managed API capacity is the priority.
• PromptGuard offers 20,000 free scans per month, one API key, one project, and 24-hour log retention; it fits teams prioritizing high-volume scanning and short-term logs.
• RedForge is free Apache 2.0 software installed with pip.
• AIRTA Red Team is free open source with no license fee or subscription and uses your own LLM API key.
• AIRTaaS is a free web service.

Verdict

Crucible is the right choice for builders who want broad, agent-specific attack coverage, reproducible findings, and CI enforcement while keeping scans local. Start with Community for a capable free baseline; move to Team or Enterprise only if monitoring, governance, or dedicated support justifies custom pricing. Look elsewhere if complete OWASP coverage, a managed hosted experience, or predictable published costs is more important than self-hosted control.