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Crucible

Freemium#8 of 29 in AI Security Testing Tools

Crucible: A broad CLI for testing agent attack lifecycles locally and in CI/CD. Ranked #8 of 29 in AI Security Testing Tools by our editors (8.4/10); pricing: Free plan; best for agent teams testing complex attack lifecycles.

8.4/10Editor score

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Crucible8.4 Visit Crucible

At a glance

Editor score
8.4 / 10
Pricing
Free plan
Best for
Agent teams testing complex attack lifecycles
Free plan
Yes
Prompt injection tests
Yes
Facts checked
21 Sep 2026

Where it wins
- 153 attack vectors across 11 modules in the Community plan
- Covers prompt injection, jailbreaks, MCP abuse, and poisoning attacks
- JSON and HTML reports with severity findings and OWASP mappings
Where it doesn't
- Team features are listed as Early Access
- Hosted dashboards are upcoming or early-access functionality
- Enterprise pricing is custom rather than publicly stated

Our verdict on Crucible

Crucible is an open-source Python CLI for testing AI agents before production. It runs adversarial payloads against HTTP or MCP-accessible agents, covering prompt injection, jailbreaks, unsafe content, tool misuse, memory poisoning, MCP risks, behavioral drift, and multi-turn attacks. It is aimed at agent teams that need repeatable security checks across development and CI/CD, with support documented for LangChain, CrewAI, AutoGen, and raw MCP endpoints.

The Community plan costs $0 per month and includes the full CLI and test modules, 153 attack vectors across 11 modules, local and CI reports in JSON and HTML, and Community Discord support. Its testing scope is notably broad: Crucible includes direct and indirect injection payloads, safety-policy bypass tests, toxicity and content-safety checks, MCP server scanning, memory and RAG poisoning lifecycle tests, and configurable CI/CD failure thresholds. Team adds drift monitoring, Slack alerts, regression tracking, hosted dashboards, historical trends, and priority support. Enterprise adds SSO, audit logs, on-premises or VPC deployment, custom attack modules, SLAs, and dedicated security engineering support.

Crucible fits teams that want a self-hosted testing workflow and explicit findings, grades, reproduction steps, and OWASP mappings rather than a narrow prompt-only checker. Its integrations cover common agent frameworks plus MCP, Slack, and CI/CD, giving teams several ways to place scans into an existing development process. The Team tier is listed as Early Access, and hosted dashboards are described as upcoming or early-access functionality. Teams needing those capabilities immediately, or a platform beyond HTTP and MCP-accessible agents, should evaluate alternatives; teams focused on complex, multi-stage agent threats should consider Crucible.

Your product? Our editors can test Crucible in depth and publish a review, labelled as paid · from $149/mo →

Crucible pricing

Plans Free planFreemium A usable free plan; paid tiers unlock the limits above. Prices checked 21 Sep 2026.

See plans on crucible-security.github.io

All 3 Crucible plans and prices →

Crucible fact sheet

Free plan	Yes
Paid from	Not verified
Prompt injection tests	Yes
Jailbreak tests	Yes
Data leakage tests	Not verified
Unsafe output tests	Yes
Custom test cases	Yes
Deployment mode	Self_hosted
Deployment	Self-hosted
Support	Community, Docs
Built for	Solo, Small business, Mid-market, Enterprise (editorial estimate)
Integrations	6 integrations: LangChain, CrewAI, AutoGen, MCP, Slack, CI/CD
Pricing	Free plan (source)
Website	crucible-security.github.io
Facts checked	21 Sep 2026

Crucible integrations

Crucible lists 6 integrations on its own site.

LangChain
CrewAI
AutoGen
MCP
Slack
CI/CD

Alternatives to Crucible

See all Crucible alternatives →

Crucible vs the competition

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Featured on iTechGuides

Crucible is listed in our AI Security Testing Tools directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update