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tCell is Antigen’s built-in offensive security agent and the recommended starting point for most teams. Your Antigen expert runs tCell against your approved targets and surfaces confirmed vulnerabilities, evidence, and remediation work in the platform and Slack. tCell uses Antigen’s cyber-capable model gateway and runs with Antigen’s default skills and guardrails. Antigen builds tCell with the same Agent SDK available to your team and continually improves it. It performs strongly on public cybersecurity benchmarks.

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What tCell does during a run

tCell investigates your approved targets as an adversary would. It performs reconnaissance, tests the reachable surface, and follows evidence when it finds a potential weakness. When it confirms a vulnerability, Antigen records the supporting evidence and creates a live vulnerability for your team.

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tCell and your Asset Map

Your organization’s Asset Map gives tCell context about the infrastructure behind a target. It can use services, identities, deployments, and their relationships to investigate how an exposed issue could affect the rest of your environment.

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Building custom agents

You can also build and deploy custom agents with the Agent SDK. Custom agents run in the same Antigen environment and can access your organization’s Asset Map. Use the SDK when you need to extend Antigen with your own skills, guardrails, or workflows.