Capsule Security

Runtime protection for AI agents against prompt injection, malicious tool calls, and data theft.

Capsule adds a safety layer around running AI agents, inspecting their inputs and actions to stop prompt injection, unauthorized tool use, and exfiltration attempts as they happen. It targets teams putting agents into production who need guardrails beyond model-level safety. Founded in 2025, it raised a seed round in 2026.

Category: Agent Security & Governance
Founded: 2025
Funding: $7M raised (Seed, 2026)
Website: https://www.capsulesecurity.io

Seen at Black Hat USA 2026 (Startup City sponsor, booth 5806).

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