Runtime guardrails and AI firewalls · #14 by signal score
Prompt Security
AI firewall and usage control for employee AI tools, coding assistants, and homegrown AI apps: blocks adversarial prompts, scrubs sensitive outputs, and keeps a log of agent actions. Acquired by SentinelOne in 2025.
Acquired by SentinelOne, announced 2025-08-05, closed 2025-09-05 ($160.2M, per SEC filing). Now sold as Prompt Security, part of the SentinelOne Singularity Platform.
16Signal score / 100
- Capital
- 6/35
- Product
- 10/25
- Standards
- 0/20(not yet assessed)
- Momentum
- 0/20
Identity primitives
| Agent as a first-class identity | Not checked |
| On-behalf-of token exchange | Not checked |
| Cross App Access (ID-JAG) | Not checked |
| Asynchronous human approval (CIBA) | Not checked |
| MCP authorization conformance | Not checked |
| Fine-grained authorization | Not checked |
| Short-lived, secretless credentials | Not checked |
| Token vault | Not checked |
| Kill switch | No public claim found |
| Per-action audit chain | No public claim found |
Company
HQ: IL
Funding: $23M disclosed
Product: Prompt Security
Sources
- SentinelOne: Prompt Security (vendor, accessed 2026-09-23)
- Prompt Security (vendor, accessed 2026-09-23)
- SentinelOne to acquire Prompt Security to advance GenAI security (press-release, accessed 2026-09-23)
- M&A spotlight shifts to Lasso, Aim, and Pillar after SentinelOne's $250M Prompt deal (trade-press, accessed 2026-09-23)
- SentinelOne, Inc. Form 10-K for the fiscal year ended January 31, 2026 (sec, accessed 2026-09-23)
Last verified 2026-09-23.