Runtime guardrails and AI firewalls · #12 by signal score
CalypsoAI
Runtime guardrails for AI inference: inspects prompts, outputs, and agent tool calls, blocks unauthorized tool calls, and logs every enforcement decision with its reasoning. Acquired by F5 in 2025; now sold as F5 AI Guardrails.
Acquired by F5, announced 2025-09-11, closed 2025-09-26 ($145.2M, per SEC filing). Now sold as F5 AI Guardrails.
19Signal score / 100
- Capital
- 9.1/35
- 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: IE
Funding: $38.2M disclosed, latest Series A-1
Product: F5 AI Guardrails
Sources
- F5 AI Guardrails (vendor, accessed 2026-09-23)
- F5 to acquire CalypsoAI to bring advanced AI guardrails to large enterprises (sec, accessed 2026-09-23)
- CalypsoAI raises $23 million for AI security tech (trade-press, accessed 2026-09-23)
- F5, Inc. Form 10-K for the fiscal year ended September 30, 2025 (sec, accessed 2026-09-23)
Last verified 2026-09-23.