SentinelGate

SentinelGate is an in-memory firewall for autonomous AI agents that halts adversarial injections before token spend.

SentinelGate is an in-memory firewall designed to provide cryptographic execution control for high-stakes autonomous AI agents. It evaluates prompt kinematics in-memory to halt adversarial injections and tool hijacks before execution and before token spend. Every action is sealed with tamper-evident Ed25519 evidence bags engineered for financial rails. It is built for developers and organizations running production AI systems who require strict veto enforcement and attestation. Users can integrate it by pointing any OpenAI-compatible client at SentinelGate and swapping the base URL.

SentinelGate at a glance

Best for: Software engineer
Runs on: API, self-hosted
Pricing: Developer free tier; Pro tier with 500,000 requests/month; Enterprise tier with dedicated VPC or On-Premises Bare Metal deployment and custom SLAs.
Released: October 2026
Category: AI agent tool
Website: sentinelgate.dev

Key features

Halt adversarial injections at Token 0
Evaluate prompt kinematics in-memory
Seal actions with Ed25519 evidence bags
Provide sub-millisecond overhead execution control
Support OpenAI-compatible client integration
Generate attestation hashes and evidence bags

Use it for

Protecting autonomous AI agents from prompt injections
Securing high-stakes AI execution environments
Generating tamper-evident audit trails for AI actions

Alternatives to SentinelGate

TaintWall — Enforces deterministic security policies at the tool boundary for AI agents.
AgentGate — Blocks attacks in under 35ms with a local neural classification head.
Aegis Kernel — Stops prompt injection and tool-hijacking at the OS syscall boundary.
ARTEX — Runs autonomous multi-agent penetration testing with a dual-graph architecture.
OpenAPPA — Tracks data flows algebraically to prevent prompt injection without breaking agents.
AgentTrust — Enforces zero-trust policy rules and maintains an immutable cryptographic audit ledger.
CanaryGuard — Defends autonomous AI agents using deterministic heuristic filtering.
Composio — Equips AI agents with tools, managed user auth, and sandboxes across 1,500+ apps
Vigil — Drives end-to-end security engagements with specialist agents and a shared Kali container.
Agent Delegated Authority — It defines cryptographically verifiable authorization receipts and deterministic boundaries.
ARTEX — Manages autonomous penetration testing tasks and tracks vulnerability progress.
Inbin Gate — Prevents unauthorized agent actions by enforcing strict authority checks.

All SentinelGate alternatives