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Salus

Salus is a runtime authorisation layer for AI agents that checks consequential tool calls against policy, session evidence and intent before execution, and returns exact corrections to the agent.

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Introduction

Salus sits between an agent and the actions it takes. It checks policy, evidence and intent at runtime, returns exact fixes to the agent and stops wrong actions before they become real.

Its demo shows an agent about to book a $299 reservation from a stale itinerary. Salus holds the action because live availability was never verified, returns the missing step, and the agent searches live inventory, finds the new $375 price and completes the booking correctly. Plans include unlimited seats with allowances of registered agents and monthly action checks.

Launch and background: Y Combinator’s company directory lists Salus in its Winter 2026 batch, with the one-liner “Guardrails to validate your agent’s actions before they execute”.

Features

  1. Pre-execution checks: Validate consequential tool calls.
  2. Policy and evidence: Rules plus session context.
  3. Exact corrections: Tell the agent what is missing.
  4. Sandbox: Try policies safely.
  5. Unlimited seats: Plans priced by agents and checks.

Pros

  1. Prevents real damage: Stops wrong actions, not just bad text.

Cons

  1. Price: Plans start at $500 a month.
  2. Integration work: Tool calls must route through Salus.
  1. Register your agent and its consequential tools.
  2. Write policies for evidence each action needs.
  3. Test in the sandbox, then enforce in production.

Resources:

Pricing

Salus lists plans at $500 a month and $2,500 a month with unlimited seats; the Pilot plan is month-to-month.

  1. Teams letting agents book, pay or change records.

Conclusion

Salus is a guardrail for actions rather than words, which matters as agents gain tool access.

Treat it as a production control alongside pre-release evals.

On CheckOps, Salus is filed under the Production monitoring & observability and Security testing stages. Related tools listed here include Guardrails AI, NeMo Guardrails, Lakera, Open Policy Agent, Promptfoo and Giskard. When comparing them, weigh the licence, the languages and platforms each supports, whether it is self-hosted or managed, and how cleanly it slots into your existing CI pipeline. Details on this page were checked against the official website, documentation and repository on 11 November 2026.

Alternatives

Other tools on CheckOps that cover similar ground. Open a page, or compare one with Salus side by side.