Reynforce and agent-platform supervisors: Sierra and Decagon
Sierra and Decagon check their own agents from the inside. Reynforce works across every agent you run, on any platform, with one list of what's true and one record of every promise.
The problem
The buyer doesn't care which platform said what. They see one company.
What Sierra and Decagon do
Sierra runs "supervisors" beside its agents. In Sierra's words, "Supervisors run in parallel, reviewing each response as it's generated, verifying facts, enforcing policy", stepping in or "escalating to a human when needed." Monitors then review every conversation afterwards, including "grounding in fact — do they stick to verified knowledge?"
Decagon uses Agent Operating Procedures. "An AOP is a step-by-step set of natural language instructions backed by code." They're "the playbooks that allow Decagon agents to resolve complex, multi-turn conversations reliably at scale", "equipped with guardrails to keep sensitive operations safe".
Both are serious, well-built ways to keep a platform's own agent on track.
What Reynforce does
- One list of what's true about your company, shared by every agent. Every line has a named owner and the date someone last checked it.
- Rules for each agent. What it may promise on its own, what needs a person first, and what it may never say.
- One record of every promise, whichever platform the agent ran on. Kept so nobody can edit it.
Side by side
| Sierra and Decagon | Reynforce | |
|---|---|---|
| Which agents it sees | The ones built on that platform | Every agent you run, on any platform |
| What it checks against | Knowledge and procedures set up in the platform | A list your own people own, line by line |
| Who owns the facts | Configuration inside the vendor's platform | Named people in your company |
| What you have afterwards | Flagged conversations and transcripts | A record of every promise, across all agents |
Our view
If your customer-facing agent runs on Sierra or Decagon, their checks are a real strength. Sierra's supervisors are the closest thing on an agent platform to the check Reynforce makes.
Our view is that most companies won't end up with one agent on one platform. They'll have a support agent, an outbound agent, maybe an agent their partner runs, and their own people. A promise made by any of them lands on the same buyer. That's why the list of what's true, and the record of what was promised, should sit outside any one platform.
An agent on either platform could ask Reynforce before it promises a price, a date or a feature, if the platform lets it call an outside tool.
The short version: a platform's supervisor watches its own agent. Reynforce watches what your company promises, whichever agent said it.
What it costs
- Do it yourself: £99 a month per agent. You set it up; a second agent is a second seat.
- Enterprise: ten or more agents. We agree a price with you.
- The 7-Day Agent Approval: done for you, one-off — Complete £7,000 · Standard £4,500 · Starter £2,500. Approved in 30 days, or you don't pay — as long as you complete your part of the setup.
14-day free trial. No card is needed to start, and nothing is charged unless you add one.
Sources
- Sierra, confidence in every conversation, read 20 October 2026
- Decagon, Agent Operating Procedures, read 20 October 2026