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If you only read one page

This page tells you, in a few minutes, what Stalwart does. Each point links to the chapter that explains it in full, so you can go deeper wherever you need to.

For developers

Stalwart also has tools for teams that build AI agents, reached with an API key:

  • The Bot Builder builds an agent of your own from tools you already have: Python functions, MCP servers, OpenAPI operations, LangChain tools or a TypeScript project, described in a single agent.yaml file (chapter 30). Every tool call it makes is checked against your rules: allow, confirm or refuse (chapter 32).
  • The Guardrail checks every tool call an LLM agent makes before it runs: your list of tools, their arguments, your rules, what the conversation already did, and whether each value in a write was actually said. It answers allow, ask the person, or refuse, naming the rule. It works on its own, in front of MCP tools through stalwart gateway, or inside a Guardrails AI guard, and an MCP server lets you ask what it checks and measure it on your own traces (the guardrail). The same check guards any LLM agent's calls, not only agents built here.
  • Agent Graph Verification reports any route through an agent that reaches a tool without the check it should pass, before the agent runs (chapter 47).
  • The Guardrail Bug Hunter searches the guardrail rules you already run for every way through to an action they were meant to stop (chapter 28).
  • Guardrail Verification proves an action cannot happen without the condition that should guard it, or shows how it can (chapters 3 to 12); Guardrail Writing turns a rule in plain words into a checked policy (chapter 13); Random Forest Verification checks a trained random forest against properties you state (chapter 14).

The developer quickstart takes you through them in about half an hour. When Stalwart proves that something cannot happen, it gives you a certificate you can check with no key, no network and none of our software: read the specification, or run the reference checker over the real certificates in the corpus.

Your account

To start, register your interest at stalwart.it; we write back with your access, and you then sign in to the developer console with Google or with a link we email you. Chapter 40 says what each plan includes, and chapter 16 says what we keep, for how long, and what we never keep.