Substructure
Substructure is an open-source engine for declaring, executing, and hosting durable AI agents in the cloud or self-hosted environments.
Open productWhat it does
About Substructure
Substructure provides an engine designed for developers to create, deploy, and manage AI agents for team use. Agents are declared using a configuration file and can run locally, in the cloud, or self-hosted on private infrastructure. The system handles tool execution via Model Context Protocol integrations without exposing API tokens to user code, and natively emits AG-UI events for custom frontends. Teams can interact with agents directly within Slack channels or direct messages, while custom webhooks allow backends to intercept and control agent decisions.
- Availability:
- launched
- Access:
- free trial
- Format:
- software
Pricing at launch: Substructure includes a 14-day free trial with 500 turns. After the trial, it uses a flat monthly price where users bring their own LLM API keys.
Core capabilities
Declarative Agent Configuration and Loop Control
Developers can declare AI agents using a substructure.toml file and configure webhooks to route agent decision requests to custom backend code.
MCP Tool Authorization and Execution
Integrates with Model Context Protocol (MCP) servers to execute tools and manage authorization without exposing API tokens to user code.
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