Astrid is a portable, capability-secure operating system for composable software.

Composable agent runtime with enforced isolation boundaries

Production-Ready MCP Server Framework • Build, deploy & scale secure AI agent infrastructure • Includes Auth, Observability, Debugger, Telemetry & Runtime • Run real-world MCPs powering AI Agents

Multi-language agent runtime and library for execution scope management, lifecycle events, and middleware on tool and LLM calls.

Deterministic safety solutions for probabilistic AI agents

pctx is the execution layer for agentic tool calls. It auto-converts agent tools and MCP servers into code that runs in secure sandboxes for token-efficient workflows.