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Show HN: Sandboxing untrusted code using WebAssembly

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Capsule A secure, durable runtime for AI agents Getting Started • Documentation • Contributing

Overview

Capsule is a runtime for coordinating AI agent tasks in isolated environments. It is designed to handle, long-running workflows, large-scale processing, autonomous decision-making securely, or even multi-agent systems.

Each task runs inside its own WebAssembly sandbox, providing:

Isolated execution : Each task runs isolated from your host system

: Each task runs isolated from your host system Resource limits : Set CPU, memory, and timeout limits per task

: Set CPU, memory, and timeout limits per task Automatic retries : Handle failures without manual intervention

: Handle failures without manual intervention Lifecycle tracking: Monitor which tasks are running, completed, or failed

This enables safe task-level execution of untrusted code within AI agent systems.

How It Works

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