Hiver

Hiver is a tool designed to provide observability and debugging capabilities for agents by enabling replay of browser actions, file changes, network requests, tool calls, and approvals. It addresses the challenge that traditional logs do not fully capture the sequence and context of agent operations, offering a timeline-based replay system instead. The platform is aimed at developers building agents that interact with a range of environments and require reliable, auditable workflows.

The tool offers instant runtime environments, allowing agents to start in milliseconds without the need for pre-warming. Hiver supports governed workspaces, giving agents controlled access to files from various file systems, with access control lists that can be set as read-only, write-only, or scoped by user, team, organization, or workflow. Actions performed by agents can be policy-gated, enabling the enforcement of rules around network access, credential protection, and the use of files, APIs, and tools. This governance is designed to help maintain security and compliance within agent workflows.

Hiver is delivered as a command-line interface, installable via npm for local development. It supports integration with different agent stacks and development kits, including Claude, Codex, Copilot, browser-based agents, and custom agent loops. The tool enables developers to build, observe, and debug agents locally and then deploy the same code to cloud environments. By providing end-to-end replay and governed environments, Hiver aims to help developers build agents that can perform real work reliably and securely.

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