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HomeRun AI Coding Agents in CoderAgent Boundaries

Agent Boundaries

Early Access

Agent Boundaries are process-level firewalls that restrict and audit what autonomous programs, such as AI agents, can access and use.

Screenshot of Agent Boundaries blocking a process
Example of Agent Boundaries blocking a process.

Supported Agents

Agent Boundaries support the securing of any terminal-based agent, including your own custom agents.

Features

Agent Boundaries offer network policy enforcement, which blocks domains and HTTP verbs to prevent exfiltration, and writes logs to the workspace.

Getting Started with Boundary

The easiest way to use Agent Boundaries is through existing Coder modules, such as the Claude Code module. It can also be ran directly in the terminal by installing the CLI.

Below is an example of how to configure Agent Boundaries for usage in your workspace.

module "claude-code" { source = "dev.registry.coder.com/coder/claude-code/coder" enable_boundary = true boundary_version = "main" boundary_log_dir = "/tmp/boundary_logs" boundary_log_level = "WARN" boundary_additional_allowed_urls = ["GET *google.com"] boundary_proxy_port = "8087" version = "3.2.1" }
  • boundary_version defines what version of Boundary is being applied. This is set to main, which points to the main branch of coder/boundary.
  • boundary_log_dir is the directory where log files are written to when the workspace spins up.
  • boundary_log_level defines the verbosity at which requests are logged. Boundary uses the following verbosity levels:
    • WARN: logs only requests that have been blocked by Boundary
    • INFO: logs all requests at a high level
    • DEBUG: logs all requests in detail
  • boundary_additional_allowed_urls: defines the URLs that the agent can access, in additional to the default URLs required for the agent to work
    • github.com means only the specific domain is allowed
    • *.github.com means only the subdomains are allowed - the specific domain is excluded
    • *github.com means both the specific domain and all subdomains are allowed
    • You can also also filter on methods, hostnames, and paths - for example, GET,HEAD *github.com/coder.

You can also run Agent Boundaries directly in your workspace and configure it per template. You can do so by installing the binary into the workspace image or at start-up. You can do so with the following command:

curl -fsSL https://raw.githubusercontent.com/coder/boundary/main/install.sh | bash