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Free ebookCoding AgentsSandboxSecurity

Secure shell execution for coding agents

Sandbox, timeout, allowlist, and audit: the shell-execution layer that lets coding agents run commands without risking the host.

Inside the ebook

What you get

  • Design a shell tool contract that is safe by default
  • Isolate execution via containers or bubblewrap with minimal overhead
  • Enforce CPU, memory, and wall-time limits in code
  • Apply a layered command allowlist per environment
  • Produce auditable run logs per agent turn

Inside

  • Why shell is the agent attack surface
  • The sandbox contract: four limits
  • Container or rlimit: picking the isolation level
  • Command allowlist by environment
  • Filesystem and network scoping
  • Audit log and blast-radius review
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