Each tool targets a clearly distinct security capability: shell execution, filesystem operations, network fetching, policy pre-checking, and audit inspection. Although safe_exec could overlap with safe_fs or safe_fetch via shell commands, the sandbox descriptions make the intended boundaries clear.

All tools use snake_case with a consistent sentinel_ prefix, which is highly predictable. The pattern shifts slightly from sentinel_safe_<action> for operational tools to sentinel_<noun>_<verb> for policy and audit tools, but remains readable and coherent.

Five tools is well-scoped for a security gateway, covering execution, filesystem, network, policy, and audit without redundancy. Each tool earns its place in the minimal surface.

The core agent action surfaces are covered, plus policy evaluation and audit inspection. Minor gaps exist: safe_fs lacks explicit delete/remove, and there is no tool to manage policies or reset circuit breakers, but agents can likely work around these limitations.