Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Beyond the annotations, it discloses important defaults: omitted rules start with SSH and ping open from anywhere, rules: [] creates no rules, and the firewall has no effect until attached. It also states the required scope, network.write.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is four compact sentences, front-loaded with the core action and followed by the most important defaults and scope. There is no wasted wording.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a creation tool with annotations and no output schema, the description covers the critical behavioral details an agent needs before invoking it. It does not describe the return value or idempotency, but those are minor gaps given the available schema and sibling tools.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema lacks top-level parameter descriptions, so the description adds meaningful semantics for the rules parameter, especially the default behavior when omitted and the special meaning of rules: []. The name parameter remains undocumented but is obvious from the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource: creates a reusable set of inbound and outbound rules. It also clarifies that the firewall itself does not filter traffic until attached, which distinguishes creation from attachment and use.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

It clearly establishes the creation context and explains that nothing is filtered until the firewall is attached. It does not explicitly name update_firewall or attach_firewall as alternatives, but the use context is clear.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.