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

Annotations already cover the read-only/open-world profile, and the description adds genuinely new context: the response contents (rules, protected machines) and the status enumeration (applied, pending, error), plus the required vms.read scope. It does not mention latency, pagination, or error behavior for a missing id.

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?

One compact sentence, front-loaded with the resource and immediately followed by the return shape and scope. Zero filler.

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 one-param read tool with no output schema, the description adequately conveys what is returned and the permission needed. A brief note on what happens when the id does not exist would close the remaining gap.

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?

Schema coverage is 100% and the single 'firewall' parameter already documents that the id comes from list_firewalls or create_firewall. The description adds no syntax or format guidance beyond the schema, so the baseline 3 applies.

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?

States a specific resource ('One firewall') and describes exactly what comes back: its rules, the machines it protects, and per-item status. The singular 'one' implicitly distinguishes it from list_firewalls and create_firewall, though no sibling is named.

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?

Usage is only implied by the singular framing and the 'Scope: vms.read' note. There is no explicit 'use this when you have a firewall id and need details; use list_firewalls to find one' style routing, even though list_firewalls is the obvious alternative.

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