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

Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered, but the description adds real behavioral context: results are empty during server creation, the read scope is firewall:read, and a free GPU Cloud account plus MCP key is required. It stops short of describing return format or pagination, which would push it higher.

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?

Three compact fragments with no redundant prose, and the resource identity is front-loaded ahead of the state caveat and permission note. It is appropriately sized for a single-parameter read tool.

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-parameter read-only list with no output schema, the description plus annotations cover what an agent needs: scope, safety profile, state caveat, and auth requirement. Only the return shape and pagination behavior are left unspecified, a minor gap for this tool class.

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 description coverage is 100%, and the serverId description already tells the agent to source the id from gpucloud_list_servers. The description adds nothing about the parameter, 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?

The phrase 'Firewall (security) rules of a server' clearly identifies the resource and implies a read/list operation, distinguishing it from the sibling mutations gpucloud_add_firewall_rule and gpucloud_delete_firewall_rule. It omits an explicit verb like 'list', so it falls just short of the crispest possible statement of intent.

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 resource name; the description never states when to call this versus the add/delete firewall siblings or what prerequisite states exist. The one useful context nugget, that results are empty while the server is being created, is a state caveat rather than routing guidance.

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