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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered structurally. The description adds the useful fact that this is a listing scoped to a single server and previews the returned fields (there is no output schema), but says nothing about pagination limits, permissions, or ordering beyond what the schema states.

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?

Two compact fragments with zero padding: the resource/field list comes first, followed by the endpoint. It is front-loaded and easy to scan, though the raw endpoint string adds little for an agent that already has the tool binding.

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 simple 3-parameter read-only list tool with full schema coverage and no output schema, the field enumeration is the meaningful completion piece and it is present. Missing only optional depth such as pagination semantics in prose, which the schema already covers.

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% – page, per_page (1-40) and server_id are all documented in the schema, including the next_page chaining hint. The description adds no parameter meaning beyond that, 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 description names a concrete resource (a server's firewall rules) and enumerates the attributes each rule carries (type global/rich, port, protocol, IP, action), so the agent knows exactly what it is fetching. It does not, however, distinguish itself from the closely related runcloud_list_blocked_ips sibling, leaving that routing decision to inference.

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?

There is no when-to-use guidance, no prerequisites (e.g., the server must exist), and no mention of alternatives such as runcloud_list_blocked_ips for IP-level blocks. The API endpoint hint (GET /servers/{id}/security/firewalls) gives context but is not usage guidance.

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