get_firewall_rule

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

The annotation already declares readOnlyHint: true, so the description adds no extra behavioral context beyond what's implicitly known. It doesn't mention anything about the response format, pagination, or error behaviors. Since the annotation covers the safety profile, a 3 is appropriate—the description doesn't contradict but also doesn't enrich beyond the structured data.

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 a single, concise sentence ('Get details of a specific firewall rule') with zero waste. It's front-loaded and easy to parse. For a simple getter, this is appropriately minimal.

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?

Given the simplicity of the operation (a single getter), the readOnlyHint annotation, and complete schema documentation, the description is sufficient. The only minor gap is not explaining that firewall rules are nested resources requiring datacenter/server/NIC IDs, but this is inferable from the required parameters. Overall, it's complete for its complexity level.

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 provides 100% coverage for all 5 parameters, each with a description. The tool description adds no additional meaning about the parameters—it doesn't explain the hierarchy (e.g., that a firewall rule belongs to a NIC, which belongs to a server) or any special constraints. Baseline 3 is correct when the schema carries the full burden.

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 clearly states the verb ('Get') and resource ('details of a specific firewall rule'), which distinguishes it from list operations like list_firewall_rules. However, it doesn't explicitly differentiate from other getters like get_security_group_rule, though the name itself is unambiguous enough. This meets the bar for clear but not exceptional.

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?

No guidance is provided on when to use this tool versus alternatives such as list_firewall_rules or get_nic. There's no mention of prerequisites (e.g., needing datacenter/server/NIC IDs) or any context for why one would retrieve a single rule. The usage context is only implied by the name and parameters.

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