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

With no annotations, the description carries the full burden of behavioral disclosure. 'Return' clearly indicates a read-only operation, and 'anonymous client' implies no authentication. However, it does not mention whether this affects any counters, possible errors, or rate-limit implications. The output schema covers return structure, but additional context on side effects (if any) is missing.

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 that front-loads the action ('Return') and specifies the exact data returned. No unnecessary words or repetition; every element adds value.

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?

This is a simple tool with no parameters and an output schema, so the description is largely sufficient. It clearly states what is returned but could be enhanced with a note on typical use cases (e.g., avoiding rate limits) or a pointer to a sibling like 'service_status' for alternative needs. Given the low complexity, the minor gap is acceptable.

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 tool has zero parameters, so schema coverage is trivially 100%. The description does not need to explain parameters as there are none. Baseline for zero parameters is 4, and nothing in the description detracts from this.

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 uses a specific verb ('Return') and clearly identifies the resource ('quota usage') with time granularities ('hourly, daily, weekly, and rolling 30-day'). It distinguishes from siblings like 'scrape' and 'service_status' by focusing on usage quota rather than content or service health.

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?

The description implies the tool is for checking quota usage, but it does not explicitly state when to use it or provide alternatives. Since the sibling tools exist (e.g., 'service_status'), some exclusionary or comparative guidance would improve clarity, but this is not provided.

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