gemini_usage

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

With no annotations provided, the description carries the burden of behavioral disclosure. It states it returns token usage stats and rate limit status, which discloses output behavior. However, it doesn't specify whether this is a read-only operation (likely implied), whether it consumes quota, or what the exact response structure is. The described return content is somewhat disclosed but not fully.

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 brief sentences, zero filler, front-loaded with the primary purpose. Every word earns its place. This is appropriately concise for a zero-parameter utility 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?

The tool has 0 parameters and a rich output schema (present), so the description doesn't need to explain return format in detail. For a simple read-only stats tool, the description covers purpose and general return content adequately. Slightly more could be said about rate limit semantics, but it's not critical.

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?

There are 0 parameters, so schema description coverage is trivially 100%. The description adds value by explaining what the tool returns (token usage and rate limit status), which is meaningful even with no parameters. For a no-param tool, there's nothing more params could require, so this is well-served.

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 it retrieves Gemini API usage statistics including token usage and rate limit status. The verb 'get' plus resource 'current Gemini API usage statistics' is specific. It's distinct from sibling tools which are all vision/file/message-related, so no confusion with siblings is likely, though it doesn't explicitly name them.

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 its usage context (checking API usage/rate limits) but provides no explicit when-to-use vs alternatives guidance. However, given the sibling tools are all content/file generation tools, the purpose differentiation is reasonably obvious, so it's acceptable but not explicitly stated.

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