configure_api_key

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

With no annotations provided, the description must carry the behavioral disclosure burden. It does add useful context by stating the key is stored locally and persists across sessions, but it does not mention overwrite behavior, security implications, or what happens if an invalid key is provided.

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 two concise sentences with no filler. The primary action and scope are front-loaded, and the persistence detail is a valuable addition that earns its place.

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 configuration setter with a single parameter and no output schema, the description covers the essential behavior: what it does, where the key is stored, and that it persists. It could mention that this key is required before using generate_image, but the sibling context makes that inference straightforward.

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 already provides 100% coverage for the single parameter, including a clear description and a URL for obtaining the key. The tool description does not add additional parameter semantics, which is acceptable given the schema's completeness.

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 ('Set or update') and names the exact resource ('Gemini API key for image generation'), making the tool's purpose immediately clear. It also distinguishes itself from sibling tools like configure_openai_api_key and configure_google_login.

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 clearly implies this tool is used to configure the Gemini key needed for image generation, and that it can be used both for initial setup and updating an existing key. It does not explicitly name when not to use it or direct to alternatives, so it misses the top score.

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