setup_api_key

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

No annotations are provided, so the description must carry the full burden. It says only 'Configure AdButler with an existing API key,' but does not disclose what 'configure' entails—e.g., whether it validates the key, persists it, makes network calls, or overwrites existing settings. This leaves behavioral ambiguity for a mutation-like setup action.

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 short sentences, front-loaded with the purpose, and includes usage context. Every sentence earns its place with no wasted words.

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 single-parameter tool with no output schema or annotations, the description covers the primary use case. However, it omits any mention of what happens after configuration (e.g., key storage, validation, or error handling), leaving an agent to infer the tool's side effects.

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 coverage is 100% with api_key described as 'The AdButler API key.' The description adds no extra semantic detail beyond the schema, so the baseline of 3 is appropriate.

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 tool's action ('Configure AdButler with an existing API key') and specifies the resource and object. It also distinguishes from account creation tools by noting 'if the user already has an AdButler account and API key,' setting it apart from siblings like create_trial_account.

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 explicitly states when to use the tool: 'if the user already has an AdButler account and API key.' This provides clear context and implies the alternative (e.g., create_trial_account) for users without an account, though it does not name an explicit alternative.

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