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

The description discloses important behaviors beyond the annotations: the key is shown only once, implying it cannot be retrieved later. It also states the max of 3 keys per email and the free 200 calls/month quota, giving the agent a clear picture of side effects and limitations. This adds significant value beyond the annotations.

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 sentences, with the main action front-loaded. Every sentence adds critical information: what the tool does, how to use the key, and the quota/limit. 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 one-parameter tool with no output schema, the description fully covers the purpose, usage, and constraints. It explains the key's format, how to authenticate with it, and the per-email limit, leaving no significant gaps for an agent to be misled.

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 covers the 'email' parameter with a description. The tool description adds meaning by explaining that the key is tied to the email and that there is a max of 3 keys per email, which clarifies the relationship between the parameter and the tool's behavior. This goes beyond a simple restatement of the schema.

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 'Mint' and clearly identifies the resource: a free Thisispaper Intelligence API key. It also specifies the purpose (for an email address) and the rate limit, making it distinct from the sibling tools which are all about searching or fetching content.

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 provides concrete usage guidance: the key is used as 'Authorization: Bearer tip_live_...' and is limited to 3 per email. It implies this is the tool to obtain an API key, but it doesn't explicitly state when not to use it or mention alternatives. Still, the context is clear enough for an agent to select it appropriately.

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