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

Annotations declare a non-read-only, non-idempotent, non-destructive write. The description is consistent and adds substantial context beyond them: no signup flow, the key is returned once and must be kept, a 100-calls-per-day quota, and that the key can be injected as apiKey or a Bearer header with no reconnect. It stops short of describing key expiry or what happens on repeat calls, which keeps it from a 5.

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 front-loaded with a 'WHEN TO CALL' clause, then purpose, then operational details. Every sentence carries actionable information, and no sentence repeats the schema or annotations. Density is high with no filler.

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?

With no output schema, the description takes responsibility for the return value by saying it returns the key plus exactly how to use it on the next call. For a single-optional-parameter, non-destructive minting tool, nothing an agent needs to call it correctly is missing.

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 is one parameter and schema coverage is 100%, so the schema already defines 'label' with its own example. The description adds no extra meaning about the label field. The baseline of 3 is appropriate given the schema carries the full parameter burden.

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 and resource ('Mints a free Glimind API key in one call') and immediately clarifies the differentiator versus siblings ('no signup, no form'). An agent can distinguish this from credential-adjacent siblings like call_remote_tool or how_to_use_glimind without opening any schema.

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?

Explicit trigger conditions are given: 'when call_remote_tool says quota_exceeded, or before heavy use.' It names the sibling that signals the need and describes the follow-up path. There is no ambiguity about when this tool should fire versus other options.

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