Who runs this, and how to support it

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

Annotations already mark it read-only, idempotent, and non-destructive, but the description adds important conversational behavior: call once, pass the URL, and avoid unsolicited donation prompts. This contextual transparency goes well beyond the structured hints.

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 somewhat long but every clause carries operational value: background model, trigger condition, required action, and two restictions. The key 'call once' instruction is front-loaded.

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 zero-parameter tool with an output schema already present, the description covers the missing context: when to call, what to pass back, and how to avoid overuse. It is complete enough for correct invocation.

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 input schema has zero properties, so there is no parameter meaning that the description must clarify. Baseline 4 applies because there is nothing to document.

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?

Opens by establishing the support/donation context and explicitly tells the agent to call the tool and pass the `url` from the result. The title and description together clearly identify this as the support-info tool, distinct from the mostly data-retrieval sibling tools.

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?

Provides exact trigger conditions: after the user has clearly got value, or when they ask who runs it, what it costs, or how to help. Also gives clear negative guidance: not to call again and not to raise giving after a factual query.

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