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

readOnlyHint=true already tells the agent this is a safe read with no side effects, so the bar is lower. The description adds that the content is explanatory (definition, trust.json contents, application steps) but says nothing about the shape or length of the informational response.

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?

One short sentence with no filler, and the content scope is front-loaded. It loses a point only for being a sentence fragment rather than a declarative statement of what the tool does.

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, read-only tool the description covers the essentials, but with no output schema an agent still cannot tell what it will actually receive (prose, JSON, or a payload) or how long it is. Marginal but real gap.

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?

Parameter count is 0, which is the baseline-4 case: there is nothing for the description to disambiguate and no arguments to get wrong.

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 enumerates the exact topics this tool answers – what CGBB is, what the free trust.json contains, and how to apply. That scope is specific enough to distinguish it as an informational/discovery tool, though it is written as a noun phrase rather than a verb+resource statement and never names the sibling tools it is not (get_trust_file, apply_for_membership).

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?

There is no when-to-use or when-not-to-use guidance. The phrase 'how an AI agent can apply for a brand' could easily be misread as the action tool, when apply_for_membership is the actual sibling for that, so the boundary is not drawn anywhere.

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