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

Beyond annotations, the description adds privacy and access constraints: constant, public, official SDK initialization only, and no private data, account, tool, or provider access. It does not explain what 'display' concretely means, but annotations already cover read-only, idempotent, non-destructive, and closed-world behavior.

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, front-loaded with the action and followed by access constraints. 'Official SDK initialization only' is slightly opaque, but the text is not padded or redundant.

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 and rich annotations, the description supplies the essential purpose and access exclusions. It still lacks when-to-use context and detail about what the diagnostic displays, but the structured metadata covers most remaining needs.

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 tool has zero parameters and schema coverage is 100%, so the baseline is 4. The description does not need to add parameter semantics.

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 states a specific verb and resource: it displays a public UI diagnostic. It does not name or differentiate a sibling, but no sibling appears to be a diagnostic tool. The phrase 'constant public UI diagnostic' is somewhat vague about what diagnostic is shown.

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 explicit guidance on when to use this tool, when not to use it, or which sibling to choose instead. The constraints imply a public diagnostic context, but they do not route the agent to this tool or explain the triggering scenario.

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