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

Annotations already declare readOnly, idempotent, and non-destructive behavior. The description adds the note 'No API key needed', which is context about authentication requirements. It does not contradict the annotations and provides additional useful behavioral clues.

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 relatively concise but includes some promotional language ('call this now') and a redundant mention of the catalog behavior. However, it is structured well, front-loading key information and keeping each sentence purposeful.

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 guide tool, the description is complete. It states what the tool returns, when to use it, and even mentions related capabilities (tools/call vs tools/list). No critical context is missing for an agent to decide to invoke it.

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 description covers the parameter fully, listing valid keywords and the default behavior. The tool description adds context about the recommended call sequences, slightly enhancing the semantic meaning beyond the raw 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 clearly states the tool's purpose as a navigator for the full A2AWire tool surface, returning a catalog or recommended call sequence. It distinguishes itself from sibling tools by being a meta-guide rather than a specific action.

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?

It explicitly explains when to call with no topic (for catalog) and when to pass a topic (for a recommended sequence). This gives clear usage guidance and implicitly suggests that for specific actions, one would use the relevant tool directly.

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