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

Annotations already mark this as read-only, non-destructive, open-world, and idempotent, and the description adds meaningful context: no API key is required, the tool only lists/recommends rather than executing anything, and tools/list is a limited subset. This fully sets expectations for side effects and invocation.

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?

Five short, information-dense sentences, with the most important signal front-loaded: 'No API key needed — call this now.' Every sentence contributes usage guidance or scope clarification, 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?

Given one optional parameter, strong annotations, a documented output schema, and a simple guide role, the description covers all necessary invocation contexts: no-topic catalog mode, topic-specific sequence mode, and the relationship to tools/call and tools/list. No critical behavior is left undocumented.

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?

With 100% schema description coverage, the schema already documents the optional topic parameter and its valid keywords. The description adds value by expanding the keyword set, explaining that topics map to recommended call sequences, and clarifying that omitting the parameter returns the full catalog.

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 identifies the tool as a 'Navigator for the full A2AWire tool surface' and specifies exactly what it does: with no topic it returns a categorized catalog of every callable tool, and with a topic it returns a recommended call sequence. This is a specific, actionable purpose and distinguishes it from execution-oriented siblings.

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 gives explicit usage modes: call with no topic for the catalog, or pass one of the listed topics for a call sequence. It also clarifies that tools/list shows only always-on essentials and that listed tools are invoked via tools/call. It does not explicitly contrast against every sibling, but the core decision is covered.

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