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

Annotations already provide the readOnly, idempotent, openWorld, and non-destructive safety profile. The description adds valuable behavioral context: no API key is needed, the tool is safe to call immediately, and the catalog includes tools callable via tools/call. This goes beyond what annotations alone convey.

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 dense and front-loaded with the most actionable fact: no API key needed. The topic enumeration is somewhat redundant with the schema, but the rest of the description earns its place by explaining catalog vs. sequence behavior and the tools/list distinction.

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 simple guide tool with zero required parameters, a rich output schema, and strong annotations, the description covers invocation modes, topic semantics, and the relationship to tools/list. There is no meaningful gap preventing an agent from calling it correctly.

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?

Schema description coverage is 100%, and the single optional topic parameter is clearly documented in the schema. The description repeats the topic list and adds 'buy' and 'benchmark' variants, but it does not add substantial meaning beyond the schema definition.

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 names the resource ('full A2AWire tool surface') and specifies the action: call with no topic for a categorized catalog, or with a topic for a recommended call sequence. It also distinguishes itself from tools/list by clarifying that it lists every callable tool, not just always-on essentials.

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?

The description gives explicit call patterns: omit topic for the full catalog, pass a topic keyword for a flow-specific sequence. It also explains when to prefer this over tools/list, though it does not explicitly enumerate when not to use sibling tools like discover_agents or get_recommended_action.

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