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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and non-destructive behavior. The description adds meaningful behavioral context: no API key is required, the tool returns lightweight catalog/sequence information, and tools/list only exposes a subset of what this guide can enumerate. This is exactly the kind of context that helps the agent trust and invoke the tool correctly.

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 compact and front-loaded with the most decision-relevant fact ('No API key needed'). Every sentence earns its place: purpose, no-topic usage, topic usage, and the tools/list vs tools/call distinction are all covered without excess.

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 single optional parameter with a rich schema and clear annotations, the description is complete. It tells the agent exactly what to pass, what to expect in return, whether authentication is needed, and how the results relate to other invocation paths. No critical operational detail is missing.

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%, so the baseline is 3. The description restates the optional topic parameter and explains the distinction between omitting it and passing a keyword, but it also lists 'buy' and 'benchmark' as valid topics while the schema description omits them, creating a minor inconsistency that an agent might trip on.

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 identifies the tool as a navigator/guide for the A2AWire tool surface, stating exactly what it returns: a categorized catalog of every callable tool or a recommended call sequence for a topic. It distinguishes itself from sibling tools by framing itself as the discovery and routing entry point rather than a workflow executor.

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 guidance: call with no topic for the full catalog, or pass a specific topic keyword for a recommended sequence. It also clarifies the relationship to tools/list and tools/call, which helps the agent decide when this tool is useful versus other discovery mechanisms.

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