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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=false, and destructiveHint=false, so the safety profile is covered. The description adds that bundles are grouped by domain and that there are 500+ tools, but it does not disclose response format, pagination, or whether bundles are static or user-specific; with an output schema present, return details are less critical, making this a modest addition.

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?

Two tightly written sentences: the first states purpose and structure, the second states usage. It is front-loaded and contains no wasted words.

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 discovery tool with an output schema and full safety annotations, the description covers its purpose and usage adequately. The main omission is that it does not state the natural next step of using get_bundle_tools after selecting a bundle, but the tool can still be invoked correctly from what is provided.

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 effectively takes no parameters, and the schema's single placeholder property is fully documented as 'No parameters needed' at 100% coverage. The baseline for zero real parameters is 4, and the description appropriately does not need to explain parameter usage.

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 (List) and resource (tool bundles) with the additional scope that they are grouped by domain, so an agent knows exactly what will be returned. However, it does not explicitly differentiate from the close sibling get_bundle_tools, which retrieves the tools inside a bundle rather than listing the bundles themselves.

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 clear usage context: use this to discover tools for a specific topic instead of browsing all 500+ tools. That names an alternative (manual browsing), but it does not mention when not to use it or explicitly point to get_bundle_tools as the follow-up for retrieving tools within a chosen bundle.

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