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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the description does not need to repeat safety information. It adds that the tool lists parameters, which is a useful hint, but does not describe return format or scope in detail. This is minimal added context beyond annotations.

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 only two short sentences: the first states the action, the second conveys importance. No filler or redundant content, making it highly concise and well-structured.

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 no-parameter listing tool with no output schema, the description adequately covers purpose and usage context. A minor ambiguity exists about which tools are included (only docs_* versus all SDK tools), but the name and sibling context help clarify. Overall complete for its simplicity.

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 has zero parameters, so the schema provides complete coverage. The description correctly omits parameter details, as there are none to explain. Baseline 4 applies for 0-parameter tools.

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 'List all SDK documentation tools with parameters' uses a specific verb (List) with a clear resource (SDK documentation tools). It distinguishes the tool from data-retrieval siblings by indicating it is a meta-tool for discovering available tools.

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 phrase 'Essential for discovering what's available' provides clear context on when to use this tool — during initial exploration. However, it does not explicitly mention alternatives or when not to use it, but for a simple discovery tool this is sufficient.

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