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

The annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds valuable behavioral context by describing the return payload (names, descriptions, full input schemas with curated examples) and the fact that results are 'ready to call directly, no second schema lookup needed.' This goes beyond the structured metadata and clarifies what the caller can expect.

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 well-structured: it leads with purpose, then usage scope, then return behavior, then a strategic placement note. The domain list is long but informative. Each sentence carries useful information, though a tighter list of domains could improve conciseness slightly.

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?

The description covers what the tool does, when to use it, what it returns, and how the results are ready to consume. With no output schema present, it effectively explains the return value. It does not mention error behavior or edge cases, but for a read-only discovery tool with solid annotations, this is sufficient.

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 input schema fully documents all parameters, including aliases and examples. The tool description itself does not add additional parameter-level meaning beyond what is already in the schema. Per the rubric, this lands at the baseline of 3.

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 opens with a specific verb+resource combination: 'Find tools by describing the data or task.' It clearly enumerates the covered domains and explicitly frames the tool as a discovery meta-tool, distinguishing it from sibling tools that perform the actual research or data retrieval. The phrase 'Call this FIRST' further positions its unique role.

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 provides clear when-to-use guidance: 'Use when you need to browse, search, look up, or discover what tools exist' and 'Call this FIRST when you have many tools available and want to see the option set.' It stops short of naming alternatives or explicit when-not-to-use scenarios, so it misses the top score.

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