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

Annotations already cover readOnly, idempotent, and non-destructive behavior. The description adds meaningful context about return format ('full input schemas (with curated examples)'), direct callability ('ready to call directly, no second schema lookup needed'), and the recommendation to 'Call this FIRST.' This goes beyond annotation information without contradicting it.

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 structured in three sentences, front-loading the core purpose, then usage guidance, then output details. The long list of domains is slightly verbose but serves to clarify the tool's coverage. Overall, every sentence contributes value.

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?

With no output schema, the description compensates by explaining the return value ('names, descriptions, and full input schemas') and that results are directly callable. It covers purpose, usage timing, and return format, making it complete for a discovery tool. The only minor gap is not detailing behaviors like case sensitivity or error handling, but these are not critical here.

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 coverage is 100%, with all parameters and aliases documented. The description reinforces 'query' as a natural language description and 'limit' via 'top-N,' but it does not add substantive parameter meaning beyond the schema. Baseline 3 is appropriate.

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 'Find tools by describing the data or task,' clearly stating the verb and resource. It enumerates specific domains (SEC filings, FDA drugs, FRED, etc.) and distinguishes this meta-tool from sibling data-access tools by highlighting that it returns schemas ready to call.

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 explicitly states 'Use when you need to browse, search, look up, or discover what tools exist' and 'Call this FIRST when you have many tools available.' It also implies a when-not-to-use ('not just one answer'), but it does not name specific sibling tools as alternatives, so it's not a 5.

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