Get sector leaders/laggards

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

The annotations already declare readOnlyHint=true and openWorldHint=true, which covers safety and dynamic behavior. The description adds useful behavioral details like 'by recent return' and the requirement for a full GICS name, but it does not disclose return structure, pagination, or potential error conditions. With annotations present, this is adequate but not exceptional.

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 three sentences, each earning its place. The first sentence front-loads the core purpose, the second gives clear usage, and the third conveys the critical constraint with examples and a reference. There is no redundancy or fluff, making it 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?

The tool is simple (2 params, no output schema) and the description covers its purpose, usage, and a key constraint. It relies on the schema for parameter details and annotations for safety. However, it does not describe the return format or the exact meaning of 'recent return', which would be useful for agent invocation, but given the tool's low complexity, this is a minor gap.

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%, so the baseline is 3. The description adds extra meaning beyond the schema by explicitly stating that sector 'must be a full GICS name' and referencing another tool for valid names, which clarifies the expected format more precisely than the schema alone. The limit parameter is already well-described in the schema, so no additional explanation is needed.

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 states the tool's function: 'Top and bottom performing stocks within a GICS sector, by recent return.' It uses a specific verb ('Get') and resource ('sector performers'), and distinguishes itself from sibling tools by focusing on sector-level leaders and laggards. The title 'Get sector leaders/laggards' reinforces the purpose.

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 explicit usage context: 'Use to find what is leading or lagging inside a sector.' It also gives a prerequisite for the sector parameter (must be a full GICS name) and points to a sibling tool for valid names, which is helpful. However, it does not state when not to use this tool or list alternative tools for similar tasks, so it falls short of a full 5.

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