getFundHoldings

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

The annotations already declare readOnlyHint, idempotentHint, and openWorldHint, so the definition only needs to supplement them, and it does add the scope of asset classes covered. It says nothing about response size, pagination, partial weights, or behavior for an invalid or unsupported symbol, which for a holdings breakdown that can be long matters to an agent planning a call.

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 first sentence is front-loaded and useful. The second sentence is mostly promotional filler ('Access real-time data... providing insights into asset composition and fund strategies') and could be replaced with comparison or format information that would actually help an agent.

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 read-only, single-parameter lookup with full schema coverage and safety annotations, the definition covers what the tool returns conceptually and for which instrument types. It lacks only sibling differentiation and symbol-format detail, which are minor against this tool's low complexity.

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?

There is a single required parameter and schema description coverage is 100%, so the schema already documents 'symbol'. The description adds no format guidance, such as ticker style or accepted variants, so it neither compensates for nor degrades the schema; baseline 3 applies.

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 and resource: a breakdown of the assets held within ETFs and mutual funds. That is clear enough to act on, but it never distinguishes itself from close siblings such as getFundAssetExposure, getFundSectorWeighting, or getFundCountryAllocation, so an agent must infer how holdings differ from asset exposure.

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 no guidance on when to choose this tool over the other fund tools, nor any prerequisites, such as whether the fund must be an ETF or mutual fund rather than a stock. The second sentence gestures at value ('insights into asset composition and fund strategies') rather than usage conditions.

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