getBatchMarketCap

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and openWorldHint=true, so the safety profile is covered. The description adds only that multiple companies are returned in a single request; it says nothing about symbol-count limits, error behavior for invalid tickers, or response shape, which are the behavioral facts a batch caller actually needs.

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 core capability is front-loaded in the first sentence, which is good. The second sentence, however, restates the same idea in marketing language ('streamlining the analysis of company valuations') without adding operational information, so the text is padded rather than wasted entirely.

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?

This is a simple one-parameter read tool with full schema coverage and annotations that carry the safety profile, and no output schema exists to require return-value explanation. What an agent needs to call it correctly is present; only optional details such as symbol limits and return fields are absent, which is a minor gap for this 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?

Schema description coverage is 100% and the single 'symbols' parameter is documented as a comma-separated list of stock symbols. The description reinforces the multi-symbol nature ('multiple companies in a single request') but adds no format example, no maximum symbol count, and no delimiter guidance beyond what the schema already states, so the baseline of 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: 'Retrieve market capitalization data for multiple companies in a single request,' which clearly conveys a batch read of market cap. It implicitly contrasts with the single-symbol getMarketCap and getHistoricalMarketCap siblings through the word 'batch,' but never names them explicitly, leaving the differentiation to inference.

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 offers an implied use case, 'compare the market size of various companies simultaneously,' but gives no explicit when-to-use guidance, no exclusions, and no pointer to the single-symbol alternative. An agent can infer batch usage but must decide on its own when batching is preferable.

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