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

No annotations are supplied, so the description carries the full burden. It implies a read, but says nothing about whether the value is live or historical, how frequently it updates, whether access is metered, or what the response contains for a zero-parameter tool.

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?

A single sentence with the resource front-loaded and the acronym expansion kept tight in parentheses. Nothing is wasted and nothing important is buried.

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 parameters and no output schema, the description should say what an agent gets back from an index query (a spot value, a series, units). It defines the unit but not the shape or freshness of the result, leaving a real gap for a zero-arg tool.

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?

The tool takes zero parameters, so the baseline is 4 and nothing is required of the description here. The parenthetical defining HEH adds useful semantic framing even though it is not parameter-related.

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 names a specific verb ('Query') and a specific resource ('GEX-GCI general compute futures index'), and decodes the domain unit (HEH = H100-equivalent hour), which lets an agent understand the subject matter without prior knowledge. It does not, however, distinguish this index-reading tool from adjacent siblings such as futures_mandate or exchange_book.

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?

There is no statement of when to call this versus the sibling futures or exchange tools, no prerequisites, and no exclusions. The agent must infer that this is the read-only index lookup among a family of futures operations.

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