market_volume

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

No annotations are present, so the description carries the disclosure burden, and it does so thoroughly: it states wire values/units are preserved, no auto-fetching of continuation pages, 100-row/256 KiB array limits, truncation reported in text and metadata, and refusal of oversized records. This is substantial behavioral context beyond a simple read label.

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?

Most sentences carry useful operational detail and the purpose is front-loaded. The 'Required inputs' and 'Other declared filters' sentences are vague and could be removed or clarified, so it is not perfectly concise.

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 zero-parameter read endpoint, the description covers the important operational semantics: scope, non-player-history nature, no-continuation behavior, local limits, truncation reporting, and oversized-record refusal. The response shape is not described, but the aggregate resource and limits give enough context for an agent to invoke and interpret results.

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 has zero parameters and the schema already fully expresses this (additionalProperties false), so the baseline is 4. The description adds no parameter-level detail; the references to 'required inputs' and 'declared filters' are vague and not anchored to schema properties, so they neither add nor subtract from schema coverage.

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?

States a specific action ('Read') on a defined resource ('upstream market transaction, USD volume and current rental aggregate figures') and explicitly notes it is not an individual player's history, which differentiates it from player-history siblings. The wording 'upstream market transaction' is slightly opaque, but the aggregate scope is clear.

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 implies use when aggregate market volume/rental figures are needed and explicitly excludes individual player history. It does not name an alternative tool for player history or list when to choose a different market endpoint, so guidance is only partial.

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