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

The description reveals that the URL is time-limited, adding behavioral context beyond the readOnlyHint annotation. It correctly implies a read-only operation (returning a URL) and is consistent with the idempotent and open-world hints. No contradictions.

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 two concise sentences, front-loading the core purpose and then providing essential operational steps. No redundant or filler content.

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?

Given the presence of an output schema and the simple nature of the tool (return a URL), the description covers all necessary operational context: the prerequisite call, the key parameter override, and the result type. It is complete for an agent to use correctly.

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 schema fully describes all parameters, and the description adds meaningful usage semantics for 'slug' (from list_market_data) and 'md_type' (overrides prefix for bbo). It enhances understanding without conflicting with the schema.

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 returns a time-limited URL for a single orderbook file, and the directive to use list_market_data first distinguishes it from other file-getter siblings like get_trades_file or get_surface_file. The verb 'Return' is specific and unambiguous.

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 explicitly instructs to call list_market_data first to obtain the exact slug, and provides a conditional hint for md_type ('Set md_type to `bbo` for best-bid/offer files'). This gives clear when-to-use and how-to-use guidance.

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