What the market just did

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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds meaningful behavior beyond that: exchange-wide scope, recency, newest-first ordering, and that these are real option trades rather than quotes.

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?

Two short sentences with no filler. The core scope and ordering are front-loaded, and the second sentence adds a practical usage cue.

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?

The tool is a simple read-only list operation with two optional parameters and an output schema. The description conveys the essential selection criteria, ordering, and use case. Nothing critical for invoking it correctly is missing.

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 only 50%: currency has a description, but limit has only type/min/max with no semantics. The description repeats the exchange-wide scope but does not explain limit or clarify how currency interacts with the ordering. Since coverage is low, the description should have compensated.

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 ('get'), a specific resource ('most recent option trades on the whole exchange'), and the ordering ('newest first'). This clearly distinguishes it from siblings like get_ticker, get_option_chain, and price_structure.

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 gives a clear use case: use it to see what other people are actually putting money on before proposing something. It does not explicitly name exclusions or alternatives, but the context is clear enough among the sibling tools.

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