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

Annotations already declare readOnlyHint=true, openWorldHint=false and destructiveHint=false, so the safety profile is covered. The description nevertheless adds real context by specifying what is read ('saved account configuration and market observations') and explicitly ruling out create/update/delete, which is more than the annotations alone convey.

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?

Three lean sentences, front-loaded with what is listed and followed by the read-only guarantee and the id hand-off. The enumerated field list is slightly redundant given an output schema exists, but nothing is padded or 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?

For a low-risk read tool with annotations covering safety and an output schema covering return shape, the description is nearly complete. The remaining gap is operational detail such as pagination, ordering, or behavior when the account has no saved markets.

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%, with detailed per-parameter text for to, from and period including defaults and precedence rules, so the schema carries the parameter burden. The description only vaguely alludes to 'the requested period' and adds no syntax or precedence detail beyond the schema, which is the correct baseline of 3.

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 verb and resource ('List markets saved by the authenticated account') plus the scope of what is returned, so the agent knows exactly what this produces. It also implicitly distinguishes itself from the singular sibling get_market by noting the returned ids feed into it.

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?

Usage is clear: call this to enumerate saved markets for a reporting window, and the note that returned ids work with get_market routes the agent to the follow-up call. There is no explicit statement of when not to use it (e.g., versus get_landscape or get_performance for aggregated metrics), so it stops short of a 5.

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