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

No annotations are provided, so the description carries the burden. It discloses what the tool returns (a list of specific market insights, links, and markdown) and how the date parameter behaves. It doesn't cover error handling or edge cases, but for a read-only retrieval tool, this is adequate disclosure beyond the schema.

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 sentences, front-loaded with purpose and contents, followed by parameter guidance. Every sentence earns its place with no redundancy or fluff.

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 tool with one optional parameter and an output schema, the description covers the main behaviors: what to expect in the output and how to select the date. The listed content items plus the date semantics make it complete for selection and invocation.

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 provides only a string type and default with zero description coverage. The description compensates fully by specifying the exact format (YYYY-MM-DD), optionality, and default behavior (omit for today/next matchday). This adds all necessary meaning for the single parameter.

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 uses a specific verb 'Get' and a clear resource: the daily World Cup 2026 matchday market slate. It enumerates the included contents (closest match, favorite, draw-risk, tournament context, SVG URL, etc.), which clearly distinguishes it from sibling tools like get_world_cup_brief or get_world_cup_odds.

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 provides clear usage context: the optional `date` parameter uses YYYY-MM-DD and omitting it returns today's slate or the next available matchday. While it doesn't explicitly name alternative tools, the description makes the use case (daily matchday slate) distinct from siblings, so usage is clear but lacks explicit exclusions.

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