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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds only the 'full-day' scope, saying nothing about paging behavior even though cursor/paging/direction parameters imply a paged response mode.

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?

A single tight sentence with the resource front-loaded and zero filler. It is efficient, though it is arguably too terse to carry routing information.

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?

With a full output schema and 100% parameter coverage, the description needn't explain returns or params. But for a tool with several sibling score endpoints, the absence of any routing guidance leaves the definition minimally adequate rather than complete.

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%, so the schema already documents all six parameters including formats and allowed sport tokens. The description echoes sport/date/timezone without adding syntax or constraints beyond the schema, so the baseline 3 applies.

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 names a specific resource (full-day scores and fixtures) and its scoping dimensions (sport, date, UTC offset), so the agent knows what data comes back. However, it does not differentiate itself from close siblings like livescore_live_scores or livescore_scores_toc, leaving the agent to infer the distinction.

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 word 'full-day' hints that this differs from a live feed, but there is no explicit when-to-use statement, no exclusions, and no named alternative. The agent must infer that livescore_live_scores covers in-progress action and this covers the whole day.

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