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

Annotations already declare read-only, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds useful constraints — max 1500 compact trades, first 30 minutes after graduation, history starting October 3, 2026, and variable dataset coverage — but does not explain what 'compact' means or what the response shape is.

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?

Only three sentences and no filler, so it is concise. But the first sentence is grammatically broken and front-loads ambiguous information instead of the core action, which weakens structure.

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 no output schema, four parameters, and only 25% schema description coverage, the description should carry more weight. It omits what the tool returns, how 'mint' is interpreted, and how 'api_key' is used, leaving significant gaps for correct 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?

Schema coverage is only 25%, so the description needs to compensate. It does clarify that 'minutes' relates to the first 30 minutes after graduation and that 'day' should be sourced via days_available, but it says nothing about 'mint' or 'api_key' semantics beyond their names.

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 never clearly states the verb or resource — 'One graduate and at most 1500 compact trades' is fragmented and ambiguous about whether the tool returns trades, graduates, or both. It implies trade retrieval via the tool name and 'compact trades', but an agent cannot confidently tell what the call produces or how it differs from siblings like day_full_stats or lookup_coin.

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 gives one concrete routing hint: 'Use days_available for the exported UTC day range,' which is helpful. However, there is no explicit when-to-use vs. alternatives (e.g., day_full_stats) and no when-not guidance.

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