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

No annotations exist, so the description bears the full burden. It implicitly reads as a simple read-only lookup and discloses the returned fields, but says nothing about permissions, rate limits, or data freshness/lag for 'latest'. Adequate but with real gaps.

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 tight bracketed segments, zero filler. The purpose and field list come first, the usage trigger second, both front-loaded.

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 zero-param, no-output-schema read tool, the description covers both what comes back and when to call it. Adding freshness/lag semantics would make it complete, but nothing essential 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?

The tool takes zero parameters, so there is nothing to mis-document; the baseline for a no-param tool applies. No parameter meaning is needed.

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 ('查询门罗币最新区块头') and enumerates the exact fields returned (height, hash, timestamp, difficulty, reward, tx count), which is more precise than the bare name. It does not name a sibling to differentiate against, so it sits at 4 rather than 5.

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 【何时用】 block explicitly names the triggering questions: latest XMR block time, latest height, and whether the chain is stuck. That is concrete when-to-use guidance, though no alternative tool is cited for overlapping needs.

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