hosts_inventory

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

No annotations are supplied, so the description has to carry the behavioral load. It does hint that liveness is assessed (存活/不可达) and that manual-configuration state is included, which are useful traits beyond the schema. But it never says whether the liveness check is a live network probe, how expensive or slow that is, what the ordering or scope is, or whether the call is purely read-only caching.

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?

It is a single compact clause with the key information, the full inventory and its fields, front-loaded and free of filler. The downside is that this extreme terseness leaves the when-to-use context entirely absent, and the result reads more like a title than a description.

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 annotations and no output schema, the description must cover everything, and it does name the returned fields, which helps. Still missing are the scope of the inventory, whether the liveness results are fresh or cached, and its relationship to hosts_content, so an agent cannot fully predict the result.

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 no parameters, so there is nothing parameter-related for the description to explain, and it correctly stays silent. Baseline 4 applies; there is no gap to compensate for.

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 states a specific verb (取) and resource (全量子域清单), and even enumerates the fields returned (存活/不可达、标题、是否人工配置). This is much more concrete than the bare name hosts_inventory, but it never says how it differs from hosts_content, the sibling most likely to be confused with 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?

There is no explicit guidance on when to call this tool versus hosts_content, site_search, or sites_index. The usage is only implied by the word 清单 (inventory), which an agent has to infer on its own.

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