cat_segments

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

No annotations are provided, so the description carries full burden. It mentions the tool '返回每个分片的段数量、大小、文档数等' (returns segment count, size, document count per shard, etc.), which gives some behavioral context about what information is returned. However, it doesn't disclose important traits like whether this is a read-only operation (likely, but not stated), performance characteristics, authentication needs, or rate limits. The description provides basic output information but misses key behavioral details.

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?

The description is reasonably concise with three lines, but the structure could be improved. The first line '获取段信息' is the core purpose, followed by a parameters section and return information. However, the formatting with extra whitespace and separate Chinese/English sections creates minor clutter. Every sentence earns its place, but the presentation isn't optimally 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?

Given the complexity (a monitoring/diagnostic tool in a rich Elasticsearch-like ecosystem), no annotations, no output schema, and 0% schema coverage, the description is incomplete. It mentions what information is returned but doesn't explain the format, how to interpret the data, or relationships to other cat_* tools. For a tool that likely returns structured segment metadata, more context about the output and usage scenarios would be helpful.

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 0%, so the description must compensate. It mentions 'index: 索引名称（可选）' (index: index name, optional), which adds semantic meaning beyond the schema's bare 'Index' title. However, it doesn't explain what happens when the index parameter is omitted (does it return segments for all indices?), nor does it provide format examples or constraints. The description adds some value but doesn't fully compensate for the 0% schema coverage.

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 '获取段信息' (get segment information) which provides a basic verb+resource, but it's vague about what '段信息' (segment information) specifically entails. It doesn't distinguish this tool from sibling tools like 'index_segments' or 'cat_shards' that might provide related information. The purpose is understandable but lacks specificity.

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?

No guidance is provided about when to use this tool versus alternatives. With many sibling tools in the Elasticsearch/OpenSearch domain (like cat_shards, cat_indices, index_segments), the description offers no context about when this specific segment information tool is appropriate versus other monitoring or diagnostic tools.

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