cat_count

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

No annotations are provided, so the description carries full burden. It only states '获取文档计数' (get document count), which implies a read-only operation but doesn't disclose behavioral traits like whether it's safe, if it requires specific permissions, rate limits, or what the output format might be. For a tool with no annotations, this is insufficient to inform an agent adequately.

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 concise with two lines: a purpose statement and a parameter note. It's front-loaded with the main function, and there's no wasted text. However, the structure could be slightly improved by integrating the parameter note more seamlessly, but it remains efficient.

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 tool's complexity (simple read operation with one optional parameter), no annotations, and no output schema, the description is incomplete. It doesn't explain what 'document count' entails, how the index parameter affects results, or what the return value looks like. For a tool in a server with many siblings, more context is needed to ensure correct usage.

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 description adds minimal parameter semantics: it notes that 'index' is optional and provides a Chinese label '索引名称' (index name). With schema description coverage at 0%, this adds some value beyond the schema, but it doesn't explain the parameter's purpose (e.g., which index to count documents in, default behavior if omitted). The baseline is 3 due to the single parameter, but the description only partially compensates for the low 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 '获取文档计数' (get document count), which provides a basic verb+resource purpose. However, it's vague about what 'document count' means in this context (e.g., total documents in an index, specific filtered count) and doesn't distinguish from sibling tools like 'count' or 'cat_indices' that might serve similar functions. 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?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention sibling tools like 'count' or other 'cat_' tools that might be related, nor does it specify prerequisites or contexts for usage. The parameter note is minimal and doesn't help with decision-making.

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