stats

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

The description indicates a read-only operation with no side effects, aligning with the lack of annotations. While no additional behavioral traits are disclosed, nothing is hidden; the tool is straightforward.

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 a single concise sentence that includes all necessary information without extraneous words. It is front-loaded with the verb 'Show' and key object.

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 no parameters, no annotations, and an existing output schema, the description is sufficiently complete. It explains what the tool returns without needing to document return values.

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?

There are no parameters, so the description correctly avoids parameter details. The baseline for zero parameters is 4, and the description adds no confusion.

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 clearly states the tool's purpose: showing PDF search index statistics with specific metrics (file count, page count, DB size, renderer). It effectively distinguishes from sibling tools like read_page and search.

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 purpose is clear and the sibling context implies when to use (for aggregate stats vs. individual pages). However, no explicit guidance on when not to use or alternatives is provided.

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