index_client

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

With no annotations, the description carries the disclosure burden. It usefully states that results come 'from the CSV index only' and that output includes 'sample rows,' implying the tool does not return all data. However, it does not mention error behavior, return envelope, or performance characteristics.

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 phrase with no filler; every word contributes. It is not a full sentence and packs little organizational structure, so it misses a top score, but it is appropriately sized for a simple tool.

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?

The tool has 3 parameters, zero schema descriptions, and no annotations, yet the description is one line. It omits parameter semantics and alternative selection guidance, leaving an agent without enough context to invoke it confidently; output schema existence does not compensate for these gaps.

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%, and the description does not explain client_id, month, or csv_path. 'One repository's' vaguely maps to client_id, but the optional parameters are completely unaddressed, so the description adds no parameter-level value.

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 names concrete outputs (DOI count, states, prefixes, sample rows) and explicitly scopes to 'One repository' and 'the CSV index only.' It lacks a verb like 'retrieves' but still clearly identifies what the tool provides and distinguishes it from list_clients or index_summary.

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 on when to choose this tool over siblings or when not to use it. The phrase 'CSV index only' hints at a data-source limitation, but there is no explicit use case, prerequisite, or alternative mentioned.

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