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

With no annotations provided, the description carries full burden for behavioral disclosure. While it states what the tool does (summarize dimensions), it doesn't mention important behavioral aspects like error handling, file size limits, permission requirements, or whether it modifies the file. For a file operation tool with zero annotation coverage, this leaves significant behavioral questions unanswered.

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 perfectly structured and concise: a clear purpose statement followed by well-organized Args and Returns sections. Every sentence earns its place, with no redundant information. The formatting makes it easy to scan and understand quickly.

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 simple functionality (single parameter, clear output), the description is mostly complete. The output schema exists (Returns section specifies string output), so the description doesn't need to explain return values. However, for a file operation tool with no annotations, it could benefit from mentioning basic behavioral constraints like error conditions.

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?

With 0% schema description coverage (the schema only provides type and title), the description fully compensates by clearly explaining the single parameter's purpose, format constraints ('Name of the CSV file'), and location context ('in the /data directory'). This adds substantial meaning beyond what the bare schema provides.

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 specific action ('summarize'), the resource ('CSV file'), and the exact output ('reporting its number of rows and columns'). It distinguishes from the sibling 'summarize_parquet_file' by specifying CSV format. This is a precise verb+resource statement with sibling differentiation.

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 implies usage context through the Args section mentioning '/data directory', but doesn't explicitly state when to use this tool versus 'summarize_parquet_file' or other alternatives. It provides basic operational context but lacks explicit guidance on tool selection criteria or exclusions.

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

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

With no annotations provided, the description carries the full burden. It discloses the tool's behavior by stating it reports dimensions (rows/columns) and returns a string, but lacks details on error handling (e.g., if file doesn't exist), performance, or any side effects. It adds basic context but misses deeper behavioral traits.

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 front-loaded with the core purpose in the first sentence, followed by structured Args and Returns sections. Every sentence earns its place by providing essential information without redundancy, making it efficient and well-organized.

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 low complexity (1 parameter, no nested objects) and the presence of an output schema (which covers return values), the description is mostly complete. It explains what the tool does, the parameter's semantics, and the return type, but could improve by addressing error cases or usage vs. siblings.

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 schema description coverage is 0%, so the description must compensate. It adds meaning by specifying that 'filename' is the name of a Parquet file in the '/data directory', which clarifies the parameter's context beyond the schema's generic 'Filename' title. However, it doesn't detail format constraints (e.g., file extensions).

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 specific action ('Summarise a Parquet file') and what it reports ('number of rows and columns'), distinguishing it from the sibling tool 'summarize_csv_file' which presumably handles CSV files. The verb+resource+scope combination is precise and unambiguous.

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 implies usage through the mention of 'Parquet file' and '/data directory', suggesting it's for Parquet files in that location, but doesn't explicitly state when to use this vs. the sibling CSV tool or any alternatives. No explicit exclusions or prerequisites are provided.

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