validate_excel_range

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

The readOnlyHint annotation already signals a safe read operation, which the description supports. However, the description adds minimal detail beyond that: it does not disclose what happens when the range does not exist, whether it returns a boolean or throws an error, or what constitutes 'properly formatted'. With annotations present, the bar is lower but the description still lacks useful behavioral context.

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 with no filler, earning a high score for conciseness. It is front-loaded with the verb 'Validate' and the object. However, it is so brief that it borders on under-specification, preventing a 5.

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?

With no output schema, the description should explain what the tool returns or its behavior on success/failure, but it does not. The tool has four parameters and a validation purpose, yet the description omits details about error handling, return values, or additional context needed for correct invocation. The description does not fully cover the tool's complexity.

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 provides no information about the parameters. It does not explain the expected format of start_cell/end_cell, how they define the range, or the meaning of filepath and sheet_name. This is a critical gap since the description must compensate for missing parameter documentation, but it fails to do so.

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 validates whether a range exists and is properly formatted, using the specific verb 'validate' and resource 'excel range'. It is somewhat vague about what 'properly formatted' means, but it distinguishes from sibling tools like inspect_named_range or validate_formula_syntax by focusing on range existence/format.

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 use this tool versus alternatives. The description does not mention prerequisites, use cases, or exclusions. It relies solely on the tool name and short description, leaving the agent to infer when validation is needed.

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