excel_write_range

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

With no annotations, the description must carry full behavioral transparency. It only states 'Changes appear immediately in Excel.' It does not disclose destructive behavior (overwriting), error conditions (invalid range, missing workbook), or data type handling. This is insufficient for safe agent use.

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 efficient with two sentences. The first sentence states purpose, the second adds a key behavioral note. No extraneous content, but could be more informative without harming conciseness.

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 (writing to Excel), the description is somewhat sparse. It lacks context on error states, data type expectations, and limits. However, it provides a clear core purpose and immediate effect, meeting minimum viability.

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?

All parameters are described in the schema (100% coverage). The tool description does not add additional meaning beyond '2D array of data to a range'. No examples or constraints are provided. Baseline 3 is appropriate.

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 action ('Write a 2D array of data') and the resource ('to a range in an open workbook'), with a behavioral note. It distinguishes from siblings like excel_read_range and excel_write_cell.

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 explicit guidance on when to use this tool versus alternatives. The description does not mention prerequisites, limitations, or when-not scenarios. For instance, it doesn't clarify that the workbook must already be open or when to use excel_write_cell instead.

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