origin_fill_missing

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

The description indicates that the tool can operate in-place or write to a new sheet via output_book/output_sheet. However, it does not explicitly state that in-place modification is the default, nor does it describe side effects, data type handling, or error conditions. With no annotations, more detail is needed for full transparency.

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 short (two sentences) and front-loads the purpose. The list of strategies is presented clearly. It is concise but could be better structured with bullet points or sections for readability.

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?

Despite having an output schema, the description is incomplete for a tool with 7 parameters and no annotations. It does not explain the role of book_name and sheet_name, the default behavior (in-place vs new sheet), or the format of the columns parameter. Missing these details hinders correct invocation.

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 description adds meaning to three parameters: strategy lists allowed values, columns explains scope, and output_book/output_sheet indicate new sheet creation. However, book_name and sheet_name are not explained, and the value parameter is only implied for the 'value' strategy. Given 0% schema description coverage, the description partially compensates but leaves gaps.

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 starts with 'Handle missing worksheet values' which clearly indicates the tool's domain. It then enumerates strategies, making the purpose specific and distinct from siblings like filter_rows or drop_duplicates. However, 'handle' is somewhat generic, and a more precise verb like 'fill or remove' would improve clarity.

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 lacks explicit guidance on when to use this tool versus alternatives. It does not mention prerequisites, scenarios, or tool selection criteria. The strategies are listed, but no advice is given on choosing among them or comparing with similar tools like origin_drop_duplicates.

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