save_workbook_as

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

With no annotations provided, the description fully discloses key behaviors: it refuses to overwrite unless overwrite=True, it returns the resolved absolute path, and it does not implicitly call Workbook.Save(). These details are critical for the agent to understand the tool's side effects and safety profile.

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 extremely concise, containing only three sentences. It starts with the core purpose, then clarifies the distinction from Ctrl+S, provides usage guidance, and details overwrite behavior and return value. Every sentence adds value without redundancy.

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?

For a save operation with an output schema, the description covers all essential aspects: target path, overwrite condition, and return value. It does not need to explain return values if the output schema does that. The description is complete for an agent to correctly invoke the tool.

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 input schema covers only 33% of parameters with descriptions (only 'path' has a description). The description adds significant value for 'overwrite' (explaining default false and refusal behavior) and reinforces 'path' constraints (must end with .xlsx, .xlsm, .xlsb, or .xls). However, the 'workbook' parameter lacks additional semantics beyond the name, but overall the description compensates well for the schema 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 clearly states the action: 'Save the workbook to a specific path on disk.' It distinguishes itself from the user's Ctrl+S by noting that the MCP server never calls Workbook.Save() implicitly. The verb 'save' and resource 'workbook' are specific, and the description effectively differentiates from potential sibling tools like open_workbook or close_workbook.

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 explicitly instructs when to use this tool: 'Use only when the caller explicitly named a target file.' It also notes the overwrite behavior: 'Refuses to overwrite an existing file unless overwrite=True.' This provides clear context, though it does not explicitly mention alternatives among siblings. The guidance is still strong and practical.

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