Save Workbook

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

Annotations contain only a title, so the description carries the burden. It discloses that the operation overwrites in place ('equivalent to pressing Ctrl+S') and returns a 'JSON confirmation'. However, it does not explicitly state that this is a write operation or mention failure modes, permissions, or consequences of overwriting.

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 compact with an opening sentence that immediately states the core action, followed by a clearly formatted Args section and Returns section. Every sentence adds value, with no repetition or unnecessary detail.

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 low-complexity tool with one optional parameter and no output schema, the description covers the action, parameter semantics, and return value. The main missing piece is explicit error-handling details (e.g., what happens if the workbook is not found), but this is not essential for 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 schema provides no description for the 'workbook' parameter, but the description fully explains its meaning ('Workbook name or path') and the default behavior ('None = the active workbook of the first Excel instance found'). This completely compensates for the 0% schema coverage.

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 states a clear action ('Save') and resource ('an open workbook') with explicit scope ('in place') and a relatable analogy ('equivalent to pressing Ctrl+S'). This uniquely distinguishes it from all sibling tools, none of which perform a save operation.

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 provides clear context for when to use the tool: saving an open workbook, with a default behavior for the active workbook of the first Excel instance. It doesn't mention alternatives since no sibling performs saving, so exclusions are unnecessary. The note about the active workbook gives practical usage guidance.

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