open_workbook

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

The description mentions 'create a session' but does not explain what a session entails (e.g., duration, locking, concurrency limits). No annotations are provided, so the description carries the full burden but fails to disclose key behavioral traits like mutability or error conditions.

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 concise with a clear docstring format (Args, Returns). The first sentence effectively summarizes the tool. Minor repetition of default values already in the schema.

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 no annotations and an output schema that documents return values, the description covers basics but misses important context like session management, concurrency issues, and error handling. It is adequate but not comprehensive.

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?

With 0% schema coverage, the description compensates by explaining each parameter's purpose (filepath, visible, read_only) beyond type/default. However, it lacks details like acceptable file path formats or implications of read_only on editing.

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 it opens an Excel workbook and creates a session, distinguishing it from sibling tools like create_workbook (creates new) and close_workbook (closes). The verb+resource is specific and unambiguous.

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 on when to use this tool versus alternatives such as create_workbook or read_data_from_excel. It does not mention prerequisites, file state (e.g., already open), or conditions for optimal use.

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