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

No annotations are provided, so the description carries the behavioral burden. It adds useful session context with 'Opens a separate editor cabin for this session,' but it does not disclose persistence, side effects on the original file, or return behavior beyond opening.

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 front-loaded and readable, and the default/alternative guidance is efficient. However, the long enumeration largely duplicates the slug enum from the schema. It is useful, but it repeats structured data that already exists in the input 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?

For a single-parameter demo-open tool with no output schema, the description covers which files are available, the default behavior, the alternative for custom files, and session isolation. It does not discuss error cases or success output, but nothing essential is missing for selecting and invoking 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 has 0% description coverage, but the description compensates strongly by listing the exact accepted names and grouping them into documents and workbooks. It also adds the default value, footnotes, which is information the schema itself does not provide.

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 specific action ('Open one of the demo files by name') and enumerates the available demo documents and workbooks. It also distinguishes itself from document_open_file by explicitly routing custom files to that sibling.

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?

It clearly says when to use this tool (for named demo files) and when not to (for your own file), naming the alternative document_open_file. The default footnotes value further clarifies behavior when no slug is chosen.

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