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

The annotations already declare `destructiveHint: true`, `readOnlyHint: false`, and `openWorldHint: false`. The description adds useful context about preserving existing content and formatting, file-access permission needs, and the return shape, though it does not discuss atomicity or failure behavior.

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 with the core action, followed by permission context, return shape, and sibling routing. Every sentence adds useful information without repetition or filler.

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 the annotations, full schema coverage, and presence of an output schema, the description is complete enough for correct invocation. It covers purpose, alternatives, file-access constraints, preservation behavior, and return fields.

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?

Schema description coverage is 100%, so `path` and `content` are already documented by the schema. The description reinforces that text is appended to the file at `path`, but it does not add substantial new parameter-level semantics beyond the schema.

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 verb and resource: append text to the end of an existing Word .docx file at `path`. It also explicitly distinguishes the tool from `word_create` and `word_read`, so an agent can identify its role without opening other schemas.

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 specifies the target condition (an existing .docx document) and names the correct alternatives: `word_create` for new documents and `word_read` for reading. This leaves little ambiguity about when to choose this tool.

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