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

Annotations already flag destructive/non-idempotent/read-write behavior, so the bar is lower. The description adds valuable traits beyond the annotations: it sends the approved version rather than the newest one, and it requires a connected Drive. This gives an agent accurate expectations about a non-obvious version-selection behavior. No contradiction with annotations.

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?

Three sentences, each earning its place: the first states action, resource, destination, and purpose; the second clarifies the version nuance; the third states the prerequisite. No fluff or repetition of schema content.

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 tool with a safety profile covered by annotations, the description is largely complete: it names the destination, the version selected, and a hard prerequisite. The main gap is that it doesn't specify destination side effects (overwrite vs. create a new file on Drive) or return value, but with no output schema and a clear purpose these are minor omissions.

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 the baseline is 3. The single parameter item_id is already documented in the schema as 'The vault file id, from list_vault_items.' The description adds no parameter-specific details beyond the schema, though its version-selection caveat subtly clarifies what the item_id refers to.

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?

States a specific verb, resource, and destination: delivering a TomeVault file's approved version to the caller's connected Google Drive. The 'caller's connected Drive' scope and the emphasis on the approved (not necessarily newest) version clearly differentiate it from sibling tools like save_vault_version or get_vault_item.

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?

Provides clear context: this is for getting a corrected/approved file to the place the team reads it, and it notes the prerequisite of a connected Drive. It does not explicitly name alternatives or exclusion conditions, but the purpose statement makes the intended use fairly unambiguous.

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