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

Annotations already declare destructive, idempotent, non-open-world, non-read-only. The description adds genuinely new behavior: three ways to identify the target folder and the not-found semantics for unknown or cross-team folders. It does not explain why the operation is flagged destructive or whether the old name is recoverable, so a small gap remains.

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 short sentences, front-loaded with the action and then the sibling exclusion and error semantics; nothing is wasted. The folder-identification sentence slightly duplicates the schema, keeping it from a perfect score.

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 simple rename tool with full schema coverage and rich annotations, the description supplies the missing pieces an agent needs: target resolution options, sibling routing, and failure behavior. Return-value detail is not needed since there is no output schema and the operation is a straightforward mutation.

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 both required parameters and the intent/llm_model fields are already documented inline. The description's mention of name/ID/short-ID lookup largely restates the folder parameter's own schema text and adds no format or resolution-order detail (e.g. precedence when a name collides with an ID).

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?

"Rename a folder" gives a specific verb and resource, and the follow-up sentence explicitly narrows the scope ("Renaming does not move any Jams") so an agent cannot confuse it with updateJam. It is clearly distinguishable from createFolder/deleteFolder/listFolders siblings.

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 explicitly routes the adjacent operation elsewhere ("use updateJam for that"), which is the main confusion risk among siblings. It does not spell out when not to call it (e.g. permissions or a folder-name conflict path), so it falls short of full when/when-not guidance.

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