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

Annotations already declare write (readOnlyHint=false), idempotent, and non-destructive behavior, so the bar is lower. The description still adds real value beyond them: where the name surfaces (web console, member lists, future authorization screens) and the 24-character limit, which the annotations do not convey.

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?

Front-loaded with the core action and limits. The final clause ('there is no argument for choosing someone else, so it cannot rename another member') partly repeats the preceding sentence, a minor redundancy, but overall it is tight and well ordered.

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, non-destructive, idempotent setter with no output schema, the description covers scope, limits, and where the change is visible. Nothing essential is missing, though the maxLength inconsistency between schema and description should be resolved.

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 coverage is 100% and the single parameter is fully documented, so the baseline is 3. The description restates the 24-character constraint but adds nothing about format or validation beyond the schema; note also that the schema's maxLength (64) conflicts with the 24-character limit asserted in both the schema description and the tool description.

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 and resource ('change the display name') and immediately scopes it to the authorizing user, which cleanly separates it from siblings like set_member_role, rename_proposal, and set_workspace_profile. An agent can identify the target object without opening the schema.

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?

Makes the usage condition explicit ('always changes your own name... cannot rename another member'), which implicitly rules out the member-management and rename siblings. It does not name those alternatives directly or state prerequisites, but the self-only constraint is a strong routing signal.

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