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

Annotations already declare non-read-only, idempotent, non-destructive, so the safety profile is covered. The description adds genuinely non-structured context: where the new name surfaces (web console, invitation pages, home and folder pages), the 40-character ceiling, that links/pages/members are untouched, and the owner-only permission requirement. It stops short of describing the response or failure modes beyond permission.

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 the character limit, then progressively narrowing with the ★ and ⚠️ markers. All sentences carry real content, though the marker formatting is slightly heavier than needed for a single-parameter tool.

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?

With one required parameter, full schema coverage, annotations present and no output schema, the description supplies everything an agent needs: what changes, what doesn't, size limit, visibility surfaces, and the authorization requirement. Nothing material is missing.

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%, so the baseline is 3; the description still adds value by giving an example of the intended content ('replace the generated "xxx's workspace" with a company or brand name') and restating the 40-character limit that conflicts with the schema's maxLength of 128. It doesn't resolve that schema/description length discrepancy explicitly.

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 this workspace's display name') and immediately scopes it to the display name only, explicitly excluding the URL slug and the WeChat company name. An agent can distinguish it from set_workspace_slug and set_workspace_profile without opening any 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?

Names the two alternative tools and the exact condition that selects each: set_workspace_slug for the <workspace> subdomain, set_workspace_profile's company_name for WeChat share cards. It also states the prerequisite ('Workspace owner only'), so the agent knows when the call will fail.

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