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

Annotations already establish the safe read-only profile, so the bar is lower, and the description still adds real behavior: admins see pending invitations, tokens are never exposed, and no workspace is created. That is meaningful disclosure beyond the structured hints.

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?

Four short sentences, front-loaded with what is returned before the admin caveat, scope note, and negative guarantees. Nothing is padded, though the final negative sentence is defensive 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?

For a zero-required-param read tool with no output schema, the description covers who is returned, the admin-only extension, the scope selector, and two negative guarantees. The only real gap is terminology alignment with the workspace_id parameter and differentiation from get_workspace_team.

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?

The single parameter has 0% schema coverage, so the description must compensate. It conveys that the ID is optional and selects another library you belong to, but it calls the field 'library ID' while the schema names it workspace_id, which is more likely to confuse than clarify.

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: reading who can access briefs and their roles, plus the admin-only visibility of pending invitations. It is clear on its own, but it never distinguishes itself from the very similar sibling get_workspace_team, and its use of 'library ID' conflicts with the tool's own workspace_id parameter.

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?

Gives implicit context (admins see more, optional library ID scopes to another library you belong to) and one negative statement ('does not create a workspace'). It never says when to prefer this over get_workspace_team or how it relates to invite_team/remove_workspace_member.

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