Update a project membership

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

Annotations already declare readOnlyHint=false, idempotentHint=true and destructiveHint=false, and the word 'Sets' is consistent with set/replace idempotent semantics. However, the description doesn't disclose that setting roles likely replaces existing role assignments, nor any permission requirements -- context that matters for a mutation tool.

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?

A single tight sentence with the resource and operation front-loaded and no filler. It is appropriately sized, though its brevity comes at the cost of the missing usage and behavior details noted elsewhere.

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 2 fully documented params, annotations covering the safety profile, and no output schema, the definition is minimally adequate. But for a role-mutation tool it omits the replace-vs-append semantics of role_ids and the required membership-id resolution step, leaving real gaps.

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%, with 'Membership id (not a user id).' and 'Role ids to set.' already in the schema. The description adds nothing beyond that baseline; it doesn't clarify whether role_ids replaces or appends to existing roles.

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?

The description names a specific verb and resource: 'Sets the roles of a project membership by its membership id.' That is clear and distinguishable from add_member/remove_member, though it never explicitly names those siblings or contrasts the membership-id vs user-id targeting it uses.

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?

There is no when-to-use guidance, no mention of prerequisites (e.g. you must first resolve a membership id via projects_list_memberships), and no routing against alternatives like projects_add_member or projects_remove_member. Usage can only be inferred from the name.

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