x_api_add_lists_member

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

With no annotations to lean on, the description carries the full burden and delivers: it discloses the mutating/high-risk nature, required OAuth scopes, environment-selection behavior, common failure conditions, and a safety warning to validate scope/payload/authorizationKey. This is commendably comprehensive and goes well beyond what annotations typically 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?

The description uses labeled sections and is front-loaded with the clear purpose. It is long but appropriate for the tool's complexity and auth requirements. The only redundancy is 'Use when: Add List member,' which adds no information, but the overall structure makes it scannable and each section earns its place.

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?

Given no annotations and no output schema, the description impressively provides expected response shape, failure conditions, permissions, and environment selection. It could dive deeper into the body payload structure, but it compensates by recommending x_schema_discovery for such details, making the tool usable for an agent.

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 schema has 0% description coverage, but the description adds some meaning via 'Parameter formats and constraints' (id, body) and environment-selection behavior (scopeTenantId, scopeUserId, scopeAccountId, credentialKey). However, it omits explanations for authorizationKey and preferredAuthType, and the body description is vague ('used for the documented request payload'), so it only partially compensates for the schema gap.

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 opens with 'Add List member,' a specific verb+resource statement that clearly distinguishes this mutation tool from siblings like x_api_get_lists_members and x_api_remove_lists_member_by_user_id. The 'Use when' repeats the name, but the core statement is unambiguous and lacks the tautology that plagues weaker definitions.

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?

Explicitly states 'Do not use when: a more specific auth/configuration tool is required before the API call or you are only exploring; prefer x_schema_discovery or x_query_suggestion first,' and lists recommended prerequisite/follow-up tools like x_connection_info and x_auth_upsert_principal_credentials. This gives clear, actionable guidance on when to use the tool versus alternatives.

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