cigchat_subscriber_set_user_fields

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

With no annotations, the description carries the burden. It adds useful context: the required 'Manage Flow' scope, the PUT endpoint, and the 20-field cap. But it does not disclose response behavior, error handling, partial-failure semantics, or what happens if a field does not exist.

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, front-loaded sentence communicates the operation, resource, field limit, endpoint, and auth requirement without redundant filler. Every component adds value.

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 write tool with a nested array parameter, no annotations, and no output schema, the description is too thin. It lacks return-value info, failure behavior, validation rules, and relationship to sibling field-setting tools, leaving the agent under-informed for a relatively complex operation.

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 low, and the tool description does little to clarify the parameters. It mentions 'multiple user field value' and 'up to 20', but never explains `user_ns` or the expected shape of `data` items (value + var_ns). The schema's var_ns description does more work than 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?

The description clearly identifies the action ('Set or update'), target ('subscriber multiple user field value'), and capacity ('up to 20 user fields'), plus the REST endpoint. However, it does not explicitly differentiate this tool from closely related siblings like subscriber_set_user_field or subscriber_set_user_fields_by_name.

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?

No guidance is given on when to choose this tool over the many similar subscriber/field manipulation siblings. The only usage-related detail is the auth scope requirement and the 20-field limit, which is a constraint rather than a decision rule.

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