phone_update_user_call_handling_setting

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

No annotations are provided, so the description carries the full behavioral disclosure burden. It does flag 'WRITE OPERATION' and 'modifies live call routing configuration,' which conveys this is a side-effecting, production-impacting call. However, it doesn't disclose details like whether changes are reversible, authorization requirements, or what happens to existing settings not in the payload.

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 is one tight sentence plus a brief WRITE OPERATION warning. Every element serves a purpose: what it does, the three valid hour types, and the side-effect warning. Slightly stronger than a bare minimal description but not wasteful.

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?

The tool has 3 parameters with 100% schema coverage and a nested 'settings' object with additionalProperties: {} (open schema). No output schema and no annotations. The description covers the purpose and side-effect profile but doesn't compensate for the lack of annotations around mutation safety, rollback, or the open-ended settings structure. Adequate but leaves the agent without guidance on validation or failure modes.

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 schema already documents all three parameters (userId, hourType, settings) with descriptions. The description restates the hourType enum values but adds marginal value by framing the 'settings' as 'a payload matching the Zoom Phone API schema.' It doesn't introduce meaning beyond the schema; the baseline of 3 is appropriate since the schema already does the heavy lifting.

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 uses a specific verb+resource structure: 'Update a user's call handling setting for a specific hour type.' It clearly identifies the target resource (user's call handling setting) and the three valid hour types. It distinguishes from sibling tools by specifying 'user' (vs auto_receptionist) and 'update' (vs get). However, it doesn't explicitly name the sibling alternative, and 'WRITE OPERATION' is the kind of mutation signal that might normally come from annotations.

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?

The description notes the three hour-type values explicitly and states this modifies live call routing configuration, giving a sense of when it's appropriate. However, it doesn't provide explicit when-to-use or when-not-to-use guidance relative to the sibling getter (phone_get_user_call_handling_settings) or the auto_receptionist update. No exclusions or alternatives are named.

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