Create new subuser

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

Annotations already disclose the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false, openWorldHint=true), so the description only needs to add context. Beyond restating the HTTP endpoint (POST /users), it says nothing about required permissions, side effects such as DID assignment, or what happens when provisioning fields like phone_mac are supplied.

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?

It is short and front-loaded, which is good, but at this length the brevity is under-specification rather than economy. The endpoint notation adds little to a reader who already has the tool name.

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 10-parameter mutation tool with no output schema, the description omits what a created subuser looks like in the response, which fields are required or mutually exclusive, and any input constraints. Given the complexity of the schema, this is materially incomplete.

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 nominally 100%, so baseline is 3, but the schema text is pure boilerplate ("Body field did.") that conveys no meaning. The description makes no attempt to explain the 10 parameters, so the agent gets no real semantic guidance for fields like did, assign_did, callerid, or sip_user_type.

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 states a specific verb and resource ("Create new subuser"), so the basic operation is inferable. However, it does not distinguish this from sibling creation tools such as placetel_create_sip_user or placetel_create_webex_user, and the term "subuser" is left unexplained relative to the plain "users" resource in the endpoint.

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 guidance on when to use this tool versus the many other creation tools (sip_user, webex_user, contact, group). No prerequisites, no exclusions, and no indication of what account or role context is needed to create a subuser.

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