update_service_group

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

With no annotations, the description carries the full behavioral burden, and it does disclose one important trait: members is a wholesale replacement, not a merge. That is a genuinely useful destruction warning, but it largely restates the schema's "Complete new member list" and says nothing about permissions, reversibility, or how other fields behave.

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?

Two short sentences, the purpose front-loaded and the replacement warning immediately after. Every word earns its place with no filler or repetition.

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?

This is a mutation tool with no annotations, no output schema, a nested free-form extra object, and a vdom scoping parameter that interacts with the environment default. The description should cover permissions, side effects, and what happens to unspecified fields, but it only handles the members case.

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%, so the baseline is 3. The description's only parameter-level addition is the replacement semantics of members, which the schema already conveys; vdom, extra, and comment get no additional explanation.

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?

States a specific verb and resource ("Update a service group"), so the agent immediately knows this mutates an existing group object. It does not, however, distinguish itself from siblings like create_service_group or update_address_group, which the example rubric uses as the marker for a 5.

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 offers no when-to-use guidance, no prerequisites, and no pointer to alternatives such as create_service_group for new groups. The update verb implies the context but nothing in the text states it.

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