open_group

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

Annotations mark readOnlyHint=false and destructiveHint=true; the description adds that the operation is temporary and reversible by closing, which is meaningful context beyond the annotation flags. It does not disclose other side effects, but the core state change and restoration path are covered.

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?

Both language versions state the behavior in a single compact sentence, front-loading the operation and giving the restore mechanism with no filler.

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 one-parameter, no-output-schema tool, the description plus annotations cover what the operation does, why it is used, and how the group is restored. No additional context is required for an agent to invoke it correctly.

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 objects parameter is already fully documented as 'groups to open; omit for selection.' The description adds no parameter-level detail, so the baseline score applies.

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 pairing, 'open a group,' and clarifies it means temporarily ungrouping members so they can be edited. The 'close to restore' clause distinguishes it from permanent ungrouping and from the sibling close_group/ungroup_objects tools without ambiguity.

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?

It explicitly gives the use case: temporarily ungroup for editing members, with 'close to restore' as the follow-up action. It does not explicitly name alternatives such as ungroup_objects or state when not to use it, though the 'temporary' wording implies the distinction.

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