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

Annotations only cover readOnlyHint and openWorldHint, and the description adds substantial operational context beyond that: history is written at persist time so edits seconds old may not appear, history may be switched off or cleared so absence of entries does not mean absence of changes, and only attribute/set-membership changes are recorded. These are exactly the caveats an agent needs to interpret empty results correctly.

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 front-loaded with the return payload, then parameters, then caveats, and every sentence carries information. It is somewhat long and occasionally packed, but there is no redundant or marketing filler to strip.

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?

With no output schema, the description takes on the burden of describing return content in detail (versions, membership changes, last attributes, parents/children) and covers the failure modes (history disabled, persist lag). For a read-only five-parameter tool this is complete enough to call correctly and interpret results safely.

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 baseline is 3, but the description clarifies asAt semantics beyond the schema text by explaining that a bare date means 'the end of that day' and giving concrete format examples. It does not add anything for business or maxMembers, but those are already fully documented in the schema.

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 names a specific resource (one name) and enumerates exactly what the tool returns: attribute-version history, membership-set changes, and last attributes/parents/children if deleted. It distinguishes itself from adjacent tools by explicitly scoping to attributes and membership and naming audit_cell for values, list_deleted_names for id lookup, and history_settings for configuration.

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 states when the tool applies ('works for deleted names too'), routes the agent to list_deleted_names for finding ids of deleted names, and points to audit_cell for value-level history and history_settings for whether history exists at all. Both the alternative and the condition selecting it are given, leaving nothing to inference.

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