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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint=false, so the safety profile is covered. The description adds genuinely non-obvious semantics — that the returned data is versioned audit records rather than the persona's memory or identity proof — which prevents an agent from misinterpreting the payload. It omits pagination, ordering, and behavior when access is denied.

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, front-loaded with the resource and scope, with zero filler. The second sentence is terse to the point of being slightly cryptic, but every clause carries information.

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 two-parameter read-only tool with no output schema, the description should convey something about the shape of the returned history (entry structure, ordering, whether it is paginated). It asserts the data is 'records' but never says what a record contains or how the history is ordered, so the agent must probe to find out.

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 50%: account_token is fully described in the schema, while persona_id has no schema description. The description only indirectly constrains persona_id (must be a persona you own or that was shared with you) and says nothing about format, length limits, or the account_token header behavior, leaving the gaps for the agent to infer.

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 the specific resource retrieved — the versioned history of a persona — and scopes it to personas the caller owns or has shared access to, which separates it from siblings like get_project_history and get_proposal_history. It lacks an explicit verb ("Get"/"List"), but the resource and scope are unambiguous.

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?

Usage is only implied: the ownership/sharing clause hints at a precondition (you can only fetch history for personas you own or that were shared with you), but there is no explicit when-to-use vs. when-not guidance and no named alternative such as get_project_history or update_persona for different needs.

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