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

The readOnlyHint=true annotation already establishes this is a safe read, so the description only needs to add value beyond that. It does add useful context — pagination and the mapping to GET /users — but omits practical traits such as Harvest's rate limits, auth scope requirements, and what a page of results looks like. Reasonable but not rich.

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?

Three tight clauses: resource+scope first, then filtering, then pagination and the REST path. Every sentence carries information and nothing is front-loaded incorrectly.

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 simple, non-destructive read tool with a fully-documented schema and annotations covering the safety profile, the description is nearly sufficient; the only meaningful omission is any hint about the pagination response shape, which is arguably fine since no output schema exists but pagination semantics matter here.

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 page, per_page, is_active, and updated_since are already fully documented in the schema. The description only restates the filter concepts at a high level, adding no syntax, format, or defaulting detail beyond what the schema provides — the baseline 3 for a fully-covered 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?

States a specific verb and resource ('List users in the account') plus the filtering scope and the underlying REST endpoint. It is unambiguous, though it does not explicitly contrast itself with any sibling tool (there is no competing user-listing tool in the sibling set, so the risk of confusion is low).

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 implies usage through 'optionally filtered by active status or updated-since', which tells the agent when the filters apply, and notes pagination. However, there is no explicit when-to-use/when-not guidance and no reference to alternative tools (e.g., harvest_get_current_user) for cases that do not need the full list.

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