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

Annotations already establish readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered without the description. The description adds only the useful detail that results are filtered to what the user may access (permission scoping), with no mention of ordering, pagination, or result shape.

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?

A single short sentence with no filler, and the scoping qualifier is placed at the end where it reads naturally. It is efficient, though arguably terse to the point of under-specification rather than maximally informative.

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 parameterless read-only list tool whose annotations cover safety, the description is minimally sufficient. However, with no output schema it never says what a client record looks like or how this list relates to list_accounts and client_overview, leaving a real gap about the return content and tool selection.

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?

The tool takes zero parameters, so the schema description baseline of 4 applies. There are no arguments whose semantics the description would need to supplement.

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 resource (the agency's clients) and hints at scope ("available to the user"), so an agent can infer it is a listing of clients. But it is a bare noun phrase with no verb and no differentiation from close siblings such as client_overview, list_accounts, or list_campaigns, so it does not fully stand apart from its alternatives.

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?

There is no when-to-use guidance, no prerequisites, and no reference to the obvious alternative client_overview for per-client detail. The only implicit signal is the phrase "available to the user," which is a scope hint rather than usage direction.

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