system_resource_usage_latest

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

With no annotations provided, the description carries the full burden of behavioral transparency. Calling it a 'snapshot' implies a read-only, point-in-time view, but it does not disclose whether the data covers all users or only the current user, whether administrative privileges are needed, or what the returned snapshot contains beyond being 'per-user resource usage'.

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 a single, compact sentence that front-loads the key differentiators ('latest', 'per-user', 'resource usage'). Every word earns its place and there is no redundant 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?

This is a simple zero-parameter read-style tool, and a one-line snapshot description covers the core semantics. The presence of an output schema relieves the description of explaining return values, though the ambiguity about which users are included remains a minor completeness gap.

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 input schema has zero parameters and schema description coverage is 100%, so there is no parameter semantics gap for the description to fill. The baseline for 0-parameter tools is 4, and the description does not introduce misleading parameter information.

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 'Latest per-user resource usage snapshot' clearly identifies the resource (per-user resource usage) and the temporal scope (latest), distinguishing it from history and global siblings. It lacks an explicit verb like 'Get' or 'Retrieve', but the intent is 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: 'latest' suggests immediate current data versus history tools, and 'per-user' contrasts with global usage tools. However, the description does not explicitly state when to use this tool over system_resource_usage_history, system_global_usage_latest, or users_get_usage, nor does it mention any exclusions.

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