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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered without the description. The description adds the dependency chain (obtain workspace_key via create_workspace) and the month-scoping behavior, but says nothing about return shape, sorting, or what 'why' actually surfaces. That is adequate-but-thin given the annotation coverage.

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 compact sentences with no filler, and the blocking prerequisite is placed first so an agent sees it before anything else. The parenthetical packaging is slightly awkward but nothing is wasted.

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 read-only, two-parameter query with no output schema, the description leaves the return value entirely unspecified — an agent cannot tell whether 'why' means a reason field, a note, or a failure code. The prerequisite and scope are covered, but the missing output expectation is a real 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?

Schema coverage is 100%, and the schema itself documents both parameters including the 'YYYY-MM (default this month)' format for month. The description only restates the workspace_key prerequisite, adding no new meaning about the month parameter or its defaulting behavior. Baseline 3 applies when the schema carries the load.

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 phrase 'Who has not paid this month's dues, and why' clearly identifies the resource (unpaid dues for the current month) and implies the result includes a reason. It is phrased as a question rather than a verb+resource, and it names no sibling to differentiate from, so it falls short of a 5.

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 only contextual guidance is the parenthetical prerequisite that a workspace_key from create_workspace is required. There is no statement of when to reach for this tool versus list_agents or today, and no exclusions or alternatives are offered.

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