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

Annotations already cover the full safety profile (readOnly, idempotent, non-destructive, closed-world), so the description earns credit for adding substantive semantics: null 'room' meaning insufficient history, enumerable status values, minor-unit encoding, and date/month formats. It stops short of any auth, permission, or rate-limit context, so it is not exhaustive.

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?

It is a single dense sentence with essentially no wasted clauses — units, date formats, statuses, and the null case all carry information. Front-loaded with the purpose, but the deeply nested parentheticals make it harder to parse than a structured list would be.

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?

With no output schema, the description carries the return contract and does so thoroughly (room, saved, target, monthly need, amount, done date, status, suggested cuts). The one soft spot is the suggested spending cuts, whose structure is only gestured at ('cuts that would make it'), leaving an agent to infer its shape.

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 baseline is 4. The description instead invests its detail in return-value semantics (units, date formats, statuses), which is appropriate for a parameterless list call.

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 opens with 'The family's goals in priority order with their plans,' which clearly identifies the resource and scope (all goals, ordered, with plans). However, it never names or distinguishes itself from the sibling get_goal_plan, and it is phrased as a return-value spec rather than an explicit 'list X' statement, so an agent gets the purpose but not the sibling routing.

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 exclusions, and no mention of alternatives such as get_goal_plan (single goal detail) or apply_goal_cuts (acting on the suggested cuts). Usage is only implied by the read-only listing content.

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