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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is fully covered and the description carries a lower burden. The description adds a small amount of useful context ("Includes a goals card"), hinting at a presentational element in the response, but says nothing about freshness, empty-state behavior, or whether goals are user-scoped.

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 short sentences, front-loaded with the core read action, with no filler. The trailing fragment "Includes a goals card" is slightly ambiguous about what a 'card' is, but it is efficient rather than verbose.

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 zero-parameter, read-only tool with no output schema and full annotation coverage, the description gives enough to call it correctly: what it reads, what the values represent, and that a card accompanies the result. Only the empty-state and scoping behavior are left unstated, which is a minor gap at this complexity level.

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 requires no explanation and the baseline of 4 applies. The description correctly does not waste words on parameter details it does not need.

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 ("Read goals set in P.R.O.") plus what the payload contains ("targets and current progress"), which is far clearer than the bare name. It does not, however, distinguish itself from siblings like get_plan_proposal or get_week_summary, which also surface goal-adjacent data.

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 at all — nothing tells the agent whether to call this versus get_training_plan or get_week_summary when a user asks about progress. The only signal is the implicit 'goals' framing, which is not enough to route reliably among 15 siblings.

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