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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and closed-world, so the safety profile is covered. The description contributes that progress is computed against the current week/month window and reports on-track status, but adds nothing about scope (user vs. workspace), inclusion rules for goals with no target, or ordering.

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?

One sentence with no filler, and the core content (target, elapsed, remaining, on-track) is front-loaded. It would be tighter with a leading verb to frame the action before enumerating fields.

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?

An output schema exists, so the return shape needn't be spelled out, and the read-only annotations cover safety. What remains missing is the default behavior for the optional period parameter and any statement of whose goals are returned, which an agent needs to call this confidently.

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 single enum parameter is documented in the schema, so baseline is 3. The description does not clarify the important unstated case: period is optional, and it never says whether omitting it returns both weekly and monthly goals or defaults to one.

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 makes clear the resource is activity goals and that the response includes target, progress to date, remaining amount, and on-track status, which distinguishes it from sibling reads like get_summary or list_activities. It never states an explicit verb ('list', 'retrieve'), reading instead as a field listing, so the action is inferred from the name rather than declared.

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 guidance on when to call this versus get_summary, get_status, or get_weekly_review, and no mention of preconditions or what happens with no goals. The phrase 'current week or month' hints at the period parameter but never says when to choose one over the other.

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