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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so safety is covered. The description adds genuinely new context: the automatic payment-goal proposal triggered by listing, and the fact that the call is free. It omits auth/workspace scoping and pagination, so it is not a 5.

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?

Three short, front-loaded sentences with no padding: what it lists first, then the side effect, then the cost. The clipped 'Free.' fragment is terse but carries information, so nothing needs removing.

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 simple read-only list with one optional parameter and no output schema, the description covers what is returned and the notable side effect. However, it leaves siteId semantics and the behaviour when siteId is omitted entirely unaddressed, which is a real gap for an optional-parameter tool.

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?

SiteId is the single parameter and it is never mentioned in the description, while schema description coverage is 0%. The description therefore does not compensate for the undocumented parameter; nothing tells the agent what siteId is, whether it is required, or what a missing value defaults to.

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 names the resource and scope precisely: the site's goals (SOFT or HARD) and funnels. An agent can tell what this returns without opening the schema. It does not differentiate itself from the sibling goals_save or funnel_check, so it stops 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?

There is no statement of when to call this versus alternatives, no prerequisites, and no exclusions. The only adjacent guidance is a side-effect note ('a payment goal is proposed automatically') and a cost note ('Free.'), neither of which tells the agent when this tool is the right choice.

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