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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered by structured data. The description adds one genuinely non-obvious behavioral fact — a VIP entitlement gate — which is real value. It does not say whether the aggregate is precomputed/stale ("existing") or how an empty pathway is handled.

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, no filler, and the access prerequisite is stated up front at the end of the first clause set. The compression is slightly counterproductive — "closed-EOI lodged-month and score profile" packs several undefined terms into one phrase — 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 tool with four required, entirely undocumented parameters and no output schema, the description is thin: the meaning of "pathway," the shape of the returned aggregate, and the semantics of the time window are all unstated. An agent would have to guess the parameter vocabulary before it could make a valid call.

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 description coverage is 0%, so the description carries the full burden for four required parameters. It only clarifies that 'month' means lodgement month and that the parameters jointly identify a pathway; it says nothing about the occupation format (6-digit ANZSCO), the state code vocabulary, or valid visa values, leaving the agent to infer the patterns.

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?

It names a specific verb and resource ("Return ... aggregate closed-EOI lodged-month and score profile"), which is more than a restatement of the title. However, the load-bearing notion of "one exact pathway" is never mapped onto the four parameters, and the description does not distinguish this from near-siblings such as get_pathway_overview or get_score_distribution.

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 guidance is the prerequisite "VIP required." There is no statement of when to call this rather than get_pathway_overview, get_eoi_history, or get_score_distribution, all of which sit adjacent in the sibling list and could plausibly serve a similar question.

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