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

Goes well past the readOnlyHint/openWorldHint annotations: it discloses that a URL is returned rather than the file, that an Area Pass is required per area, and that the call still succeeds without a pass with a `locked` field signalling cost. That is precisely the auth/paywall behavior an agent needs before deciding whether to call.

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?

Front-loaded with the resource and return type, then usage and prerequisites in order of decision importance. Dense but nearly every clause carries information; the parenthetical field list and the pass/cost sentence are both load-bearing, though the text is packed tightly enough to be slightly effortful.

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?

There is no output schema, and the description still explains the response shape (a URL plus a `locked` field) and the failure/degraded mode. Combined with the routing guidance and the per-area restriction, an agent has everything needed to call it and interpret the result.

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%, so the baseline is 3, but the description adds a real constraint on `place` that the schema only implies through its example: reports resolve per postal area, never per municipality. Year and language are left entirely to the schema, keeping this short of a 5.

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 exactly what comes back — 'the download link for one postal area's printable PDF report' — with the resource (PDF report) and scope (one postal area) named. It explicitly contrasts itself with get_place_stats ('the report renders the same data the other tools return'), so an agent can separate the two without inspecting schemas.

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?

Gives an explicit routing rule: 'offer the link when someone wants the document, and answer questions from get_place_stats instead.' It also rules out an invalid use case up front — 'Reports exist per postal area only, not per municipality' — which prevents a likely mis-call.

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