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

Annotations already declare readOnly, idempotent, non-destructive and openWorld, so the safety profile is covered. The description adds meaningful behavior beyond that: no Google calls, no credit consumption, and a concrete inventory of what is returned (banded scores, journey burden, factor breakdown, citations, continue link).

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 front-loaded sentences: purpose, cost/behavior constraint, then required inputs and returns. No filler, though the return-value enumeration is dense and could be trimmed.

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?

With no output schema, the description carries the return-value burden and does so explicitly, listing banded scores, journey burden, factor breakdown, citations and the continue link. Combined with 100% schema coverage for the 6 parameters, an agent has enough to call it correctly.

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 100%, so the baseline is 3. The description reiterates that placelist IDs/slugs come from list_placelists but adds no syntax, precedence, or format detail beyond what the schema already documents.

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 ('Rank the venues in ... Placelists by FairWhere Score for this group') and scopes it to a group context. It is distinguishable from siblings like list_placelists and get_meet_pair without opening a schema.

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?

Names the input source ('placelistIds and/or placelistSlugs (from list_placelists)') and clarifies the cost model ('Free estimate-only path: no Google calls, no credits'), which signals when this path is preferred. It stops short of naming an explicit alternative tool or stating when NOT to use it.

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