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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety and scope are covered. The description adds genuinely new behavioral context: results are deterministic and carry a methodology version stamp, and the response contains seven weighted dimensions, confidence values, reasoning, recommendations and dataset provenance. It stops short of stating latency, limits, or failure modes, which keeps it at a 4.

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 sentences, front-loaded with what the tool returns and closed with the sibling routing. The first sentence is a long enumerated list, but every item conveys real information about the response shape rather than filler.

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 compensates by enumerating the response contents and noting the stamped methodology version. Combined with geographic scope, determinism, and sibling routing, an agent has everything needed to invoke this two-parameter read-only tool 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 both 'area' and 'preset' are already fully documented, including per-enum-value explanations. The description adds no further parameter meaning (e.g. what happens with an ambiguous place name), so the baseline of 3 applies.

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 ('Scores one place') plus the geographic scope (England, Wales or Scotland) and the preset-driven nature of the output. It explicitly distinguishes itself from get_area_signals (raw numbers) and compare_postcodes (multiple places), so an agent can select it without opening a sibling 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 both alternatives with the exact condition that selects them: 'For the underlying numbers rather than a composite, get_area_signals; for several places at once, compare_postcodes.' The singular-vs-multiple and composite-vs-raw distinctions cover the realistic routing decisions an agent faces among these siblings.

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