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search_address

Search UK addresses by free text or postcode to find candidates with UPRN for detailed property lookup.

Instructions

Free-text address search across the full 29M-record UK address base.

Returns candidate addresses with their UPRN - use the UPRN with the other lookup_* / get_* tools.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
queryYesFree-text fragment, e.g. "10 Downing Street" or "Flat 4a Mill House".
postcodeNoOptional postcode to constrain the search.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior3/5

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

No annotations are provided, so the description carries full burden. It discloses the large database size and that it returns candidates with UPRN. However, it lacks details on rate limits, pagination, or any potential side effects, leaving gaps for a search tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, front-loaded with action and scope, no wasted words. Every sentence adds value.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool has only two parameters and an output schema likely covering return values, the description adequately explains purpose and next steps. It covers the main use case but could mention result limitations like pagination.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so baseline is 3. The description confirms the free-text nature and suggests postcode constrains search, but adds no new parameter meaning beyond what the schema already provides.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states it performs a free-text address search across a 29M-record database and returns candidates with UPRN. It implicitly distinguishes from sibling lookup/get tools by suggesting the UPRN is used with those, but does not explicitly name a sibling for differentiation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description indicates the tool is for finding addresses and obtaining UPRNs for subsequent lookups, providing clear context. However, it does not explicitly state when not to use it (e.g., if you already have a UPRN) or mention alternatives.

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

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