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

With no annotations supplied, the description carries the full burden and does at least disclose the shape of the response (fact ids plus verification states). It says nothing about ordering, completeness of the list, or whether all facts or a subset are returned, which matters for a listing tool with no output schema.

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?

A single front-loaded sentence with no filler; the returned fields are stated first. The trailing '(studentloanuk)' is slightly redundant given the tool name but aids domain scoping across the many sibling list tools.

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 zero-parameter listing tool with no output schema, stating that it returns fact ids and verification states covers what an agent needs to decide to call it. Minor gaps around ordering and list scope keep it short of a 5.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate. Baseline of 4 applies; the description adds no parameter noise, which is appropriate.

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 concrete verb ('List') and a specific resource ('fact ids + verification states'), scoped to the studentloanuk domain. It is clearly distinguishable from the sibling studentloanuk_get_fact (single fact) and studentloanuk_changes (change history), though it never names those siblings explicitly.

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?

Usage is only implied: an agent can infer this is the entry point for discovering which studentloanuk facts exist before calling studentloanuk_get_fact. There is no explicit when-to-use statement, no exclusions, and no mention of the alternative retrieval tools.

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