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

With no annotations, the description carries the full behavioral burden, and it does disclose a meaningful trait: a do_not_answer refusal path for drifted or unverified facts, plus a 'never guesses' guarantee. However, it says nothing about what a successful fact contains, what the refusal response looks like structurally, or any access constraints.

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 short sentences with no filler, and the core action is front-loaded ahead of the refusal caveat. The word 'pack' is slightly internal jargon, but overall it is tight and readable.

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 one-parameter lookup tool with no annotations and no output schema, the definition covers purpose and the key failure mode but omits parameter semantics and any sense of the returned fact's shape. It is adequate to attempt a call but not to predict the response.

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 0% for the single required parameter fact_id, and the description adds no meaning about its format, provenance, or where to obtain a valid value. With one undocumented parameter, the description should compensate but does not.

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?

The description states a specific verb ('Get') and resource ('one verified fact') scoped to the tvlicenceuk pack, which distinguishes it from sibling list-style tools such as tvlicenceuk_list_facts. It stops short of explicitly naming a contrasting sibling, so the differentiation is implied by scope rather than stated.

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 implied: fetch a single fact by identifier, with a hint that unverified or drifted content is withheld. There is no explicit statement of when to prefer this over tvlicenceuk_list_facts or what to do when a refusal occurs, leaving the agent to infer the workflow.

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