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

Annotations already declare readOnly, idempotent and non-destructive, so safety is covered structurally; the description adds value by listing the concrete fields the call surfaces, which the annotations cannot convey. It does not mention behavior for missing or stale IDs, which is the main remaining gap for a lookup-by-key tool.

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?

One sentence, front-loaded with the action and scope, then the payoff (returned fields). No redundant restatement of the title and no 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?

For a single-parameter read with no output schema, the description does the necessary extra work by enumerating the returned data, so an agent can judge whether the result answers its question. Combined with the annotations and fully documented schema, nothing essential is missing.

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% and the single 'id' parameter is already documented as 'The tender ID shown in search_tenders results'. The description's phrase 'by its ID (from search_tenders results)' restates that provenance rather than adding new meaning, so baseline 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 ('Get the full details of one UK tender by its ID') and enumerates what is returned (buyer, value, closing date, notice text, official notice link). This clearly distinguishes it from the sibling list/search tools, which return multiple tenders rather than one full record.

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?

Explicitly ties invocation to a prior step: the ID comes 'from search_tenders results', so the agent knows this is a follow-up detail call, not an entry point. It stops short of stating what to do when an ID is unknown or invalid, or when to prefer search_tenders alone.

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