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

Adds real context beyond the read-only/idempotent/openWorld annotations: the data source (live GOV.UK Content API), the return shape (headed plain-text subsections plus machine-readable alert status), the known limitation that FCDO warning maps are images and are not returned, and a cost of 1 credit. The only gap is nothing about freshness/rate limits beyond the credit note.

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?

Front-loaded with the use-case question and the verb+resource, followed by return format, provenance, limitation, disclaimer and cost in a tight sequence. Every sentence contributes, and the cost hint is correctly placed last in parentheses.

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, so the description carries the burden of describing return values, and it does so (plain-text subsections plus machine-readable alert status) while also flagging excluded content (maps) and the policy-terms caveat. Nothing needed to call this single-parameter, read-only tool correctly 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 coverage is 100% for the single 'country' parameter, and the schema already documents that names, alternative names (city/island) and GOV.UK slugs are accepted. The description adds no parameter-level detail beyond that, so it sits at the baseline for fully documented schemas.

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 ('Returns the FCDO Warnings and insurance section for one country') and pins down the exact section, which implicitly separates it from siblings like travel_advice_safety, travel_advice_health and travel_advice_entry_requirements. The opening question ('Will my travel insurance still be valid?') frames the agent-relevant intent rather than duplicating the name.

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?

The insurance-validity framing plus the caveat that payout depends on the policy's own terms implies when this tool is the right pick, but the description never explicitly names an alternative or a when-not condition. With siblings covering safety, health and entry requirements, an explicit routing sentence would have raised this score.

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