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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds valuable output context the annotations don't carry: the response is markdown and covers specific content sections. It does not mention behavior for an unknown/stale slug, which keeps it from a 5.

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 tight sentences: the return content is front-loaded, and the input-sourcing hint follows. Every clause earns its place with no redundancy.

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-only, fully annotated tool with no output schema, the description sufficiently covers both what goes in and what comes back. Only minor gap is absence of any error/not-found behavior for an invalid slug.

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?

With one parameter and 100% schema coverage, the schema already documents the slug and gives an example. The description adds provenance meaning beyond the schema by telling the agent where to source a valid slug from (list_services / search_services), which is genuinely useful.

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 ('Full details of one service') and enumerates the payload (inclusions, audience, brands, process, FAQs), which cleanly separates it from list_services and search_services. An agent can identify this as the single-item detail fetcher without opening the schema.

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?

'Use the slug from list_services or search_services' gives explicit provenance for the required input and implicitly defines the workflow. It lacks an explicit when-not-to-use clause (e.g., don't call this for browsing multiple services), so it falls short of a 5.

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