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

Annotations already cover read-only, idempotent and non-destructive behavior, so the description's extra value is the explicit 'No authentication' requirement and the warning that full=true returns a document 'many times larger', which is real cost/payload context. It also discloses what the summary omits (worked examples, legal text, marketplace comparison), which the annotations cannot convey.

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 sentences with no filler; the default summary behavior is front-loaded and the full=true expansion follows. The first sentence is somewhat inventory-like and dense, but every clause carries information an agent needs.

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 must describe the return value, and it does so by enumerating the summary sections and the extra sections in full mode. Missing only the return format/serialization detail, which is minor for a read-only informational tool.

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%, so the formal baseline is 3, but the description goes beyond the schema by naming the concrete contents unallocated by full=true and flagging the size differential. That reduces the risk of an agent accidentally requesting the full document when it only needs a summary.

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 (returns) and enumerates the resource content: what the service does/does not do, refused categories, prices, payment. That is far more informative than the name 'list_services' alone and clearly separates it from the transactional siblings (confirm_delivery, request_quote). It lacks any explicit contrast with a sibling, so it stops short of a 5.

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 description explains the full=true versus default tradeoff, which is genuine usage guidance for the one parameter. However, it never says when an agent should reach for this tool versus get_status or request_quote, nor any preconditions. Usage is implied rather than stated.

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