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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds what the response will contain (plain-language explanation of pricing and comparable attributes), which is useful since no output schema exists, but it omits any behavior on invalid or unknown market ids.

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 resource, and the colon-style enumeration of contents adds information without padding. Nothing is wasted or redundant.

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, read-only introspection tool with full schema coverage and no output schema, the description usefully explains what the returned explanation covers. It is close to complete, missing only error/unknown-id behavior.

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 'market' parameter is documented in the schema as a market id from list_markets with examples. The description adds no syntax, format, or validation detail beyond that, so the 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 ('explain') and resource ('one market') and enumerates the content of the explanation (what it is, pricing, filterable attributes). It implicitly distinguishes itself from list_markets by scoping to a single market, but never names a sibling to route the agent explicitly.

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 only implied: 'one market' suggests this is a follow-up to list_markets and a prerequisite for compare_offerings, but the description states no when-to-use condition, no prerequisite, and no alternative to prefer. An agent must infer the placement from the singular scope.

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