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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true, and destructiveHint=false, so the safety profile is fully covered. The description adds the meaningful behavioral constraint that only exchanges with active trading volumes are returned. The appended pricing block is harness metadata about billing, not tool behavior, so it earns no credit.

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?

The tool description itself is a single front-loaded sentence with no filler, and the key scope qualifier is stated up front. The only bloat is the injected pricing comment block, which is not part of the authored description.

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?

An output schema exists, so return values need not be explained, and annotations cover safety and idempotency. What remains thin is the routing relative to the near-identically named get_coingecko_exchanges_list sibling, which is the one thing an agent is most likely to get wrong.

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%, with both page and per_page documented including defaults and the 1...250 valid range, so the schema carries the parameter burden. The description adds no pagination or format detail beyond that, making the baseline 3 appropriate.

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 (query supported exchanges) and enumerates the returned fields (ID, name, country), which implicitly separates it from the bare get_coingecko_exchanges_list sibling. However, it never names that sibling, so an agent must infer the distinction from the 'with exchanges' data' phrasing rather than being told.

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?

There is no explicit when-to-use or when-not-to-use guidance and no alternative is named. The phrase 'that have active trading volumes' hints at the result scope, but nothing tells the agent why it should pick this over get_coingecko_exchanges_list or get_coingecko_exchanges_id.

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