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

With no annotations, the description carries the full burden, and it does add useful facts: the tool is keyless (no auth), it returns a derived 'depeg-risk band' rather than raw numbers, and it has a stated cost basis. However, it says nothing about rate limits, error behavior for unknown symbols, or data freshness beyond the 24h/7d fields.

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 purpose and output list are front-loaded in one dense clause, but the trailing pricing fragment is garbled ('Keyless, from D From $0.005 USDC.'), which reads as corrupted boilerplate and dilutes clarity. The core is efficient but the tail is not.

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 lookup with no output schema and no annotations, the description enumerates the return fields so the agent knows what it gets back and confirms no auth is needed. Missing usage routing and error semantics are minor gaps rather than blocking ones.

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 0% and the single 'symbol' parameter has no schema description, so the description must compensate. The examples '(e.g. USDC, USDT, DAI)' establish that symbol is a stablecoin ticker, which is meaningful guidance, though format/validation rules are not stated.

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+resource ('stablecoin peg health') and enumerates the concrete outputs (price, peg deviation in bps, 24h/7d change, market cap, depeg-risk band), which clearly separates it from generic siblings like crypto_price or token. It does not name any sibling explicitly, so differentiation is implicit rather than explicit.

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 statement of when to use this tool versus alternatives such as crypto_price, token_report, or trust_check, and no prerequisites or exclusions beyond the passing 'Keyless' note. The agent must infer usage from the purpose sentence alone.

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