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

With no annotations, the description carries the full burden and does well: it discloses cost ($0.01 USDC), accepted payment chains (Base or Solana), absence of account/API-key requirements, and that failed calls are not charged. It omits rate limits and response shape, but the commercially important behavior is covered.

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?

Front-loaded with 'Paid.' followed by purpose, price, terms, and endpoint URL — no filler. The telegraphic fragments are dense but readable; a slightly smoother sentence structure would earn a 5.

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 zero-param tool with no output schema, the description compensates by enumerating the three returned fields and stating the payment mechanics. An agent has everything needed to decide and call, though rate-limit or latency expectations are absent.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; baseline 4 applies. The schema is an empty object and the description correctly does not invent inputs.

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?

Names the specific asset (Midas Fasanara Global / MGLOBAL) and the exact payload: live USD price, 24h change, and market-cap rank. Among hundreds of near-identical buy_tok_* siblings, the token name is the only differentiator and it is stated unambiguously.

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 makes clear this is the MGLOBAL-specific price endpoint, so usage is implied by the token name, and it states the paid/no-account conditions. It never explicitly routes the agent away from generic alternatives like buy_crypto_price or the other buy_tok_* tools, so selection relies on the name alone.

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