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

No annotations are provided, so the description carries the full behavioral burden. It does add genuinely useful context — a cost of 1 credit per call and the fact that the returned id feeds other crypto tools — but says nothing about auth requirements, error/empty-result behavior, or whether results are ranked.

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 short sentences with no filler: purpose and output first, cost last. Every clause earns its place.

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-optional-parameter lookup with no output schema, the description covers what the tool returns, an alternate mode, and its cost. It stops short of describing result shape (ranked list, exact vs fuzzy match) or failure behavior, but nothing critical is missing.

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% and there is only one parameter, so the baseline is 3. The description goes beyond the schema text by specifying that the query accepts a name or a symbol (the schema only documents the empty-query case), adding real semantic value for how to populate it.

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 ('Search coins by name or symbol') and clarifies the output's role ('the id used by the other crypto tools'), which helps separate it from crypto_markets or crypto_coin. It never names a sibling tool explicitly, so the differentiation is functional rather than direct.

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 'Leave empty to see trending coins' behavior is only in the schema, and the description hints at it with 'plus the trending coins right now.' There is no explicit when-to-use-this-vs-crypto_coin/crypto_markets guidance or prerequisite statement; usage must be inferred.

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