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

The description mentions a cost ($0.02), which is a behavioral disclosure beyond parameters. However, with no annotations, it should also note read-only nature, rate limits, or other traits. The cost mention is useful but insufficient for full transparency.

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 description is extremely short (one sentence plus cost), which is concise but omits critical details. It is front-loaded with the core purpose, but the brevity sacrifices completeness.

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?

Given no output schema, no annotations, and incomplete parameter explanations, the description is inadequate. It does not clarify return format, max coins, or sorting. The agent lacks sufficient context to reliably invoke this tool.

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 schema has 0% description coverage, so the description must compensate. It mentions metrics but does not explain the parameters (vs, coins, api_key) beyond their defaults. The agent must infer that coins is a comma-separated list and vs is the quote currency. This is minimal added value.

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?

The description clearly states the tool performs a 'Side-by-side comparison of multiple coins' and lists specific metrics (price, market cap, volume, 24h change, ATH). This makes the purpose clear, but it does not explicitly distinguish it from sibling tools like get_price or get_coin that also provide similar metrics for individual coins.

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 provides no guidance on when to use this tool versus alternatives, nor any prerequisites or exclusions. It simply states what it does without context, leaving the agent to infer usage.

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