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

With no annotations, the description carries the full behavioral burdenessed. It discloses the $0.002 per call cost and describes the output contents and selection behavior (depegged coins plus largest by supply). It does not specify response format or pagination, but for a read-only monitor the main operational facts are present.

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. The core behavior is stated first, followed by the pricing constraint. Every word 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 simple read-only tool with zero required parameters and a fully documented schema, the description is nearly complete. It covers what data comes back and the cost, and the sibling list provides selection context. The main gap is a structured return format, but no output schema was provided.

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%, so the schema already explains each parameter. The description adds context around 'depegged' and 'largest by supply' which loosely maps to threshold/limit/minCirculating, but it does not materially clarify parameter usage beyond the schema.

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 states a specific scope: it returns depegged USD stablecoins plus the largest stablecoins by supply, along with price deviation and 1d/7d supply change. This clearly distinguishes it from the yield-focused sibling tools without needing to name them.

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?

Usage context is implied by the tool's domain and the sibling list: it is for monitoring stablecoin peg health rather than yield exploration. However, there is no explicit when-to-use/when-not-to-use guidance or mention of alternatives.

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