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

No annotations exist, so the description carries the full burden. It usefully discloses the payment mechanics (0.01 USDC on Base via x402, or 12 sats Cashu NUT-24, or 12 sats Lightning L402), which is real behavioral context an agent must know before invoking. However it omits permissions, rate limits, and failure modes.

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 sentences, front-loaded with the capability and followed by the cost information. Both sentences earn their place; the payment sentence is long but necessary since cost is a real invocation constraint.

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?

With no output schema and no annotations, the description should do more: it never clarifies that zero parameters are required, what happens if both or neither url/text are supplied, or the shape of the returned keyword data. Adequate but with clear gaps for a tool an agent can call with no arguments.

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 both params (url, text) are undocumented in structured data. The description partially compensates by indicating a text-vs-web-page input split, but does not clarify that both are optional, whether one is required, or how conflicts between url and text are resolved.

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 operation (word count plus top keywords/bigrams, stopwords removed) on a specific resource (text or a web page). The function is clearly distinct from siblings like extract_page, readable_text, and readability, so an agent can identify it without opening the schema.

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 phrase 'for text or a web page' implies the two input modes but never says when to choose url vs text, whether they are mutually exclusive, or when another sibling (e.g. readable_text) would be preferable. Usage is only implied, not stated.

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