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

Annotations already cover read-only, open-world, idempotent and non-destructive behavior. The description adds genuinely new operational context the annotations cannot express: x402 pricing ($0.01/call), the prepaid x-credit-token header for unlimited calls, no free tier, and no API key requirement. This is useful payment/auth disclosure that an agent needs before invoking.

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 the purpose and data source, then pricing, then auth. Slightly redundant in restating 'profiled on Base' twice and repeating 'Base' three times, but every sentence carries information and nothing is padded.

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?

An output schema exists, so return values need not be explained, and the description still summarizes the payload. With zero parameters and a low-complexity read, the definition covers purpose, source, and payment model adequately; only explicit sibling routing 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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; baseline is 4. Schema coverage is 100% and no enum/nested complexity exists.

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 and resource ('Returns the latest tokens profiled on Base from the DexScreener feed') plus the payload fields (address, description, links). It is clear what the tool does, but with a crowded sibling set (trending_tokens, launch_snipers, token_age, b20_launch_radar) it never explicitly says how it differs from those.

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?

'Great for discovery bots hunting new launches early' gives a use-case context, which is more than nothing. However there is no when-not guidance and no named alternative for an agent trying to decide between this and the other launch/trending tools.

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