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

Annotations already declare readOnly, idempotent, non-destructive and open-world, so the safety profile is covered. The description adds genuinely new operational context: it is a free tier with a daily per-caller quota, and payment/auth credentials belong in the MCP request headers (X-Payment / X-Payment-Tx / Bearer), explicitly not in the parameters — a detail an agent could not infer from structured fields.

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 same content is repeated three times across the English question line, the [zh] block, and the [en] block, with duplicated vendor-asset description and stray fullwidth separators. The core fact (free, returns price/float ratio/grade, auth in headers) is buried rather than front-loaded once.

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, the description does name the return fields, and the quota/payment-header notes cover the tricky operational part. But for a 2-parameter tool with zero schema documentation, the parameters remain opaque, so an agent could not reliably construct a call from this definition alone.

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% — both parameters ('id', 'token') carry only bare titles. The description merely restates 'Args: token, id' without explaining what 'id' identifies, whether token is a symbol or contract address, expected formats, or that both are optional. It does not compensate for the coverage gap.

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 frames the tool as answering 'what is the token supply pressure' and names the returned fields (price, float ratio, supply pressure grade), which is a concrete verb-plus-resource statement. However, it never distinguishes itself from the sibling 'token-supply.pressure', which by name alone appears to cover the same ground, so the agent gets no disambiguation.

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 is only implied through the natural-language question the tool answers; there is no explicit statement of when to call this versus the closely named 'token-supply.pressure' sibling, and no prerequisites beyond the quota note. The mention of a free daily per-caller quota gives useful context for decision-making but is not when/when-not guidance.

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