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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds the useful 'cost: free' attribute and the breadth of data returned ('market state overview'), but says nothing about freshness, caching, or how many symbols are covered. With annotations doing the heavy lifting, this is an adequate but not rich addition.

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?

A single compact sentence with the category tag 【行情】 and the resource name front-loaded, followed by the content list and the cost note. Nothing is padded, though the bracketed tag format is slightly templated rather than natural prose.

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 parameters, the description carries the burden of telling the agent what comes back, and it does list the key properties (snapshots, percent change, volume). It falls short only on scope details — which symbols count as 主流 and how current the data is — that an agent might want before relying on it.

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 no parameters, so there is no parameter meaning the description needs to supply; baseline 4 applies. The description correctly omits any parameter talk, which is appropriate for a zero-arg tool.

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 names the resource specifically and enumerates the content it returns (主流币种快照、涨跌幅、成交量) plus the framing 市场状态概览, so an agent can tell this is a broad market-state read rather than a single-symbol lookup. It does not mention or distinguish itself from close siblings such as platform_market_quote, platform_market_ticker, or platform_market_factors, which is the missing piece for a 5.

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: '总览' (overview) suggests using this first for a market-wide picture, while the (cost: free) tag signals there is no penalty to calling it. There is no explicit statement of when to prefer it over platform_market_ticker (per-symbol) or platform_market_quote, and no exclusions are given.

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