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

With no annotations, the description carries the full burden. It does disclose the important safety trait – a fixed whitelist, no arbitrary execution – which is genuinely useful. But it says nothing about whether dispatched commands mutate state (examples like stall.buy, play.linkgame.move clearly do), what permissions are required, or whether calls are idempotent.

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?

Three sentences, no filler words, and the negative constraint is placed at the end where a reader will see it. The first sentence, however, spends significant length on the '门房/窗口' metaphor, which carries less actionable information than a plain statement of the dispatch mechanism would.

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?

There is no output schema and no annotations, so the description should have covered the response shape and side-effect profile. For a generic command dispatcher whose actual behavior is entirely determined by the subcommand, omitting anything about return values or mutation semantics leaves an agent under-informed about what to expect from a call.

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 coverage is 100%, so the baseline is 3. The description only restates what the schema already documents ('help 时可传 path'), adding just the condition '参数不确定时' on top of it; it adds no format, enum, or example detail beyond the schema's own whitelist examples.

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 opening sentence states a concrete mechanism – the caller writes a fixed command and it is routed to the matching handler – and the last sentence explicitly bounds the tool ('这里不是 shell，不执行任意命令'). The '门房/领到对应窗口' metaphor is vague on first read but is immediately grounded by the command/path guidance that follows.

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?

It gives actionable routing rules: 'help 就是旧 guide 合并后的统一指引入口' and '参数不确定时传 path', which tells the agent exactly when to fall back to help. The exclusion '这里不是 shell，不执行任意命令' is an explicit when-not-to-use, though there are no sibling alternatives to compare against (none exist).

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