demo__demo_echo

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

No annotations are provided, so the description must carry the behavioral burden. It does disclose the key trait — output is the input returned unchanged ('原样回显'), and it is read-only with no side effects — but says nothing about error behavior for the required payload or any limits.

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?

One short clause with the essential verb and qualifier front-loaded; nothing is padded. The '[MCP:demo]' prefix is a namespace marker rather than semantic content, a minor bit of noise.

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?

For a one-string-parameter demo tool with no output schema and no annotations, the description covers enough: what it does, that it is read-only, and that the return is the input echoed back. Only edge-case behavior (empty or oversized payload) is left unstated.

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% ('payload' documented as '任意文本'), so the schema already explains the single parameter. The description adds no format, size, or content constraints beyond that, which is the expected baseline when the schema does the work.

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 concrete verb and object — '原样回显参数' (echo the parameters verbatim) — plus the qualifier '演示只读工具' (demo read-only tool). It is clearer than the bare name demo_echo, but it makes no attempt to differentiate from siblings (none of which overlap, so the omission is tolerable).

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 parenthetical '演示' (demo) implies this is a sample/testing tool rather than a production action, which weakly signals when to use it. There is no explicit when-to-use, when-not, or alternative named, so the guidance remains implied only.

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