subscribeDcp

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

The annotations already declare readOnlyHint=true and openWorldHint=true, so the read-only/open-world behavior is covered by structured metadata. The description adds the authentication requirement and implies a stream of change events, which is useful context, but it does not describe subscription lifecycle, message delivery behavior, or stopping semantics.

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 description is a single short sentence that front-loads the core action and resource, with no filler. The authentication note adds relevant information without bloating the text.

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 subscription tool with no output schema and no parameter documentation, the description is too thin. It omits what DCP is, what the change messages look like, how long the subscription lasts, and how timeout/count parameters control behavior.

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%, and the description does not explain timeoutMs or messageCount or how they affect the subscription. The parameter names and schema defaults provide limited inference, but with no description-level compensation, the semantics remain under-specified for an agent.

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 uses a specific verb ('订阅' / subscribe) and a clear resource ('DCP 变动' / DCP changes), so an agent can tell it is a subscription operation for DCP updates. However, it does not explicitly differentiate this tool from sibling subscription tools such as subscribeTickers or subscribeSystemStatus, and it leaves the DCP acronym unexplained.

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 description provides no guidance on when to prefer subscribeDcp over alternative subscription tools or when it should not be used. The only usage-related hint is '需要鉴权' (authentication required), which states a prerequisite rather than a selection condition.

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