lucky_update_ddns

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

Beyond the annotations, the phrase 'complete native Lucky JSON object' signals that the update expects the full object, implying replacement rather than merge—a non-obvious behavioral detail. It does not contradict the idempotentHint/readOnlyHint annotations, and it adds context about what the value payload should be.

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 efficient sentence that front-loads the operation and resource. Every word contributes meaning; no filler or redundant restatement of the tool name.

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 two-parameter mutation with no output schema, the description is adequate but leaves gaps: it does not state return behavior, failure conditions, or how to obtain the 'complete native Lucky JSON object'. Sibling tools like lucky_list_ddnss exist to fill that gap, but the description does not point to them.

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 0%, so the description must compensate. It adds meaning to 'key' as the identifier and to 'value' as a complete native Lucky JSON object, giving more guidance than the bare schema. It still leaves the exact structure of the native object unspecified, but the description provides enough directional context for an agent to know where to obtain it.

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 identifies the action ('Update') and the resource ('a Lucky ddns') clearly, and specifies the inputs ('its key and complete native Lucky JSON object'). This is enough to distinguish it from create/delete/list siblings by operation and resource, though it does not explicitly name alternatives.

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 implies the tool is for modifying an existing DDNS entry ('Update ... using its key'), so an agent can infer when to use it relative to create/delete. However, it provides no explicit guidance on when to prefer this tool over siblings or caution about requiring a complete object rather than a partial patch.

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