snapshot_create_from_url

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

With no annotations, the description carries the burden of behavioral disclosure. It does state the return value and the URL validity constraint, which is helpful. However, it is silent on permissions, synchronous vs asynchronous behavior, side effects, cost implications, and failure behavior.

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 organized with Args, Returns, and Note sections, and the main action is front-loaded. It is concise, though there is minor redundancy between the url argument note and the final note about valid snapshot files.

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 simple two-parameter tool with an output schema, the description covers the required input, the optional parameter, and the special URL constraint. It lacks usage-alternative context, which keeps it from being fully complete, but nothing essential for invoking it is missing.

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%, so the description must compensate. The Args section adds real meaning: 'url' is required and must be a valid snapshot URL, and 'description' is optional. This is materially more useful than the raw schema, which only declares their types.

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 first sentence, 'Create a snapshot from a URL,' names a specific action and resource. The note further clarifies that the URL must point to a valid Vultr snapshot file. It does not explicitly contrast with the sibling 'snapshot_create' tool, so it misses the top score but remains clearly scoped.

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 gives no guidance on when to use this tool instead of snapshot_create or other snapshot operations. It also does not mention prerequisites, alternatives, or exclusions beyond the URL-validity note. The agent must infer when this tool is appropriate.

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