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

Annotations cover the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=true, openWorldHint=false), so the bar is lower; the description still adds valuable non-obvious behavior by disclosing the two-phase preview/confirm flow. It does not state what happens on a failed or stale confirm_token, or explain the idempotency claim, so it stops short of full transparency.

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?

Two tight sentences, no filler, with the operation stated first and the two-step constraint immediately after. Every clause earns its place.

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 3-param mutation tool with no output schema, the description is complete enough: it covers purpose, the confirmation workflow, and the confirm_token return. Only edge-case behavior (expired/invalid token, error outcomes) is left unaddressed.

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 100% and both required ids point to their source lists (list_my_bottles, list_my_collections). The description reinforces the confirm_token workflow but adds little syntax or meaning beyond what the schema already documents, so the baseline 3 applies.

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 precise verb+resource ('Add ... bottle ... to ... collection') that unambiguously separates it from remove_from_collection and create_collection. An agent can identify the operation without opening the schema.

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 explicit invocation guidance: the first call only previews and returns confirm_token, the preview must be shown to the user, and the call is repeated only after user agreement. This is exactly the when/how guidance an agent needs for a confirmation-gated mutation.

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