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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true and openWorldHint=false; the description is consistent with all of them. It adds useful behavior beyond the annotations: the return format is step-by-step UI instructions, and it emphasizes that nothing is opened or executed server-side. It does not say how the target gallery is determined.

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 core sentence is well front-loaded, but the closing aside about SmugMug API v2 and 'checked 17 Oct 2026' is marketing/justification material rather than invocation guidance. Some of that space would be better spent on how the target gallery is identified.

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 zero-parameter guidance tool with no output schema, the definition covers the essentials: what is returned and which tools to use next. However, it omits prerequisites such as whether a SmugMug Cloud Browser session must already be open, and it does not resolve how the gallery is selected, which is the main ambiguity an agent will hit.

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?

There are zero parameters, so the baseline would be 4, but the description never explains the notable oddity that a gallery-specific privacy change takes no gallery identifier. An agent would reasonably wonder whether the gallery is inferred from the browser session or from conversation context, and the definition leaves this unresolved.

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 clarifies that despite the imperative name, the tool does not perform the change: it 'Returns how to do it in SmugMug step by step (screens, buttons, fields) and opens nothing by itself.' That is a specific, honest statement of purpose and distinguishes it from smugmug_list_galleries or smugmug_create_gallery. It falls short of 5 only because the tool name implies a mutation while the actual function is instruction retrieval.

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?

Explicitly routes the agent: use this to get the steps, then execute with 'the cotlet_browser_* tools in the user's SmugMug Cloud Browser.' That is a clear when-to-use and a named follow-on path. No exclusion criteria are given (e.g., when smugmug_list_galleries should come first to identify the gallery).

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