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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, and the description corroborates them with the non-obvious clarification that the tool opens nothing by itself and only returns a step-by-step walkthrough of screens, buttons and fields. That is genuinely additive behavior detail rather than a restatement of the hints. It stops short of saying how large or structured that returned guide is.

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 single most important fact for an agent, that this tool does not perform the action, is buried in the second half of the first sentence rather than front-loaded. The trailing API v2 note including "(checked 17 Oct 2026)" is meta-commentary of marginal value to an invocation decision and pads an otherwise short definition.

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?

With no parameters and no output schema, the description carries an appropriate load: it states scope, that the call is a read that returns procedural guidance, and which sibling tools actually execute the creation. A sentence on what the returned guide contains beyond "screens, buttons, fields" would close the remaining gap.

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?

The tool takes zero parameters, so the baseline of 4 applies and the description has no parameter semantics to add. Its mention of screens, buttons and fields pertains to output, not input, and nothing about the empty schema is misrepresented.

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 names a specific verb and resource ("Create gallery in the user's own SmugMug account") and then corrects the obvious misreading by stating it "Returns how to do it in SmugMug step by step... and opens nothing by itself." That second clause is essential because the tool name implies a write action, but it arrives after the misleading opening and the account-scoping ("user's own") is the only sibling differentiation offered.

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?

It gives clear routing: get the steps here, then execute with the cotlet_browser_* tools in the SmugMug Cloud Browser, which matches the actual sibling toolset. It also preempts the "why not use the API" question by noting there is no SmugMug-hosted MCP server. It does not explicitly exclude other sibling tools such as smugmug_upload_photos, but the context is unambiguous enough.

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