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, so the safety profile is covered. The description adds genuinely useful behaviour beyond that: it performs no action and opens nothing, and it discloses that PhotoShelter has no self-service API key path (support must be contacted), which affects whether an API route is viable.

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 message is front-loaded and useful, but the description is a single run-on sentence packing three unrelated ideas, and the API-key aside with the date stamp "(checked 8 Nov 2026)" is tangential and dated in the future, weakening credibility rather than earning 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 read-only, zero-parameter guidance tool with no output schema, the definition covers what comes back conceptually and what to do next, which is close to sufficient. It omits what inputs the agent must collect from the user before asking for steps (gallery identity, access level) and gives no sense of how the returned instructions are shaped.

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?

With zero parameters and full schema coverage, the baseline is 4; there is nothing for the description to disambiguate at the schema level. It could have gone further by explaining how the target gallery and desired access level are conveyed (presumably in the conversation), since the tool itself accepts nothing.

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 gives a specific verb and resource ("Set gallery access in the user's own PhotoShelter account") and then immediately corrects the obvious misreading of the tool name by stating it "Returns how to do it in PhotoShelter step by step ... and opens nothing by itself." That makes the real nature of the tool — a guidance emitter, not an executor — unambiguous, which is more than the title alone conveys.

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 states the workflow precisely: call this to get the steps, then perform them with the cotlet_browser_* tools in the user's PhotoShelter Cloud Browser, which is a clear handoff to the correct sibling family. It does not, however, differentiate from photoshelter_share_gallery or say when a different access-related tool would be the better choice.

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