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

The annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, and the description is fully consistent with that ("opens nothing by itself"). With no output schema, the extra disclosure of what the call actually returns (ordered screens, buttons, fields) is genuinely useful context an agent would otherwise have to discover by calling it.

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 operative information (returns steps, does not act, use browser tools next) is front-loaded and clear, but "from ChatGPT, Claude or any AI agent" is pure filler and the closing API-availability paragraph is long and partly tangential to invoking this tool. Trimming those two parts would sharpen it without losing anything an agent needs.

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-argument, read-only tool with no output schema, the definition covers what an agent needs: what it returns, that it has no side effects, and which tools to chain afterwards. The one loose end is the claim of "no API for creating, scheduling or sending a campaign", which sits oddly beside the emailoctopus_schedule_campaign and emailoctopus_send_campaign siblings and could make an agent hesitate about which route to take.

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 there is nothing for the description to disambiguate; the baseline for a parameterless schema applies. No misleading parameter language is introduced anywhere in the text.

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 states a specific verb and resource ("Set campaign recipients") and then corrects the natural reading of the name by clarifying it returns step-by-step instructions (screens, buttons, fields) rather than performing the change. That correction is valuable, but it never positions itself against the adjacent emailoctopus_schedule_campaign / emailoctopus_send_campaign siblings, which an agent could easily confuse with this one.

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 a clear workflow: call this first to get the how-to, then execute it with the cotlet_browser_* tools in the Cloud Browser. "Opens nothing by itself" removes the main ambiguity about side effects. It stops short of an explicit "do not use this if..." exclusion or a statement of when the sibling campaign tools are the right pick.

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