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

The key behavioral fact — 'opens nothing by itself' and instead returns a procedural walkthrough — is disclosed explicitly and matches readOnlyHint/destructiveHint=false, so no contradiction. This is non-obvious from the name and would otherwise cause an agent to believe a campaign had been created; the description also names the follow-on tools required to actually complete the task.

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 behavior and the browser-tool handoff are front-loaded and useful, but the final sentence about ClickSend's official REST API and narrow MCP server (with a dated check) is vendor boilerplate that does not help an agent select or invoke this tool. It inflates the definition without adding operational value.

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 the burden of explaining what comes back, and it does ('how to do it in ClickSend step by step (screens, buttons, fields)'). The one remaining gap is how the agent should supply the campaign content and target audience, since the tool takes no inputs — the description leaves that to be inferred.

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 schema has zero parameters and 100% coverage, so the baseline is 4. The description adds no parameter meaning, but there is nothing to describe; it does implicitly explain that campaign details come from conversation context rather than arguments.

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 goes beyond the name by stating that the tool returns step-by-step ClickSend instructions (screens, buttons, fields) rather than creating anything, which prevents an agent from mistaking it for an executor. However, the opening sentence still says "Create SMS campaign," so the agent must read to the second sentence to learn the tool is actually a guide, and the closing paragraph about ClickSend's REST API/MCP server muddies what the tool itself does.

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 an explicit workflow: call this to get the step-by-step procedure, then perform it with the cotlet_browser_* tools in the user's Cloud Browser. That is a clear handoff to named sibling tools. It stops short of saying when NOT to use this (e.g., for a straight API send via clicksend_send_sms), so it is not fully exhaustive guidance.

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