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

With annotations already declaring readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, the description adds the key behavioral point: it returns instructions and opens nothing, so the agent must use browser tools to perform the action. It could say more about authentication prerequisites, but the core non-annotation behavior is disclosed.

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 key point is front-loaded: it returns instructions and does not open anything itself. The 'ChatGPT, Claude or any AI agent' audience phrase and the official API/MCP server note are peripheral and could be compressed or omitted.

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 instructional tool with no output schema, the description supplies the missing nature of the output (step-by-step screens, buttons, fields) and the downstream browser-tool workflow. It is largely complete, though it could explicitly state that the user must already be logged into ClickSend.

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 has zero parameters, so the baseline is 4. There are no inputs for the description to disambiguate, and it correctly does not invent parameter details.

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 identifies the ClickSend SMS resource and states that it returns step-by-step UI instructions ('screens, buttons, fields') rather than sending directly, which separates it from the actual browser actions. However, the tool name and title 'Send SMS' plus the opening phrasing make the purpose initially read like a direct send action, so it is clear but not perfectly crisp.

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 useful workflow guidance by saying to use cotlet_browser_* tools afterward and that this tool opens nothing by itself. It does not explicitly state when not to use it or when to prefer the official API or MCP server; the API note is informational rather than a routing rule.

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