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

With readOnlyHint/idempotent/non-destructive already declared, the description adds the important behavioral fact that the tool "opens nothing by itself" — a non-obvious guarantee for something named send_dm. The note that Skool has no public API explains why a browser-agent handoff is required, which is useful causation rather than filler. It stops short of describing the shape or length of the returned guide.

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 fits in one sentence but is delivered as a semicolon-chained run-on mixing purpose, return value, side-effect status, and next-step instructions. The closing API-status sentence is defensible context but is placed after the operative instructions, so the actionable content is not perfectly front-loaded.

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, no-output-schema tool, the definition covers what comes back (screens, buttons, fields), what does not happen (no browser action), and how to proceed. The only real gap is that it never says what the caller must supply to the downstream browser tools, leaving the agent to infer that recipient and message text are needed.

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?

Zero parameters, so there is nothing for the description to disambiguate; baseline 4 applies. One could note that the recipient and message content are apparently supplied later to the browser tools, but the schema carries no such fields to explain.

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 action and platform ("Send DM in the user's own Skool account") and then immediately clarifies the actual mechanic: it returns a step-by-step guide rather than performing the send. This resolves the tension with the name/title, though an agent skimming only the first clause could still misread it as a direct-send tool.

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 execution path — take the returned guide and act on it with the cotlet_browser_* tools in the Skool Cloud Browser — which is genuinely actionable routing. It does not, however, distinguish this from sibling tools like send_message or post a comment, nor state prerequisites (does the browser need to already be open, is a logged-in session required?).

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