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

Annotations already declare readOnlyHint/idempotentHint true and destructiveHint false, so safety is covered structurally; the description still adds the non-obvious point that the call performs no action itself and only returns a step-by-step procedure. The note about DINGG publishing no public API or API keys explains why the browser path is required.

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 is front-loaded in the first sentence, but the phrasing is strained, especially the fragment "DINGG's official API: DINGG publishes no public API, API keys or developer documentation," which restates itself. The verification date is useful currency signal, though the sentence could be halved without losing information.

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 description covers what it returns (step-by-step screens, buttons, fields), what it does not do (open anything), and how to continue with cotlet_browser_*. Nothing essential is missing, though a note on required browser-session state would close the last gap.

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 baseline is 4 and there is nothing for the description to disambiguate. The description usefully makes clear that the single implicit input — the user's own DINGG account — is the only scoping factor.

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?

Names a specific resource and scope ("today's bookings in the user's own DINGG account") and then corrects an easy misreading by stating it "returns how to do it in DINGG step by step (screens, buttons, fields)" rather than the booking data itself. The verb "List" in the name is mildly at odds with the guide-returning behavior, but the description resolves that ambiguity immediately.

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?

"opens nothing by itself; then do it with the cotlet_browser_* tools in the user's DINGG Cloud Browser" gives an explicit follow-up workflow and names the alternative tool family. It stops short of stating prerequisites (e.g., whether a browser session must already exist) or when to prefer a sibling like dingg_find_free_slots, so it is clear context rather than full when/when-not guidance.

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