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

Annotations already declare readOnlyHint=true, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description usefully adds that it 'opens nothing by itself' and that execution must go through the browser tools. It does not describe the shape of the returned instructions or any account/permission prerequisites, so it adds context but not depth.

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 routing information comes early and is useful, but the sentences are long and loosely punctuated, and the closing note about the ProSolutions Paired host publishing 'API help' is tangential and slightly confusing. The 'from ChatGPT, Claude or any AI agent' clause is filler that does not help an agent decide or invoke.

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, read-only instruction tool with no output schema, the definition covers what it returns (screens, buttons, fields) and what to do next. It is nearly complete; only the exact return format and any permission/account preconditions are left implicit.

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; baseline applies. The description correctly implies no input is needed since everything is derived from the user's own account context.

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 names a specific verb and resource (switch calendar provider in the user's own Paired Plus account) and then clarifies the actual mechanic: it returns step-by-step instructions rather than performing the switch. That clarification rescues what would otherwise be a misleading name, though the opening sentence still frames the tool as the action itself. No sibling is named to differentiate it from e.g. paired_plus_set_calendar_preferences.

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 explicitly routes the agent: call this first to get instructions, then perform the switch with the cotlet_browser_* tools in the user's Paired Plus Cloud Browser. That is clear sequencing guidance. It lacks any when-not guidance (e.g. when the user already knows the steps or lacks a Paired Plus account).

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