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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true, openWorldHint=false, and the description is consistent with them while adding real context: the return value is step-by-step UI instructions (screens, buttons, fields), it performs no action itself, and completion requires a follow-up Cloud Browser session. It stops short of saying what happens when no browser session exists or what the guide contains if the event cannot be found.

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?

Three sentences, each doing a job: what is returned, how to execute it, and why the official API is not an option. The phrase "from ChatGPT, Claude or any AI agent" is filler, and the purpose statement would be better front-loaded as "Get step-by-step steps to update..." rather than "Update event...".

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 guidance tool, the description covers what comes back and what to do next, which is most of what an agent needs. It omits how the event to update is specified with no inputs, and whether a Cloud Browser session must already be open before calling — both material for correct invocation.

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?

With zero parameters the schema carries no semantics to expand, so the baseline applies and there is nothing the description could contradict. One residual gap: nothing explains how the target event is identified (presumably supplied conversationally), which an agent might expect to be a parameter.

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 opening clause "Update event in the user's own Bandsintown account" reads like a mutation verb, and only the second clause ("Returns how to do it in Bandsintown step by step... and opens nothing by itself") reveals the tool actually returns a guide rather than performing the update. The resource is specific, but the verb is misleading until the reader gets to the correction, so an agent skimming the first sentence could mis-select it.

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 onward: "then do it with the cotlet_browser_* tools in the user's Bandsintown Cloud Browser," naming the actual alternatives for execution. The API note (public API is read-only for artist info and events) explains why this guide path exists instead of a direct API call. It lacks an explicit when-not/exclusion statement, e.g. how it differs from bandsintown_add_event or bandsintown_delete_event.

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