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

The description explains why readOnlyHint=true is correct: the tool returns instructions and "opens nothing by itself," so no side effects occur until browser tools are used. It also discloses the crucial external constraint that Patreon's official API v2 cannot edit tiers, which justifies the browser-based route. It stops short of describing what the returned steps look like in structure or how current they are.

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 and the browser-tool handoff are front-loaded in the first sentence, and the API note is genuinely load-bearing rather than filler. The phrase "from ChatGPT, Claude or any AI agent" is mild marketing padding that could be cut without loss.

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 is returned (screens, buttons, fields) and what to do next, which is what an agent needs to sequence calls. The only meaningful omission is how tier selection is communicated given the empty input schema.

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 and the description adds no parameter claims, which is the correct baseline for a no-arg tool. One residual gap: it never says how the target tier is identified if no input is accepted, leaving the agent to infer the guidance is generic.

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?

"Update tier in the user's own Patreon account" plus the clarifying clause "Returns how to do it in Patreon step by step... and opens nothing by itself" makes the verb+resource+deliverable unambiguous. An agent can tell this is a guidance tool, not a mutation, and can distinguish it from patreon_create_post and the cotlet_browser_* action tools without opening any schema.

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 states the workflow explicitly: call this to get the steps, then execute them with the cotlet_browser_* tools in the user's Patreon Cloud Browser. The named handoff to a sibling family is strong guidance. It does not state any when-not condition (e.g., when the tier does not exist or the user lacks a browser session), so it falls short of a 5.

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