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

Annotations already declare readOnlyHint=true, destructiveHint=false and idempotentHint=true; the description reinforces this by stating it "opens nothing by itself," which resolves the tension between the name "cancel_order" and the read-only annotation. It also discloses the shape of the return (step-by-step screens, buttons, fields). The trailing note about Printful's REST API and absence of an official MCP server adds little behavioral value for invocation.

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 critical clarification (that nothing is actually cancelled) is deferred to the second sentence behind a misleading opener. The final sentence about developers.printful.com, private tokens, OAuth and an MCP-server audit date is tangential boilerplate that does not help an agent decide or call the tool.

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 it returns and what the agent should do next, which is the necessary information. The only shortfall is the absence of any stated preconditions or failure modes, which is minor at this complexity.

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 no parameters, so the schema carries the full burden and the baseline is 4. There is no parameter meaning the description could or should add.

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 second sentence is precise: it "Returns how to do it in Printful step by step (screens, buttons, fields) and opens nothing by itself," which distinguishes it as an instruction-producing tool rather than an executor, and it names the cotlet_browser_* tools as the actual actors. The opening sentence ("Cancel order in the user's own Printful account") reads like the tool performs the cancellation, so an agent skimming the first line could misclassify 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 gives an explicit two-step workflow: call this to get the screens/buttons/fields, then carry out the cancellation with cotlet_browser_* in the user's Printful Cloud Browser. It does not state when to skip this tool and go straight to the browser tools, but the sequencing is clear enough to act on.

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