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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds genuine value beyond that by explaining the tool returns instructions only ("opens nothing by itself") and naming the fields it returns (screens, buttons, fields), which prevents a misread of the tool as a write. It does not say whether the guide is app-specific or ticket-specific, which is the main unresolved behavioral question.

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 clarification lands early, which is good. But the first sentence is padded with "from ChatGPT, Claude or any AI agent," and the closing line about Zammad's official REST API and "checked 22 Oct 2026" is background that does not change how the tool is invoked. Roughly a sentence of the four does no work.

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 guide tool with no output schema, the description covers the important points: no side effects, the shape of what comes back, and the browser follow-up. What is missing is any statement that the guide is generic rather than scoped to a particular ticket, which an agent could otherwise assume.

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 baseline is 4 and nothing in the description contradicts or needs to compensate for the schema. The one gap is that the absence of arguments is not acknowledged — the agent is never told it cannot target a specific ticket — but with an empty schema this is a minor omission.

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 gives a specific verb and resource ("Add internal note in the user's own Zammad account") and then clarifies the actual mechanic: it "Returns how to do it in Zammad step by step (screens, buttons, fields) and opens nothing by itself." That reframing is essential because the name reads like a mutation. It does not distinguish itself from sibling zammad_reply_to_customer (customer-visible) or cotlet_app_guide (generic guide), leaving some ambiguity about which to pick.

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?

The description does route the agent forward: "then do it with the cotlet_browser_* tools in the user's Zammad Cloud Browser," which is real workflow guidance. However, it never states when this tool is the right choice versus cotlet_app_guide or the other zammad_* tools, and gives no exclusion such as when a direct API tool already handles the action. Usage is implied rather than stated.

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