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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so safety is largely covered. The description adds non-obvious behavior beyond that: the tool performs no action itself, returns step-by-step instructions with screens/buttons/fields, and requires browser tools to actually complete the task. That is genuinely useful disclosure that the annotations cannot convey.

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 behavioral statement is front-loaded and useful, but the trailing API paragraph ('official API: Yes... no official MCP server (checked 6 Nov 2026)') is tangential to invoking this tool and adds a dated claim that will age badly. The second sentence also crams return value, side-effect absence, and follow-up tooling into one long clause.

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?

With no parameters and no output schema, the description carries the burden of explaining the return value, and it does: step-by-step instructions covering screens, buttons, and fields. It also explains the required follow-up with browser tools. What is missing is how the instruction payload is structured or scoped to the Inbox specifically.

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 schema is a closed empty object, so there is nothing for the description to clarify about inputs. Baseline 4 applies for a parameterless tool.

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 first sentence claims the tool 'lists Inbox tasks', but the second sentence reveals it actually 'returns how to do it in Amazing Marvin step by step' and 'opens nothing by itself'. That tension between the named action and the real behavior leaves an agent unsure whether calling it yields tasks or instructions. The resource and app are clearly identified, but the verb is muddled.

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 give a usable workflow: call this, then perform the action with the cotlet_browser_* tools in the Cloud Browser. That is real guidance for the follow-up step. However, it never says when to choose this over the sibling list tools (e.g. amazing_marvin_list_tasks_due_by_a_date or amazing_marvin_list_tasks_for_a_day), so selection guidance is incomplete.

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