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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=true, so the agent knows this mutates state and reaches an external browser. The description usefully adds that the initial accessible snapshot is returned, but says nothing about permissions, session lifetime, or cleanup expectations, so it adds only moderate value on top of the annotations.

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?

A single front-loaded sentence with no filler; the action and its return value are stated immediately, which is exactly the right size for this 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?

Because an output schema exists, the return snapshot need not be explained further. However, for a tool with two undocumented required parameters and no guidance on its role in the demo workflow, the description leaves meaningful gaps.

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?

Schema description coverage is 0% and both required parameters (task, start_url) carry no titles beyond their names and no descriptions. The description does not explain what 'task' means (a goal string? an ID?) or the required URL format, so it fails to compensate for the coverage gap.

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 pairs a specific verb (start) with a resource (browser session) and even states what is returned, the initial accessible snapshot. It is clear enough to separate from terminal siblings like finish_demo or get_demo_status, but it never names a sibling or scope boundary, so it stops short of full differentiation.

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?

There is no statement of when this should be used versus the ~20 sibling tools, nor any prerequisite or lifecycle note (e.g., that it is the entry point before navigate_browser/click_element). Usage is only implied by the verb 'start'.

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