browser_act

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

Annotations already convey readOnly=false, openWorld=true, idempotent=false, and destructive=false, so the description need not restate those. It adds some useful behavioral context by saying 'one decided step' and 'current page,' but it still does not disclose what types of actions may occur, whether navigation or form submission may happen, or what the tool returns.

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 description is a single short sentence with no filler, and the key idea 'one decided step' is front-loaded. It is concise, though the phrasing 'towards an instruction' is slightly awkward and the sentence carries less useful content than it could.

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 general browser action tool, this description is not complete enough. It leaves unclear how to phrase instructions, what values means, what observable result the agent can expect, and how browser_act relates to the many specific sibling browser_* tools.

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 coverage is 0%, so the description must compensate for missing parameter documentation, but it does not explain the required 'instruction' beyond using the same word. It also says nothing about the optional 'values' object, which is opaque and could represent form values, options, or something else.

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 identifies the action as taking one step toward an instruction on the current page, so it communicates a general purpose rather than being a pure tautology. However, it is vague about what the step concretely does and does not distinguish browser_act from sibling tools like browser_click, browser_type, or browser_scroll.

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 guidance on when to use browser_act versus any of the specific sibling tools. The description only implies that the tool executes a single decided step, but it never says how to break down instructions, when a specific sibling should be preferred, or when browser_act should not be used.

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