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DanEvenSegler

Extended Playwright MCP Server

browser_get_attributes

Read-only

Fetch all HTML attributes of an element as a key-value dictionary using its snapshot ID or CSS selector.

Instructions

Returns all attributes of an HTML element as a key-value dictionary.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
targetYesTarget element reference (snapshot ID) or CSS selector.
Behavior3/5

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

The annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is known. The description adds the return format ('key-value dictionary') and scope ('all attributes'), but it does not disclose behavior for missing elements or whether it waits for the element.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, front-loaded sentence with no redundant wording. It conveys the essential information efficiently.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the low complexity (one parameter, read-only, good annotations), the description is largely complete. It could mention empty-result behavior or error handling, but that is a minor gap. The lack of usage guidance is a slight omission.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%: the single 'target' parameter is described as 'Target element reference (snapshot ID) or CSS selector.' The description adds no further parameter semantics beyond the schema, so the baseline of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Returns'), the resource ('all attributes of an HTML element'), and the output format ('key-value dictionary'). This specificity distinguishes it from sibling tools like browser_get_html or browser_get_element_state.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies use when element attributes are needed, but it does not explicitly state when to prefer this over alternatives like browser_get_element_state, nor does it mention any exclusions or prerequisites. Guidance is only implicit.

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

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