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crmmc

DrissionPage BetterMCP

by crmmc

element_clear

Clear the value of an input element using a locator or element ID.

Instructions

Clear the value of an input element. Provide locator or element_id.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
byNo
by_jsNo
tab_idNo
locatorNo
element_idNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

With no annotations, the description carries full burden for behavioral disclosure. It only says 'Clear the value' without mentioning whether this triggers DOM events, works on all input types, or what the state after clearing looks like. This is insufficient for a mutation tool.

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

Conciseness4/5

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

Extremely concise (single sentence). However, it sacrifices too much information for brevity. Structure is clean but content is too sparse.

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

Completeness2/5

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

Given 5 parameters and no schema descriptions, the description is incomplete. It does not explain the purpose of optional parameters like by_js or tab_id, nor does it mention output schema (which exists but is unaddressed).

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

Parameters2/5

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

Schema coverage is 0%, so description must compensate. It mentions 'locator or element_id' but ignores three other parameters (by, by_js, tab_id). The schema shows these exist but description adds no meaning for them.

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

Purpose4/5

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

The description clearly states the action (clear value of input element) and the resource (input element). However, it does not differentiate from sibling tools like element_find or element_get_text, which could confuse an agent about when to use this specific tool.

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

Usage Guidelines2/5

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

No guidance on when to use this tool versus alternatives (e.g., element_get_text to read, element_find to locate). The instruction 'Provide locator or element_id' is minimal and doesn't explain prerequisites or appropriate contexts.

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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