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freema

Firefox DevTools MCP

by freema

drag_by_uid_to_uid

Drag a source element to a target element using HTML5 drag events. Specify element UIDs to trigger the drag operation.

Instructions

Drag element to another (HTML5 drag events).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
fromUidYesSource element UID
toUidYesTarget element UID
Behavior2/5

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

No annotations are provided, so the description must disclose behavioral traits. It mentions 'HTML5 drag events' but fails to detail success/failure behavior, wait conditions, or side effects. This is insufficient for a drag operation.

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?

The description is a single, clear sentence without extraneous text. However, it lacks structural elements like bullet points or sections. It is efficient but could be slightly more structured.

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 no output schema or annotations, the description is incomplete. It does not explain return values, error conditions, or prerequisites like the element needing to be draggable. More context is required for effective use.

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 description coverage is 100% with basic descriptions for both parameters ('Source element UID', 'Target element UID'). The description adds no extra meaning beyond the schema, so baseline score of 3 is appropriate.

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 'Drag element to another (HTML5 drag events)' clearly specifies the action (drag) and resource (element to another), distinguishing it from sibling tools like click_by_uid or hover_by_uid. However, it does not explicitly contrast with other drag-related tools if any exist.

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?

The description provides no guidance on when to use this tool versus alternatives, such as hover_by_uid or click_by_uid. No prerequisites or context are mentioned, leaving the agent to infer usage without support.

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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