ReMCP

Computer Add To Selection

computer_add_to_selection

Destructive

Use this to add an identified native list or tree item to an existing multi-selection without replacing the other selected items. Confirm the target and current selection first.

Input Schema

Name	Required	Description
`x`	No	Virtual-desktop X coordinate used by click/scroll coordinate targeting.
`y`	No	Virtual-desktop Y coordinate used by click/scroll coordinate targeting.
`id`	No	Element id returned by ui_snapshot or ui_find. Linux ids are stable per-process accessibility paths and legacy linux:<index> ids remain accepted.
`app`	No	Limit matching to an application/process name substring when available.
`pid`	No	Limit matching to one owning process id when available.
`name`	No	Accessible name/title substring.
`role`	No	Accessible role such as Button, Edit, textbox or AXButton.
`label`	No	Compact numeric label from the most recent ui_snapshot/ui_find; useful for repeated actions without repeating names or coordinates.
`title`	No	Optional browser page title substring or top-level window title when target=window.
`value`	No	New value for set_value, set_range_value, or select.
`device`	Yes	ReMCP device id returned by list_devices. Required for every device operation.
`target`	No	Optional target type. auto prefers native accessibility, then browser DOM/CDP, then OCR/coordinates where supported. Use window for explicit top-level window focus/text/scroll targeting.
`ocr_text`	No	Visible text to find in rendered pixels for the OCR click fallback.
`selector`	No	CSS selector when the fallback target is a browser element.
`window_id`	No	Top-level window id returned by list_windows when target=window.
`browser_text`	No	Visible browser text used only to locate a DOM target; for action=type, text remains the value to enter.
`window_title`	No	Limit matching to a top-level accessibility window/frame title substring when available.
`automation_id`	No	Windows AutomationId when available.

Output Schema

Name	Required	Description	Default
`data`	No	Computer action structured result for computer_action. Stable fields are declared explicitly; platform-specific fields may be added. Large results may return truncated/bytes/preview instead of the full payload.
`text`	Yes	Concise human-readable result of the tool call.

Schema Changelog

Changes observed during successful MCP inspections.

AddedOct 19, 2026

TDQS

A4/5.0

Behavior4/5

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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=true, so the safety profile is covered. The description adds real behavioral context beyond that: the operation is additive rather than replacing, and it should be preceded by confirming the target and current selection. It omits what happens on duplicate/already-selected items or failure modes.

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?

Two tight sentences with zero waste: the additive semantics come first, then the precondition. Nothing is repeated from the title or schema.

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?

For an 18-parameter tool, the schema and output schema cover targeting and return values, and annotations cover safety, so the description's job is the selection semantics — which it does well. It could have clarified that it applies to native accessibility targets rather than browser/OCR paths, given the many targeting options.

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% across 18 parameters, so the schema carries the parameter burden and baseline is 3. The description only loosely gestures at identification ("identified ... item") and target confirmation, adding nothing about the id/label/target fields or the coordinate/OCR fallbacks.

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?

States a specific verb and resource ("add an identified native list or tree item") plus the key effect ("to an existing multi-selection without replacing the other selected items"). That additive semantics implicitly separates it from computer_select and computer_multi_select, though neither sibling is named.

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

Usage Guidelines4/5

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

"Use this to add ... without replacing the other selected items" gives clear selection context and a prerequisite ("Confirm the target and current selection first"). It stops short of naming the alternative tools or stating when not to use it.

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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