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dgutierrez1

concurrent-playwright-mcp

by dgutierrez1

Wait for selector

browser_wait_for

Wait until a CSS selector reaches a specified state (attached, detached, visible, hidden) in an isolated browser session.

Instructions

Wait until a CSS selector reaches a state.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
stateNovisible
timeoutNoTimeout in milliseconds
selectorYesCSS selector to wait for
sessionIdYesId of the isolated browser session
Behavior2/5

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

No annotations are provided, so the description must carry the full burden. It fails to disclose behavioral traits such as timeout behavior, polling interval, or side effects, only restating the basic action.

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 concise and front-loaded, but it is very short; a bit more detail would improve without adding verbosity.

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 annotations and no output schema, the description is insufficient. It does not explain return values, error handling, or behavior on timeout, leaving significant gaps.

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 75% with parameter descriptions, and the tool description adds no extra meaning beyond the basic action. Baseline 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 (wait) on a specific resource (CSS selector) to reach a state, distinguishing it from sibling tools like browser_click or browser_navigate.

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 usage for waiting on selector states but does not explicitly state when to use or avoid this tool, nor does it mention alternatives.

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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