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Cloudflare Playwright MCP

Cloudflare Playwright MCP

Official
by cloudflare
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Remote

browser_snapshot

Read-only

Capture an accessibility snapshot of any web page to analyze its structure and content. Supports targeting specific elements, setting depth limits, and including bounding boxes, providing a detailed alternative to screenshots.

Instructions

Capture accessibility snapshot of the current page, this is better than screenshot

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "browser_snapshot"
  }
}

Input Schema

NameRequiredDescriptionDefault
targetNoExact target element reference from the page snapshot, or a unique element selector
filenameNoSave snapshot to markdown file instead of returning it in the response.
depthNoLimit the depth of the snapshot tree
boxesNoInclude each element's bounding box as [box=x,y,width,height] in the snapshot

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed5 schema fields changedv0.0.5
    • changedInput schema / $schema
      Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"
    • addedInput schema / properties / boxes
      Added value: +{
+  "description": "Include each element's bounding box as [box=x,y,width,height] in the snapshot",
+  "type": "boolean"
+}
    • addedInput schema / properties / depth
      Added value: +{
+  "description": "Limit the depth of the snapshot tree",
+  "type": "number"
+}
    • addedInput schema / properties / filename
      Added value: +{
+  "description": "Save snapshot to markdown file instead of returning it in the response.",
+  "type": "string"
+}
    • addedInput schema / properties / target
      Added value: +{
+  "description": "Exact target element reference from the page snapshot, or a unique element selector",
+  "type": "string"
+}
  2. First observedv1.0.0

TDQS

A3.7/5.0
Behavior3/5

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

Annotations already mark the tool as read-only and non-destructive, which is consistent with the description. The description adds that it captures an accessibility snapshot, but does not detail what that entails or any behavioral quirks (e.g., whether it waits for page load, or the format of the snapshot).

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 sentence, concise and front-loaded with the key action. However, it is almost too brief and could be slightly expanded without losing conciseness.

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 the tool has four optional parameters and no output schema, the description is insufficient. It does not explain what an accessibility snapshot is, how target selection works, or what the return value looks like. The schema descriptions help but overall context is missing.

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?

Input schema has 100% description coverage, so the description does not need to add parameter semantics. It doesn't add any beyond the schema, which is acceptable per baseline.

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?

Description clearly states the tool captures an accessibility snapshot of the current page. It also distinguishes it from the sibling tool browser_take_screenshot by claiming superiority, making the purpose obvious and differentiated.

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?

The description implies this tool should be used instead of a screenshot for accessibility data. However, it does not explicitly state when not to use it or list alternatives beyond the single comparison.

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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