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playwright-fixer-mcp

playwright-fixer-mcp

by BobChochola
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JavaScript
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Read page object selector definitions

read_page_object_selectors

Extract selector definitions from a page object file, mapping each getter to its exact CSS/attribute selector for diagnosing broken selectors. Returns raw content fallback if structured extraction fails.

Instructions

Extract all selector definitions from a page object file. Returns a getter → elementName → selector mapping so the model sees the exact CSS/attribute selectors in use — essential for diagnosing broken selectors without guessing. If structured extraction fails, returns the raw file content as fallback.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "pageObjectPath": "<pageObjectPath>"
    },
    "name": "read_page_object_selectors"
  }
}

Input Schema

NameRequiredDescriptionDefault
pageObjectPathYesAbsolute path to the page object file

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

A4.3/5.0
Behavior4/5

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

With no annotations provided, the description carries the full burden. It discloses the success output format and the fallback behavior when structured extraction fails. It does not mention error cases beyond the fallback, but for a read-only extraction tool this is substantial transparency.

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?

The description is two sentences, both information-dense. The first states the action and outcome, the second adds purpose and fallback. No redundant wording or filler.

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

Completeness5/5

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

For a simple one-parameter read tool with no output schema, the description is complete: it states what is extracted, the mapping format, the purpose, and the fallback if extraction fails. Nothing essential 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?

Schema description coverage is 100% for the single parameter, pageObjectPath, which is fully described as an absolute path. The description adds no additional parameter-specific information beyond the schema, so the baseline of 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 tool extracts all selector definitions from a page object file, with a specific verb and resource. It also describes the output mapping, distinguishing it from sibling tools like analyze_and_fix_selector by focusing on reading rather than modifying.

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 gives clear context for when to use this tool: 'essential for diagnosing broken selectors without guessing.' It does not explicitly name alternatives or exclusions, but the read-only nature and diagnostic purpose imply when it is appropriate.

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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