Loading ToolBench
Model Context Protocol server for Playwright browser automation and API testing
24 tools with mixed quality. Strengths: all tools have descriptions (10-200 chars, mostly adequate); input schemas present with type definitions for most parameters. Critical weaknesses: descriptions are often generic or lack actionable context (e.g., 'Navigate to a URL' for playwright_navigate); many tools lack parameter descriptions (e.g., playwright_close has empty required array but no param docs); no output schemas documented anywhere; error handling is absent from descriptions; tool names are inconsistent (playwright_* prefix is redundant; mixing verb_noun with resource_action patterns). HTTP request tools (GET/POST/PUT/PATCH/DELETE) are poorly scoped, no rate limiting, no auth validation, no response size caps. Codegen tools lack session lifecycle documentation. Per-tool average: 52/100.
Clear a code generation session without generating a test
End a code generation session and generate the test file
Get information about a code generation session
Click an element on the page
Close the browser and release all resources
Retrieve console logs from the browser with filtering options
Perform an HTTP DELETE request
HTTP request tools (GET/POST/PUT/PATCH/DELETE) lack security guardrails: no rate limiting, no response size caps, no auth validation, no URL allowlist. Bearer token parameter is exposed in logs. Agents can be tricked into exfiltrating data or DoS-ing services.
No output schemas documented for any tool. LLMs cannot plan downstream calls or extract required fields. E.g., what does start_codegen_session return? What fields does get_codegen_session expose?
playwright_close has empty required array and no parameter descriptions. Tool descriptions lack error guidance (e.g., what happens if browser is already closed? Can it be retried?). No recovery hints.
Inferred effective spec: <=2025-11-25.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | D | 52 | <=2025-11-25 | v2 |
Execute JavaScript in the browser console
fill out an input field
Perform an HTTP GET request
Get visible HTML content from the current page
Get visible text content from the current page
Hover an element on the page
Click an element in an iframe on the page
Fill an element in an iframe on the page
Navigate to a URL
Perform an HTTP PATCH request
Perform an HTTP POST request
Perform an HTTP PUT request
Resize the browser viewport using manual dimensions or device presets. Supports 143+ device presets including iPhone, iPad, Android devices, and desktop browsers with proper user-agent and touch emulation.
Take a screenshot of the current page or a specific element
Select an element on the page with Select tag
Upload a file to an input[type='file'] element on the page
Start a new code generation session to record Playwright actions
Tool naming is inconsistent and redundant. All tools prefixed with 'playwright_' (e.g., playwright_navigate, playwright_click) adds noise. Codegen tools use different naming (start_codegen_session vs playwright_*). LLMs struggle with inconsistent naming conventions.
Descriptions are generic and lack actionable context. E.g., 'Navigate to a URL' does not explain when to use it vs other navigation tools, what happens on timeout, or what state it leaves the browser in. Descriptions average 40-50 chars; production baseline is 194 chars.