This server has significant structural issues that prevent a higher score. While all 12 tools have names, descriptions, and visible input schemas in src/tools.ts, most descriptions are too brief (median ~20 chars, well below the 194-char baseline for A+ tools). Parameter descriptions exist but are minimal and lack actionable detail. Most critically, there is NO DOCUMENTED OUTPUT SCHEMA for any tool, LLMs cannot reason about what these tools return, making composition and chaining unreliable. Error handling is not visible in the tool definitions. The naming convention is inconsistent (playwright_navigate vs playwright_click, inconsistent subject placement). Tools like playwright_evaluate and playwright_post expose dangerous capabilities (arbitrary JavaScript execution, HTTP requests) without safeguards or warnings. Most tools lack enum constraints on parameters that should have them (e.g., waitUntil in playwright_navigate could be an enum: 'load'|'domcontentloaded'|'networkidle'|'commit'). HTTP request tools (playwright_get/post/put/patch/delete) accept arbitrary URLs with no validation, rate limiting, or timeout documentation, creating potential for abuse. The server is STDIO-only, which caps protocol readiness at 50.
NO OUTPUT SCHEMAS DOCUMENTED for any tool. LLMs cannot reason about what fields to extract or pass to downstream tools. This breaks tool composition and chaining.
SECURITY: playwright_evaluate allows arbitrary JavaScript execution with no warnings, validation, or sandboxing guidance. This is extremely dangerous for agentic use.
SECURITY: HTTP request tools (playwright_get, playwright_post, playwright_put, playwright_patch, playwright_delete) accept arbitrary URLs with no validation, whitelist, or rate limiting. Agents could be tricked into exfiltrating data or attacking internal systems.
playwright_get
Recommendations
ADD OUTPUT SCHEMAS to every tool. Document what fields are returned and their types. Example for playwright_screenshot: {type: 'object', properties: {filename: {type: 'string'}, base64: {type: 'string'}, path: {type: 'string'}}, required: ['filename']}. This is CRITICAL for agent reasoning.
EXPAND ALL DESCRIPTIONS to 100-200 characters. Include WHEN to use the tool and WHAT it returns. Example: 'Navigate to a URL and wait for the page to load. Returns the page title and final URL. Use waitUntil=[load|domcontentloaded|networkidle|commit] to control when to consider navigation complete.'
ADD ENUM CONSTRAINTS to playwright_navigate's waitUntil param. Replace free-form string with enum: ['load', 'domcontentloaded', 'networkidle', 'commit'].
REMOVE or RESTRICT playwright_evaluate. If kept, require an explicit allow-list of safe script patterns or completely disable it. At minimum, add a CRITICAL WARNING in the description: 'Executes arbitrary JavaScript. Use only with trusted input. Agents can be tricked into malicious code execution.'
REPLACE generic HTTP request tools (playwright_get/post/put/patch/delete) with application-specific variants. Instead of 'post to any URL', create 'post_to_api' with a whitelist of allowed domains/endpoints. Or remove these tools entirely, they are a severe security risk in agentic contexts.
ADD DRY-RUN and CONFIRMATION mechanisms to playwright_delete. Require explicit confirmation before executing. Example: add a 'dry_run' parameter that returns what would be deleted without deleting.
DESIGN: playwright_delete is destructive but has no confirmation, dry-run, or undo mechanism. Agents can permanently delete resources without safeguards.
Descriptions are too brief (median ~20 chars, well below 194-char baseline). Most descriptions lack context on WHEN to use the tool or what it returns. This forces LLMs to guess.
Missing enum constraints where appropriate. playwright_navigate's 'waitUntil' param should be enum (load|domcontentloaded|networkidle|commit), not free-form string. This invites hallucinated values.
Copy-paste error: playwright_patch description says 'Data to PUT in the body' instead of 'Data to PATCH in the body'. Suggests lack of review and confuses LLM.
No error handling guidance in any tool description. LLMs don't know how to recover from failures (e.g., 'selector not found', 'timeout', 'network error').
Inconsistent naming: playwright_evaluate uses an underscore after playwright, but tools are named inconsistently in terms of semantic hierarchy. No clear verb_noun pattern (e.g., could be 'navigate_to_page', 'get_page_screenshot', 'click_element').
ADD PARAMETER DESCRIPTIONS with constraints. Example for playwright_screenshot's selector: 'CSS selector for element (e.g., button.submit, #email-input). Required only if taking element screenshot; omit for full-page.'
ADD ERROR HANDLING GUIDANCE to descriptions. Example: 'If selector is not found, returns error code NOT_FOUND. Verify the selector with playwright_screenshot first.'
FIX the copy-paste error in playwright_patch description. Change 'Data to PUT in the body' to 'Data to PATCH in the body'.
ADD TIMEOUT and RATE-LIMIT documentation. Example: 'HTTP requests timeout after 30 seconds. Rate limit: 10 requests per second per client. Retryable on timeout; non-idempotent operations may result in duplicates.'
STANDARDIZE parameter naming. Use consistent type suffixes: selector_string, viewport_width, navigation_timeout (instead of just 'timeout'). This reduces LLM confusion.
ADD INPUT VALIDATION EXAMPLES to parameter descriptions. Example for playwright_fill: 'Selector must be a valid CSS selector. Value must be a string (max 10000 chars). Returns error if field is disabled or read-only.'
DOCUMENT what happens on partial failures. Example for batch-like operations: 'If 5 of 10 clicks succeed, returns partial success with per-item status array, not a blanket error.'
ADD SECURITY WARNINGS. For any tool that modifies state or accesses external services, explicitly state: 'This tool modifies state / accesses external networks. Verify input to prevent unintended side effects.' Example: add to playwright_click, playwright_fill, playwright_delete.