# browser_run_code A execute tool on the Playwright MCP MCP server. Agent View of the PolicyLayer registry record for `browser_run_code`. HTML page: https://policylayer.com/tools/alialobidm-playwright-mcp/browser-run-code ## Facts - Tool: `browser_run_code` - Server: Playwright MCP (`alialobidm/playwright-mcp`) — https://policylayer.com/tools/alialobidm-playwright-mcp.md - Homepage: https://github.com/alialobidm/playwright-mcp - Risk category: Execute (High risk) - Registry record: grade F, identity unverified - Server rate-limited: no - Parameters: 0 - Recommended policy verdict: Rate-limited ## Example call (MCP tools/call, JSON-RPC 2.0) ```json { "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "browser_run_code", "arguments": {} } } ``` ## Why browser_run_code is rated High A tool that runs code ('browser_run_code') in a browser context can execute arbitrary JavaScript, access DOM, trigger network requests, steal cookies/credentials, inject malware, or perform any action the browser permits. This is Execute rather than Write because its effects are not limited to data modification—they depend entirely on the code argument and can trigger arbitrary side effects. From the tool's own definition: "Tool name 'browser_run_code' indicates execution of arbitrary code in browser context. Description is empty, but the name combined with sibling tools like 'browser_evaluate' and the server's stated capability to 'interact with web pages' and 'execute'…" ## Use case AI agents invoke browser_run_code to trigger actions in Playwright MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started. ## Recommended policy (PolicyLayer) Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Playwright MCP: ```json { "version": "1", "default": "deny", "tools": { "browser_run_code": { "limits": [ { "counter": "browser_run_code_rate", "window": "minute", "max": 10, "scope": "grant" } ] } } } ``` ## Other tools on Playwright MCP (58) - `browser_cookie_clear` — Destructive — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-cookie-clear.md - `browser_cookie_delete` — Destructive — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-cookie-delete.md - `browser_localstorage_clear` — Destructive — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-localstorage-clear.md - `browser_localstorage_delete` — Destructive — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-localstorage-delete.md - `browser_sessionstorage_clear` — Destructive — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-sessionstorage-clear.md - `browser_sessionstorage_delete` — Destructive — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-sessionstorage-delete.md - `browser_click` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-click.md - `browser_close` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-close.md - `browser_drag` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-drag.md - `browser_evaluate` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-evaluate.md - `browser_file_upload` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-file-upload.md - `browser_fill_form` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-fill-form.md - `browser_handle_dialog` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-handle-dialog.md - `browser_hover` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-hover.md - `browser_install` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-install.md - `browser_mouse_click_xy` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-mouse-click-xy.md - `browser_mouse_down` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-mouse-down.md - `browser_mouse_drag_xy` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-mouse-drag-xy.md - `browser_mouse_move_xy` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-mouse-move-xy.md - `browser_mouse_up` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-mouse-up.md - `browser_mouse_wheel` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-mouse-wheel.md - `browser_navigate` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-navigate.md - `browser_navigate_back` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-navigate-back.md - `browser_press_key` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-press-key.md - `browser_resize` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-resize.md - `browser_route` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-route.md - `browser_select_option` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-select-option.md - `browser_start_tracing` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-start-tracing.md - `browser_start_video` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-start-video.md - `browser_stop_tracing` — Execute — https://policylayer.com/tools/alialobidm-playwright-mcp/browser-stop-tracing.md - …and 28 more: https://policylayer.com/tools/alialobidm-playwright-mcp.md ## For agents This record is a snapshot. Live verdicts and the full registry: - Check every server in your MCP config at once: `npx -y policylayer stack` - Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md) - Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events` --- Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=alialobidm-playwright-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/alialobidm-playwright-mcp