Execute Playwright code in the browser. This tool runs JavaScript code with access to a Playwright `page` object. The browser session persists across calls, so you can navigate, interact with elements, and extract data across multiple tool invocations. **Available in scope:** - `page` - The Pla...
Accepts freeform code/query input (code)
Part of the Playwright Stealth MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents invoke browser_execute to trigger processes or run actions in Playwright Stealth. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
browser_execute can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. Intercept enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
tools:
browser_execute:
rules:
- action: allow
rate_limit:
max: 10
window: 60
validate:
required_args: trueSee the full Playwright Stealth policy for all 6 tools.
Agents calling execute-class tools like browser_execute have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Execute risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.
browser_execute is one of the high-risk operations in Playwright Stealth. For the full severity-focused view — only the high-risk tools with their recommended policies — see the breakdown for this server, or browse all high-risk tools across every MCP server.
Execute Playwright code in the browser. This tool runs JavaScript code with access to a Playwright `page` object. The browser session persists across calls, so you can navigate, interact with elements, and extract data across multiple tool invocations. **Available in scope:** - `page` - The Playwright Page object with full API access **Example usage:** Navigate to a page: ```javascript await page.goto('https://example.com'); return await page.title(); ``` Click an element and wait: ```javascript await page.click('button.submit'); await page.waitForSelector('.success-message'); ``` Extract text content: ```javascript const items = await page.$$eval('.item', els => els.map(el => el.textContent)); return items; ``` Fill a form: ```javascript await page.fill('input[name="email"]', 'test@example.com'); await page.fill('input[name="password"]', 'secret'); await page.click('button[type="submit"]'); ``` **Returns:** - `success`: boolean indicating if execution succeeded - `result`: JSON stringified return value (if any) - `error`: error message (if failed) - `consoleOutput`: array of console messages from the page **Note:** When STEALTH_MODE=true, the browser includes anti-detection measures to help bypass bot protection.. It is categorised as a Execute tool in the Playwright Stealth MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Add a rule in your Intercept YAML policy under the tools section for browser_execute. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Playwright Stealth MCP server.
browser_execute is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the browser_execute rule in your Intercept policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the Intercept policy for browser_execute. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
browser_execute is provided by the Playwright Stealth MCP server (playwright-stealth-mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept