The Tool Desk
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Build the workflow as two separate steps
- Navigate and verify: have the agent open the requested URL, then check that the browser reached the intended page. A successful navigation call alone does not prove that every dynamic element has finished rendering.
- Choose what to capture: use a viewport screenshot for the visible state, an element screenshot for a specific component, or a full-page screenshot for the scrollable document.
- Read the final URL: after redirects or interactions, use the browser’s current URL rather than assuming it still matches the originally requested URL.
- Derive a filename: parse the URL and apply your own sanitizing and collision rules.
- Save deliberately: pass an explicit path to the screenshot operation, with an extension matching the desired image type.
Microsoft Playwright documents navigation and named output through the Page API, and capture controls through its CLI and MCP tools.
Derive a filename from the current page URL
Use a URL parser, not string splitting. A useful default is hostname plus pathname, excluding query parameters and fragments: they often contain tracking, session, or personal values and are usually poor filename material. Replace filesystem-hostile characters, normalize repeated separators, trim punctuation at the ends, and cap the result length.
For example, https://docs.example.org/guides/page?campaign=spring#steps could produce docs-example-org_guides_page.png. This is an illustrative naming convention, not a built-in Playwright transformation. If query parameters represent meaningful states in your application, include only an allowlisted subset.
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Different URLs can normalize to the same name. Decide whether to overwrite, reject the collision, or append a deterministic short suffix, such as a hash of the full URL. Use a known output directory and create it before capture; do not assume that a relative path resolves to the same place across interfaces.
Runnable Playwright API example
This Node.js example uses Playwright’s Page API. It navigates to a URL, derives a conservative name from the final browser URL, creates an output directory, and saves a full-page PNG. Install Playwright and its browser for your project before running it.
import { chromium } from 'playwright';
import { mkdir } from 'node:fs/promises';
import path from 'node:path';
function filenameFromUrl(rawUrl) {
const url = new URL(rawUrl);
const source = `${url.hostname}${url.pathname}`;
const safe = source
.replace(/[^a-zA-Z0-9._-]+/g, '_')
.replace(/_+/g, '_')
.replace(/^[._-]+|[._-]+$/g, '')
.slice(0, 160);
return `${safe || 'page'}.png`;
}
const target = process.argv[2];
if (!target) throw new Error('Usage: node capture.mjs https://example.com');
const browser = await chromium.launch();
try {
const page = await browser.newPage();
await page.goto(target);
// Add a task-specific readiness check here if the page renders asynchronously.
const finalUrl = page.url();
const outputDir = path.resolve('screenshots');
await mkdir(outputDir, { recursive: true });
const outputPath = path.join(outputDir, filenameFromUrl(finalUrl));
await page.screenshot({ path: outputPath, fullPage: true });
console.log(`Saved ${outputPath} for ${finalUrl}`);
} finally {
await browser.close();
}This example intentionally omits query strings and fragments, but its simple normalization does not resolve filename collisions. Add a stable suffix or explicit overwrite policy if multiple pages may map to the same path. Playwright’s Page API resolves a relative screenshot path against the process’s current working directory.
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Choose capture scope, format, and resolution
- Viewport: captures the visible browser area. Use it for a particular on-screen state or when consistent dimensions matter.
- Element: target a locator or element when the artifact should contain only a component, such as a form. The Page API, CLI, and MCP documentation describe element capture.
- Full page: captures the scrollable page. The CLI option is
--full-page; MCP usesfullPage; the API exposes a full-page option. - Image type: PNG, JPEG, and WebP are documented for the CLI/MCP interfaces. The API infers the type from the filename extension. Where a type is not specified, the CLI and MCP documentation describe PNG as the default.
- Resolution: the CLI offers a high-resolution option; MCP provides
scalechoices for CSS-pixel or device-pixel sizing. Device-pixel output can help preserve legibility, but may produce larger files.
Keep the extension aligned with the selected image type. An explicit name also avoids relying on generated timestamped names: the CLI documents --filename, MCP accepts filename, and the Page API accepts path.
Use the interface that fits the agent
| Interface | How the agent invokes capture | Named output and path behavior | Useful distinction |
|---|---|---|---|
| Playwright Page API | Programmatic browser code | path; relative paths resolve from the current working directory |
Best when application code needs to parse the final URL and enforce its own naming policy. |
| Playwright CLI | Shell command | --filename; documented defaults use timestamped page-... names |
Offers viewport/full-page controls and a high-resolution option. |
| Playwright MCP | MCP tool called by an AI agent | filename; relative names resolve from the workspace root |
Can target the current page or a specific element; exposes fullPage and scale choices. |
For an agent already using Playwright MCP, derive the name in the surrounding application or agent workflow and pass it as the tool’s filename. Do not assume that an MCP-relative path uses the same base directory as an API-relative path.
Handle dynamic pages and verify the result
There is no single readiness wait that is correct for every site. After navigation, choose a condition tied to the page and the artifact: wait for a known selector, a task-relevant element to become visible, or an application-specific state. Then inspect the saved image for missing content, overlays, or an incorrect scroll range. Avoid treating “navigation returned” as proof that animations, lazy images, or asynchronous content have settled.
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- For a page that loads a key component asynchronously, wait for that component rather than an arbitrary long delay.
- For lazy-loaded images in a full-page capture, confirm that they were loaded before treating the image as complete.
- For a screenshot after clicks or form changes, capture only after the intended interaction has taken effect.
Troubleshoot common filename and capture problems
The screenshot is saved in an unexpected directory
Check the execution interface and its working root. A Page API relative path is resolved from the current working directory; an MCP relative filename is resolved from the workspace root. Use an explicit absolute output directory when the workflow needs a predictable location.
The name contains invalid characters or private values
Do not copy the raw URL into a path. Parse it, omit the query and fragment by default, replace unsupported characters, and cap the length. If a query parameter is necessary to distinguish a state, allowlist that parameter and avoid sensitive values.
One screenshot replaces another
Two URLs may collapse to the same sanitized name, or a repeated capture may reuse the same URL. Set an explicit overwrite policy or append a deterministic suffix based on the source URL.
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The image is blank, incomplete, or shows the wrong state
Confirm the final URL and the expected page state, add a task-specific readiness condition, and inspect whether the chosen scope was viewport, element, or full page. A returned navigation call does not establish that dynamic content has finished rendering.
The image type does not match the file
For the API, use a filename extension that matches the intended format because the type is inferred from it. In CLI/MCP usage, specify the supported type where needed and do not rely on an undocumented default.
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Frequently Asked Questions
Does Playwright automatically create a filename from a page URL?
No. The documented screenshot interfaces accept an explicit output name or path; parsing and sanitizing a URL into that name is application logic.
Should I include URL query parameters in screenshot filenames?
Usually not. Exclude them unless an allowlisted parameter identifies a meaningful page state, and never expose sensitive values in shared filenames.
Which screenshot scope should an AI agent use?
Use viewport for the visible browser state, an element for a specific component, and full-page for the scrollable document.
Quick Recap
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