uBrowser
Drive a browser from your agent without the token bloat. Batches navigate/click/type into one call, stays logged in with persistent sessions, and feeds the model compact DOM snapshots instead of giant HTML, so multi-step flows like logins, form-filling, and scraping behind auth stay fast and cheap. Runs on the uBrowser MCP server.
- Automate multi-step checkout and account management workflows.
- Scrape structured data from paginated results or dynamic JS sites.
- Test login and authentication flows with persistent session cookies.
$15
· or 75 creditsSecure checkout via Stripe
Included in download
- Scrape structured data from paginated results or dynamic JS sites.
- Test login and authentication flows with persistent session cookies.
- terminal, file_read, file_write automation included
- Includes example output and usage patterns
Sample input
Navigate to the billing page on https://app.example.com and update the card on file. Ensure the session stays active and report any receipt info and network status.
Sample output
uBrowser Results
- Target: https://app.example.com
- Elapsed: 12.4s
- Batch calls: 1
- Session: persisted
- Steps:
- PASS: Navigated to /billing
- PASS: Updated card on file
- Extraction:
- 1 receipt found
- Network:
- 200 OK /api/v1/billing
- Evidence: Final URL: https://app.example.com/billing/success
Drive a browser from your agent without the token bloat. Batches navigate/click/type into one call, stays logged in with persistent sessions, and feeds the model compact DOM snapshots instead of giant HTML, so multi-step flows like logins, form-filling, and scraping behind auth stay fast and cheap. Runs on the uBrowser MCP server.
$15
· or 75 creditsSecure checkout via Stripe
Also available in a bundle
Included in download
- Scrape structured data from paginated results or dynamic JS sites.
- Test login and authentication flows with persistent session cookies.
- terminal, file_read, file_write automation included
- Includes example output and usage patterns
- Instant install
Sample input
Navigate to the billing page on https://app.example.com and update the card on file. Ensure the session stays active and report any receipt info and network status.
Sample output
uBrowser Results
- Target: https://app.example.com
- Elapsed: 12.4s
- Batch calls: 1
- Session: persisted
- Steps:
- PASS: Navigated to /billing
- PASS: Updated card on file
- Extraction:
- 1 receipt found
- Network:
- 200 OK /api/v1/billing
- Evidence: Final URL: https://app.example.com/billing/success
About This Skill
Fast, Low-Token Browser Automation
uBrowser is a high-performance automation skill designed for developers who need to control web browsers without the token bloat of standard LLM-web interactions. It solves the "chatty" nature of AI automation by batching multiple actions—like navigating, typing, and clicking—into a single execution window, significantly reducing latency and cost.
What it does
Instead of the AI thinking after every single click, uBrowser allows for browser_batch execution. It handles complex multi-step workflows like logging into dashboards, filling out multi-page forms, and scraping data behind authentication walls. It uses compact snapshots to provide the AI with a lightweight representation of the DOM, focusing only on interactive elements to stay within context limits.
Supported Capabilities
- Persistent Sessions: Maintain logins across different runs using local profile directories.
- Network/Console Inspection: Debug AJAX failures and JS errors directly from the agent.
- Intelligent Extraction: Pull structured data, tables, and links into clean JSON formats.
- Compact Snapshots: 70% smaller payloads compared to full DOM traces.
Why it's better than standard prompting
Most AI agents fail at web tasks because they get lost in large HTML files or run out of tokens during long flows. uBrowser provides a specialized MCP layer that optimizes the "vision" of the AI, making it faster, cheaper, and far more reliable for production-grade scraping and testing.
Use Cases
- Automate multi-step checkout and account management workflows.
- Scrape structured data from paginated results or dynamic JS sites.
- Test login and authentication flows with persistent session cookies.
- Debug web apps by inspecting network requests and console logs.
- Fill and submit complex multi-page forms with a single batched command.
Known Limitations
Requires uBrowser MCP server pre-installed. Session persistence works across same-domain sites. Complex JavaScript-heavy sites may need explicit wait commands. Does not support mobile app testing (web only).
How to Install
mkdir -p ~/.claude/skills && curl -sL https://www.agensi.io/api/install/ubrowser -o /tmp/ubrowser.zip && unzip -o /tmp/ubrowser.zip -d ~/.claude/skills && rm /tmp/ubrowser.zipFree skills install directly. Paid skills require purchase - use the download button above after buying.
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Security Scanned
Passed automated security review
Permissions
File Scopes
uBrowser needs terminal access to start the uBrowser MCP server and run browser automation commands. All browser operations (navigate, click, type) are executed through the MCP server, not directly by the skill. File read access allows the skill to load automation templates and saved session profiles. File write access saves session data (cookies, localStorage) between runs so you stay logged in across sessions. All file writes are disclosed to the user. Network access is handled by the uBrowser MCP server, which connects to target websites. The skill itself makes no direct network calls. No environment variable access is required.
Works with Claude Code and Codex. Requires uBrowser MCP server installed (`npx uBrowser` or via cc-switch). Node.js 18+ required. Session persistence keeps you logged in across sessions.
Creator
JustHandled Labs builds focused agent skills for the work nobody wants to do by hand. Each one is a single repeatable job done well: catching the security and data mistakes that quietly ship, keeping docs and tests honest, gating the commands an agent is about to run, sharpening writing, and handling the founder chores around launches, outreach, and brand setup. Not generic AI productivity. Specific workflows that are easy to run, review, and repeat. Maintained by H.J. Westerfield, with a background in communications, editing, project coordination, customer support, and practical AI systems. Tools for people who want useful automation without theatrical complexity.
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