Do the PDFs being merged have to be publicly reachable?

Yes. Merge multiple PDFs into one takes URLs and every one of them must be publicly accessible, so a file behind a login or an expired signed URL has to be exposed or fetched another way first. The pages come out in the order the URLs were passed.

What styling survives the HTML to PDF conversion?

Inline CSS does: colours, fonts, tables, borders and backgrounds, plus Unicode characters and special symbols, across complete documents or fragments and over multiple pages. The action returns raw PDF bytes, so decide where the file is stored rather than expecting a hosted link back.

What does a Puppeteer script have access to?

A sandboxed headless browser with a page object, which the script drives to navigate URLs, interact with elements or extract data, and it captures a screenshot as it completes. That screenshot doubles as a visual check on whether the page rendered the way you expected.

Can Lyro run our own CustomJS functions or send mail through it?

No. This toolkit covers HTML to PDF, HTML to PNG, PDF merging, a Puppeteer script and API key validation. Your own deployed CustomJS automations, transactional email and CRM field updates are not exposed here, so they stay inside CustomJS itself.

Customjs MCP integration

Renders HTML into PDF or PNG, merges PDFs from public URLs, and drives a sandboxed headless Puppeteer script.

Connect Customjs See all integrations

5actions available

Three actions you can hand over today

Every action runs live through MCP. Nothing to build, nothing to maintain.

Merge multiple pdfs into one
Lyro merges multiple PDF files from URLs into a single PDF document. Support agents combine customer documents and send comprehensive packages instantly.
Run puppeteer script
Lyro executes a Puppeteer script in a headless browser and captures a screenshot. Agents automate web scraping and testing tasks mid-conversation.
Convert HTML to PDF
Lyro converts HTML content to a PDF document. Support agents instantly generate reports and documentation for customers.

See all 5 actions

How businesses use Customjs + Lyro

Each card is one request a support team gets, and the Customjs actions Lyro runs to close it.

Produce the document the customer asked for
Lyro renders HTML with inline CSS, tables and Unicode into PDF bytes or a PNG image, and merges several PDFs from public URLs in the order given when a document and its attachments belong in one file.
Convert HTML To PDFConvert HTML To PNGMerge Multiple PDFs Into One
Check the workspace before spending a request
Lyro validates the API key and reads back the workspace details and request limits, then runs a Puppeteer script in the sandboxed headless browser to navigate, interact with elements or capture a screenshot.
Authenticate CustomJS API KeyRun Puppeteer Script

How it works

Get started in 3 steps

Connect once, then just ask. There is no workflow builder to learn and nothing to maintain — Lyro reads the Customjs actions it has and picks the ones a request needs.

01
Connect Customjs
Authorize the Customjs account your team already uses — one consent screen, no API keys, no mapping tables. Lyro can only do what you granted that account, and you can disconnect it at any time.
02
Tell your agent what you need
Describe the job the way you would hand it to a teammate. Lyro maps it to the Customjs actions that close it and chains as many as the request needs.
03
Watch it work
The agent runs the actions inside the conversation the customer is already in, so nobody copies data between tabs and your team can take over at any point.
Get started free

Customjs · Lyro

Everything else about Customjs

Setup, permissions, and the limits of what Lyro can do inside Customjs.

Yes. Merge multiple PDFs into one takes URLs and every one of them must be publicly accessible, so a file behind a login or an expired signed URL has to be exposed or fetched another way first. The pages come out in the order the URLs were passed.

Every action available in Customjs

All 5 actions your agent can call on Customjs, straight from the live MCP connection.

Authenticate customjs API key
Authenticate and validate a CustomJS API key.
Convert HTML to PDF
Convert HTML content to a PDF document.
Convert HTML to png
Convert HTML string to PNG image.
Merge multiple pdfs into one
Merge multiple PDF files from URLs into a single PDF document.
Run puppeteer script
Execute a Puppeteer script in a headless browser and capture a screenshot.