PDF Blocks for AI agents

PDF Blocks offers synchronous APIs for merging, splitting, watermarking, and securing PDF documents. Developers use it to build document assembly steps into their applications. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect PDF Blocks See the 17 actions ↓

DocumentsAPI keyMCP + RESTpdfblocks.com

AUDIT LOG · PDF BLOCKSPOLICY: acme-support

09:41:07 · claude · u_8f2read

pdf_blocks.extract_pages

Extract PDF Pages✓ allowed · 212ms

09:41:09 · claude · u_8f2write

pdf_blocks.add_password

Add PDF Password✓ approved · approved by user

09:41:12 · claude · u_8f2destructive

pdf_blocks.remove_pages

Remove PDF Pages✕ blocked · policy: deny

EVERY PDF BLOCKS CALL, ON THE RECORD

01 · USE CASES

What agents do in PDF Blocks.

Merge multiple PDFs into one

Combine several PDF files into a single document ready to send to a client.

Add a password to a PDF

Secure a sensitive PDF with a password before sharing it externally.

Remove pages with approval

Delete pages from a PDF only after confirming which pages are no longer needed.

02 · ACTIONS

17 PDF Blocks actions, graded by risk.

Every PDF Blocks action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

Look things up. Allowed by default.

pdf_blocks.extract_pages
Extract PDF Pages

write

Create and change things. Allow, or ask the user first.

pdf_blocks.add_password
Add PDF Password
pdf_blocks.add_restrictions
Add PDF Restrictions
pdf_blocks.add_text_watermark
Add Text Watermark
pdf_blocks.add_image_watermark
Add Image Watermark
pdf_blocks.rotate_pages
Rotate PDF Pages
pdf_blocks.reorder_pages
Reorder PDF Pages
pdf_blocks.reverse_pages
Reverse PDF Pages
pdf_blocks.split_pdf_at_page
Split PDF at Page
pdf_blocks.split_pdf_by_size
Split PDF by Size
pdf_blocks.split_pdf_by_page_count
Split PDF by Page Count
pdf_blocks.split_pdf_by_page_groups
Split PDF by Page Groups

destructive

Delete, cancel or archive. Ask first, or deny outright.

pdf_blocks.remove_pages
Remove PDF Pages
pdf_blocks.remove_password
Remove PDF Password
pdf_blocks.remove_signatures
Remove PDF Signatures
pdf_blocks.remove_restrictions
Remove PDF Restrictions
pdf_blocks.merge_pdfs
Merge PDFs

03 · HOW IT WORKS

PDF Blocks in three steps.

01Your users connect PDF BlocksThey add their PDF Blocks api key on Arc0 Connect, under your brand. It goes straight into the vault.
02You set the rulesReads run, writes like “add PDF Password” can wait for the user, and “remove PDF Pages” can be denied outright.
03Any agent can actYour agent calls PDF Blocks through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.

POLICY.TS

await arc0.policies.set('pdf_blocks', {
  read: 'allow',
  write: 'ask',        // add_password
  destructive: 'deny',  // remove_pages
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2

04 · AUTH AND DATA

How PDF Blocks connects.

Users add their PDF Blocks api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same PDF Blocks connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH: API key
CREDENTIALS: Per-tenant encrypted vault
MODEL SEES: Results only, never credentials
AUDIT LOG: Every call, on every plan

05 · WORKS WITH

Use PDF Blocks from any agent.

Claude

ChatGPT

Cursor

Codex

VS Code

OpenAI Agents SDK

Claude Agent SDK

Vercel AI SDK

Mastra

LangGraph

06 · RELATED

PDF Blocks and Arc0, answered.

Q01

Can I use PDF Blocks with Claude, ChatGPT or Cursor?

Yes. Connect PDF Blocks to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the PDF Blocks actions you allow.

Q02

How do users connect PDF Blocks?

Users add their PDF Blocks api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which PDF Blocks actions can my agent take?

17 in total: 1 read, 11 write and 5 destructive, such as “add PDF Password”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in PDF Blocks?

Yes. Actions like “remove PDF Pages” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call PDF Blocks too?

Yes. The same PDF Blocks connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug PDF Blocks into your agent.

Your users connect PDF Blocks once, under your brand. Your agent gets 17 actions behind your policies, with every call on the record.

Connect PDF Blocks Browse all apps →

Free to build · MCP + REST · Audit log on every plan