pdf_add_watermark

Add a text watermark to PDF pages. Watermark is centered and rotated diagonally by default. Applies to all pages if no page range is specified.

Accepts file system path (filePath)

Part of the Pdf Toolkit MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

@aryanbv/pdf-toolkit-mcp Write Risk 3/5

// WHEN AI AGENTS USE THIS TOOL

AI agents use pdf_add_watermark to create or modify resources in Pdf Toolkit. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.

// WHY ENFORCE A POLICY ON PDF_ADD_WATERMARK

Without a policy, an AI agent could call pdf_add_watermark repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Pdf Toolkit.

// RECOMMENDED POLICY

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

io-github-aryanbv-pdf-toolkit-mcp.yaml

tools:
  pdf_add_watermark:
    rules:
      - action: allow
        rate_limit:
          max: 30
          window: 60

See the full Pdf Toolkit policy for all 16 tools.

// DETAILS

Tool Name pdf_add_watermark

Category Write

MCP Server Pdf Toolkit MCP Server

Risk Level Medium

// MORE PDF TOOLKIT TOOLS

Write pdf_add_page_numbers Write pdf_create Write pdf_create_from_markdown Write pdf_create_from_template Write pdf_embed_image Write pdf_embed_qr_code Write pdf_encrypt Write pdf_fill_form

View all 16 tools →

// WHAT CAN GO WRONG

Agents calling write-class tools like pdf_add_watermark have been implicated in these attack patterns. Read the full case and prevention policy for each:

Browse the full MCP Attack Database →

// OTHER WRITE TOOLS ACROSS MCP SERVERS

Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.

AbraFlexi contact_create AbraFlexi contact_update AbraFlexi evidence_create AbraFlexi evidence_update AbraFlexi invoice_issued_update AbraFlexi invoice_received_create

// RELATED READING

// FAQ

What does the pdf_add_watermark tool do? +

Add a text watermark to PDF pages. Watermark is centered and rotated diagonally by default. Applies to all pages if no page range is specified.. It is categorised as a Write tool in the Pdf Toolkit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pdf_add_watermark? +

Add a rule in your Intercept YAML policy under the tools section for pdf_add_watermark. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Pdf Toolkit MCP server.

What risk level is pdf_add_watermark? +

pdf_add_watermark is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit pdf_add_watermark? +

Yes. Add a rate_limit block to the pdf_add_watermark 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.

How do I block pdf_add_watermark completely? +

Set action: deny in the Intercept policy for pdf_add_watermark. 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.

What MCP server provides pdf_add_watermark? +

pdf_add_watermark is provided by the Pdf Toolkit MCP server (@aryanbv/pdf-toolkit-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

pdf_add_watermark

Enforce policies on Pdf Toolkit