add_image_transition

THE RISK

Medium Risk

Why add_image_transition needs a policy

This tool creates and inserts new slide content into an existing presentation, which is a reversible write operation. While it modifies the presentation structure, the changes can be undone or edited without permanent data loss.

From the tool's definition Insert a full-screen background image slide immediately before the specified slide—creates new slide content that modifies the presentation structure by injecting a transition effect.

Documented attack patterns abuse exactly the kind of access add_image_transition gives an agent:

POLICY

How to control add_image_transition

PolicyLayer is an MCP gateway — it sits between your AI agents and Marp MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for add_image_transition:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_image_transition": {
      "limits": [
        {
          "counter": "add_image_transition_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

add_image_transition stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Marp MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Marp MCP Server tools

Write batch_manage_slides Apply multiple slide operations (insert/replace/delete/move) to a Marp file in a single fi Write create_presentation Create a new Marp presentation file in one step — initializes frontmatter, adds a title sl Write export_slide Export a Marp markdown presentation to HTML, PDF, or PPTX using marp-cli. Write generate_agenda Auto-generate an agenda slide from section slides (detected by CSS class) and insert it be Write generate_slide_ids Assign stable UUID slide IDs to every slide in a Marp file. Write manage_slide Insert, replace, or delete slides in a Marp file using slide IDs. Write set_frontmatter Initialize or update required Marp frontmatter (marp:true, theme, header, paginate) and in Read list_layouts List all available slide layouts with their required/optional parameters.

All 11 Marp MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about add_image_transition

What does the add_image_transition tool do? +

Insert a full-screen background image slide immediately before the specified slide to create a zoom-in transition effect. It is categorised as a Write tool in the Marp MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_image_transition? +

Register the Marp MCP Server MCP server in PolicyLayer and add a rule for add_image_transition: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Marp MCP Server. Nothing to install.

What risk level is add_image_transition? +

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

Can I rate-limit add_image_transition? +

Yes. Add a rate_limit block to the add_image_transition rule in your PolicyLayer 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 add_image_transition completely? +

Set action: deny in the PolicyLayer policy for add_image_transition. 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 add_image_transition? +

add_image_transition is provided by the Marp MCP Server MCP server (masaki39/marp-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Marp MCP Server tool call.

Start from Marp MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →