set_markdown

THE RISK

Medium Risk

Why set_markdown needs a policy

This tool modifies displayed content by setting markdown, which is a reversible write operation affecting the visual interface. It does not execute code, delete data, or trigger external operations. The blast radius is minimal—it only affects UI rendering. Severity is low because markdown display changes are non-destructive and scoped to presentation.

From the tool's definition Tool name 'set_markdown' and description 'Set the displayed content to markdown' indicate content creation/modification of UI display state.

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

POLICY

How to control set_markdown

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

policy.json

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

set_markdown 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 Pane — 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 Pane tools

Destructive clear_user_context Clear all stored user context values. Resets the persistent store to empty. Destructive reset Reset the display to initial state (cancels pending input) Execute execute_action Execute an action to change the app state. Must be one of the available actions from get_c Execute toggle_sidebar Toggle the sidebar visibility Write append Append content to the current display Write show_input_form Display an input form to the user and request their input. Returns immediately - use get_u Write show_multi_form Display a multi-field form to collect multiple inputs at once. All field values are stored Write undo Undo the last change

All 15 Pane 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 set_markdown

What does the set_markdown tool do? +

Set the displayed content to markdown. It is categorised as a Write tool in the Pane MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_markdown? +

Register the Pane MCP server in PolicyLayer and add a rule for set_markdown: 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 Pane. Nothing to install.

What risk level is set_markdown? +

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

Can I rate-limit set_markdown? +

Yes. Add a rate_limit block to the set_markdown 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 set_markdown completely? +

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

set_markdown is provided by the Pane MCP server (zabaca/pane). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Pane tool call.

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

CHECK YOUR STACK →