rsync_copy

THE RISK

High Risk

Why rsync_copy needs a policy

rsync_copy executes the rsync command to transfer files between systems. While it is primarily a file-transfer operation, rsync can overwrite destination files, delete files at the destination (with --delete flag), and execute across remote systems via SSH.

From the tool's definition Copy files/directories between local and remote server via rsync

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

POLICY

How to control rsync_copy

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "rsync_copy": {
      "limits": [
        {
          "counter": "rsync_copy_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

rsync_copy stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register SSH 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.

RATE-LIMIT THIS TOOL →

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EXPLORE

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All 15 SSH MCP Server tools →

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Go deeper

High-risk tools in SSH MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about rsync_copy

What does the rsync_copy tool do? +

Copy files/directories between local and remote server via rsync (best for directories or large transfers). It is categorised as a Execute tool in the SSH MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on rsync_copy? +

Register the SSH MCP Server MCP server in PolicyLayer and add a rule for rsync_copy: 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 SSH MCP Server. Nothing to install.

What risk level is rsync_copy? +

rsync_copy is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit rsync_copy? +

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

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

rsync_copy is provided by the SSH MCP Server MCP server (kinothe-kafkaesque/ssh-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every SSH MCP Server tool call.

Start from SSH 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 →