crosspost · Reddirect MCP: Risk & Policy

WHAT IT DOES

What crosspost does on Reddirect

AI agents use crosspost to create or update resources in Reddirect — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Reddirect environment.

WHY IT NEEDS A POLICY

Why crosspost needs a policy

This tool creates a new crosspost on Reddit by reposting existing content to a different subreddit. It is a write operation (creates new content) that is reversible (posts can be deleted). While it could be misused to spam communities, it does not execute code, destroy data, or involve financial transactions.

From the tool's definition Share an existing Reddit post to a different subreddit as a crosspost

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

crosspost Rate-limited

crosspost 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Reddirect, so you can run agents against it safely.

FAQ

Questions about crosspost

What does the crosspost tool do? +

Share an existing Reddit post to a different subreddit as a crosspost. Provide the URL of the original post and the target subreddit. It is categorised as a Write tool in the Reddirect MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on crosspost? +

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

What risk level is crosspost? +

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

Can I rate-limit crosspost? +

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

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

crosspost is provided by the Reddirect MCP server (jeebus87/reddirect). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.