mixpost_update_post · Mixpost MCP: Risk & Policy

WHAT IT DOES

What mixpost_update_post does on Mixpost

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

WHY IT NEEDS A POLICY

Why mixpost_update_post needs a policy

The tool modifies existing social media post content, which is a Write operation (data modification that can be undone by updating again). Severity is medium because misuse could affect public content and brand reputation, but the effect is limited to individual posts and reversible. High confidence due to explicit 'update' verb and clear description of post modification.

From the tool's definition Tool name is 'mixpost_update_post' and description states it will 'Update an existing social media post' — this modifies data reversibly without deletion.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mixpost_update_post Rate-limited

mixpost_update_post 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": {
    "mixpost_update_post": {
      "limits": [
        {
          "counter": "mixpost_update_post_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 Mixpost, so you can run agents against it safely.

FAQ

Questions about mixpost_update_post

What does the mixpost_update_post tool do? +

Update an existing social media post. It is categorised as a Write tool in the Mixpost MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mixpost_update_post? +

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

What risk level is mixpost_update_post? +

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

Can I rate-limit mixpost_update_post? +

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

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

mixpost_update_post is provided by the Mixpost MCP server (pfarag/mixpost-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.