mixpost_update_media · Mixpost MCP: Risk & Policy

WHAT IT DOES

What mixpost_update_media does on Mixpost

AI agents use mixpost_update_media 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_media needs a policy

This tool modifies metadata associated with media files in a social media management context. While the changes are reversible and do not delete or destroy data, updating metadata could affect how content appears across social platforms.

From the tool's definition Tool name 'mixpost_update_media' and description 'Update media file metadata' indicate modification of existing data. The action is reversible (metadata can be changed again), distinguishing it from destructive operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mixpost_update_media Rate-limited

mixpost_update_media 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_media": {
      "limits": [
        {
          "counter": "mixpost_update_media_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_media

What does the mixpost_update_media tool do? +

Update media file metadata. 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_media? +

Register the Mixpost MCP server in PolicyLayer and add a rule for mixpost_update_media: 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_media? +

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

Can I rate-limit mixpost_update_media? +

Yes. Add a rate_limit block to the mixpost_update_media 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_media completely? +

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

mixpost_update_media 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.