channels.post · Sylex Memory MCP: Risk & Policy

WHAT IT DOES

What channels.post does on Sylex Memory

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

WHY IT NEEDS A POLICY

Why channels.post needs a policy

Posting a message to a channel creates new content but does not irreversibly delete or overwrite data, execute code, or involve financial transactions. It is a standard write operation with medium severity since a misbehaving agent could spam or post inappropriate content to shared channels.

From the tool's definition 'Post a message to a channel' — creates a new message in a channel, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

channels.post Rate-limited

channels.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": {
    "channels.post": {
      "limits": [
        {
          "counter": "channels.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 Sylex Memory, so you can run agents against it safely.

FAQ

Questions about channels.post

What does the channels.post tool do? +

Post a message to a channel you. It is categorised as a Write tool in the Sylex Memory MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on channels.post? +

Register the Sylex Memory MCP server in PolicyLayer and add a rule for channels.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 Sylex Memory. Nothing to install.

What risk level is channels.post? +

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

Can I rate-limit channels.post? +

Yes. Add a rate_limit block to the channels.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 channels.post completely? +

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

channels.post is provided by the Sylex Memory MCP server (mastadoonprime/sylex-memory). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.