knowledge_remember · Ralph Hero MCP: Risk & Policy

WHAT IT DOES

What knowledge_remember does on Ralph Hero

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

WHY IT NEEDS A POLICY

Why knowledge_remember needs a policy

The tool writes a new file to disk and updates an index, which is a reversible write operation. It creates persistent memory entries but does not execute code or delete data. Misuse could pollute the memory store with false observations or decisions that influence future agent sessions, hence medium severity.

From the tool's definition Persist a piece of text as a raw memory under ~/projects/thoughts/dream-memories/agent/YYYY/MM/DD/<source>-<hash12>.md and incrementally reindex it

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

knowledge_remember Rate-limited

knowledge_remember 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": {
    "knowledge_remember": {
      "limits": [
        {
          "counter": "knowledge_remember_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 Ralph Hero, so you can run agents against it safely.

FAQ

Questions about knowledge_remember

What does the knowledge_remember tool do? +

Persist a piece of text as a raw memory under ~/projects/thoughts/dream-memories/agent/YYYY/MM/DD/<source>-<hash12>.md and incrementally reindex it. Use this to record agent observations, decisions, or context worth recalling in a future session. Tier defaults to. It is categorised as a Write tool in the Ralph Hero MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on knowledge_remember? +

Register the Ralph Hero MCP server in PolicyLayer and add a rule for knowledge_remember: 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 Ralph Hero. Nothing to install.

What risk level is knowledge_remember? +

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

Can I rate-limit knowledge_remember? +

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

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

knowledge_remember is provided by the Ralph Hero MCP server (ralph-hero-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.