add_decision · MCP Memory Server MCP: Risk & Policy

WHAT IT DOES

What add_decision does on MCP Memory Server

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

WHY IT NEEDS A POLICY

Why add_decision needs a policy

This tool creates new entries (decisions) in a persistent memory system. It is Write rather than Read (it stores, not retrieves), not Destructive (decisions can be modified or removed), not Execute (it doesn't run code or trigger external operations), and not Financial.

From the tool's definition Tool name 'add_decision' and description 'Record an important technical decision' indicates creation of new decision records in persistent memory.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_decision Rate-limited

add_decision 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": {
    "add_decision": {
      "limits": [
        {
          "counter": "add_decision_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 MCP Memory Server, so you can run agents against it safely.

FAQ

Questions about add_decision

What does the add_decision tool do? +

Record an important technical decision. It is categorised as a Write tool in the MCP Memory Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_decision? +

Register the MCP Memory Server MCP server in PolicyLayer and add a rule for add_decision: 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 MCP Memory Server. Nothing to install.

What risk level is add_decision? +

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

Can I rate-limit add_decision? +

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

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

add_decision is provided by the MCP Memory Server MCP server (keleshteri/mcp-memory). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.