memory_apply_template · Claude Memory MCP: Risk & Policy

WHAT IT DOES

What memory_apply_template does on Claude Memory MCP

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

WHY IT NEEDS A POLICY

Why memory_apply_template needs a policy

This tool creates or modifies project-level data (rules and memories) based on a template, making it a Write operation. The severity is medium because misuse could inject unwanted rules or memories into a project, affecting subsequent operations, but the action is reversible (rules can be deleted via memory_delete_rule and data via memory_delete).

From the tool's definition The tool applies templates by name into a project, which creates or modifies data within the memory system. The description indicates it 'Apply[s] a template's rules/memories into a project', which is a create/add operation rather than retrieval or deletion.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

memory_apply_template Rate-limited

memory_apply_template 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": {
    "memory_apply_template": {
      "limits": [
        {
          "counter": "memory_apply_template_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 Claude Memory MCP, so you can run agents against it safely.

FAQ

Questions about memory_apply_template

What does the memory_apply_template tool do? +

Apply a template's rules/memories into a project (by template name). It is categorised as a Write tool in the Claude Memory MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on memory_apply_template? +

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

What risk level is memory_apply_template? +

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

Can I rate-limit memory_apply_template? +

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

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

memory_apply_template is provided by the Claude Memory MCP server (navid-kianfar/claude-memory-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.