# write_to_memory

Updates the user

Agent View of the PolicyLayer registry record for `write_to_memory`. HTML page: https://policylayer.com/tools/3mdistal-css-mcp-server/write-to-memory

## Facts

- Tool: `write_to_memory`
- Server: Css Tutor (`3mdistal/css-mcp-server`) — https://policylayer.com/tools/3mdistal-css-mcp-server.md
- Homepage: https://github.com/3mdistal/css-mcp-server
- Risk category: Write (Medium risk)
- Registry record: grade B, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "write_to_memory",
    "arguments": {}
  }
}
```

## Why write_to_memory is rated Medium

This tool creates or modifies user data (knowledge tracking, preferences, or learning progress) in a reversible manner. It does not delete data (Destructive), execute arbitrary code (Execute), involve financial transactions (Financial), or merely read data (Read).

From the tool's own definition: "Tool name 'write_to_memory' and description 'Updates the user' indicate data modification. The context shows this is part of a tutoring system that 'tracking user knowledge,' suggesting persistent state updates to user learning records."

## Use case

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

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Css Tutor:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "write_to_memory": {
      "limits": [
        {
          "counter": "write_to_memory_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Css Tutor (2)

- `get_latest_updates` — Read — https://policylayer.com/tools/3mdistal-css-mcp-server/get-latest-updates.md
- `read_from_memory` — Read — https://policylayer.com/tools/3mdistal-css-mcp-server/read-from-memory.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=3mdistal-css-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/3mdistal-css-mcp-server