# update_concept

Update an existing concept in the knowledge graph. Call this after completing a task that changed existing features or components. Only include fields that changed.

Agent View of the PolicyLayer registry record for `update_concept`. HTML page: https://policylayer.com/tools/0xk3vin-megamemory/update-concept

## Facts

- Tool: `update_concept`
- Server: MegaMemory (`0xk3vin/megamemory`) — https://policylayer.com/tools/0xk3vin-megamemory.md
- Homepage: https://github.com/0xK3vin/MegaMemory
- Risk category: Write (Medium risk)
- Registry record: grade D, 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": "update_concept",
    "arguments": {}
  }
}
```

## Why update_concept is rated Medium

This tool creates or modifies data in the knowledge graph reversibly—updates are not permanent deletions and can be corrected. This fits the Write category. Severity is medium because misconfiguration could corrupt architectural records or decision history relied upon by agents, but the effects are limited to metadata about concepts and can be rectified by subsequent updates.

From the tool's own definition: "Tool name 'update_concept' and description states 'Update an existing concept in the knowledge graph.' This explicitly modifies existing data."

## Use case

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

## Recommended policy (PolicyLayer)

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

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

## Other tools on MegaMemory (8)

- `remove_concept` — Destructive — https://policylayer.com/tools/0xk3vin-megamemory/remove-concept.md
- `get_concept` — Read — https://policylayer.com/tools/0xk3vin-megamemory/get-concept.md
- `list_conflicts` — Read — https://policylayer.com/tools/0xk3vin-megamemory/list-conflicts.md
- `list_roots` — Read — https://policylayer.com/tools/0xk3vin-megamemory/list-roots.md
- `understand` — Read — https://policylayer.com/tools/0xk3vin-megamemory/understand.md
- `create_concept` — Write — https://policylayer.com/tools/0xk3vin-megamemory/create-concept.md
- `link` — Write — https://policylayer.com/tools/0xk3vin-megamemory/link.md
- `resolve_conflict` — Write — https://policylayer.com/tools/0xk3vin-megamemory/resolve-conflict.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=0xk3vin-megamemory · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/0xk3vin-megamemory