# update_relation

Update a relation in the knowledge graph

Agent View of the PolicyLayer registry record for `update_relation`. HTML page: https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/update-relation

## Facts

- Tool: `update_relation`
- Server: Daniel LightRAG MCP Server (`desimpkins/daniel-lightrag-mcp`) — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp.md
- Homepage: https://github.com/desimpkins/daniel-lightrag-mcp
- Risk category: Write (Medium risk)
- Registry record: grade F, 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_relation",
    "arguments": {}
  }
}
```

## Why update_relation is rated Medium

The tool modifies knowledge graph relations, which is a data mutation operation. It does not delete (Destructive), execute arbitrary code (Execute), move money (Financial), or merely read data (Read). Update operations are reversible and fall under Write category.

From the tool's own definition: "Tool name is 'update_relation' and description states 'Update a relation in the knowledge graph' — indicates modification of existing graph data in a reversible manner."

## Use case

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

## Recommended policy (PolicyLayer)

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

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

## Other tools on Daniel LightRAG MCP Server (20)

- `delete_document` — Destructive — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/delete-document.md
- `delete_entity` — Destructive — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/delete-entity.md
- `delete_relation` — Destructive — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/delete-relation.md
- `check_entity_exists` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/check-entity-exists.md
- `get_document_status_counts` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/get-document-status-counts.md
- `get_documents` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/get-documents.md
- `get_documents_paginated` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/get-documents-paginated.md
- `get_graph_labels` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/get-graph-labels.md
- `get_health` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/get-health.md
- `get_knowledge_graph` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/get-knowledge-graph.md
- `get_pipeline_status` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/get-pipeline-status.md
- `get_track_status` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/get-track-status.md
- `hello` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/hello.md
- `query_text` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/query-text.md
- `query_text_stream` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/query-text-stream.md
- `scan_documents` — Read — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/scan-documents.md
- `insert_text` — Write — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/insert-text.md
- `insert_texts` — Write — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/insert-texts.md
- `update_entity` — Write — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/update-entity.md
- `upload_document` — Write — https://policylayer.com/tools/desimpkins-daniel-lightrag-mcp/upload-document.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=desimpkins-daniel-lightrag-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/desimpkins-daniel-lightrag-mcp