# delete_relation

Delete relation(s) between project entities

Agent View of the PolicyLayer registry record for `delete_relation`. HTML page: https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/delete-relation

## Facts

- Tool: `delete_relation`
- Server: Project Guardian MCP (`1999azzar/project-guardian-mcp-server`) — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server.md
- Homepage: https://github.com/1999AZZAR/project-guardian-mcp-server
- Risk category: Destructive (Critical risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Hidden

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

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

## Why delete_relation is rated Critical

This tool permanently removes relationship data from the project memory system. Deletion operations are irreversible and cannot be undone through normal API operations. While the blast radius is scoped to relation data rather than entities themselves, the destruction of knowledge graph connections could break workflow dependencies and lose important project context.

From the tool's own definition: "Tool name is 'delete_relation' with description 'Delete relation(s) between project entities'. The verb 'delete' combined with the function of removing relations from a knowledge graph represents irreversible data deletion."

## Use case

AI agents call delete_relation to permanently remove resources in Project Guardian MCP, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.

## Recommended policy (PolicyLayer)

Verdict: **Hidden**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Project Guardian MCP:

```json
{
  "version": "1",
  "default": "deny",
  "hide": [
    "delete_relation"
  ]
}
```

## Other tools on Project Guardian MCP (37)

- `cache_delete` — Destructive — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/cache-delete.md
- `delete_data` — Destructive — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/delete-data.md
- `delete_entity` — Destructive — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/delete-entity.md
- `delete_observation` — Destructive — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/delete-observation.md
- `close_ui` — Execute — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/close-ui.md
- `execute_sql` — Execute — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/execute-sql.md
- `initialize_memory` — Execute — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/initialize-memory.md
- `scan_container_image` — Execute — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/scan-container-image.md
- `start_ui` — Execute — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/start-ui.md
- `stop_ui` — Execute — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/stop-ui.md
- `analyze_git_changes` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/analyze-git-changes.md
- `cache_get` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/cache-get.md
- `cache_scan` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/cache-scan.md
- `export_data` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/export-data.md
- `get_file_context` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/get-file-context.md
- `get_project_guidance` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/get-project-guidance.md
- `get_session_context` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/get-session-context.md
- `get_timeline` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/get-timeline.md
- `inspect_untrusted_text` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/inspect-untrusted-text.md
- `list_harness_stores` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/list-harness-stores.md
- `open_node` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/open-node.md
- `query_data` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/query-data.md
- `read_graph` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/read-graph.md
- `read_graph_stream` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/read-graph-stream.md
- `scan_project_secrets` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/scan-project-secrets.md
- `search_nodes` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/search-nodes.md
- `sync_central_memory` — Read — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/sync-central-memory.md
- `add_observation` — Write — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/add-observation.md
- `cache_set` — Write — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/cache-set.md
- `create_entity` — Write — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/create-entity.md
- …and 7 more: https://policylayer.com/tools/1999azzar-project-guardian-mcp-server.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`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=1999azzar-project-guardian-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/1999azzar-project-guardian-mcp-server