# cache_get

Get a value from the optional Redis companion cache

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

## Facts

- Tool: `cache_get`
- 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: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

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

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

## Why cache_get is rated Low

This tool retrieves cached data from Redis without modifying, deleting, or executing anything. It is a simple read operation that returns stored values. The low severity reflects minimal blast radius—misuse would at worst expose cached data the agent is already authorized to access, not create unauthorized side effects.

From the tool's own definition: "Tool name 'cache_get' and description 'Get a value from the optional Redis companion cache' indicate a retrieval operation with no side effects."

## Use case

AI agents call cache_get to retrieve information from Project Guardian MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

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

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "cache_get": {}
  }
}
```

## 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
- `delete_relation` — Destructive — https://policylayer.com/tools/1999azzar-project-guardian-mcp-server/delete-relation.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_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