# list_database_engines

List the database engines this node can serve — each with its data

Agent View of the PolicyLayer registry record for `list_database_engines`. HTML page: https://policylayer.com/tools/network-tenzro-tenzro/list-database-engines

## Facts

- Tool: `list_database_engines`
- Server: Tenzro Ledger MCP (`https://canton-mcp.tenzro.network/mcp`) — https://policylayer.com/tools/network-tenzro-tenzro.md
- Homepage: https://github.com/tenzro/tenzro-network
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: gated_ambiguous
- Server CORS policy: *
- 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": "list_database_engines",
    "arguments": {}
  }
}
```

## Why list_database_engines is rated Low

This is a read-only operation that retrieves information about database engines. The verb 'list' combined with the description indicating enumeration of engines confirms it performs no side effects, reversible writes, code execution, destructive actions, or financial operations. Blast radius is minimal—an attacker learning what database engines are available on a node poses low risk.

From the tool's own definition: "Tool name 'list_database_engines' and description 'List the database engines this node can serve — each with its data' indicate a retrieval operation that queries or enumerates available database engines and their metadata without modifying anything."

## Use case

AI agents call list_database_engines to retrieve information from Tenzro Ledger 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 Tenzro Ledger MCP:

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

## Other tools on Tenzro Ledger MCP (359)

- `clear_secure_mint_policy` — Destructive — https://policylayer.com/tools/network-tenzro-tenzro/clear-secure-mint-policy.md
- `delete_model` — Destructive — https://policylayer.com/tools/network-tenzro-tenzro/delete-model.md
- `deregister_agent` — Destructive — https://policylayer.com/tools/network-tenzro-tenzro/deregister-agent.md
- `drop_database` — Destructive — https://policylayer.com/tools/network-tenzro-tenzro/drop-database.md
- `forget_identity` — Destructive — https://policylayer.com/tools/network-tenzro-tenzro/forget-identity.md
- `freeze_address` — Destructive — https://policylayer.com/tools/network-tenzro-tenzro/freeze-address.md
- `revoke_did` — Destructive — https://policylayer.com/tools/network-tenzro-tenzro/revoke-did.md
- `revoke_session` — Destructive — https://policylayer.com/tools/network-tenzro-tenzro/revoke-session.md
- `secure_mint_record_burn` — Destructive — https://policylayer.com/tools/network-tenzro-tenzro/secure-mint-record-burn.md
- `urwa_clear_kill_switch` — Destructive — https://policylayer.com/tools/network-tenzro-tenzro/urwa-clear-kill-switch.md
- `urwa_trigger_kill_switch` — Destructive — https://policylayer.com/tools/network-tenzro-tenzro/urwa-trigger-kill-switch.md
- `x402_deregister_resource` — Destructive — https://policylayer.com/tools/network-tenzro-tenzro/x402-deregister-resource.md
- `assign_task` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/assign-task.md
- `axelar_call_contract` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/axelar-call-contract.md
- `babylon_submit_finality_signature` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/babylon-submit-finality-signature.md
- `canton_submit_command` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/canton-submit-command.md
- `chat_completion` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/chat-completion.md
- `chat_stream` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/chat-stream.md
- `create_swarm` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/create-swarm.md
- `database_query` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/database-query.md
- `deploy_contract` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/deploy-contract.md
- `derive_key` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/derive-key.md
- `download_model` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/download-model.md
- `encode_function` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/encode-function.md
- `encrypt_data` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/encrypt-data.md
- `hyperlane_dispatch` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/hyperlane-dispatch.md
- `moe_forward` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/moe-forward.md
- `rotate_validator_key` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/rotate-validator-key.md
- `send_agent_message` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/send-agent-message.md
- `set_secure_mint_paused` — Execute — https://policylayer.com/tools/network-tenzro-tenzro/set-secure-mint-paused.md
- …and 329 more: https://policylayer.com/tools/network-tenzro-tenzro.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=network-tenzro-tenzro · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/network-tenzro-tenzro