# get_nonce_for_key

Get the current transaction nonce for a specific nonce key (0-255).

Agent View of the PolicyLayer registry record for `get_nonce_for_key`. HTML page: https://policylayer.com/tools/arome3-tempo-mcp/get-nonce-for-key

## Facts

- Tool: `get_nonce_for_key`
- Server: Tempo (`arome3/tempo-mcp`) — https://policylayer.com/tools/arome3-tempo-mcp.md
- Homepage: https://github.com/arome3/tempo-mcp
- 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": "get_nonce_for_key",
    "arguments": {}
  }
}
```

## Why get_nonce_for_key is rated Low

This tool queries and returns the current nonce value for transaction sequencing purposes. It performs a read-only operation that neither modifies state, executes external operations, nor affects financial holdings. The nonce is informational metadata needed to construct valid transactions, but retrieving it causes no state change or irreversible action.

From the tool's own definition: "Tool name is 'get_nonce_for_key' and description states 'Get the current transaction nonce' — a retrieval operation with no side effects."

## Use case

AI agents call get_nonce_for_key to retrieve information from Tempo 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 Tempo:

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

## Other tools on Tempo (60)

- `burn_blocked_tokens` — Destructive — https://policylayer.com/tools/arome3-tempo-mcp/burn-blocked-tokens.md
- `burn_tokens` — Destructive — https://policylayer.com/tools/arome3-tempo-mcp/burn-tokens.md
- `remove_fee_liquidity` — Destructive — https://policylayer.com/tools/arome3-tempo-mcp/remove-fee-liquidity.md
- `remove_from_whitelist` — Destructive — https://policylayer.com/tools/arome3-tempo-mcp/remove-from-whitelist.md
- `renounce_role` — Destructive — https://policylayer.com/tools/arome3-tempo-mcp/renounce-role.md
- `revoke_access_key` — Destructive — https://policylayer.com/tools/arome3-tempo-mcp/revoke-access-key.md
- `revoke_role` — Destructive — https://policylayer.com/tools/arome3-tempo-mcp/revoke-role.md
- `unpause_token` — Execute — https://policylayer.com/tools/arome3-tempo-mcp/unpause-token.md
- `add_fee_liquidity` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/add-fee-liquidity.md
- `batch_payments` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/batch-payments.md
- `cancel_order` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/cancel-order.md
- `cancel_scheduled_payment` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/cancel-scheduled-payment.md
- `claim_rewards` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/claim-rewards.md
- `create_token` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/create-token.md
- `distribute_rewards` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/distribute-rewards.md
- `mint_tokens` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/mint-tokens.md
- `opt_in_rewards` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/opt-in-rewards.md
- `opt_out_rewards` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/opt-out-rewards.md
- `pause_token` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/pause-token.md
- `place_flip_order` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/place-flip-order.md
- `place_limit_order` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/place-limit-order.md
- `schedule_payment` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/schedule-payment.md
- `send_concurrent_payments` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/send-concurrent-payments.md
- `send_payment` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/send-payment.md
- `send_sponsored_payment` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/send-sponsored-payment.md
- `swap_stablecoins` — Financial — https://policylayer.com/tools/arome3-tempo-mcp/swap-stablecoins.md
- `check_transfer_compliance` — Read — https://policylayer.com/tools/arome3-tempo-mcp/check-transfer-compliance.md
- `estimate_fee_swap` — Read — https://policylayer.com/tools/arome3-tempo-mcp/estimate-fee-swap.md
- `estimate_sponsored_gas` — Read — https://policylayer.com/tools/arome3-tempo-mcp/estimate-sponsored-gas.md
- `get_access_key_info` — Read — https://policylayer.com/tools/arome3-tempo-mcp/get-access-key-info.md
- …and 30 more: https://policylayer.com/tools/arome3-tempo-mcp.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=arome3-tempo-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/arome3-tempo-mcp