# sign_message

Sign a plain text message using EIP-191 personal_sign. Returns signature and signer address.

Agent View of the PolicyLayer registry record for `sign_message`. HTML page: https://policylayer.com/tools/nirholas-agenti/sign-message

## Facts

- Tool: `sign_message`
- Server: Agenti (`nirholas/agenti`) — https://policylayer.com/tools/nirholas-agenti.md
- Homepage: https://github.com/nirholas/agenti
- Risk category: Execute (High 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": "sign_message",
    "arguments": {}
  }
}
```

## Why sign_message is rated High

Signing a message with a private key is a cryptographic execution operation. While it doesn't directly move funds, EIP-191 personal_sign signatures can be used to authorize transactions, authenticate to DeFi protocols, or approve on-chain actions. In the context of a server explicitly designed to 'spend, earn, and receive cryptocurrency,' a misused signing operation could enable unauthorized financial actions.

From the tool's own definition: "Sign a plain text message using EIP-191 personal_sign. Returns signature and signer address."

## Use case

AI agents invoke sign_message to trigger actions in Agenti. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

## Recommended policy (PolicyLayer)

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

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "sign_message": {
      "limits": [
        {
          "counter": "sign_message_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Agenti (72)

- `binance_cancel_order` — Destructive — https://policylayer.com/tools/nirholas-agenti/binance-cancel-order.md
- `agenti_pay` — Financial — https://policylayer.com/tools/nirholas-agenti/agenti-pay.md
- `agenti_receive` — Financial — https://policylayer.com/tools/nirholas-agenti/agenti-receive.md
- `binance_place_order` — Financial — https://policylayer.com/tools/nirholas-agenti/binance-place-order.md
- `bitrefill_check_order` — Financial — https://policylayer.com/tools/nirholas-agenti/bitrefill-check-order.md
- `bitrefill_create_invoice` — Financial — https://policylayer.com/tools/nirholas-agenti/bitrefill-create-invoice.md
- `bnb_swap` — Financial — https://policylayer.com/tools/nirholas-agenti/bnb-swap.md
- `bnb_transfer` — Financial — https://policylayer.com/tools/nirholas-agenti/bnb-transfer.md
- `create_invoice` — Financial — https://policylayer.com/tools/nirholas-agenti/create-invoice.md
- `gmgn_copy_trade` — Financial — https://policylayer.com/tools/nirholas-agenti/gmgn-copy-trade.md
- `jupiter_swap` — Financial — https://policylayer.com/tools/nirholas-agenti/jupiter-swap.md
- `pay` — Financial — https://policylayer.com/tools/nirholas-agenti/pay.md
- `pump_buy` — Financial — https://policylayer.com/tools/nirholas-agenti/pump-buy.md
- `pump_sell` — Financial — https://policylayer.com/tools/nirholas-agenti/pump-sell.md
- `solana_deploy_token` — Financial — https://policylayer.com/tools/nirholas-agenti/solana-deploy-token.md
- `solana_stake` — Financial — https://policylayer.com/tools/nirholas-agenti/solana-stake.md
- `solana_swap` — Financial — https://policylayer.com/tools/nirholas-agenti/solana-swap.md
- `solana_transfer` — Financial — https://policylayer.com/tools/nirholas-agenti/solana-transfer.md
- `derive_wallet` — Other — https://policylayer.com/tools/nirholas-agenti/derive-wallet.md
- `generate_mnemonic` — Other — https://policylayer.com/tools/nirholas-agenti/generate-mnemonic.md
- `agenti_balance` — Read — https://policylayer.com/tools/nirholas-agenti/agenti-balance.md
- `binance_get_24h_stats` — Read — https://policylayer.com/tools/nirholas-agenti/binance-get-24h-stats.md
- `binance_get_account` — Read — https://policylayer.com/tools/nirholas-agenti/binance-get-account.md
- `binance_get_klines` — Read — https://policylayer.com/tools/nirholas-agenti/binance-get-klines.md
- `binance_get_open_orders` — Read — https://policylayer.com/tools/nirholas-agenti/binance-get-open-orders.md
- `binance_get_orderbook` — Read — https://policylayer.com/tools/nirholas-agenti/binance-get-orderbook.md
- `binance_get_price` — Read — https://policylayer.com/tools/nirholas-agenti/binance-get-price.md
- `binance_get_top_symbols` — Read — https://policylayer.com/tools/nirholas-agenti/binance-get-top-symbols.md
- `binance_get_trade_history` — Read — https://policylayer.com/tools/nirholas-agenti/binance-get-trade-history.md
- `binance_search_symbol` — Read — https://policylayer.com/tools/nirholas-agenti/binance-search-symbol.md
- …and 42 more: https://policylayer.com/tools/nirholas-agenti.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=nirholas-agenti · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/nirholas-agenti