feat: adding get_address_from_private_key tool

Author: wayzeek

src/core/operations/clients.ts

@@ -4,7 +4,8 @@ import {
   http, 
   type PublicClient,
   type WalletClient,
-  type Hex
+  type Hex,
+  type Address
 } from 'viem';
 import { privateKeyToAccount } from 'viem/accounts';
 import { getChain, getRpcUrl } from '../chains.js';
@@ -51,4 +52,14 @@ export function getWalletClient(privateKey: Hex, network = 'ethereum'): WalletCl
     chain,
     transport: http(rpcUrl)
   });
+}
+
+/**
+ * Get an Ethereum address from a private key
+ * @param privateKey The private key in hex format (with or without 0x prefix)
+ * @returns The Ethereum address derived from the private key
+ */
+export function getAddressFromPrivateKey(privateKey: Hex): Address {
+  const account = privateKeyToAccount(privateKey);
+  return account.address;
 } 

src/core/tools.ts

@@ -1156,4 +1156,41 @@ export function registerEVMTools(server: McpServer) {
       }
     }
   );
+
+  // WALLET TOOLS
+
+  // Get address from private key
+  server.tool(
+    "get_address_from_private_key",
+    "Get the EVM address derived from a private key",
+    {
+      privateKey: z.string().describe("Private key in hex format (with or without 0x prefix). SECURITY: This is used only for address derivation and is not stored.")
+    },
+    async ({ privateKey }) => {
+      try {
+        // Ensure the private key has 0x prefix
+        const formattedKey = privateKey.startsWith('0x') ? privateKey as Hex : `0x${privateKey}` as Hex;
+        
+        const address = operations.getAddressFromPrivateKey(formattedKey);
+        
+        return {
+          content: [{
+            type: "text",
+            text: JSON.stringify({
+              address,
+              privateKey: "0x" + privateKey.replace(/^0x/, '')
+            }, null, 2)
+          }]
+        };
+      } catch (error) {
+        return {
+          content: [{
+            type: "text",
+            text: `Error deriving address from private key: ${error instanceof Error ? error.message : String(error)}`
+          }],
+          isError: true
+        };
+      }
+    }
+  );
 }