From b51bfc338149840f05d1c7d51bb3251d7f61d34c Mon Sep 17 00:00:00 2001
From: MD JUBER QURAISHI <qjuber066@gmail.com>
Date: Thu, 26 Mar 2026 22:29:42 +0530
Subject: [PATCH 1/2] feat: define RoutingSource string literal union

---
 packages/core-ts/src/routing/types.ts | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/packages/core-ts/src/routing/types.ts b/packages/core-ts/src/routing/types.ts
index bf6b5a3c..ae263c19 100644
--- a/packages/core-ts/src/routing/types.ts
+++ b/packages/core-ts/src/routing/types.ts
@@ -1,5 +1,7 @@
 import { ErrorCode, Warning } from "../address/types";
 
+export type RoutingSource = "muxed" | "memo" | "none";
+
 export type RoutingInput = {
   destination: string;
   memoType: string;
@@ -12,18 +14,14 @@ export type KnownMemoType = "none" | "id" | "text" | "hash" | "return";
 export type RoutingResult = {
   destinationBaseAccount: string | null;
   routingId: string | null; // decimal uint64 string — spec level
-  routingSource: "muxed" | "memo" | "none";
+  routingSource: RoutingSource;
   warnings: Warning[]; // WarningCode only, always
   destinationError?: {
-    // ErrorCode only, when destination unparseable
     code: ErrorCode;
     message: string;
   };
 };
 
-/**
- * Ergonomic helper for TypeScript callers to get a BigInt from the routingId string.
- */
 export function routingIdAsBigInt(routingId: string | null): bigint | null {
   return routingId ? BigInt(routingId) : null;
-}
+}
\ No newline at end of file

From d9d54efecd1f1e4c9f1a34fc4daca0d56fbee990 Mon Sep 17 00:00:00 2001
From: MD JUBER QURAISHI <qjuber066@gmail.com>
Date: Thu, 26 Mar 2026 23:01:30 +0530
Subject: [PATCH 2/2] fix: add contract-sender warning for C-address in
 extractRouting

---
 packages/core-ts/src/routing/extract.ts | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/packages/core-ts/src/routing/extract.ts b/packages/core-ts/src/routing/extract.ts
index 029d55a1..7ae0a697 100644
--- a/packages/core-ts/src/routing/extract.ts
+++ b/packages/core-ts/src/routing/extract.ts
@@ -21,18 +21,20 @@ export function extractRouting(input: RoutingInput): RoutingResult {
   }
 
   if (parsed.kind === "C") {
+    const warnings: Warning[] = [...parsed.warnings];
+
+    warnings.push({
+      code: "CONTRACT_SENDER_DETECTED",
+      severity: "warn",
+      message:
+        "Contract address detected. Contract addresses cannot be used as transaction senders.",
+    });
+
     return {
       destinationBaseAccount: null,
       routingId: null,
       routingSource: "none",
-      warnings: [
-        {
-          code: "INVALID_DESTINATION",
-          severity: "error",
-          message: "C address is not a valid destination",
-          context: { destinationKind: "C" },
-        },
-      ],
+      warnings,
     };
   }
 
@@ -99,17 +101,15 @@ export function extractRouting(input: RoutingInput): RoutingResult {
     }
   } else if (input.memoType === "hash" || input.memoType === "return") {
     warnings.push({
-      code: "UNSUPPORTED_MEMO_TYPE",
+      code: "MEMO_TEXT_UNROUTABLE",
       severity: "warn",
       message: `Memo type ${input.memoType} is not supported for routing.`,
-      context: { memoType: input.memoType },
     });
   } else if (input.memoType !== "none") {
     warnings.push({
-      code: "UNSUPPORTED_MEMO_TYPE",
+      code: "MEMO_TEXT_UNROUTABLE",
       severity: "warn",
       message: `Unrecognized memo type: ${input.memoType}`,
-      context: { memoType: "unknown" },
     });
   }