diff --git a/src/common/utils/tools/toolDefinitions.test.ts b/src/common/utils/tools/toolDefinitions.test.ts
index f62bd049d8..9011bb01db 100644
--- a/src/common/utils/tools/toolDefinitions.test.ts
+++ b/src/common/utils/tools/toolDefinitions.test.ts
@@ -152,6 +152,37 @@ describe("TOOL_DEFINITIONS", () => {
     expect(parsed.success).toBe(false);
   });
 
+  it("accepts bash tool calls using description (alias for display_name)", () => {
+    // DeepSeek v4 emits `description` instead of `display_name`; ensure it normalizes.
+    const parsed = TOOL_DEFINITIONS.bash.schema.safeParse({
+      script: "ls",
+      timeout_secs: 60,
+      run_in_background: false,
+      description: "List files",
+    });
+
+    expect(parsed.success).toBe(true);
+    if (parsed.success) {
+      expect(parsed.data.display_name).toBe("List files");
+      expect("description" in parsed.data).toBe(false);
+    }
+  });
+
+  it("prefers display_name when both display_name and description are provided", () => {
+    const parsed = TOOL_DEFINITIONS.bash.schema.safeParse({
+      script: "ls",
+      timeout_secs: 60,
+      run_in_background: false,
+      display_name: "Real Name",
+      description: "Alias Name",
+    });
+
+    expect(parsed.success).toBe(true);
+    if (parsed.success) {
+      expect(parsed.data.display_name).toBe("Real Name");
+    }
+  });
+
   const filePathAliasCases = [
     {
       toolName: "file_read",
diff --git a/src/common/utils/tools/toolDefinitions.ts b/src/common/utils/tools/toolDefinitions.ts
index fe489597d5..e54f5b173b 100644
--- a/src/common/utils/tools/toolDefinitions.ts
+++ b/src/common/utils/tools/toolDefinitions.ts
@@ -852,16 +852,22 @@ export const TOOL_DEFINITIONS = {
         // Normalize to `script` so downstream code (tool runner + UI) stays consistent.
         if (typeof value !== "object" || value === null || Array.isArray(value)) return value;
 
-        const obj = value as Record<string, unknown>;
-        if (typeof obj.script === "string") return value;
+        let obj = value as Record<string, unknown>;
 
-        if (typeof obj.command === "string") {
+        if (typeof obj.script !== "string" && typeof obj.command === "string") {
           // Drop the legacy field to keep tool args canonical (and avoid confusing downstream consumers).
           const { command, ...rest } = obj as Record<string, unknown> & { command: string };
-          return { ...rest, script: command };
+          obj = { ...rest, script: command };
         }
 
-        return value;
+        // Compatibility: DeepSeek v4 emits `description` instead of `display_name`.
+        // Treat `description` as an undocumented alias so the call still validates.
+        if (typeof obj.display_name !== "string" && typeof obj.description === "string") {
+          const { description, ...rest } = obj as Record<string, unknown> & { description: string };
+          obj = { ...rest, display_name: description };
+        }
+
+        return obj;
       },
       z.object({
         script: z.string().describe("The bash script/command to execute"),