Matrix: restore ordered progress delivery with explicit streaming modes (#59266)

Merged via squash.

Prepared head SHA: 523623b7e1
Co-authored-by: gumadeiras <5599352+gumadeiras@users.noreply.github.com>
Co-authored-by: gumadeiras <5599352+gumadeiras@users.noreply.github.com>
Reviewed-by: @gumadeiras

src/utils/provider-utils.ts

@@ -46,6 +46,9 @@ export function resolveReasoningOutputMode(params: {
   // handles reasoning natively via the `reasoning` field in streaming chunks,
   // so tag-based enforcement is unnecessary and causes all output to be
   // discarded as "(no output)" (#2279).
+  // Note: MiniMax is also intentionally excluded. In production it does not
+  // reliably wrap user-visible output in <final> tags, so forcing tag
+  // enforcement suppresses normal assistant replies.
   if (
     normalized === "google" ||
     normalized === "google-gemini-cli" ||
@@ -54,11 +57,6 @@ export function resolveReasoningOutputMode(params: {
     return "tagged";
   }
 
-  // Handle Minimax (M2.5 is chatty/reasoning-like)
-  if (normalized.includes("minimax")) {
-    return "tagged";
-  }
-
   return "native";
 }
 

src/utils/utils-misc.test.ts

@@ -70,8 +70,16 @@ describe("isReasoningTagProvider", () => {
       value: "google-generative-ai",
       expected: true,
     },
-    { name: "returns true for minimax", value: "minimax", expected: true },
-    { name: "returns true for minimax-cn", value: "minimax-cn", expected: true },
+    {
+      name: "returns false for minimax - does not reliably honor <final> wrappers in production",
+      value: "minimax",
+      expected: false,
+    },
+    {
+      name: "returns false for minimax-cn",
+      value: "minimax-cn",
+      expected: false,
+    },
     { name: "returns false for null", value: null, expected: false },
     { name: "returns false for undefined", value: undefined, expected: false },
     { name: "returns false for empty", value: "", expected: false },
@@ -83,7 +91,7 @@ describe("isReasoningTagProvider", () => {
     value: string | null | undefined;
     expected: boolean;
   }>)("$name", ({ value, expected }) => {
-    expect(isReasoningTagProvider(value)).toBe(expected);
+    expect(isReasoningTagProvider(value, { workspaceDir: process.cwd() })).toBe(expected);
   });
 });