diff --git a/scripts/build/pack-artifact-policy.ts b/scripts/build/pack-artifact-policy.ts
index 11939e660e..99574dc081 100644
--- a/scripts/build/pack-artifact-policy.ts
+++ b/scripts/build/pack-artifact-policy.ts
@@ -101,10 +101,16 @@ export const PACK_ARTIFACT_ROOT_ALLOWED_PATH_PREFIXES: string[] = [
   "@omniroute/opencode-plugin/",
   "@omniroute/opencode-provider/",
   "bin/cli/",
-  "open-sse/mcp-server/schemas/",
-  "open-sse/mcp-server/tools/",
-  "src/lib/cli-helper/",
-  "src/shared/contracts/",
+  // Broad open-sse + src source dirs added to package.json "files" in v3.8.21
+  // to allow TypeScript-first imports from the published package.
+  "open-sse/",
+  "src/domain/",
+  "src/lib/",
+  "src/mitm/",
+  "src/server/",
+  "src/shared/",
+  "src/sse/",
+  "src/types/",
 ];
 
 export const PACK_ARTIFACT_REQUIRED_PATHS: string[] = [
diff --git a/scripts/build/validate-pack-artifact.ts b/scripts/build/validate-pack-artifact.ts
index 95a97c55db..bd92a48ecd 100644
--- a/scripts/build/validate-pack-artifact.ts
+++ b/scripts/build/validate-pack-artifact.ts
@@ -25,6 +25,7 @@ function runNpm(args: string[], stdio: "inherit" | "pipe" = "pipe"): string {
     cwd: ROOT,
     encoding: "utf8",
     stdio: stdio === "inherit" ? "inherit" : ["ignore", "pipe", "pipe"],
+    maxBuffer: 64 * 1024 * 1024,
   });
 }