diff --git a/CHANGELOG.md b/CHANGELOG.md
index 57f6d3e..77eae75 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- **Qoder install/upgrade commands**
+  - Fixed exit status 127 error when running `agentpipe agents install qoder` or `agentpipe agents upgrade qoder`
+  - Changed from `bash --` to `bash -s --` in install/upgrade commands for proper stdin handling
+  - Updated commands: `curl -fsSL https://qoder.com/install | bash -s -- --force`
+  - Added test to verify bash command format in agent registry
+  - Fixes #26
+
 ## [0.5.5] - 2025-10-26
 
 ### Fixed
diff --git a/internal/registry/agents.json b/internal/registry/agents.json
index d7c0c64..c730e25 100644
--- a/internal/registry/agents.json
+++ b/internal/registry/agents.json
@@ -248,8 +248,8 @@
       "package_manager": "manifest",
       "package_name": "https://qoder-ide.oss-ap-southeast-1.aliyuncs.com/qodercli/channels/manifest.json",
       "install": {
-        "darwin": "curl -fsSL https://qoder.com/install | bash -- --force",
-        "linux": "curl -fsSL https://qoder.com/install | bash -- --force",
+        "darwin": "curl -fsSL https://qoder.com/install | bash -s -- --force",
+        "linux": "curl -fsSL https://qoder.com/install | bash -s -- --force",
         "windows": "See https://qoder.com/cli"
       },
       "uninstall": {
@@ -258,8 +258,8 @@
         "windows": "See https://qoder.com/cli for uninstall instructions"
       },
       "upgrade": {
-        "darwin": "curl -fsSL https://qoder.com/install | bash -- --force",
-        "linux": "curl -fsSL https://qoder.com/install | bash -- --force",
+        "darwin": "curl -fsSL https://qoder.com/install | bash -s -- --force",
+        "linux": "curl -fsSL https://qoder.com/install | bash -s -- --force",
         "windows": "See https://qoder.com/cli for upgrade instructions"
       },
       "requires_auth": true
diff --git a/internal/registry/registry_test.go b/internal/registry/registry_test.go
index a4bc7d1..28eed53 100644
--- a/internal/registry/registry_test.go
+++ b/internal/registry/registry_test.go
@@ -245,3 +245,43 @@ func verifyCommandMap(t *testing.T, commands map[string]string, cmdType, expecte
 func shouldSkipCommand(cmd string) bool {
 	return cmd == "" || (len(cmd) >= 3 && cmd[:3] == "See")
 }
+
+func TestQoderBashCommandFormat(t *testing.T) {
+	agent, err := GetByName("Qoder")
+	if err != nil {
+		t.Fatalf("Failed to get Qoder agent: %v", err)
+	}
+
+	// Test install commands
+	for os, cmd := range agent.Install {
+		verifyBashCommandFormat(t, "Install", os, cmd)
+	}
+
+	// Test upgrade commands
+	for os, cmd := range agent.Upgrade {
+		verifyBashCommandFormat(t, "Upgrade", os, cmd)
+	}
+}
+
+func verifyBashCommandFormat(t *testing.T, cmdType, os, cmd string) {
+	t.Helper()
+	if shouldSkipCommand(cmd) {
+		return
+	}
+	// Only check piped bash commands
+	if !strings.Contains(cmd, "|") || !strings.Contains(cmd, "bash") {
+		return
+	}
+
+	// Extract what comes after "bash" in the command
+	bashIndex := strings.Index(cmd, "bash")
+	afterBash := cmd[bashIndex+4:] // Everything after "bash"
+	afterBash = strings.TrimSpace(afterBash)
+
+	// If there are arguments after bash (starts with -- or -), require -s flag
+	if len(afterBash) > 0 && (strings.HasPrefix(afterBash, "--") || strings.HasPrefix(afterBash, "-")) {
+		if !strings.Contains(cmd, "bash -s") {
+			t.Errorf("%s command for %s passes arguments to bash without '-s' flag: %s\nWhen passing arguments to a piped script, use 'bash -s -- <args>' instead of 'bash -- <args>'", cmdType, os, cmd)
+		}
+	}
+}