diff --git a/src-tauri/src/commands/acp.rs b/src-tauri/src/commands/acp.rs
index ae6231e..145b9d9 100644
--- a/src-tauri/src/commands/acp.rs
+++ b/src-tauri/src/commands/acp.rs
@@ -85,15 +85,45 @@ fn is_cmd_available(cmd: &str) -> bool {
     which::which(cmd).is_ok()
 }
 
+/// Detect the actual installed version of an npm global package by running
+/// `npm list -g <package_name> --json` and parsing the JSON output.
+async fn detect_npm_global_version(package_name: &str) -> Option<String> {
+    let npm_path = which::which("npm").ok()?;
+    let output = crate::process::tokio_command(npm_path)
+        .arg("list")
+        .arg("-g")
+        .arg(package_name)
+        .arg("--json")
+        .arg("--depth=0")
+        .output()
+        .await
+        .ok()?;
+    // npm list --json may exit non-zero when package is missing, but still
+    // outputs valid JSON with an empty dependencies object.
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    let json: serde_json::Value = serde_json::from_str(&stdout).ok()?;
+    let version = json
+        .get("dependencies")?
+        .get(package_name)?
+        .get("version")?
+        .as_str()?;
+    normalize_version_candidate(version)
+}
+
 async fn detect_local_version(agent_type: AgentType) -> Option<String> {
     let meta = registry::get_agent_meta(agent_type);
     match meta.distribution {
         registry::AgentDistribution::Npx { cmd, package, .. } => {
-            if is_cmd_available(cmd) {
-                version_from_package_spec(package)
-            } else {
-                None
+            if !is_cmd_available(cmd) {
+                return None;
             }
+            // Try `npm list -g <package_name> --json` to get the real installed version.
+            let pkg_name = package_name_from_spec(package);
+            if let Some(v) = detect_npm_global_version(&pkg_name).await {
+                return Some(v);
+            }
+            // Fallback: parse version from registry package spec
+            version_from_package_spec(package)
         }
         registry::AgentDistribution::Binary { cmd, .. } => {
             binary_cache::detect_installed_version(agent_type, cmd)