feat(core): add OpenCode AI agent detection (#34072)

beaussan · web-flow · commit 21d1555d7819 · 2026-01-15T11:28:23.000-05:00
## Current Behavior

Nx's AI agent detection currently identifies Claude Code, Repl.it, and
Cursor AI agents via environment variables, but does not detect
OpenCode.

## Expected Behavior

Nx should also detect when running under OpenCode AI agent by checking
for the `OPENCODE` environment variable, which OpenCode sets to `1` when
active.

## Related Issue(s)

N/A - Feature addition to improve AI agent detection coverage.

## Changes

- Added `is_opencode_ai()` function in
`packages/nx/src/native/utils/ai.rs`
- Updated `is_ai_agent()` to include OpenCode detection
- Added corresponding unit tests
diff --git a/packages/nx/src/native/utils/ai.rs b/packages/nx/src/native/utils/ai.rs
@@ -42,10 +42,21 @@ fn is_cursor_ai() -> bool {
     is_cursor
 }
 
+/// Detects if the current process is being run by OpenCode
+fn is_opencode_ai() -> bool {
+    match env::var("OPENCODE") {
+        Ok(_) => {
+            debug!("OpenCode AI detected via OPENCODE environment variable");
+            true
+        }
+        Err(_) => false,
+    }
+}
+
 /// Detects if the current process is being run by an AI agent
 #[napi]
 pub fn is_ai_agent() -> bool {
-    let is_ai = is_claude_ai() || is_replit_ai() || is_cursor_ai();
+    let is_ai = is_claude_ai() || is_replit_ai() || is_cursor_ai() || is_opencode_ai();
 
     if is_ai {
         debug!("AI agent detected");
@@ -65,6 +76,7 @@ mod tests {
             "PAGER",
             "CURSOR_TRACE_ID",
             "COMPOSER_NO_INTERACTION",
+            "OPENCODE",
         ];
         for var in &ai_vars {
             unsafe {
@@ -81,6 +93,7 @@ mod tests {
         let original_pager = env::var("PAGER").ok();
         let original_cursor_trace_id = env::var("CURSOR_TRACE_ID").ok();
         let original_composer_no_interaction = env::var("COMPOSER_NO_INTERACTION").ok();
+        let original_opencode = env::var("OPENCODE").ok();
 
         // Start with clean environment
         clear_ai_env_vars();
@@ -98,6 +111,10 @@ mod tests {
             !is_cursor_ai(),
             "Should not detect Cursor AI without all variables"
         );
+        assert!(
+            !is_opencode_ai(),
+            "Should not detect OpenCode AI without OPENCODE"
+        );
         assert!(!is_ai_agent(), "Should not detect any AI agent");
 
         // Test Claude AI detection
@@ -120,6 +137,16 @@ mod tests {
             env::remove_var("REPL_ID");
         }
 
+        // Test OpenCode AI detection
+        unsafe {
+            env::set_var("OPENCODE", "1");
+        }
+        assert!(is_opencode_ai(), "Should detect OpenCode AI with OPENCODE");
+        assert!(is_ai_agent(), "Main function should detect OpenCode AI");
+        unsafe {
+            env::remove_var("OPENCODE");
+        }
+
         // Test Cursor AI detection with wrong PAGER
         unsafe {
             env::set_var("PAGER", "wrong-value");
@@ -179,5 +206,10 @@ mod tests {
                 env::set_var("COMPOSER_NO_INTERACTION", val);
             }
         }
+        if let Some(val) = original_opencode {
+            unsafe {
+                env::set_var("OPENCODE", val);
+            }
+        }
     }
 }
