Fix tri-* CLI fallbacks: capture stderr instead of swallowing

commands/tri-debug.md

@@ -108,7 +108,7 @@ Retrieve result with `/gemini:result` when done. Omit `--model` to use the accou
 ```bash
 if [ "$HAS_GEMINI_CLI" = "yes" ]; then
   gemini -p "{prompt} {context}" -y \
-    --output-format text > /tmp/tri-debug-gemini.txt 2>/dev/null &
+    --output-format text > /tmp/tri-debug-gemini.txt 2>&1 &
   GEMINI_PID=$!
 fi
 

commands/tri-dispatch.md

@@ -86,7 +86,7 @@ Retrieve result with `/gemini:result` when done. Omit `--model` to use the accou
 ```bash
 if [ "$HAS_GEMINI_CLI" = "yes" ]; then
   gemini -p "$PROMPT" -y \
-    --output-format text > /tmp/tri-dispatch-gemini.txt 2>/dev/null &
+    --output-format text > /tmp/tri-dispatch-gemini.txt 2>&1 &
 fi
 
 wait

commands/tri-review.md

@@ -114,7 +114,7 @@ Retrieve result with `/codex:result` when done. Omit `--model` to use the accoun
 ```bash
 if [ "$HAS_CODEX_CLI" = "yes" ]; then
   codex exec --full-auto "{prompt} $(cat /tmp/tri-review-diff.txt)" \
-    > /tmp/tri-review-codex.txt 2>/dev/null &
+    > /tmp/tri-review-codex.txt 2>&1 &
   CODEX_PID=$!
 fi
 ```
@@ -136,7 +136,7 @@ Retrieve result with `/gemini:result` when done. Omit `--model` to use the accou
 if [ "$HAS_GEMINI_CLI" = "yes" ]; then
   gemini -p "{prompt} $(cat /tmp/tri-review-diff.txt)" \
     -y --output-format text \
-    > /tmp/tri-review-gemini.txt 2>/dev/null &
+    > /tmp/tri-review-gemini.txt 2>&1 &
   GEMINI_PID=$!
 fi
 
@@ -145,6 +145,21 @@ wait
 
 Note: Gemini CLI defaults to the best available model. Don't hardcode a model name — it may not be available on all accounts.
 
+### Post-dispatch validation
+
+After `wait`, check each CLI output file. If empty, report the failure instead of silently dropping the agent:
+
+```bash
+for agent_file in /tmp/tri-review-codex.txt /tmp/tri-review-gemini.txt; do
+  if [ -f "$agent_file" ] && [ ! -s "$agent_file" ]; then
+    agent=$(basename "$agent_file" | sed 's/tri-review-//;s/\.txt//')
+    echo "WARNING: $agent produced empty output — check CLI installation and authentication"
+  fi
+done
+```
+
+If an agent's output contains only stderr (error messages, not review content), note it in the consolidation as a failure rather than omitting it silently.
+
 ## Autonomy Flags
 
 | Agent | Method | Flags |

commands/tri-security.md

@@ -123,7 +123,7 @@ Retrieve result with `/gemini:result` when done. Omit `--model` to use the accou
 ```bash
 if [ "$HAS_GEMINI_CLI" = "yes" ]; then
   gemini -p "{prompt} $(cat /tmp/tri-security-diff.txt)" -y \
-    --output-format text > /tmp/tri-security-gemini.txt 2>/dev/null &
+    --output-format text > /tmp/tri-security-gemini.txt 2>&1 &
 fi
 
 wait

commands/tri-test-gen.md

@@ -102,7 +102,7 @@ Retrieve result with `/gemini:result` when done. Omit `--model` to use the accou
 ```bash
 if [ "$HAS_GEMINI_CLI" = "yes" ]; then
   gemini -p "{prompt} {source_code}" -y \
-    --output-format text > /tmp/tri-test-gemini.txt 2>/dev/null &
+    --output-format text > /tmp/tri-test-gemini.txt 2>&1 &
 fi
 
 wait