diff --git a/test/shell.d/omarchycn-ai-test.sh b/test/shell.d/omarchycn-ai-test.sh
index 5fe2b1b2..e67ef5ed 100755
--- a/test/shell.d/omarchycn-ai-test.sh
+++ b/test/shell.d/omarchycn-ai-test.sh
@@ -110,8 +110,6 @@ class H(http.server.BaseHTTPRequestHandler):
             code = 200
         elif self.path == "/responses" and b"input" in body and b"messages" not in body:
             code = 200
-        elif self.path == "/chat/completions" and b"messages" in body:
-            code = 200
         else:
             code = 404
         self.send_response(code)
@@ -136,11 +134,18 @@ if OMARCHYCN_AI_TEST_BASE_URL="http://127.0.0.1:$port" omarchy-cn-ai-test good >
 fi
 pass "mock regression: 200 pass, 401 fail, responses path exercised"
 
-# ai-default merges into claude settings without clobbering user config
+# ai-default merges into claude settings without clobbering user config.
+# claude is absent; the install branch must run our omarchy-mise-install stub,
+# which "installs" the claude stub and leaves a marker.
+cat > "$TEST_HOME/stubs/omarchy-mise-install" <<STUB
+#!/bin/bash
+touch "$TEST_HOME/installer-ran"
 printf '#!/bin/bash
 exit 0
 ' > "$TEST_HOME/stubs/claude"
 chmod +x "$TEST_HOME/stubs/claude"
+STUB
+chmod +x "$TEST_HOME/stubs/omarchy-mise-install"
 echo "sk-secret-1" | omarchy-cn-ai-secret set deepseek > /dev/null
 mkdir -p "$HOME/.claude"
 printf '{"permissions":{"allow":["Bash"]},"env":{"KEEP":"1"}}' > "$HOME/.claude/settings.json"
@@ -150,4 +155,5 @@ omarchy-cn-ai-default good > /dev/null
 [[ $(jq -r '.env.ANTHROPIC_BASE_URL' "$HOME/.claude/settings.json") == "https://api.deepseek.com/anthropic" ]] || fail "ai-default env written"
 [[ $(cat "$HOME/.config/omarchy/defaults/agent") == claude ]] || fail "upstream default agent set"
 [[ $(stat -c %a "$HOME/.claude/settings.json") == 600 ]] || fail "claude settings 0600"
+[[ -f $TEST_HOME/installer-ran ]] || fail "missing harness triggered installer"
 pass "ai-default maps the profile onto the upstream agent entry"