diff --git a/.github/workflows/security-guard.lock.yml b/.github/workflows/security-guard.lock.yml
index 82c65d1e33c..8edc65703ea 100644
--- a/.github/workflows/security-guard.lock.yml
+++ b/.github/workflows/security-guard.lock.yml
@@ -21,7 +21,7 @@
 #
 # Automated security guard that reviews every PR for changes that could weaken security posture, only commenting when concrete evidence of security concerns exists
 #
-# frontmatter-hash: 59dc5fe139727fe114dbdf8839d0b27611f7beb7352c97aaa83ddd4782446d83
+# frontmatter-hash: 16e82d336fc3b4127b2581c8c63995bb988266d160101e474a909c95e2eba610
 
 name: "Security Guard Agent 🛡️"
 "on":
@@ -410,7 +410,7 @@ jobs:
             const awInfo = {
               engine_id: "copilot",
               engine_name: "GitHub Copilot CLI",
-              model: process.env.GH_AW_MODEL_AGENT_COPILOT || "",
+              model: "gpt-5.1-codex-mini",
               version: "",
               agent_version: "0.0.397",
               workflow_name: "Security Guard Agent 🛡️",
@@ -575,13 +575,12 @@ jobs:
           GH_AW_TOOL_BINS=""; command -v go >/dev/null 2>&1 && GH_AW_TOOL_BINS="$(go env GOROOT)/bin:$GH_AW_TOOL_BINS"; [ -n "$JAVA_HOME" ] && GH_AW_TOOL_BINS="$JAVA_HOME/bin:$GH_AW_TOOL_BINS"; [ -n "$CARGO_HOME" ] && GH_AW_TOOL_BINS="$CARGO_HOME/bin:$GH_AW_TOOL_BINS"; [ -n "$GEM_HOME" ] && GH_AW_TOOL_BINS="$GEM_HOME/bin:$GH_AW_TOOL_BINS"; [ -n "$CONDA" ] && GH_AW_TOOL_BINS="$CONDA/bin:$GH_AW_TOOL_BINS"; [ -n "$PIPX_BIN_DIR" ] && GH_AW_TOOL_BINS="$PIPX_BIN_DIR:$GH_AW_TOOL_BINS"; [ -n "$SWIFT_PATH" ] && GH_AW_TOOL_BINS="$SWIFT_PATH:$GH_AW_TOOL_BINS"; [ -n "$DOTNET_ROOT" ] && GH_AW_TOOL_BINS="$DOTNET_ROOT:$GH_AW_TOOL_BINS"; export GH_AW_TOOL_BINS
           mkdir -p "$HOME/.cache"
           sudo -E awf --env-all --env "ANDROID_HOME=${ANDROID_HOME}" --env "ANDROID_NDK=${ANDROID_NDK}" --env "ANDROID_NDK_HOME=${ANDROID_NDK_HOME}" --env "ANDROID_NDK_LATEST_HOME=${ANDROID_NDK_LATEST_HOME}" --env "ANDROID_NDK_ROOT=${ANDROID_NDK_ROOT}" --env "ANDROID_SDK_ROOT=${ANDROID_SDK_ROOT}" --env "AZURE_EXTENSION_DIR=${AZURE_EXTENSION_DIR}" --env "CARGO_HOME=${CARGO_HOME}" --env "CHROMEWEBDRIVER=${CHROMEWEBDRIVER}" --env "CONDA=${CONDA}" --env "DOTNET_ROOT=${DOTNET_ROOT}" --env "EDGEWEBDRIVER=${EDGEWEBDRIVER}" --env "GECKOWEBDRIVER=${GECKOWEBDRIVER}" --env "GEM_HOME=${GEM_HOME}" --env "GEM_PATH=${GEM_PATH}" --env "GOPATH=${GOPATH}" --env "GOROOT=${GOROOT}" --env "HOMEBREW_CELLAR=${HOMEBREW_CELLAR}" --env "HOMEBREW_PREFIX=${HOMEBREW_PREFIX}" --env "HOMEBREW_REPOSITORY=${HOMEBREW_REPOSITORY}" --env "JAVA_HOME=${JAVA_HOME}" --env "JAVA_HOME_11_X64=${JAVA_HOME_11_X64}" --env "JAVA_HOME_17_X64=${JAVA_HOME_17_X64}" --env "JAVA_HOME_21_X64=${JAVA_HOME_21_X64}" --env "JAVA_HOME_25_X64=${JAVA_HOME_25_X64}" --env "JAVA_HOME_8_X64=${JAVA_HOME_8_X64}" --env "NVM_DIR=${NVM_DIR}" --env "PIPX_BIN_DIR=${PIPX_BIN_DIR}" --env "PIPX_HOME=${PIPX_HOME}" --env "RUSTUP_HOME=${RUSTUP_HOME}" --env "SELENIUM_JAR_PATH=${SELENIUM_JAR_PATH}" --env "SWIFT_PATH=${SWIFT_PATH}" --env "VCPKG_INSTALLATION_ROOT=${VCPKG_INSTALLATION_ROOT}" --env "GH_AW_TOOL_BINS=$GH_AW_TOOL_BINS" --container-workdir "${GITHUB_WORKSPACE}" --mount /tmp:/tmp:rw --mount "${HOME}/.cache:${HOME}/.cache:rw" --mount "${GITHUB_WORKSPACE}:${GITHUB_WORKSPACE}:rw" --mount /usr/bin/cat:/usr/bin/cat:ro --mount /usr/bin/curl:/usr/bin/curl:ro --mount /usr/bin/date:/usr/bin/date:ro --mount /usr/bin/find:/usr/bin/find:ro --mount /usr/bin/gh:/usr/bin/gh:ro --mount /usr/bin/grep:/usr/bin/grep:ro --mount /usr/bin/jq:/usr/bin/jq:ro --mount /usr/bin/yq:/usr/bin/yq:ro --mount /usr/bin/cp:/usr/bin/cp:ro --mount /usr/bin/cut:/usr/bin/cut:ro --mount /usr/bin/diff:/usr/bin/diff:ro --mount /usr/bin/head:/usr/bin/head:ro --mount /usr/bin/ls:/usr/bin/ls:ro --mount /usr/bin/mkdir:/usr/bin/mkdir:ro --mount /usr/bin/rm:/usr/bin/rm:ro --mount /usr/bin/sed:/usr/bin/sed:ro --mount /usr/bin/sort:/usr/bin/sort:ro --mount /usr/bin/tail:/usr/bin/tail:ro --mount /usr/bin/wc:/usr/bin/wc:ro --mount /usr/bin/which:/usr/bin/which:ro --mount /usr/local/bin/copilot:/usr/local/bin/copilot:ro --mount /home/runner/.copilot:/home/runner/.copilot:rw --mount /opt/hostedtoolcache:/opt/hostedtoolcache:ro --mount /opt/gh-aw:/opt/gh-aw:ro --allow-domains api.business.githubcopilot.com,api.enterprise.githubcopilot.com,api.github.com,api.githubcopilot.com,api.individual.githubcopilot.com,api.snapcraft.io,archive.ubuntu.com,azure.archive.ubuntu.com,crl.geotrust.com,crl.globalsign.com,crl.identrust.com,crl.sectigo.com,crl.thawte.com,crl.usertrust.com,crl.verisign.com,crl3.digicert.com,crl4.digicert.com,crls.ssl.com,github.com,host.docker.internal,json-schema.org,json.schemastore.org,keyserver.ubuntu.com,ocsp.digicert.com,ocsp.geotrust.com,ocsp.globalsign.com,ocsp.identrust.com,ocsp.sectigo.com,ocsp.ssl.com,ocsp.thawte.com,ocsp.usertrust.com,ocsp.verisign.com,packagecloud.io,packages.cloud.google.com,packages.microsoft.com,ppa.launchpad.net,raw.githubusercontent.com,registry.npmjs.org,s.symcb.com,s.symcd.com,security.ubuntu.com,ts-crl.ws.symantec.com,ts-ocsp.ws.symantec.com --log-level info --proxy-logs-dir /tmp/gh-aw/sandbox/firewall/logs --enable-host-access --image-tag 0.11.2 --agent-image act \
-            -- 'source /opt/gh-aw/actions/sanitize_path.sh "$GH_AW_TOOL_BINS$(find /opt/hostedtoolcache -maxdepth 4 -type d -name bin 2>/dev/null | tr '\''\n'\'' '\'':'\'')$PATH" && /usr/local/bin/copilot --add-dir /tmp/gh-aw/ --log-level all --log-dir /tmp/gh-aw/sandbox/agent/logs/ --add-dir "${GITHUB_WORKSPACE}" --disable-builtin-mcps --allow-all-tools --allow-all-paths --share /tmp/gh-aw/sandbox/agent/logs/conversation.md --prompt "$(cat /tmp/gh-aw/aw-prompts/prompt.txt)"${GH_AW_MODEL_AGENT_COPILOT:+ --model "$GH_AW_MODEL_AGENT_COPILOT"}' \
+            -- 'source /opt/gh-aw/actions/sanitize_path.sh "$GH_AW_TOOL_BINS$(find /opt/hostedtoolcache -maxdepth 4 -type d -name bin 2>/dev/null | tr '\''\n'\'' '\'':'\'')$PATH" && /usr/local/bin/copilot --add-dir /tmp/gh-aw/ --log-level all --log-dir /tmp/gh-aw/sandbox/agent/logs/ --add-dir "${GITHUB_WORKSPACE}" --disable-builtin-mcps --model gpt-5.1-codex-mini --allow-all-tools --allow-all-paths --share /tmp/gh-aw/sandbox/agent/logs/conversation.md --prompt "$(cat /tmp/gh-aw/aw-prompts/prompt.txt)"' \
             2>&1 | tee /tmp/gh-aw/agent-stdio.log
         env:
           COPILOT_AGENT_RUNNER_TYPE: STANDALONE
           COPILOT_GITHUB_TOKEN: ${{ secrets.COPILOT_GITHUB_TOKEN }}
           GH_AW_MCP_CONFIG: /home/runner/.copilot/mcp-config.json
-          GH_AW_MODEL_AGENT_COPILOT: ${{ vars.GH_AW_MODEL_AGENT_COPILOT || '' }}
           GH_AW_PROMPT: /tmp/gh-aw/aw-prompts/prompt.txt
           GH_AW_SAFE_OUTPUTS: ${{ env.GH_AW_SAFE_OUTPUTS }}
           GITHUB_HEAD_REF: ${{ github.head_ref }}
@@ -943,11 +942,10 @@ jobs:
           mkdir -p /tmp/gh-aw/
           mkdir -p /tmp/gh-aw/agent/
           mkdir -p /tmp/gh-aw/sandbox/agent/logs/
-          copilot --add-dir /tmp/ --add-dir /tmp/gh-aw/ --add-dir /tmp/gh-aw/agent/ --log-level all --log-dir /tmp/gh-aw/sandbox/agent/logs/ --disable-builtin-mcps --allow-tool 'shell(cat)' --allow-tool 'shell(grep)' --allow-tool 'shell(head)' --allow-tool 'shell(jq)' --allow-tool 'shell(ls)' --allow-tool 'shell(tail)' --allow-tool 'shell(wc)' --share /tmp/gh-aw/sandbox/agent/logs/conversation.md --prompt "$COPILOT_CLI_INSTRUCTION"${GH_AW_MODEL_DETECTION_COPILOT:+ --model "$GH_AW_MODEL_DETECTION_COPILOT"} 2>&1 | tee /tmp/gh-aw/threat-detection/detection.log
+          copilot --add-dir /tmp/ --add-dir /tmp/gh-aw/ --add-dir /tmp/gh-aw/agent/ --log-level all --log-dir /tmp/gh-aw/sandbox/agent/logs/ --disable-builtin-mcps --model gpt-5.1-codex-mini --allow-tool 'shell(cat)' --allow-tool 'shell(grep)' --allow-tool 'shell(head)' --allow-tool 'shell(jq)' --allow-tool 'shell(ls)' --allow-tool 'shell(tail)' --allow-tool 'shell(wc)' --share /tmp/gh-aw/sandbox/agent/logs/conversation.md --prompt "$COPILOT_CLI_INSTRUCTION" 2>&1 | tee /tmp/gh-aw/threat-detection/detection.log
         env:
           COPILOT_AGENT_RUNNER_TYPE: STANDALONE
           COPILOT_GITHUB_TOKEN: ${{ secrets.COPILOT_GITHUB_TOKEN }}
-          GH_AW_MODEL_DETECTION_COPILOT: ${{ vars.GH_AW_MODEL_DETECTION_COPILOT || '' }}
           GH_AW_PROMPT: /tmp/gh-aw/aw-prompts/prompt.txt
           GITHUB_HEAD_REF: ${{ github.head_ref }}
           GITHUB_REF_NAME: ${{ github.ref_name }}
@@ -1019,6 +1017,7 @@ jobs:
     timeout-minutes: 15
     env:
       GH_AW_ENGINE_ID: "copilot"
+      GH_AW_ENGINE_MODEL: "gpt-5.1-codex-mini"
       GH_AW_SAFE_OUTPUT_MESSAGES: "{\"footer\":\"\\u003e 🛡️ *Security posture analysis by [{workflow_name}]({run_url})*\",\"runStarted\":\"🔒 [{workflow_name}]({run_url}) is analyzing this pull request for security posture changes...\",\"runSuccess\":\"🛡️ [{workflow_name}]({run_url}) completed security posture analysis.\",\"runFailure\":\"⚠️ [{workflow_name}]({run_url}) {status} during security analysis.\"}"
       GH_AW_WORKFLOW_ID: "security-guard"
       GH_AW_WORKFLOW_NAME: "Security Guard Agent 🛡️"
diff --git a/.github/workflows/security-guard.md b/.github/workflows/security-guard.md
index 93a24f2459b..3e4328e4cf8 100644
--- a/.github/workflows/security-guard.md
+++ b/.github/workflows/security-guard.md
@@ -9,6 +9,9 @@ permissions:
   pull-requests: read
   actions: read
   security-events: read
+engine:
+  id: copilot
+  model: gpt-5.1-codex-mini
 tools:
   github:
     toolsets: [repos, pull_requests, code_security]