diff --git a/.github/workflows/apk.yml b/.github/workflows/apk.yml
index 49e378fb..15289659 100644
--- a/.github/workflows/apk.yml
+++ b/.github/workflows/apk.yml
@@ -106,7 +106,6 @@ jobs:
           -Pmobilegl.apkSuffix="${GITHUB_SHA}" -Pmobilegl.logLevel=MOBILEGL_LOG_LEVEL_INFO
           -Pmobilegl.buildDisaggregated="${MOBILEGL_CI_DISAGGREGATED}"
           -Pmobilegl.buildDisaggregatedInproc="${MOBILEGL_CI_DISAGGREGATED}"
-          -Pmobilegl.pipePush="${MOBILEGL_CI_DISAGGREGATED}"
           --parallel --max-workers "$(nproc)"
         env:
           SIGNING_STORE_PASSWORD: ${{ secrets.SIGNING_STORE_PASSWORD }}
@@ -155,7 +154,6 @@ jobs:
           -Pmobilegl.debuggableRelease=true -Pmobilegl.logLevel=MOBILEGL_LOG_LEVEL_INFO
           -Pmobilegl.buildDisaggregated="${MOBILEGL_CI_DISAGGREGATED}"
           -Pmobilegl.buildDisaggregatedInproc="${MOBILEGL_CI_DISAGGREGATED}"
-          -Pmobilegl.pipePush="${MOBILEGL_CI_DISAGGREGATED}"
           --parallel --max-workers "$(nproc)"
         env:
           SIGNING_STORE_PASSWORD: ${{ secrets.SIGNING_STORE_PASSWORD }}
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1329f9f4..0a4c900e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,10 +31,10 @@ option(MOBILEGL_BUILD_DISAGGREGATED_INPROC "Compile the in-process (one-process,
 option(MOBILEGL_BUILD_SERVER_SPIKE "Build the P0 spike-A MobileGLServer delivery-chain executable (Android only)" OFF)
 option(MOBILEGL_BUILD_EXTMEM_PROBE "Package tools/spikes/extmem_probe as libMobileGLExtmemProbe.so for the trace APK's exec hook (P11 A3, Android only)" OFF)
 option(MOBILEGL_EXTMEM_PROBE_AS_SERVER "Spike only (P11 B2 step 1): also package the probe as libMobileGLServer.so, the real server as libMobileGLServerReal.so" OFF)
-# The PipeInputs strangler (ARCHITECTURE.md 9.2). OFF is the pull build and must stay
-# byte-identical to a tree without either option: MGB_CTX is the live GLContext, no
-# MGPipe/PipeInputs source is compiled, every MGP_FILL is ((void)0).
-option(MOBILEGL_PIPE_PUSH "Backends read frontend state through the MGPipe PipeInputs block instead of MG_State::pGLContext (ARCHITECTURE.md 9.2 phase A)" OFF)
+# The PipeInputs strangler (ARCHITECTURE.md 9.2). ON since P13 W2: every build, the FCL-embedded
+# monolith included, pushes. OFF is the retired pull build, kept selectable only until P13 W3a
+# deletes the option (PLAN-P13 §6); nothing ships it and CI no longer builds it.
+option(MOBILEGL_PIPE_PUSH "Backends read frontend state through the MGPipe PipeInputs block instead of MG_State::pGLContext (ARCHITECTURE.md 9.2 phase A)" ON)
 option(MOBILEGL_PIPE_VERIFY "Compile SnapshotFromGLContext() and the G4 per-verb shadow comparator; implies MOBILEGL_PIPE_PUSH; never shipped" OFF)
 # Track H's old-versus-new arm (ARCHITECTURE.md 9.6). With a MOBILEGL_PIPE_PUSH bit clear
 # the backend would still run the RE-KEYED memo code, so the bitmask alone stops being a
diff --git a/build.gradle b/build.gradle
index 8628c907..4f10a110 100644
--- a/build.gradle
+++ b/build.gradle
@@ -39,12 +39,9 @@ def mobileGlExtmemProbeAsServer = {
 // build ship it, so there the split shape is ON unless a build opts out with
 // -Pmobilegl.buildDisaggregated=OFF. The runtime transport is unaffected: the app's
 // MOBILEGL_TRANSPORT env stays opt-in (app/build.gradle.kts), so the monolith path is still the
-// default. The FCL-embedded library keeps its old defaults (pull, no MG_Remote): FCL packages
-// neither the server nor its screen.
-// Disaggregated CI explicitly selects all three switches.
-def mobileGlPipePush = {
-    (rootProject.findProperty('mobilegl.pipePush') ?: System.getenv('MOBILEGL_PIPE_PUSH_APK') ?: 'OFF') as String
-}
+// default. The FCL-embedded library is the push monolith without MG_Remote (P13 W2, ID-P13-1):
+// FCL packages neither the server nor its screen. The pipe is always pushed, so there is no
+// pipePush switch any more; disaggregated CI selects the two transport switches.
 def mobileGlBuildDisaggregated = {
     (rootProject.findProperty('mobilegl.buildDisaggregated') ?: System.getenv('MOBILEGL_BUILD_DISAGGREGATED') ?: (standalonePluginBuild ? 'ON' : 'OFF')) as String
 }
@@ -76,7 +73,6 @@ android {
             cmake {
                 arguments "-DMOBILEGL_LOG_ACTIVE_LEVEL=${mobileGlLogActiveLevel()}"
                 arguments '-DCMAKE_EXPORT_COMPILE_COMMANDS=ON'
-                arguments "-DMOBILEGL_PIPE_PUSH=${mobileGlPipePush()}"
                 arguments "-DMOBILEGL_BUILD_DISAGGREGATED=${mobileGlBuildDisaggregated()}"
                 arguments "-DMOBILEGL_BUILD_DISAGGREGATED_INPROC=${mobileGlBuildDisaggregatedInproc()}"
             }