diff --git a/config/build/env_vars.yaml b/config/build/env_vars.yaml
index 0b54277..6034aad 100644
--- a/config/build/env_vars.yaml
+++ b/config/build/env_vars.yaml
@@ -56,3 +56,15 @@ overrides:
   # at the script's already-cheap defaults (num_warmup=200, num_samples=500).
   - pattern: "searches/BlackJAXNUTS"
     unset: [PYAUTO_TEST_MODE, PYAUTO_DISABLE_JAX]
+  # MultiStartAdam is a JAX-native gradient MAP search that hard-raises when the
+  # analysis is not on the JAX backend. Under this profile's defaults it never
+  # reaches that guard: PYAUTO_TEST_MODE=2 bypasses the sampler before `_fit`
+  # runs, so the script passes without executing its JAX path at all — the
+  # backend regression it exists to catch went unnoticed here and surfaced only
+  # under mode=release. Run it for real (a jitted 3-parameter fit, ~6s) so the
+  # weekly mode=smoke workspace-validation sweep, which runs every script under
+  # this profile, actually exercises it. Note this profile does NOT feed the
+  # per-PR gate — that is the curated smoke_tests.txt list, which contains
+  # neither this script nor BlackJAXNUTS.
+  - pattern: "searches/MultiStartAdam"
+    unset: [PYAUTO_TEST_MODE, PYAUTO_DISABLE_JAX]
diff --git a/config/build/env_vars_release.yaml b/config/build/env_vars_release.yaml
index 0609d68..aa630f6 100644
--- a/config/build/env_vars_release.yaml
+++ b/config/build/env_vars_release.yaml
@@ -52,3 +52,17 @@ overrides:
   # already satisfied by defaults.
   - pattern: "searches/BlackJAXNUTS"
     set: { PYAUTO_DISABLE_JAX: "0" }
+  # MultiStartAdam is a JAX-native gradient MAP search (jax.vmap of
+  # jax.value_and_grad over the autofit Fitness). Unlike the samplers below it
+  # hard-raises when the analysis is not on the JAX backend, so the disabling
+  # default turned it into a release-validation failure the moment it landed.
+  - pattern: "searches/MultiStartAdam"
+    set: { PYAUTO_DISABLE_JAX: "0" }
+  # The *_jax sampler scripts exist to validate the JAX likelihood path. They
+  # carry no hard backend guard, so under the disabling default they silently
+  # validated the NumPy path and passed vacuously — the same failure mode the
+  # jax_assertions/ note above describes, minus the loud failure.
+  - pattern: "searches/Dynesty_jax"
+    set: { PYAUTO_DISABLE_JAX: "0" }
+  - pattern: "searches/Nautilus_jax"
+    set: { PYAUTO_DISABLE_JAX: "0" }