diff --git a/pyproject.toml b/pyproject.toml
index 9076760153a..c770bad7eb4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -236,6 +236,7 @@ dev = [
     "pytest-timeout==2.4.0",
     "vcrpy==8.2.1",
     "pytest-recording==0.13.4",
+    "tenacity==8.5.0",
 ]
 e2e-dev = [
     "playwright==1.61.0",
@@ -267,7 +268,6 @@ ci = [
     # These are lazily imported at call sites; keep them out of core deps to
     # avoid bloating the base SDK install (google-generativeai pulls grpcio +
     # protobuf, Pillow is a compiled C extension).
-    "tenacity==8.5.0",
     "google-generativeai==0.8.6",
     "Pillow==12.3.0; python_version == '3.10'",
     "Pillow==13.0.0; python_version >= '3.11'",
diff --git a/tests/AGENTS.md b/tests/AGENTS.md
index ac21776bdcc..72096c12396 100644
--- a/tests/AGENTS.md
+++ b/tests/AGENTS.md
@@ -32,6 +32,11 @@ behind an `if` (a poll that ends in `pytest.fail` is fine), `except Exception` a
 What the assertion depends on goes in the test. Everything else in conftest. A rate in a fixture three
 directories up makes a failed assertion unreadable. Extend the file that already covers the behaviour
 
+A module `make bootstrap` leaves out, meaning the `ci` group and the extras, is reached behind
+`pytest.importorskip("<module>", reason="<what needs it>")`. A bootstrapped worktree then skips the test
+instead of reporting a ModuleNotFoundError that reads like a real red. `make install-test-deps` installs
+every group and extra
+
 ## Writing it so a human can read it
 
 Name says what broke: `test_send_batched_with_valid_data` says nothing. Build, one call, assert, on one
diff --git a/uv.lock b/uv.lock
index 03403828225..01cb4df60a3 100644
--- a/uv.lock
+++ b/uv.lock
@@ -4788,7 +4788,6 @@ ci = [
     { name = "pylint" },
     { name = "pytest-codspeed" },
     { name = "pytest-retry" },
-    { name = "tenacity" },
     { name = "traceloop-sdk" },
 ]
 dev = [
@@ -4825,6 +4824,7 @@ dev = [
     { name = "responses" },
     { name = "respx" },
     { name = "ruff" },
+    { name = "tenacity" },
     { name = "tomli", marker = "python_full_version < '3.11'" },
     { name = "types-boto3", extra = ["bedrock", "bedrock-agent", "bedrock-runtime", "kms", "s3", "sagemaker-runtime", "sts"] },
     { name = "types-pyyaml" },
@@ -5011,7 +5011,6 @@ ci = [
     { name = "pylint", specifier = "==4.0.5" },
     { name = "pytest-codspeed", specifier = "==4.3.0" },
     { name = "pytest-retry", specifier = "==1.7.0" },
-    { name = "tenacity", specifier = "==8.5.0" },
     { name = "traceloop-sdk", specifier = "==0.34.0" },
 ]
 dev = [
@@ -5047,6 +5046,7 @@ dev = [
     { name = "responses", specifier = "==0.26.0" },
     { name = "respx", specifier = "==0.22.0" },
     { name = "ruff", specifier = "==0.15.3" },
+    { name = "tenacity", specifier = "==8.5.0" },
     { name = "tomli", marker = "python_full_version < '3.11'", specifier = "==2.4.1" },
     { name = "types-boto3", extras = ["bedrock", "bedrock-agent", "bedrock-runtime", "kms", "s3", "sagemaker-runtime", "sts"], specifier = "==1.43.30" },
     { name = "types-pyyaml", specifier = "==6.0.12.20250915" },