diff --git a/surfsense_backend/tests/unit/automations/__init__.py b/surfsense_backend/tests/unit/automations/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/surfsense_backend/tests/unit/automations/conftest.py b/surfsense_backend/tests/unit/automations/conftest.py
new file mode 100644
index 000000000..0fbf03234
--- /dev/null
+++ b/surfsense_backend/tests/unit/automations/conftest.py
@@ -0,0 +1,39 @@
+"""Shared fixtures for the ``app.automations`` unit-test tree.
+
+Provides registry isolation: the built-in ``schedule`` trigger and
+``agent_task`` action self-register at import time. Tests that register
+additional triggers/actions (or assert on the registry contents) must
+not leak that state to other tests. These fixtures snapshot and restore
+the module-level registry dicts.
+"""
+
+from __future__ import annotations
+
+from collections.abc import Iterator
+
+import pytest
+
+from app.automations.actions import store as action_store
+from app.automations.triggers import store as trigger_store
+
+
+@pytest.fixture
+def isolated_action_registry() -> Iterator[None]:
+    """Snapshot and restore the action registry around a test."""
+    snapshot = dict(action_store._REGISTRY)
+    try:
+        yield
+    finally:
+        action_store._REGISTRY.clear()
+        action_store._REGISTRY.update(snapshot)
+
+
+@pytest.fixture
+def isolated_trigger_registry() -> Iterator[None]:
+    """Snapshot and restore the trigger registry around a test."""
+    snapshot = dict(trigger_store._REGISTRY)
+    try:
+        yield
+    finally:
+        trigger_store._REGISTRY.clear()
+        trigger_store._REGISTRY.update(snapshot)
diff --git a/surfsense_backend/tests/unit/automations/test_definition_types.py b/surfsense_backend/tests/unit/automations/test_definition_types.py
new file mode 100644
index 000000000..231e4fa97
--- /dev/null
+++ b/surfsense_backend/tests/unit/automations/test_definition_types.py
@@ -0,0 +1,56 @@
+"""Lock the ``params_schema`` derivation on action + trigger definitions.
+
+Both definition dataclasses expose ``params_schema`` as the JSON Schema
+of their ``params_model``. This is what the registry endpoints surface
+to the UI as the "what shape do these params take?" contract.
+"""
+
+from __future__ import annotations
+
+import pytest
+from pydantic import BaseModel
+
+from app.automations.actions.types import ActionDefinition
+from app.automations.triggers.types import TriggerDefinition
+
+pytestmark = pytest.mark.unit
+
+
+class _Topic(BaseModel):
+    """Model with one required string field — minimal schema fingerprint."""
+
+    topic: str
+
+
+def test_action_definition_params_schema_reflects_params_model() -> None:
+    """``ActionDefinition.params_schema`` returns a JSON Schema derived
+    from the Pydantic ``params_model`` — required fields and types are
+    visible to clients consuming the registry endpoint."""
+    definition = ActionDefinition(
+        type="t",
+        name="N",
+        description="D",
+        params_model=_Topic,
+        build_handler=lambda _ctx: (lambda _p: {}),  # type: ignore[arg-type,return-value]
+    )
+
+    schema = definition.params_schema
+
+    assert schema["type"] == "object"
+    assert schema["properties"]["topic"]["type"] == "string"
+    assert "topic" in schema["required"]
+
+
+def test_trigger_definition_params_schema_reflects_params_model() -> None:
+    """Same JSON-Schema derivation contract on the trigger side."""
+    definition = TriggerDefinition(
+        type="t",
+        description="D",
+        params_model=_Topic,
+    )
+
+    schema = definition.params_schema
+
+    assert schema["type"] == "object"
+    assert schema["properties"]["topic"]["type"] == "string"
+    assert "topic" in schema["required"]
diff --git a/surfsense_backend/tests/unit/automations/test_import_registrations.py b/surfsense_backend/tests/unit/automations/test_import_registrations.py
new file mode 100644
index 000000000..35b1effa7
--- /dev/null
+++ b/surfsense_backend/tests/unit/automations/test_import_registrations.py
@@ -0,0 +1,37 @@
+"""Lock the bundled import side-effects.
+
+Importing ``app.automations`` (the package) registers the v1 bundled
+action (``agent_task``) and the v1 bundled trigger (``schedule``). If the
+import chain breaks (e.g. someone removes ``from . import definition``
+in a sub-package ``__init__``), the system would silently launch with an
+empty registry. These tests are the canary.
+"""
+
+from __future__ import annotations
+
+import pytest
+
+import app.automations  # noqa: F401  (force the package import + its side-effects)
+from app.automations.actions.store import get_action
+from app.automations.persistence.enums.trigger_type import TriggerType
+from app.automations.triggers.store import get_trigger
+
+pytestmark = pytest.mark.unit
+
+
+def test_bundled_agent_task_action_is_registered_after_package_import() -> None:
+    """``agent_task`` — the v1 default action — must be discoverable in
+    the registry after the package is imported."""
+    definition = get_action("agent_task")
+
+    assert definition is not None
+    assert definition.type == "agent_task"
+
+
+def test_bundled_schedule_trigger_is_registered_after_package_import() -> None:
+    """``schedule`` — the only v1 trigger — must be discoverable in the
+    registry after the package is imported."""
+    definition = get_trigger(TriggerType.SCHEDULE.value)
+
+    assert definition is not None
+    assert definition.type == TriggerType.SCHEDULE.value
diff --git a/surfsense_backend/tests/unit/automations/test_persistence_enums.py b/surfsense_backend/tests/unit/automations/test_persistence_enums.py
new file mode 100644
index 000000000..59703dfc6
--- /dev/null
+++ b/surfsense_backend/tests/unit/automations/test_persistence_enums.py
@@ -0,0 +1,45 @@
+"""Lock the persistence enum string values + members.
+
+These enums are mirrored by Postgres enum types, embedded in stored DB
+rows, and surfaced in the JSON API. Renaming a value (or removing a
+member) silently breaks production data and previously-issued API
+responses, so the strings + the set of members are the contract.
+"""
+
+from __future__ import annotations
+
+import pytest
+
+from app.automations.persistence.enums.automation_status import AutomationStatus
+from app.automations.persistence.enums.run_status import RunStatus
+from app.automations.persistence.enums.trigger_type import TriggerType
+
+pytestmark = pytest.mark.unit
+
+
+def test_automation_status_string_values_are_stable() -> None:
+    """The exact strings persisted to Postgres and served in API JSON."""
+    assert {member.value for member in AutomationStatus} == {
+        "active",
+        "paused",
+        "archived",
+    }
+
+
+def test_run_status_string_values_are_stable() -> None:
+    """Run lifecycle states embedded in the ``automation_runs`` table."""
+    assert {member.value for member in RunStatus} == {
+        "pending",
+        "running",
+        "succeeded",
+        "failed",
+        "cancelled",
+        "timed_out",
+    }
+
+
+def test_trigger_type_keeps_manual_member_even_though_unregistered() -> None:
+    """``MANUAL`` is reserved (mirrors the Postgres enum) but the trigger
+    store does not register it in v1. The enum must keep both members so
+    existing DB rows and the schema migration plan stay valid."""
+    assert {member.value for member in TriggerType} == {"schedule", "manual"}
diff --git a/surfsense_backend/tests/unit/automations/test_stores.py b/surfsense_backend/tests/unit/automations/test_stores.py
new file mode 100644
index 000000000..e54062d64
--- /dev/null
+++ b/surfsense_backend/tests/unit/automations/test_stores.py
@@ -0,0 +1,115 @@
+"""Lock the trigger + action registry contracts.
+
+Both stores share the same API shape (register/get/all + duplicate-raise),
+so they're tested together to keep the contract visible side-by-side.
+"""
+
+from __future__ import annotations
+
+import pytest
+from pydantic import BaseModel
+
+from app.automations.actions.store import (
+    get_action,
+    register_action,
+)
+from app.automations.actions.types import ActionDefinition
+from app.automations.triggers.store import (
+    all_triggers,
+    get_trigger,
+    register_trigger,
+)
+from app.automations.triggers.types import TriggerDefinition
+
+pytestmark = pytest.mark.unit
+
+
+class _Params(BaseModel):
+    """Empty params model used by test-only registrations."""
+
+
+def _trigger(type_: str = "test_trigger") -> TriggerDefinition:
+    return TriggerDefinition(type=type_, description="Test trigger.", params_model=_Params)
+
+
+def _action(type_: str = "test_action") -> ActionDefinition:
+    return ActionDefinition(
+        type=type_,
+        name="Test",
+        description="Test action.",
+        params_model=_Params,
+        build_handler=lambda _ctx: (lambda _p: {}),  # type: ignore[arg-type,return-value]
+    )
+
+
+def test_register_trigger_then_get_trigger_returns_the_same_definition(
+    isolated_trigger_registry: None,
+) -> None:
+    """The canonical round-trip: register, look up by type, get the same
+    definition back. Locks the basic registry contract."""
+    definition = _trigger()
+    register_trigger(definition)
+
+    assert get_trigger("test_trigger") is definition
+
+
+def test_register_action_then_get_action_returns_the_same_definition(
+    isolated_action_registry: None,
+) -> None:
+    """Same round-trip contract for the action registry."""
+    definition = _action()
+    register_action(definition)
+
+    assert get_action("test_action") is definition
+
+
+def test_get_trigger_returns_none_for_unknown_type(
+    isolated_trigger_registry: None,
+) -> None:
+    """An unknown type returns ``None`` (not raises). Lets callers like
+    the dispatcher branch on "is this trigger still registered?" without
+    try/except."""
+    assert get_trigger("never_registered") is None
+
+
+def test_get_action_returns_none_for_unknown_type(
+    isolated_action_registry: None,
+) -> None:
+    """Same ``None``-not-raise contract on the action side."""
+    assert get_action("never_registered") is None
+
+
+def test_register_trigger_rejects_duplicate_type(
+    isolated_trigger_registry: None,
+) -> None:
+    """Re-registering the same ``type`` raises rather than silently
+    overwriting. Locks the safety net against accidental double-import
+    (e.g., circular imports re-running the registration block)."""
+    register_trigger(_trigger())
+
+    with pytest.raises(ValueError, match="test_trigger"):
+        register_trigger(_trigger())
+
+
+def test_register_action_rejects_duplicate_type(
+    isolated_action_registry: None,
+) -> None:
+    """Same duplicate-rejection contract on the action side."""
+    register_action(_action())
+
+    with pytest.raises(ValueError, match="test_action"):
+        register_action(_action())
+
+
+def test_all_triggers_returns_defensive_snapshot(
+    isolated_trigger_registry: None,
+) -> None:
+    """``all_triggers()`` returns a copy: mutating the returned dict does
+    not corrupt the internal registry. Locks the snapshot contract that
+    UI/listing endpoints rely on."""
+    register_trigger(_trigger("snapshot_test"))
+
+    snapshot = all_triggers()
+    snapshot.pop("snapshot_test")
+
+    assert get_trigger("snapshot_test") is not None
\ No newline at end of file