diff --git a/README.md b/README.md
index fd757dd..2fa60f8 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,7 @@ deliberately declines) is documented in [SEAMS.md](./SEAMS.md).
   contract in the manifest) when cards are due, and a desktop wake triggers a
   due check via the lifecycle-hook seam.
 
-Storage is instance-scoped SQLite (`instance_paths().store("learning_wiki")`),
+Storage is instance-scoped SQLite (`sdk.plugin_store(plugin_id="learning_wiki")`),
 no runtime pip deps; the FSRS-4.5 scheduler is pure Python with the published
 default weights (overridable via config).
 
diff --git a/__init__.py b/__init__.py
index 6df3df8..fbdbb49 100644
--- a/__init__.py
+++ b/__init__.py
@@ -25,12 +25,11 @@ def _data_dir(cfg: dict) -> Path:
     if override:
         p = Path(override).expanduser()
     else:
-        try:
-            from infra.paths import instance_paths  # host-only; lazy by design
+        # Lazy so the package stays importable in its host-free test suite. The
+        # manifest's v0.148 floor guarantees this seam in a real host.
+        from graph import sdk
 
-            p = instance_paths().store("learning_wiki")
-        except Exception:  # noqa: BLE001 — standalone / tests / older host
-            p = Path.home() / ".protoagent" / "learning_wiki"
+        p = sdk.plugin_store(plugin_id="learning_wiki")
     p.mkdir(parents=True, exist_ok=True)
     return p
 
diff --git a/protoagent.plugin.yaml b/protoagent.plugin.yaml
index 6cd2761..617f622 100644
--- a/protoagent.plugin.yaml
+++ b/protoagent.plugin.yaml
@@ -3,7 +3,7 @@
 # (tests/test_packaging.py enforces it).
 id: learning_wiki
 name: Learning Wiki
-version: 0.3.3
+version: 0.3.4
 description: >-
   An adaptive learning wiki: the agent maintains a persistent, interlinked wiki
   of concept pages (Karpathy's LLM-wiki pattern) PLUS a learner ledger — per-concept
@@ -21,11 +21,11 @@ description: >-
 enabled: false
 repository: https://github.com/protoLabsAI/learningWiki-plugin
 guide_url: https://github.com/protoLabsAI/learningWiki-plugin#install--enable
-min_protoagent_version: "0.34.0"
+min_protoagent_version: "0.148.0"  # sdk.plugin_store
 
 config_section: learning_wiki
 config:
-  data_dir: ""              # override the store dir; default = instance_paths().store("learning_wiki")
+  data_dir: ""              # override the store dir; default = this instance's plugin store
   desired_retention: 0.9    # FSRS target retrievability at review time (0.7–0.97 sane)
   fsrs_weights: []          # 17 floats overriding the FSRS-4.5 defaults (empty = published defaults)
   nudge_interval_hours: 0   # >0 = background surface checks due cards every N hours
diff --git a/pyproject.toml b/pyproject.toml
index ac045c4..bf98a61 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "learning-wiki"
-version = "0.3.3"
+version = "0.3.4"
 description = "Adaptive learning-wiki plugin for protoAgent: LLM-maintained wiki + learner ledger + FSRS spaced review."
 requires-python = ">=3.11"
 
diff --git a/tests/test_store_path.py b/tests/test_store_path.py
new file mode 100644
index 0000000..15467dd
--- /dev/null
+++ b/tests/test_store_path.py
@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import sys
+import types
+
+import learning_wiki
+
+
+def test_default_store_comes_from_the_plugin_sdk(monkeypatch, tmp_path):
+    monkeypatch.delenv("LEARNING_WIKI_DIR", raising=False)
+    calls = []
+    sdk = types.ModuleType("graph.sdk")
+
+    def plugin_store(*, plugin_id):
+        calls.append(plugin_id)
+        tmp_path.mkdir(parents=True, exist_ok=True)
+        return tmp_path
+
+    sdk.plugin_store = plugin_store
+    graph = types.ModuleType("graph")
+    graph.sdk = sdk
+    monkeypatch.setitem(sys.modules, "graph", graph)
+    monkeypatch.setitem(sys.modules, "graph.sdk", sdk)
+
+    assert learning_wiki._data_dir({}) == tmp_path
+    assert calls == ["learning_wiki"]
+
+
+def test_config_and_env_overrides_stay_literal_and_skip_the_sdk(monkeypatch, tmp_path):
+    environment = tmp_path / "environment"
+    configured = tmp_path / "configured"
+    monkeypatch.setenv("LEARNING_WIKI_DIR", str(environment))
+
+    assert learning_wiki._data_dir({}) == environment
+    assert learning_wiki._data_dir({"data_dir": str(configured)}) == configured