diff --git a/src/perspicacite/mcp/usage_guide.py b/src/perspicacite/mcp/usage_guide.py
index 71293e3..ce52f2d 100644
--- a/src/perspicacite/mcp/usage_guide.py
+++ b/src/perspicacite/mcp/usage_guide.py
@@ -171,6 +171,30 @@
         "when_to_use": "Ingest specific DOIs into a KB.",
         "key_knobs": [],
     },
+    {
+        "name": "ensure_kb",
+        "purpose": (
+            "Idempotently create and ingest a per-paper KB for a DOI, using the ASB "
+            "binder slug convention. Returns immediately if the KB already has chunks."
+        ),
+        "when_to_use": (
+            "Before grounding questions against a single paper, to guarantee its KB "
+            "exists without re-ingesting it on every call."
+        ),
+        "key_knobs": ["doi (required)", "mode — reserved, currently unused"],
+    },
+    {
+        "name": "ground_paper",
+        "purpose": (
+            "Answer a research question against one paper's dedicated KB, ensuring "
+            "that KB exists first (via ensure_kb)."
+        ),
+        "when_to_use": (
+            "Ask a question of a specific paper by DOI in one call. Set tier='si' to "
+            "prefer evidence from the paper's supplementary information."
+        ),
+        "key_knobs": ["doi (required)", "question (required)", "tier (paper|si) — default: paper"],
+    },
     {
         "name": "ingest_local_documents",
         "purpose": "Ingest local files (PDF/text) into a KB.",
diff --git a/tests/unit/test_web_app_routes.py b/tests/unit/test_web_app_routes.py
index 0957cd5..a454dfa 100644
--- a/tests/unit/test_web_app_routes.py
+++ b/tests/unit/test_web_app_routes.py
@@ -54,12 +54,27 @@ def _load_app():
     return app
 
 
+def _flatten_routes(routes):
+    """Yield leaf routes, descending into routers wrapped by include_router.
+
+    FastAPI >= 0.139 no longer copies an included router's routes onto the app.
+    It appends one wrapper per include_router() call, exposing the router as
+    ``original_router``. Older versions flatten, leaving nothing to descend into.
+    """
+    for route in routes:
+        included_router = getattr(route, "original_router", None)
+        if included_router is None:
+            yield route
+        else:
+            yield from _flatten_routes(included_router.routes)
+
+
 def _route_methods_by_path(app):
-    """Return {path: {methods}} for every APIRoute on the app."""
+    """Return {path: {methods}} for every APIRoute reachable from the app."""
     from fastapi.routing import APIRoute
 
     out: dict[str, set[str]] = {}
-    for r in app.routes:
+    for r in _flatten_routes(app.routes):
         if isinstance(r, APIRoute):
             out.setdefault(r.path, set()).update(r.methods or set())
         else: