diff --git a/src/app.py b/src/app.py
index c584b2d..55a8923 100644
--- a/src/app.py
+++ b/src/app.py
@@ -137,6 +137,29 @@ if _mcp_enabled:
 
     init_mcp_auth(app.server)
 
+    # Serveur d'autorisation OAuth 2.1 (scope B2, #114) : découverte, DCR,
+    # authorize/token, révocation. Réutilise la session flask_login.
+    from src.mcp import usage  # noqa: E402
+    from src.mcp.oauth import routes as oauth_routes  # noqa: E402
+    from src.mcp.oauth import store as oauth_store  # noqa: E402
+
+    _users_db = os.environ["USERS_DB_PATH"]
+    oauth_store.init_schema(_users_db)
+    usage.init_schema(_users_db)
+    usage.purge_older_than(_users_db)
+
+    oauth_routes.init_oauth(app.server)
+
+    # Exempter les routes OAuth du CSRF (POST externes JSON-RPC/form sans jeton).
+    if _auth_csrf is not None:
+        for _rule in app.server.url_map.iter_rules():
+            if _rule.rule.startswith("/oauth") or _rule.rule.startswith(
+                "/.well-known/oauth"
+            ):
+                _vf = app.server.view_functions.get(_rule.endpoint)
+                if _vf is not None:
+                    _auth_csrf.exempt(_vf)
+
 from src.subscriptions.setup import init_subscriptions  # noqa: E402
 
 init_subscriptions(app.server)
diff --git a/src/migrations.py b/src/migrations.py
index 71c08e8..fcbc40d 100644
--- a/src/migrations.py
+++ b/src/migrations.py
@@ -46,6 +46,34 @@ _MIGRATIONS: list[tuple[str, str]] = [
         "0007_add_kind_to_api_tokens",
         "ALTER TABLE api_tokens ADD COLUMN kind TEXT NOT NULL DEFAULT 'api'",
     ),
+    (
+        "0008_create_oauth_clients",
+        "CREATE TABLE IF NOT EXISTS oauth_clients ("
+        "client_id TEXT PRIMARY KEY, client_metadata TEXT NOT NULL, "
+        "created_at TEXT NOT NULL)",
+    ),
+    (
+        "0009_create_oauth_codes",
+        "CREATE TABLE IF NOT EXISTS oauth_codes ("
+        "code_hash TEXT PRIMARY KEY, client_id TEXT NOT NULL, user_id INTEGER NOT NULL, "
+        "redirect_uri TEXT, code_challenge TEXT, code_challenge_method TEXT, "
+        "scope TEXT, resource TEXT, expires_at TEXT NOT NULL, used INTEGER NOT NULL DEFAULT 0)",
+    ),
+    (
+        "0010_create_oauth_tokens",
+        "CREATE TABLE IF NOT EXISTS oauth_tokens ("
+        "id INTEGER PRIMARY KEY, access_token_hash TEXT NOT NULL UNIQUE, "
+        "refresh_token_hash TEXT UNIQUE, client_id TEXT NOT NULL, user_id INTEGER NOT NULL, "
+        "scope TEXT, resource TEXT NOT NULL, issued_at TEXT NOT NULL, "
+        "access_expires_at TEXT NOT NULL, refresh_expires_at TEXT, revoked_at TEXT, "
+        "count_total INTEGER NOT NULL DEFAULT 0, last_used_at TEXT)",
+    ),
+    (
+        "0011_create_mcp_usage",
+        "CREATE TABLE IF NOT EXISTS mcp_usage ("
+        "id INTEGER PRIMARY KEY, user_id INTEGER, token_id INTEGER, "
+        "kind TEXT NOT NULL, created_at TEXT NOT NULL)",
+    ),
 ]
 
 
diff --git a/tests/mcp/test_app_wiring.py b/tests/mcp/test_app_wiring.py
index d1dd039..0f2a354 100644
--- a/tests/mcp/test_app_wiring.py
+++ b/tests/mcp/test_app_wiring.py
@@ -49,3 +49,41 @@ def test_mcp_endpoint_guarded_and_csrf_exempt(monkeypatch, tmp_path):
             else:
                 del sys.modules[name]
         auth_db.reset_conn_for_tests()
+
+
+def test_oauth_wellknown_served_when_mcp_enabled(monkeypatch, tmp_path):
+    # DB éphémère + secrets requis par init_auth/init_subscriptions.
+    monkeypatch.setenv("USERS_DB_PATH", str(tmp_path / "users.test.sqlite"))
+    monkeypatch.setenv("SECRET_KEY", "test-secret-key")
+    monkeypatch.setenv("APP_BASE_URL", "https://colibre.fr")
+    monkeypatch.setenv("DASH_MCP_ENABLED", "true")
+
+    from src.auth import db as auth_db
+
+    auth_db.reset_conn_for_tests()
+
+    # Voir commentaire ci-dessus : reload de src.app pollue sys.modules pour
+    # src.pages.* ; on snapshot/restaure de la même façon.
+    snapshot = {
+        name: mod
+        for name, mod in sys.modules.items()
+        if name == "src.app" or name.startswith("src.pages")
+    }
+    try:
+        import src.app as app_module
+
+        app_module = importlib.reload(app_module)
+        client = app_module.app.server.test_client()
+
+        resp = client.get("/.well-known/oauth-protected-resource")
+        assert resp.status_code == 200
+        assert resp.get_json()["resource"] == "https://colibre.fr/_mcp"
+    finally:
+        for name in [
+            n for n in sys.modules if n == "src.app" or n.startswith("src.pages")
+        ]:
+            if name in snapshot:
+                sys.modules[name] = snapshot[name]
+            else:
+                del sys.modules[name]
+        auth_db.reset_conn_for_tests()