diff --git a/openspec/changes/uv-workspace-packaging/tasks.md b/openspec/changes/uv-workspace-packaging/tasks.md
index ff2596e..aeff270 100644
--- a/openspec/changes/uv-workspace-packaging/tasks.md
+++ b/openspec/changes/uv-workspace-packaging/tasks.md
@@ -3,7 +3,7 @@
 - [x] 1.1 Record the current non-integration test result and verify the existing root distribution builds before moving packages.
   - Baseline: `uv run pytest -m "not integration"` -> 314 passed, 6 deselected.
   - Baseline: `uv build` -> root sdist and wheel built successfully.
-- [ ] 1.2 Add `[tool.uv.workspace]` membership to the root project while retaining `device-agent-runtime` as the root package.
+- [x] 1.2 Add `[tool.uv.workspace]` membership to the root project while retaining `device-agent-runtime` as the root package.
 - [ ] 1.3 Create `packages/cloud-platform/pyproject.toml` for the `device-cloud-platform` distribution with explicit build and package-discovery metadata.
 - [ ] 1.4 Declare `device-agent-runtime` as a workspace source dependency of `device-cloud-platform` without adding any reverse dependency.
 
diff --git a/pyproject.toml b/pyproject.toml
index 11e2b25..0935956 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,9 @@ dev = [
     "pytest>=8.3.0",
 ]
 
+[tool.uv.workspace]
+members = []
+
 [tool.setuptools.packages.find]
 include = [
     "agents*",