diff --git a/src/basic_memory/mcp/tools/project_management.py b/src/basic_memory/mcp/tools/project_management.py
index f9449b4f..c2b13dfe 100644
--- a/src/basic_memory/mcp/tools/project_management.py
+++ b/src/basic_memory/mcp/tools/project_management.py
@@ -11,10 +11,16 @@ from fastmcp import Context
 from loguru import logger
 
 from basic_memory.config import ConfigManager, has_cloud_credentials
-from basic_memory.mcp.async_client import get_client, is_factory_mode
+from basic_memory.mcp.async_client import (
+    _explicit_routing,
+    _force_local_mode,
+    get_client,
+    is_factory_mode,
+)
 from basic_memory.mcp.project_context import (
     WorkspaceProjectEntry,
     ensure_workspace_project_index,
+    resolve_workspace_parameter,
 )
 from basic_memory.mcp.server import mcp
 from basic_memory.schemas.project_info import ProjectInfoRequest, ProjectItem, ProjectList
@@ -363,6 +369,31 @@ def _format_constrained_text(constrained_project: str) -> str:
     return result
 
 
+async def _resolve_create_project_workspace(
+    workspace: str | None,
+    context: Context | None,
+) -> str | None:
+    """Resolve the create-project workspace selector to the routing tenant id."""
+    if workspace is None:
+        return None
+
+    explicit_cloud_routing = _explicit_routing() and not _force_local_mode()
+    config = ConfigManager().config
+    should_resolve_workspace = is_factory_mode() or (
+        explicit_cloud_routing and has_cloud_credentials(config)
+    )
+    if not should_resolve_workspace:
+        return workspace
+
+    # Trigger: cloud routing can use workspace discovery and the caller supplied
+    #   a friendly selector such as a slug, name, or tenant id.
+    # Why: MCP callers should not need to paste UUIDs, but the transport still
+    #   uses X-Workspace-ID with the tenant id as its routing authority.
+    # Outcome: resolve once at create time and pass only the tenant id downstream.
+    resolved_workspace = await resolve_workspace_parameter(workspace=workspace, context=context)
+    return resolved_workspace.tenant_id
+
+
 @mcp.tool(
     "create_memory_project",
     annotations={"destructiveHint": False, "openWorldHint": False},
@@ -371,6 +402,7 @@ async def create_memory_project(
     project_name: str,
     project_path: str,
     set_default: bool = False,
+    workspace: str | None = None,
     output_format: Literal["text", "json"] = "text",
     context: Context | None = None,
 ) -> str | dict:
@@ -383,6 +415,11 @@ async def create_memory_project(
         project_name: Name for the new project (must be unique)
         project_path: File system path where the project will be stored
         set_default: Whether to set this project as the default (optional, defaults to False)
+        workspace: Optional cloud workspace selector to create the project in. Slug is
+            preferred for AI callers, but tenant_id and unique name are also accepted.
+            When omitted, the connection's default workspace is used. Discover values
+            via `list_workspaces`. Only meaningful in cloud mode; ignored for local
+            projects.
         output_format: "text" returns the existing human-readable result text.
             "json" returns structured project creation metadata.
         context: Optional FastMCP context for progress/status logging.
@@ -393,8 +430,15 @@ async def create_memory_project(
     Example:
         create_memory_project("my-research", "~/Documents/research")
         create_memory_project("work-notes", "/home/user/work", set_default=True)
+        create_memory_project("team-notes", "/team/notes", workspace="team-paul")
     """
-    async with get_client() as client:
+    workspace_id = await _resolve_create_project_workspace(workspace, context)
+
+    # workspace targets a non-default cloud workspace at create time.
+    # Trigger: caller passed workspace (e.g. a slug discovered via list_workspaces).
+    # Why: there is no project_id yet for per-project routing — the project doesn't exist.
+    # Outcome: cloud factory routes the create request to the resolved workspace tenant id.
+    async with get_client(workspace=workspace_id) as client:
         # Check if server is constrained to a specific project
         constrained_project = os.environ.get("BASIC_MEMORY_MCP_PROJECT")
         if constrained_project:
diff --git a/test-int/mcp/test_project_management_integration.py b/test-int/mcp/test_project_management_integration.py
index 58606732..b663ab61 100644
--- a/test-int/mcp/test_project_management_integration.py
+++ b/test-int/mcp/test_project_management_integration.py
@@ -588,3 +588,122 @@ async def test_nested_project_paths_rejected(mcp_server, app, test_project, tmp_
 
         # Clean up parent project
         await client.call_tool("delete_project", {"project_name": parent_name})
+
+
+@pytest.mark.asyncio
+async def test_create_project_accepts_workspace_in_local_mode(
+    mcp_server, app, test_project, tmp_path
+):
+    """Passing workspace via the MCP wire is accepted by the tool schema and
+    does not break the local create path.
+
+    In local mode there is no cloud factory installed, so workspace is a no-op:
+    the request lands on the ASGI transport which has no workspace concept. This
+    test guards the schema so a future change can't accidentally drop the parameter.
+    """
+
+    async with Client(mcp_server) as client:
+        create_result = await client.call_tool(
+            "create_memory_project",
+            {
+                "project_name": "ws-local-test",
+                "project_path": str(
+                    tmp_path.parent / (tmp_path.name + "-projects") / "project-ws-local-test"
+                ),
+                "workspace": "team-paul",
+            },
+        )
+
+        assert len(create_result.content) == 1
+        create_text = create_result.content[0].text  # pyright: ignore [reportAttributeAccessIssue]
+        assert "✓" in create_text
+        assert "ws-local-test" in create_text
+
+        list_result = await client.call_tool("list_memory_projects", {})
+        assert "ws-local-test" in list_result.content[0].text  # pyright: ignore [reportAttributeAccessIssue]
+
+
+@pytest.mark.asyncio
+async def test_create_project_workspace_slug_forwarded_to_factory_as_tenant_id(
+    mcp_server, app, test_project, tmp_path
+):
+    """workspace slug resolves before the tenant id flows to the cloud factory.
+
+    Simulates the cloud MCP server pattern (set_client_factory) and verifies the
+    factory receives the workspace argument. This is the chicken-and-egg case:
+    no project_id exists yet, so workspace is the only way to target a
+    non-default workspace at create time.
+    """
+    from contextlib import asynccontextmanager
+    from unittest.mock import AsyncMock, patch
+
+    from httpx import ASGITransport, AsyncClient as HttpxAsyncClient
+
+    from basic_memory.mcp import async_client
+    from basic_memory.mcp.tools import project_management
+    from basic_memory.schemas.cloud import WorkspaceInfo
+
+    captured_workspaces: list[str | None] = []
+    resolved_workspace = WorkspaceInfo(
+        tenant_id="tenant-cloud-test",
+        name="Team Paul",
+        workspace_type="organization",
+        slug="team-paul",
+        role="owner",
+        organization_id="org-team-paul",
+        is_default=False,
+        has_active_subscription=True,
+    )
+
+    @asynccontextmanager
+    async def fake_factory(workspace=None):
+        captured_workspaces.append(workspace)
+        # Yield an ASGI-backed httpx client so the create_project HTTP call
+        # actually reaches the FastAPI app and the project is created in the DB.
+        async with HttpxAsyncClient(
+            transport=ASGITransport(app=app), base_url="http://test"
+        ) as inner:
+            yield inner
+
+    original_factory = async_client._client_factory
+    async_client.set_client_factory(fake_factory)
+    try:
+        with patch.object(
+            project_management,
+            "resolve_workspace_parameter",
+            new_callable=AsyncMock,
+            return_value=resolved_workspace,
+        ) as mock_resolve_workspace:
+            async with Client(mcp_server) as mcp_client:
+                create_result = await mcp_client.call_tool(
+                    "create_memory_project",
+                    {
+                        "project_name": "ws-routed-project",
+                        "project_path": str(
+                            tmp_path.parent
+                            / (tmp_path.name + "-projects")
+                            / "project-ws-routed-project"
+                        ),
+                        "workspace": "team-paul",
+                    },
+                )
+
+        create_text = create_result.content[0].text  # pyright: ignore [reportAttributeAccessIssue]
+        assert "✓" in create_text
+        assert "ws-routed-project" in create_text
+
+        mock_resolve_workspace.assert_awaited_once()
+        await_args = mock_resolve_workspace.await_args
+        assert await_args is not None
+        assert await_args.kwargs["workspace"] == "team-paul"
+        # The factory must have been invoked with the tenant id resolved from the slug.
+        # create_memory_project opens one get_client() context, so the factory is
+        # called once per tool invocation; both list_projects and create_project
+        # share that single client.
+        assert captured_workspaces, "Factory was never invoked"
+        assert all(ws == "tenant-cloud-test" for ws in captured_workspaces), (
+            "Expected workspace='tenant-cloud-test' on every factory call, "
+            f"got {captured_workspaces}"
+        )
+    finally:
+        async_client._client_factory = original_factory
diff --git a/tests/mcp/test_tool_contracts.py b/tests/mcp/test_tool_contracts.py
index 6327a2ab..afd101cc 100644
--- a/tests/mcp/test_tool_contracts.py
+++ b/tests/mcp/test_tool_contracts.py
@@ -23,7 +23,13 @@ EXPECTED_TOOL_SIGNATURES: dict[str, list[str]] = {
     ],
     "canvas": ["nodes", "edges", "title", "directory", "project", "project_id"],
     "cloud_info": [],
-    "create_memory_project": ["project_name", "project_path", "set_default", "output_format"],
+    "create_memory_project": [
+        "project_name",
+        "project_path",
+        "set_default",
+        "workspace",
+        "output_format",
+    ],
     "delete_note": ["identifier", "is_directory", "project", "project_id", "output_format"],
     "delete_project": ["project_name"],
     "edit_note": [
diff --git a/tests/mcp/test_tool_project_management.py b/tests/mcp/test_tool_project_management.py
index 812539de..1ce67a49 100644
--- a/tests/mcp/test_tool_project_management.py
+++ b/tests/mcp/test_tool_project_management.py
@@ -133,6 +133,201 @@ async def test_create_and_delete_project_and_name_match_branch(
     assert delete_result.startswith("✓")
 
 
+@pytest.mark.asyncio
+async def test_create_memory_project_resolves_workspace_slug(app, tmp_path_factory):
+    """A friendly workspace slug resolves to the tenant id used for cloud routing."""
+    from contextlib import asynccontextmanager
+    import httpx
+
+    from basic_memory.mcp.clients import ProjectClient
+    from basic_memory.schemas.project_info import ProjectStatusResponse
+
+    project_root = tmp_path_factory.mktemp("ws-project-home")
+    captured: dict[str, str | None] = {}
+
+    @asynccontextmanager
+    async def fake_get_client(*, workspace=None, project_name=None):
+        captured["workspace"] = workspace
+        async with httpx.AsyncClient(base_url="http://testserver") as client:
+            yield client
+
+    fake_status = ProjectStatusResponse(
+        message="Project created",
+        status="success",
+        default=False,
+        new_project=_make_project("WS Project", str(project_root)),
+    )
+
+    with (
+        patch(
+            "basic_memory.mcp.tools.project_management.get_client",
+            new=fake_get_client,
+        ),
+        patch(
+            "basic_memory.mcp.tools.project_management.is_factory_mode",
+            return_value=True,
+        ),
+        patch(
+            "basic_memory.mcp.tools.project_management.resolve_workspace_parameter",
+            new_callable=AsyncMock,
+            return_value=_make_workspace(
+                "tenant-abc-123",
+                "Team Paul",
+                workspace_type="organization",
+                slug="team-paul",
+            ),
+        ) as mock_resolve_workspace,
+        patch.object(
+            ProjectClient,
+            "list_projects",
+            new_callable=AsyncMock,
+            return_value=_make_list([], default=None),
+        ),
+        patch.object(
+            ProjectClient,
+            "create_project",
+            new_callable=AsyncMock,
+            return_value=fake_status,
+        ),
+        patch(
+            "basic_memory.mcp.project_context.invalidate_workspace_project_index",
+            new_callable=AsyncMock,
+        ),
+    ):
+        await create_memory_project(
+            project_name="WS Project",
+            project_path=str(project_root),
+            workspace="team-paul",
+        )
+
+    mock_resolve_workspace.assert_awaited_once_with(workspace="team-paul", context=None)
+    assert captured["workspace"] == "tenant-abc-123"
+
+
+@pytest.mark.asyncio
+async def test_create_memory_project_workspace_is_local_noop(app, tmp_path_factory):
+    """Local create accepts workspace without requiring cloud workspace discovery."""
+    from contextlib import asynccontextmanager
+    import httpx
+
+    from basic_memory.mcp.clients import ProjectClient
+    from basic_memory.schemas.project_info import ProjectStatusResponse
+
+    project_root = tmp_path_factory.mktemp("local-ws-project-home")
+    captured: dict[str, str | None] = {}
+
+    @asynccontextmanager
+    async def fake_get_client(*, workspace=None, project_name=None):
+        captured["workspace"] = workspace
+        async with httpx.AsyncClient(base_url="http://testserver") as client:
+            yield client
+
+    fake_status = ProjectStatusResponse(
+        message="Project created",
+        status="success",
+        default=False,
+        new_project=_make_project("Local WS Project", str(project_root)),
+    )
+
+    with (
+        patch(
+            "basic_memory.mcp.tools.project_management.get_client",
+            new=fake_get_client,
+        ),
+        patch(
+            "basic_memory.mcp.tools.project_management.is_factory_mode",
+            return_value=False,
+        ),
+        patch(
+            "basic_memory.mcp.tools.project_management.has_cloud_credentials",
+            return_value=False,
+        ),
+        patch(
+            "basic_memory.mcp.tools.project_management.resolve_workspace_parameter",
+            new_callable=AsyncMock,
+        ) as mock_resolve_workspace,
+        patch.object(
+            ProjectClient,
+            "list_projects",
+            new_callable=AsyncMock,
+            return_value=_make_list([], default=None),
+        ),
+        patch.object(
+            ProjectClient,
+            "create_project",
+            new_callable=AsyncMock,
+            return_value=fake_status,
+        ),
+        patch(
+            "basic_memory.mcp.project_context.invalidate_workspace_project_index",
+            new_callable=AsyncMock,
+        ),
+    ):
+        await create_memory_project(
+            project_name="Local WS Project",
+            project_path=str(project_root),
+            workspace="team-paul",
+        )
+
+    mock_resolve_workspace.assert_not_awaited()
+    assert captured["workspace"] == "team-paul"
+
+
+@pytest.mark.asyncio
+async def test_create_memory_project_default_workspace_is_none(app, tmp_path_factory):
+    """When workspace is omitted, get_client receives workspace=None (default workspace)."""
+    from contextlib import asynccontextmanager
+    import httpx
+
+    from basic_memory.mcp.clients import ProjectClient
+    from basic_memory.schemas.project_info import ProjectStatusResponse
+
+    project_root = tmp_path_factory.mktemp("default-ws-project-home")
+    captured: dict[str, str | None] = {"workspace": "sentinel"}
+
+    @asynccontextmanager
+    async def fake_get_client(*, workspace=None, project_name=None):
+        captured["workspace"] = workspace
+        async with httpx.AsyncClient(base_url="http://testserver") as client:
+            yield client
+
+    fake_status = ProjectStatusResponse(
+        message="Project created",
+        status="success",
+        default=False,
+        new_project=_make_project("Default WS Project", str(project_root)),
+    )
+
+    with (
+        patch(
+            "basic_memory.mcp.tools.project_management.get_client",
+            new=fake_get_client,
+        ),
+        patch.object(
+            ProjectClient,
+            "list_projects",
+            new_callable=AsyncMock,
+            return_value=_make_list([], default=None),
+        ),
+        patch.object(
+            ProjectClient,
+            "create_project",
+            new_callable=AsyncMock,
+            return_value=fake_status,
+        ),
+        patch(
+            "basic_memory.mcp.project_context.invalidate_workspace_project_index",
+            new_callable=AsyncMock,
+        ),
+    ):
+        await create_memory_project(
+            project_name="Default WS Project",
+            project_path=str(project_root),
+        )
+
+    assert captured["workspace"] is None
+
+
 # --- Cloud merge tests ---