diff --git a/README.md b/README.md
index a8f9ff5e..8ad8f0b3 100644
--- a/README.md
+++ b/README.md
@@ -242,7 +242,7 @@ project literally called `Inbox` would need `things -p Inbox`.
 | `inbox` | Inbox |
 | `upcoming` | Scheduled tasks and deadlines |
 | `anytime` | Anytime list |
-| `someday` | Someday list |
+| `someday` | Someday projects and unparented Someday to-dos |
 | `repeating` | Repeating to-do and project templates |
 | `logbook` | Completed and cancelled tasks |
 | `trash` | Trashed tasks |
@@ -264,7 +264,7 @@ Filters:
 
 | Flag | Description |
 | --- | --- |
-| `-p, --project NAME` | Filter by project name or UUID |
+| `-p, --project NAME` | Filter by project name or UUID (not on `someday`, which lists only unparented items) |
 | `-a, --area NAME` | Filter by area name or UUID |
 | `-t, --tag NAME` | Filter by tag name |
 | `--on DATE` | Only tasks scheduled on `YYYY-MM-DD` (or RFC3339); on `deadlines`, filters by deadline |
diff --git a/cmd/things/main.go b/cmd/things/main.go
index b1bf3fbf..ff729f60 100644
--- a/cmd/things/main.go
+++ b/cmd/things/main.go
@@ -217,6 +217,13 @@ func (c *ListCmd) Run(d *Deps) error {
 		return fmt.Errorf("--include-completed is only supported on the %q view, not %q; name the view explicitly, e.g. `things today --project NAME`", "today", view)
 	}
 
+	// someday lists only what has no parent project, so narrowing it to one
+	// could never match a row (issue #211). Say so rather than print an empty
+	// list, the same way an impossible date filter is rejected.
+	if project != "" && !db.ProjectFilterableView(view) {
+		return fmt.Errorf("--project is not supported on the %q view: it lists only items with no parent project; use `things --project %q` for a project's own to-dos", view, project)
+	}
+
 	filter := db.TaskFilter{
 		Project:          project,
 		Area:             c.Area,
diff --git a/cmd/things/run_test.go b/cmd/things/run_test.go
index 935febfd..7811f4f7 100644
--- a/cmd/things/run_test.go
+++ b/cmd/things/run_test.go
@@ -279,6 +279,32 @@ func TestRunListDateFilterRejectsView(t *testing.T) {
 	}
 }
 
+// someday carries no row with a parent project (issue #211), so --project on
+// it — flag or positional — could never match. It is rejected rather than
+// silently printing an empty list, as an impossible date filter is.
+func TestRunListSomedayRejectsProjectFilter(t *testing.T) {
+	database := seedFullDB(t)
+
+	err := runWith(t, database, "list", "someday", "--project", "Launch v2")
+	if err == nil || !strings.Contains(err.Error(), "not supported on the \"someday\" view") {
+		t.Fatalf("--project: expected view-rejection error, got: %v", err)
+	}
+
+	// The positional form resolves to the same filter, so it is rejected too.
+	err = runWith(t, database, "list", "someday", "Launch v2")
+	if err == nil || !strings.Contains(err.Error(), "not supported on the \"someday\" view") {
+		t.Fatalf("positional project: expected view-rejection error, got: %v", err)
+	}
+
+	// The view itself still lists, and --area still narrows it.
+	if err := runWith(t, database, "list", "someday"); err != nil {
+		t.Fatalf("bare someday: %v", err)
+	}
+	if err := runWith(t, database, "list", "someday", "--area", "Home"); err != nil {
+		t.Fatalf("someday --area: %v", err)
+	}
+}
+
 func TestRunListIncludeCompletedRejectsView(t *testing.T) {
 	database := seedFullDB(t)
 
diff --git a/docs/content/agents.md b/docs/content/agents.md
index 8f4dfd7d..6684fc99 100644
--- a/docs/content/agents.md
+++ b/docs/content/agents.md
@@ -226,6 +226,16 @@ a script that acts on a listing should say which kind it means. It matters:
 every to-do inside it, so it asks first and refuses outright under `--json`
 without `--yes`.
 
+`someday` matches the app's Someday list, which holds the deferred things not
+filed under a project. A to-do inside a project stays inside it however it is
+deferred, so an agent asked what is in Someday sees Someday projects and
+unparented Someday to-dos, not the deferred contents of other projects. That
+holds even when the parent project is itself in Someday: the project lists, its
+to-dos do not. To sweep a project's own deferred to-dos, name the project:
+`things --project "Name" -j`. `things someday --project "Name"` is an error,
+not an empty list — nothing in the view has a parent project, so the filter
+could never match.
+
 `logbook` is everything closed, not just everything finished: a cancelled
 to-do or project is logged beside the completed ones, as the app's Logbook
 shows them. `status` separates them, `"completed"` or `"cancelled"`, so an
diff --git a/docs/content/commands.md b/docs/content/commands.md
index 046b959d..5fc30215 100644
--- a/docs/content/commands.md
+++ b/docs/content/commands.md
@@ -55,6 +55,14 @@ way the app's Logbook shows both, so the view returns cancelled rows too.
 `[~]` in plain output — so filter on it when you mean finished rather than
 closed: `things logbook -j | jq '.[] | select(.status=="completed")'`.
 
+`someday` is the app's Someday list: the deferred things you have not filed
+under a project. A to-do inside a project stays inside it however it is
+deferred, so `someday` returns Someday projects and unparented Someday to-dos,
+not the deferred to-dos of an Anytime project. Open the project to see those —
+`things --project "Name"` — or use `anytime`, which carries the project itself.
+Because nothing in `someday` has a parent project, `--project` there could
+never match; the CLI rejects the combination rather than print an empty list.
+
 `repeating` lists repeating to-do and project templates. The items a template
 generates are ordinary to-dos and projects and appear in `today`, `upcoming`,
 `things projects` and the rest; the template itself appears only here — plus
diff --git a/internal/db/repeating_test.go b/internal/db/repeating_test.go
index d73c84af..ebd8ae40 100644
--- a/internal/db/repeating_test.go
+++ b/internal/db/repeating_test.go
@@ -250,6 +250,39 @@ func TestRepeatingViewExcludesHeadings(t *testing.T) {
 	}
 }
 
+// Someday keeps no to-do that sits inside a project, whether that project is a
+// repeating template or an ordinary one (issues #171, #211), so the template
+// guard cannot be told apart from the parent guard by presence alone. What
+// still has to hold is that the view is not simply empty: a top-level Someday
+// to-do, and a Someday project row, both list.
+func TestTemplateChildExcludedFromSomeday(t *testing.T) {
+	d := newTestDB(t)
+
+	mustExec(t, d, `INSERT INTO TMTask
+		(uuid, title, type, status, trashed, start, startBucket, "index", rt1_recurrenceRule) VALUES
+		('p-tmpl', 'Weekly review', 1, 0, 0, 2, 0, 1, x'0102')`)
+	mustExec(t, d, `INSERT INTO TMTask
+		(uuid, title, type, status, trashed, start, startBucket, "index") VALUES
+		('p-real', 'Ship it', 1, 0, 0, 2, 0, 2)`)
+	mustExec(t, d, `INSERT INTO TMTask
+		(uuid, title, type, status, trashed, start, startBucket, project, "index") VALUES
+		('t-in-tmpl', 'Inside the template', 0, 0, 0, 2, 0, 'p-tmpl', 1),
+		('t-in-real', 'Inside a real one',   0, 0, 0, 2, 0, 'p-real', 2)`)
+	mustExec(t, d, `INSERT INTO TMTask
+		(uuid, title, type, status, trashed, start, startBucket, "index") VALUES
+		('t-toplevel', 'Deferred on its own', 0, 0, 0, 2, 0, 3)`)
+
+	got, err := d.ListTasks("someday", TaskFilter{})
+	if err != nil {
+		t.Fatalf("ListTasks(someday): %v", err)
+	}
+	// p-real is a Someday project and lists as a row of its own; p-tmpl is a
+	// template and belongs to the repeating view.
+	if !sameSet(uuidsOf(got), []string{"t-toplevel", "p-real"}) {
+		t.Errorf("someday: got %v, want [t-toplevel p-real]", uuidsOf(got))
+	}
+}
+
 // A to-do inside a repeating project template must not list as an ordinary
 // task: `things projects` does not report its project, so it would show
 // against a project the user cannot see (issue #171). Each case seeds the row
@@ -269,7 +302,10 @@ func TestTemplateProjectChildrenExcludedFromOpenViews(t *testing.T) {
 		{"today", "start, startBucket, startDate", fmt.Sprintf("1, 0, %d", today)},
 		{"upcoming", "start, startBucket, startDate", fmt.Sprintf("2, 0, %d", tomorrow)},
 		{"anytime", "start, startBucket", "1, 0"},
-		{"someday", "start, startBucket", "2, 0"},
+		// someday is absent deliberately: since issue #211 it carries no
+		// to-do with a parent project at all, so the sibling this table
+		// relies on cannot exist there. TestTemplateChildExcludedFromSomeday
+		// covers that view instead.
 		{"deadlines", "start, startBucket, deadline", fmt.Sprintf("1, 0, %d", tomorrow)},
 		{"project", "start, startBucket", "1, 0"},
 	}
diff --git a/internal/db/tasks.go b/internal/db/tasks.go
index bf91f23a..a1033c4e 100644
--- a/internal/db/tasks.go
+++ b/internal/db/tasks.go
@@ -40,6 +40,21 @@ func DateFilterableView(view string) bool {
 	return dateFilterableViews[view]
 }
 
+// viewsWithoutProjectFilter lists the views a --project filter can never match
+// in. someday keeps only rows with no parent project (issue #211), so pairing
+// it with --project asks for the contents of a project the view has already
+// excluded: the two clauses contradict, and the listing is empty whatever the
+// project holds. Rejecting the combination beats printing an empty list, the
+// same call issue #124 made for date filters on this view.
+var viewsWithoutProjectFilter = map[string]bool{
+	"someday": true,
+}
+
+// ProjectFilterableView reports whether --project applies to the view.
+func ProjectFilterableView(view string) bool {
+	return !viewsWithoutProjectFilter[view]
+}
+
 // repeatingPlaceholder is substituted with the probed recurrence column
 // reference by (*DB).taskQuery — the column name varies across Things schema
 // versions, and a schema carrying none resolves it to NULL.
@@ -164,7 +179,18 @@ var viewFilters = map[string]string{
 	"inbox":    "t.start = 0 AND t.status = 0 AND t.trashed = 0 AND t.type = 0",
 	"upcoming": "t.start = 2 AND t.startDate IS NOT NULL AND t.status = 0 AND t.trashed = 0 AND " + todoOrProject,
 	"anytime":  "t.start = 1 AND t.status = 0 AND t.trashed = 0 AND " + todoOrProject,
-	"someday":  "t.start = 2 AND t.startDate IS NULL AND t.status = 0 AND t.trashed = 0 AND " + todoOrProject,
+	// Someday is the app's list of deferred things you have not filed under a
+	// project. A to-do inside a project stays inside it however it is deferred:
+	// the app shows it greyed within the project and keeps it out of the global
+	// Someday list, so "p.uuid IS NULL" is the parity rule (issue #211).
+	// Measured against the app rather than assumed — the discriminating case is
+	// a Someday to-do whose parent project is itself in Someday, and the app
+	// hides that one too, so the test is the presence of a parent, not the
+	// parent's own bucket. Project rows have no parent project, so they pass and
+	// stay listed (issue #206). Resolving p through COALESCE(t.project,
+	// h.project) means a to-do under a project heading is filed by its heading's
+	// project, not left looking unparented.
+	"someday": "t.start = 2 AND t.startDate IS NULL AND t.status = 0 AND t.trashed = 0 AND p.uuid IS NULL AND " + todoOrProject,
 	// The Logbook is where Things files everything closed, not just everything
 	// finished: cancelling a to-do or a project logs it under its stopDate
 	// beside the completed ones, so the view carries status 2 as well as 3
diff --git a/internal/db/tasks_test.go b/internal/db/tasks_test.go
index 030d3833..dd81f87c 100644
--- a/internal/db/tasks_test.go
+++ b/internal/db/tasks_test.go
@@ -2178,3 +2178,161 @@ func TestEveryTaskOrderingEndsInTheUUIDTiebreak(t *testing.T) {
 		}
 	}
 }
+
+func seedSomedayParents(t *testing.T, d *DB) {
+	t.Helper()
+
+	mustExec(t, d, `INSERT INTO TMArea (uuid, title, visible, "index") VALUES
+		('area-den', 'Den', 1, 1)`)
+
+	// Two parent projects in different buckets. The Someday one is the case
+	// that separates "no parent project" from "no parent project outside
+	// Someday": measured against Things, the app hides that child too.
+	mustExec(t, d, `INSERT INTO TMTask
+		(uuid, title, type, status, trashed, start, startBucket, startDate, area, "index") VALUES
+		('sd-parent-anytime', 'Anytime project', 1, 0, 0, 1, 0, NULL, 'area-den', 1),
+		('sd-parent-someday', 'Someday project', 1, 0, 0, 2, 0, NULL, 'area-den', 2)`)
+
+	// Someday to-dos: one under each parent, one under a heading of the
+	// Anytime parent, and two with no parent project at all.
+	mustExec(t, d, `INSERT INTO TMTask
+		(uuid, title, type, status, trashed, start, startBucket, startDate, project, "index") VALUES
+		('sd-in-anytime', 'Filed under anytime', 0, 0, 0, 2, 0, NULL, 'sd-parent-anytime', 3),
+		('sd-in-someday', 'Filed under someday', 0, 0, 0, 2, 0, NULL, 'sd-parent-someday', 4)`)
+	mustExec(t, d, `INSERT INTO TMTask
+		(uuid, title, type, status, trashed, project, "index") VALUES
+		('sd-head', 'Phase one', 2, 0, 0, 'sd-parent-anytime', 5)`)
+	mustExec(t, d, `INSERT INTO TMTask
+		(uuid, title, type, status, trashed, start, startBucket, startDate, heading, "index") VALUES
+		('sd-under-head', 'Filed under a heading', 0, 0, 0, 2, 0, NULL, 'sd-head', 6)`)
+	mustExec(t, d, `INSERT INTO TMTask
+		(uuid, title, type, status, trashed, start, startBucket, startDate, area, "index") VALUES
+		('sd-loose-area', 'Deferred in an area', 0, 0, 0, 2, 0, NULL, 'area-den', 7),
+		('sd-loose',      'Deferred on its own', 0, 0, 0, 2, 0, NULL, NULL,       8)`)
+}
+
+// Things' Someday list is the deferred things not filed under a project. A
+// to-do inside a project stays inside it however it is deferred, so the app
+// keeps it out of the global list while the CLI returned it (issue #211).
+//
+// The rule is the presence of a parent project, not the parent's bucket. That
+// was measured, not assumed: a probe project created in Someday through the
+// app, holding one Someday to-do, put the project in the app's Someday list
+// and left the child out.
+func TestListTasksSomedayExcludesProjectChildren(t *testing.T) {
+	d := newTestDB(t)
+	seedSomedayParents(t, d)
+
+	got, err := d.ListTasks("someday", TaskFilter{})
+	if err != nil {
+		t.Fatalf("ListTasks(someday): %v", err)
+	}
+	want := []string{"sd-parent-someday", "sd-loose-area", "sd-loose"}
+	if !sameSet(uuidsOf(got), want) {
+		t.Errorf("someday: got %v, want %v", uuidsOf(got), want)
+	}
+}
+
+// The discriminating case, called out on its own because it is the one the
+// issue guessed wrong: a Someday to-do whose parent project is itself in
+// Someday is still hidden, while the parent project lists.
+func TestListTasksSomedayHidesChildOfSomedayProject(t *testing.T) {
+	d := newTestDB(t)
+	seedSomedayParents(t, d)
+
+	got, err := d.ListTasks("someday", TaskFilter{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	uuids := uuidsOf(got)
+
+	var sawParent, sawChild bool
+	for _, u := range uuids {
+		switch u {
+		case "sd-parent-someday":
+			sawParent = true
+		case "sd-in-someday":
+			sawChild = true
+		}
+	}
+	if !sawParent {
+		t.Errorf("someday: parent project sd-parent-someday should list, got %v", uuids)
+	}
+	if sawChild {
+		t.Errorf("someday: sd-in-someday sits inside a Someday project and should not list, got %v", uuids)
+	}
+}
+
+// A to-do filed under a project heading carries a NULL project and reaches its
+// project through the heading, so it must be excluded by the same rule rather
+// than slipping through as unparented.
+func TestListTasksSomedayExcludesHeadingNestedChildren(t *testing.T) {
+	d := newTestDB(t)
+	seedSomedayParents(t, d)
+
+	got, err := d.ListTasks("someday", TaskFilter{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, task := range got {
+		if task.UUID == "sd-under-head" {
+			t.Errorf("someday: sd-under-head reaches a project through its heading and should not list")
+		}
+	}
+}
+
+// Narrowing someday must not empty it: a project row and an unparented to-do
+// both still list, and --area still finds them through the area they carry.
+func TestListTasksSomedayKeepsUnparentedRows(t *testing.T) {
+	d := newTestDB(t)
+	seedSomedayParents(t, d)
+
+	byArea, err := d.ListTasks("someday", TaskFilter{Area: "area-den"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !sameSet(uuidsOf(byArea), []string{"sd-parent-someday", "sd-loose-area"}) {
+		t.Errorf("--area area-den: got %v, want [sd-parent-someday sd-loose-area]", uuidsOf(byArea))
+	}
+
+	// --project can never match on this view now: every row that survives has
+	// no parent project. The CLI rejects the combination outright rather than
+	// print an empty list (see TestRunListSomedayRejectsProjectFilter); the
+	// query layer stays literal and simply matches nothing.
+	byProject, err := d.ListTasks("someday", TaskFilter{Project: "sd-parent-anytime"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(byProject) != 0 {
+		t.Errorf("--project sd-parent-anytime: got %v, want none", uuidsOf(byProject))
+	}
+}
+
+// The narrowing is someday-only: the same parented to-do still lists in the
+// other views, which show a project's contents.
+func TestListTasksProjectChildrenStayInOtherViews(t *testing.T) {
+	d := newTestDB(t)
+	seedSomedayParents(t, d)
+
+	// The seeded children are all someday-shaped (start=2, no startDate), so
+	// none of them can appear in another view as they stand. Seed one more
+	// child of the same parent in anytime shape to prove the guard is
+	// someday-only rather than global.
+	mustExec(t, d, `INSERT INTO TMTask
+		(uuid, title, type, status, trashed, start, startBucket, project, "index") VALUES
+		('sd-anytime-child', 'Inside, anytime', 0, 0, 0, 1, 0, 'sd-parent-anytime', 9)`)
+
+	got, err := d.ListTasks("anytime", TaskFilter{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	var found bool
+	for _, task := range got {
+		if task.UUID == "sd-anytime-child" {
+			found = true
+		}
+	}
+	if !found {
+		t.Errorf("anytime: sd-anytime-child should still list, got %v", uuidsOf(got))
+	}
+}
diff --git a/internal/skill/SKILL.md b/internal/skill/SKILL.md
index b799a4e0..8dbe2520 100644
--- a/internal/skill/SKILL.md
+++ b/internal/skill/SKILL.md
@@ -37,6 +37,7 @@ Most commands accept `--json` / `-j`. Prefer it when parsing. It also guarantees
 - `"repeating": true` marks an item Things treats as repeating; the field is omitted otherwise. A project appearing as a row in a task listing carries `"type": "project"`.
 - `things projects` reports `start`, `startBucket`, `startDate` and `deadline` under the same names and encodings a to-do uses, so a scheduled project reads the same way without a per-project `show`. `startDate` and `deadline` are omitted when unset.
 - Every named view except `inbox` lists projects alongside to-dos, as the app does — scheduled in `today`/`upcoming`/`anytime`, deferred in `someday`, closed in `logbook`, trashed in `trash`, due in `deadlines`. Split them on `"type"` — `jq '.[] | select(.type=="project")'` for the projects, `.[] | select(.type=="task")` for the to-dos. Plain output tags a project row `(project)`.
+- `someday` is the deferred things not filed under a project: Someday projects and unparented Someday to-dos. A to-do inside a project stays inside it however it is deferred, so it is not a `someday` row even when its project is in Someday too. Reach those with `things --project "Name"` — `things someday --project "Name"` is rejected, because no `someday` row has a parent project for it to match.
 - `logbook` is everything closed, not just everything finished: cancelled items sit beside completed ones, as they do in the app's Logbook. Split them on `"status"` — `"completed"` or `"cancelled"`; plain output prints `[x]` and `[~]`. Filter with `jq '.[] | select(.status=="completed")'` when you mean finished rather than closed.
 - `things projects` also reports `taskCount` and `openCount`. `taskCount` is every untrashed to-do in the project; `openCount` is the ones still open. The difference is the ones that are no longer open, which means completed or cancelled. To-dos filed under a project heading count towards both; the heading rows themselves never do, and neither do trashed to-dos or checklist items. Both numbers are Things' own bookkeeping, read straight from the database rather than recounted by the CLI.
 - Human output is styled and column-aligned; colour auto-disables when piping or under `NO_COLOR`. `--color=always|never` overrides. JSON is unaffected.