diff --git a/TESTING.md b/TESTING.md
index 8155f912..bc086bee 100644
--- a/TESTING.md
+++ b/TESTING.md
@@ -2157,10 +2157,35 @@ Recorded deviations on this page:
   view" filters are active, and plain "Filters" otherwise; the text is its accessible
   name, so the count is spoken. The concept has no indicator, and without one a Tags
   filter set by Tags & categories Browse was invisible on the shelf. The Library counts
-  Tags; Images counts Source, Folder, Media and Tags (each once). The toolbar category is
+  Tags, Folder and Tag match (D150); Images counts Source, Folder, Media and Tags (each once). The toolbar category is
   not a Refine filter and is not counted. The caption's count is a `role="status"`
   region, written only when it changes and kept shown while the shelf reloads, so
   Load more and scrolling never re-announce it.
+- **D150** (#444, cutover #334): "Refine this view" on the Library holds the concept
+  Filters dialog's **Folder** ("All output folders", then each folder below an output
+  root indented by depth, read from `GET /prompt_manager/library/options?include=folders`
+  when the dialog opens; the chosen folder stays listed even when the list lacks it) and
+  **Tags**, plus **Tag match** ("All of these tags" / "Any of these tags") drawn as the
+  concept's own select; the concept's "Prompt evidence" and prototype note are absent.
+  `GET /prompt_manager/library` takes `folder` (`/`-joined, `\` read as `/`; `.`, `..`,
+  empty segments and drives are 400) and `tag_mode` (`all` default, `any`), and echoes
+  both; a client whose non-default value is not echoed (an un-restarted older server)
+  shows the read error, never the unfiltered shelf. A folder keeps a parent with one
+  linked image (`generated_images.prompt_id`) in it or below it under any spelling of
+  any output root (the root as configured or detected and after `realpath`, so a
+  symlinked output folder works): `file_path` (`normcase(normpath(abspath))`) is
+  compared with prefixes built by the same normalization, so case folding is the
+  platform's own, including non-ASCII on Windows. The folder is an outer AND around the
+  parent and pair arms; Any puts one `t.name IN (...)` in each arm, so a card matches
+  when the parent or one active pair carries any tag (text and category still AND
+  inside each arm); with one tag Any equals All. Filters counts Tags, Folder and a Tag
+  match other than All (D44). Saved Library views store `tag_mode` (`all|any`) and
+  `folder` (text 1024); older rows read the defaults. Tests:
+  `tests/test_library_folders.py` (pure prefixes and names with `posixpath`/`ntpath`,
+  drive, UNC, non-ASCII, symlinked root, the any-tag union), `test_api_library.py`,
+  `test_saved_views.py`, the library-state and saved-views JS units, and
+  `tests/browser/workspace-library-filters.spec.mjs` (behavior, the Refine dialog against
+  the concept Filters dialog, artifact captures). Windows: run `portability.yml` on the PR.
 
 `tests/browser/library-concept.spec.mjs` compares the shelf (#249 E3) on the
 concept-shaped fixture, which creates the concept's prompts last to first so Recently
@@ -6036,8 +6061,8 @@ Deploying this backend needs a ComfyUI restart (Python and route changes).
 
 `#/tags` ("Tags & categories", page title "Tags") is a native workspace route; it no
 longer hands off to the legacy tag manager. That page stays reachable from Overview's
-"Open existing tag manager" card for tag search and sort, the untagged entry and
-multi-tag AND/OR browsing; bulk prompt actions (delete, tag, category) stay on the
+"Open existing tag manager" card for tag search and sort and the untagged entry
+(multi-tag OR moved to the Library's Tag match with D150, #444); bulk prompt actions (delete, tag, category) stay on the
 legacy admin page. A prompt's category is changed in the Prompt library editor or with
 the legacy admin page's "Set Category" (`POST /prompt_manager/bulk/category`, unchanged);
 the Images selection bar's Set category sets images' own categories only (D140, #332),
diff --git a/database/library.py b/database/library.py
index d91677be..f57a9d77 100644
--- a/database/library.py
+++ b/database/library.py
@@ -5,6 +5,7 @@ import sqlite3
 from collections.abc import Iterator
 from contextlib import contextmanager
 
+from .library_folders import folder_condition, list_library_folders
 from .library_tokens import library_edit_token
 
 _ELIGIBLE = """(EXISTS(SELECT 1 FROM prompt_pairs ep WHERE ep.positive_prompt_id=p.id)
@@ -121,7 +122,44 @@ def _archive(value: str) -> str:
     return ARCHIVE_SCOPES[value]
 
 
-def _filter(text: str, category: str | None, tags: list[str]) -> tuple[str, list]:
+# How the Tags filter matches (#444): every tag (AND) or any of them (OR).
+TAG_MODES = ("all", "any")
+
+
+def _tag_mode(tag_mode: object) -> str:
+    if not isinstance(tag_mode, str) or tag_mode not in TAG_MODES:
+        raise ValueError("tag_mode must be one of " + ", ".join(TAG_MODES))
+    return tag_mode
+
+
+def _tag_conditions(tags: list[str], any_tag: bool) -> tuple[list, list, list]:
+    """Parent-arm and pair-arm tag conditions and the tags' parameters."""
+    parent_exists = (
+        "EXISTS(SELECT 1 FROM prompt_tags pt JOIN tags t ON t.id=pt.tag_id "
+        "WHERE pt.prompt_id=p.id AND t.name{test})"
+    )
+    pair_exists = (
+        "EXISTS(SELECT 1 FROM prompt_pair_tags pt JOIN tags t ON t.id=pt.tag_id "
+        "WHERE pt.pair_id=pp.id AND t.name{test})"
+    )
+    if any_tag and tags:
+        # One condition per arm: the card, or one active pair, carries any tag.
+        test = " IN (" + ",".join("?" for _ in tags) + ")"
+        return [parent_exists.format(test=test)], [pair_exists.format(test=test)], tags
+    return (
+        [parent_exists.format(test="=?") for _ in tags],
+        [pair_exists.format(test="=?") for _ in tags],
+        tags,
+    )
+
+
+def _filter(
+    text: str,
+    category: str | None,
+    tags: list[str],
+    tag_mode: str = "all",
+    folder_prefixes: list[str] | None = None,
+) -> tuple[str, list]:
     if not isinstance(text, str) or len(text) > 500:
         raise ValueError("Search text must be a string of at most 500 characters")
     if category is not None and (not isinstance(category, str) or len(category) > 200):
@@ -146,17 +184,13 @@ def _filter(text: str, category: str | None, tags: list[str]) -> tuple[str, list
         pair.append("pp.category=?")
         parent_params.append(category)
         pair_params.append(category)
-    for tag in tags:
-        parent.append(
-            "EXISTS(SELECT 1 FROM prompt_tags pt JOIN tags t ON t.id=pt.tag_id "
-            "WHERE pt.prompt_id=p.id AND t.name=?)"
-        )
-        pair.append(
-            "EXISTS(SELECT 1 FROM prompt_pair_tags pt JOIN tags t ON t.id=pt.tag_id "
-            "WHERE pt.pair_id=pp.id AND t.name=?)"
-        )
-        parent_params.append(tag)
-        pair_params.append(tag)
+    parent_tags, pair_tags, tag_params = _tag_conditions(
+        tags, _tag_mode(tag_mode) == "any"
+    )
+    parent.extend(parent_tags)
+    pair.extend(pair_tags)
+    parent_params.extend(tag_params)
+    pair_params.extend(tag_params)
     condition = (
         "("
         + (" AND ".join(parent) or "1=1")
@@ -168,7 +202,13 @@ def _filter(text: str, category: str | None, tags: list[str]) -> tuple[str, list
         + " AND ".join(pair)
         + ")"
     )
-    return f"({_ELIGIBLE}) AND ({condition})", [*parent_params, *pair_params]
+    params = [*parent_params, *pair_params]
+    if folder_prefixes:
+        # A whole-card condition around both arms: images link to the parent.
+        folder, folder_params = folder_condition(folder_prefixes)
+        condition = f"({condition}) AND {folder}"
+        params.extend(folder_params)
+    return f"({_ELIGIBLE}) AND ({condition})", params
 
 
 class LibraryOperations:
@@ -251,6 +291,8 @@ class LibraryOperations:
         text: str = "",
         category: str | None = None,
         tags: list[str] | None = None,
+        tag_mode: str = "all",
+        folder_prefixes: list[str] | None = None,
         sort: str = "newest",
         limit: int = 40,
         after: dict | None = None,
@@ -258,7 +300,9 @@ class LibraryOperations:
         _limit(limit)
         if sort not in _ORDERS:
             raise ValueError("Unknown library sort order")
-        where, params = _filter(text, category, [] if tags is None else tags)
+        where, params = _filter(
+            text, category, [] if tags is None else tags, tag_mode, folder_prefixes
+        )
         if after is not None:
             if (
                 not isinstance(after, dict)
@@ -311,6 +355,8 @@ class LibraryOperations:
             "items": rows,
             "total": total,
             "variant_total": variant_total,
+            # Echoed so a client can tell this read applied its tag match.
+            "tag_mode": tag_mode,
             "has_more": has_more,
             "next_key": next_key,
         }
@@ -321,6 +367,8 @@ class LibraryOperations:
         text: str = "",
         category: str | None = None,
         tags: list[str] | None = None,
+        tag_mode: str = "all",
+        folder_prefixes: list[str] | None = None,
         sort: str = "newest",
         limit: int = 40,
         after: dict | None = None,
@@ -333,6 +381,8 @@ class LibraryOperations:
                 text=text,
                 category=category,
                 tags=tags,
+                tag_mode=tag_mode,
+                folder_prefixes=folder_prefixes,
                 sort=sort,
                 limit=limit,
                 after=after,
@@ -463,9 +513,13 @@ class LibraryOperations:
             "categories": [row["category"] for row in rows],
         }
 
-    def get_library_options(self) -> dict:
+    def get_library_options(self, folder_roots=None) -> dict:
+        """Categories; with *folder_roots* (root spellings) also ``folders``."""
         with self.library_snapshot() as (conn, epoch, _ceiling):
-            return self._get_library_options(conn, epoch)
+            result = self._get_library_options(conn, epoch)
+            if folder_roots is not None:
+                result["folders"] = list_library_folders(conn, folder_roots, _ELIGIBLE)
+            return result
 
     def get_library_previews(self, positive_ids: list[int]) -> dict[int, list[dict]]:
         """Read at most two links per parent in one bounded page query."""
diff --git a/database/library_folders.py b/database/library_folders.py
new file mode 100644
index 00000000..24767957
--- /dev/null
+++ b/database/library_folders.py
@@ -0,0 +1,111 @@
+"""Library output-folder filter (#444): folder names, root prefixes and listing.
+
+A folder is a ``/``-joined path relative to an output root, as Images' folder
+filter and the legacy ``/prompt_manager/subfolders`` name them. A parent
+matches a folder when one of its linked images (``generated_images.prompt_id``,
+the link its previews and image count read) lies in that folder or below it,
+under any spelling of any output root.
+
+Matching compares ``generated_images.file_path``, which is always
+``normcase(normpath(abspath(path)))`` (``models.normalize_image_path``), with
+prefixes built by the same normalization here, so case folding is the
+platform's own on both sides (Windows folds non-ASCII too, unlike SQLite's
+``lower()``) and the comparison is an exact ``substr`` with no wildcards.
+"""
+
+import os
+import sqlite3
+
+_MAX_FOLDER = 1024
+_MAX_PREFIXES = 64
+
+
+def normalize_folder(value: object) -> str:
+    """The folder as ``a/b``: ``\\`` read as ``/``, outer slashes dropped.
+
+    Empty means no folder filter. ``.``/``..``/empty segments, a drive or
+    control characters are refused: the value only ever names a folder below a
+    root, never a path of its own.
+    """
+    if not isinstance(value, str) or len(value) > _MAX_FOLDER:
+        raise ValueError(f"folder must be text of at most {_MAX_FOLDER} characters")
+    folder = value.replace("\\", "/").strip("/")
+    if not folder:
+        return ""
+    parts = folder.split("/")
+    if (
+        any(part in ("", ".", "..") for part in parts)
+        or ":" in parts[0]
+        or any(ord(char) < 32 or ord(char) == 127 for char in folder)
+    ):
+        raise ValueError("folder must be a folder below an output root")
+    return folder
+
+
+def _base(root: object, pathmod) -> str:
+    return pathmod.normcase(pathmod.normpath(str(root)))
+
+
+def folder_prefixes(roots, folder: str, pathmod=os.path) -> list[str]:
+    """One ``file_path`` prefix per root spelling for a normalized folder."""
+    prefixes = []
+    for root in roots:
+        joined = pathmod.join(_base(root, pathmod), *folder.split("/"))
+        prefix = pathmod.normcase(pathmod.normpath(joined)) + pathmod.sep
+        if prefix not in prefixes:
+            prefixes.append(prefix)
+    if not prefixes or len(prefixes) > _MAX_PREFIXES:
+        raise ValueError("No output folder to filter by")
+    return prefixes
+
+
+def folder_condition(prefixes: list[str]) -> tuple[str, list]:
+    """A condition on alias ``p``: one linked image under any prefix."""
+    tests = " OR ".join("substr(fg.file_path,1,?)=?" for _ in prefixes)
+    params = [value for prefix in prefixes for value in (len(prefix), prefix)]
+    return (
+        "EXISTS(SELECT 1 FROM generated_images fg WHERE fg.prompt_id=p.id "
+        f"AND ({tests}))",
+        params,
+    )
+
+
+def relative_folder(image_path: str, roots, pathmod=os.path) -> str | None:
+    """The folder of *image_path* below the first root spelling holding it.
+
+    The spelling of the stored path is kept (its case on Windows); ``None``
+    for an image directly in a root or outside every root.
+    """
+    directory = pathmod.normpath(pathmod.dirname(image_path))
+    folded = pathmod.normcase(directory)
+    for root in roots:
+        base = _base(root, pathmod)
+        start = base if base.endswith(pathmod.sep) else base + pathmod.sep
+        if not folded.startswith(start):
+            continue
+        # normcase keeps the length for ordinary names; else show the folded form.
+        rest = (directory if len(directory) == len(folded) else folded)[len(start) :]
+        parts = rest.split(pathmod.sep)
+        if any(part in ("", ".", "..") for part in parts):
+            return None
+        return "/".join(parts)
+    return None
+
+
+def list_library_folders(
+    conn: sqlite3.Connection, roots, eligible: str, pathmod=os.path
+) -> list[str]:
+    """Every folder (and ancestor) holding an image of an eligible parent."""
+    folders = set()
+    for (image_path,) in conn.execute(
+        "SELECT DISTINCT g.image_path FROM generated_images g "
+        "JOIN prompts p ON p.id=g.prompt_id WHERE " + eligible
+    ):
+        if not isinstance(image_path, str) or not image_path:
+            continue
+        folder = relative_folder(image_path, roots, pathmod)
+        if folder is None:
+            continue
+        parts = folder.split("/")
+        folders.update("/".join(parts[:index]) for index in range(1, len(parts) + 1))
+    return sorted(folders, key=lambda value: (value.casefold(), value))
diff --git a/database/saved_views.py b/database/saved_views.py
index 3a4d7afa..a95ce5fc 100644
--- a/database/saved_views.py
+++ b/database/saved_views.py
@@ -33,6 +33,8 @@ MAX_TAG_LENGTH = 50
 _IMAGE_SORTS = ("newest", "oldest", "name", "name-desc", "rating")
 _LIBRARY_SORTS = ("newest", "oldest", "name", "rating")
 _MEDIA = ("all", "image", "video")
+# How a Library view's Tags match (#444): every tag or any of them.
+_TAG_MODES = ("all", "any")
 _CONTROL = re.compile(r"[\x00-\x1f\x7f]")
 _SOURCE = re.compile(r"all|0|[1-9][0-9]{0,8}")
 # A collection id as the listing's ``collection`` query takes it (#331): none
@@ -67,6 +69,9 @@ _STATE_FIELDS = {
         "category": ("text", 100, ""),
         "sort": ("choice", _LIBRARY_SORTS, "newest"),
         "tags": ("tags", None, ()),
+        # #444: the Tags match and the output folder (relative, "/"-joined).
+        "tag_mode": ("choice", _TAG_MODES, "all"),
+        "folder": ("text", 1024, ""),
     },
 }
 
diff --git a/py/api/library.py b/py/api/library.py
index 2e3dc4b5..be699e70 100644
--- a/py/api/library.py
+++ b/py/api/library.py
@@ -21,9 +21,11 @@ from .pairs import pair_response
 try:
     from ...database.library import ARCHIVE_SCOPES
     from ...database.library_commands import LibraryCommandError
+    from ...database.library_folders import folder_prefixes, normalize_folder
 except ImportError:
     from database.library import ARCHIVE_SCOPES
     from database.library_commands import LibraryCommandError
+    from database.library_folders import folder_prefixes, normalize_folder
 
 _SECRET = os.urandom(32)
 
@@ -283,36 +285,84 @@ class LibraryRoutesMixin:
         outputs = list(self._get_all_output_dirs())
         return self._media_roots(outputs), len(outputs)
 
+    def _library_root_spellings(self) -> list[str]:
+        """Every spelling of each output root (#444 folder filter): the
+        validated, resolved root and each configured or detected path that
+        resolves to it, so images saved through a symlinked root match."""
+        from ..config import GalleryConfig
+
+        roots = [str(root) for root in self._get_all_output_dirs()]
+        candidates = [
+            *GalleryConfig.MONITORING_DIRECTORIES,
+            self._find_comfyui_output_dir(),
+            *self._comfyui_output_dir_list(),
+        ]
+        spellings = []
+        for root in roots:
+            for value in (root, *candidates):
+                if not value or not isinstance(value, (str, os.PathLike)):
+                    continue
+                value = str(value)
+                same = value == root or os.path.normcase(
+                    os.path.realpath(value)
+                ) == os.path.normcase(root)
+                if same and value not in spellings:
+                    spellings.append(value)
+        return spellings
+
     @pair_response
     async def get_library_options(self, request: web.Request) -> web.Response:
-        result = await self._run_in_executor(self.db.get_library_options)
+        include = request.query.get("include", "")
+        if include not in ("", "folders"):
+            raise ValueError("include must be empty or 'folders'")
+        if include:
+            # Folders are read only when Refine opens (a walk of linked paths).
+            roots = await self._run_in_executor(self._library_root_spellings)
+            result = await self._run_in_executor(self.db.get_library_options, roots)
+        else:
+            result = await self._run_in_executor(self.db.get_library_options)
         return web.json_response({"success": True, **result})
 
     @pair_response
     async def list_library(self, request: web.Request) -> web.Response:
+        folder = normalize_folder(request.query.get("folder", ""))
         options = {
             "text": request.query.get("text", ""),
             "category": request.query.get("category"),
             "tags": sorted(set(request.query.getall("tag", []))),
+            "tag_mode": request.query.get("tag_mode", "all"),
             "sort": request.query.get("sort", "newest"),
         }
         limit = _page_limit(request)
         cursor = request.query.get("cursor")
+        roots = (
+            await self._run_in_executor(self._library_root_spellings) if folder else []
+        )
+        prefixes = folder_prefixes(roots, folder) if folder else None
 
         def read() -> tuple[dict, dict]:
             with self.db.library_snapshot(include_ceiling=True) as snapshot:
                 conn, epoch, ceiling = snapshot
+                # The folder and the roots it was resolved under join the scope.
                 scope = _scope(
-                    {"kind": "parents", "projection": 2, "epoch": epoch, **options}
+                    {
+                        "kind": "parents",
+                        "projection": 2,
+                        "epoch": epoch,
+                        **options,
+                        **({"folder": folder, "roots": roots} if folder else {}),
+                    }
                 )
                 result = self.db._list_library(
                     conn,
                     epoch,
                     ceiling,
                     **options,
+                    folder_prefixes=prefixes,
                     limit=limit,
                     after=_decode(cursor, scope),
                 )
+                result["folder"] = folder
                 records = self.db.get_library_previews(
                     [parent["id"] for parent in result["items"]]
                 )
diff --git a/tests/browser/workspace-library-filters.spec.mjs b/tests/browser/workspace-library-filters.spec.mjs
new file mode 100644
index 00000000..8a31cee9
--- /dev/null
+++ b/tests/browser/workspace-library-filters.spec.mjs
@@ -0,0 +1,128 @@
+// #444 (D150): the Library's output-folder filter and multi-tag OR in "Refine this view", against the real server, and
+// the Refine dialog against the concept's Filters dialog (app.js:1345-1352).
+import {writeFile} from 'node:fs/promises';
+import {startCoverage,saveCoverage} from '../../tools/vendor/browser-coverage.mjs';
+import {test,expect} from './fixtures.mjs';
+import {captureCanonicalState} from './history-canonical-comparison.mjs';
+import {inventoryOf,diffInventory} from './library-editor-canonical-comparison.mjs';
+
+const route='/prompt_manager/workspace#/library';
+const concept='/__test__/canonical/workspace';
+const cards=page=>page.locator('article[data-prompt-id]');
+const card=(page,text)=>cards(page).filter({has:page.getByText(text,{exact:true})});
+const toolbar=page=>page.locator('#workspace-main search.toolbar');
+const filtersButton=page=>toolbar(page).getByRole('button',{name:/^Filters(?: · \d)?$/});
+const refine=page=>page.getByRole('dialog',{name:'Refine this view',exact:true});
+const folder=page=>refine(page).getByRole('combobox',{name:'Folder',exact:true});
+const tags=page=>refine(page).getByRole('textbox',{name:'Tags',exact:true});
+const match=page=>refine(page).getByRole('combobox',{name:'Tag match',exact:true});
+const apply=page=>refine(page).getByRole('button',{name:'Apply filters',exact:true});
+const caption=page=>page.locator('#workspace-main .section-caption > span').first();
+
+test.beforeEach(async({page,request,browserName})=>{
+    await startCoverage(page,browserName);await expect(await request.post('/__test__/reset',{data:{native_library:true}})).toBeOK();
+    page.libraryErrors=[];page.on('pageerror',error=>page.libraryErrors.push(error.message));
+});
+test.afterEach(async({page,browserName})=>{await saveCoverage(page,browserName);expect(page.libraryErrors).toEqual([]);});
+
+async function open(page) {
+    await page.goto(route);await expect(caption(page)).toHaveText(/^3 positive prompts · /);
+}
+/** Open Refine and wait for the folder list it reads on opening. */
+async function openRefine(page) {
+    const folders=page.waitForResponse(item=>new URL(item.url()).pathname==='/prompt_manager/library/options'&&new URL(item.url()).searchParams.get('include')==='folders');
+    await filtersButton(page).click();await expect(refine(page)).toBeVisible();await folders;
+}
+
+test('Refine offers Folder, Tags and Tag match; a folder narrows the shelf to prompts with images there',async({page})=>{
+    await open(page);await openRefine(page);
+    await expect(refine(page).locator('.field label')).toHaveText(['Folder','Tags','Tag match']);
+    // Both roots hold a "shared" folder; the root's own images name no folder.
+    await expect(folder(page).locator('option')).toHaveText(['All output folders','shared']);
+    await expect(match(page).locator('option')).toHaveText(['All of these tags','Any of these tags']);
+    await folder(page).selectOption('shared');await apply(page).click();
+    await expect(caption(page)).toHaveText(/^1 positive prompt · /);
+    await expect(cards(page)).toHaveCount(1);await expect(card(page,'Cat portrait')).toHaveCount(1);
+    await expect(filtersButton(page)).toHaveText('Filters · 1');
+    await openRefine(page);await expect(folder(page)).toHaveValue('shared');
+    await refine(page).getByRole('button',{name:'Clear filters',exact:true}).click();
+    await expect(caption(page)).toHaveText(/^3 positive prompts · /);await expect(filtersButton(page)).toHaveText('Filters');
+});
+
+test('Tag match Any shows every prompt carrying one of the tags; changing only the match applies it',async({page})=>{
+    await open(page);await openRefine(page);
+    await tags(page).fill('cats, dogs');await apply(page).click();
+    await expect(caption(page)).toHaveText(/^0 positive prompts · /);await expect(filtersButton(page)).toHaveText('Filters · 1');
+    await openRefine(page);await match(page).selectOption('any');await apply(page).click();
+    await expect(caption(page)).toHaveText(/^2 positive prompts · /);
+    await expect(cards(page)).toHaveCount(2);await expect(card(page,'Cat portrait')).toHaveCount(1);await expect(card(page,'Dog landscape')).toHaveCount(1);
+    await expect(filtersButton(page)).toHaveText('Filters · 2');
+});
+
+test('a saved view keeps its folder and tag match',async({page})=>{
+    await open(page);await openRefine(page);
+    await folder(page).selectOption('shared');await tags(page).fill('cats, dogs');await match(page).selectOption('any');await apply(page).click();
+    await expect(caption(page)).toHaveText(/^1 positive prompt · /);
+    await toolbar(page).getByRole('button',{name:'Save view',exact:true}).click();
+    const save=page.getByRole('dialog',{name:'Save this view',exact:true});
+    await save.getByRole('textbox',{name:'View name',exact:true}).fill('Shared cats or dogs');
+    const created=page.waitForResponse(item=>new URL(item.url()).pathname==='/prompt_manager/saved-views'&&item.request().method()==='POST');
+    await save.getByRole('button',{name:'Save',exact:true}).click();
+    const body=(await created).request().postDataJSON();
+    expect(body.state).toMatchObject({folder:'shared',tag_mode:'any',tags:['cats','dogs']});
+    await page.goto('about:blank');await open(page);
+    await page.getByRole('navigation',{name:'Saved views',exact:true}).getByRole('link',{name:'Shared cats or dogs',exact:true}).click();
+    await expect(caption(page)).toHaveText(/^1 positive prompt · /);await expect(filtersButton(page)).toHaveText('Filters · 3');
+});
+
+test('a chosen folder missing from the folder list stays listed and chosen in Refine',async({page})=>{
+    await open(page);await openRefine(page);await folder(page).selectOption('shared');await apply(page).click();
+    await expect(caption(page)).toHaveText(/^1 positive prompt · /);
+    // The folder has no image any more as far as the list knows (or the read failed): Apply must not drop it.
+    await page.route('**/prompt_manager/library/options?include=folders',route=>route.fulfill({json:{success:true,library_epoch:'x',categories:[],folders:[]}}));
+    await openRefine(page);
+    await expect(folder(page).locator('option')).toHaveText(['All output folders','shared']);await expect(folder(page)).toHaveValue('shared');
+    await apply(page).click();await expect(caption(page)).toHaveText(/^1 positive prompt · /);await expect(filtersButton(page)).toHaveText('Filters · 1');
+});
+
+test('an older server that ignores the folder shows an error with Retry, never the whole shelf',async({page})=>{
+    await open(page);
+    await page.route('**/prompt_manager/library?*',async route=>{
+        const response=await route.fetch();const body=await response.json();delete body.folder;delete body.tag_mode;
+        await route.fulfill({response,json:body});
+    });
+    await openRefine(page);await folder(page).selectOption('shared');await apply(page).click();
+    await expect(page.locator('#workspace-main').getByText('Prompt library could not be loaded. Retry.')).toBeVisible();
+    await expect(cards(page)).toHaveCount(0);
+});
+
+// D150: the Refine dialog is the concept's Filters dialog: its Folder select and Tags input, plus Tag match drawn as the
+// concept's own select; the concept's "Prompt evidence" (no data yet) and its prototype note are not shown.
+function mapFiltersDialog(reference,{folders,matchOptions}) {
+    const [conceptFolder,,conceptTags]=reference.fields;
+    return {...reference,
+        fields:[{...conceptFolder,options:folders},{...conceptTags},{...conceptFolder,label:'Tag match',options:matchOptions}],
+        small:[],
+        // Production's Apply reads "Apply filters" (Images and Library share it, #249).
+        actions:{...reference.actions,buttons:reference.actions.buttons.map(item=>item.text==='Apply tag filter'?{...item,text:'Apply filters'}:item)}};
+}
+for(const [width,height] of [[1600,1100],[390,844]])for(const theme of ['dark','light'])test(`Refine dialog matches the concept Filters dialog ${width} ${theme} (D150)`,async({page},testInfo)=>{
+    await page.setViewportSize({width,height});
+    await page.goto('about:blank');await page.goto(`${concept}#library`);await page.getByRole('combobox',{name:'Theme',exact:true}).selectOption(theme);
+    await page.locator('#main').getByRole('button',{name:'Filters',exact:true}).click();await expect(page.locator('#modal')).toBeVisible();
+    const reference=await page.locator('#modal').evaluate(inventoryOf);
+    await captureCanonicalState(page,testInfo,`concept-filters-${width}-${theme}`,'#modal');
+    await open(page);await page.getByRole('combobox',{name:'Theme',exact:true}).selectOption(theme);await openRefine(page);
+    await expect(folder(page).locator('option')).toHaveCount(2);
+    const actual=await refine(page).evaluate(inventoryOf);
+    await captureCanonicalState(page,testInfo,`production-refine-${width}-${theme}`,'dialog[open]');
+    const expected=mapFiltersDialog(reference,{folders:[['','All output folders'],['shared','shared']],matchOptions:[['all','All of these tags'],['any','Any of these tags']]});
+    const path=testInfo.outputPath('refine-inventory.json');await writeFile(path,JSON.stringify({reference,actual},null,2));
+    await testInfo.attach('refine-inventory',{path,contentType:'application/json'});
+    expect(reference.fields.map(item=>item.label)).toEqual(['Folder','Prompt evidence','Tags']);
+    expect(diffInventory(expected,actual)).toEqual([]);
+    await refine(page).getByRole('button',{name:'Close dialog',exact:true}).click();
+    await openRefine(page);await folder(page).selectOption('shared');await tags(page).fill('cats, dogs');await match(page).selectOption('any');await apply(page).click();
+    await expect(caption(page)).toHaveText(/^1 positive prompt · /);await page.mouse.move(0,0);
+    await captureCanonicalState(page,testInfo,`production-library-folder-any-${width}-${theme}`,'#workspace-main');
+});
diff --git a/tests/browser/workspace-library.spec.mjs b/tests/browser/workspace-library.spec.mjs
index 5ef235f3..d4584ee6 100644
--- a/tests/browser/workspace-library.spec.mjs
+++ b/tests/browser/workspace-library.spec.mjs
@@ -135,7 +135,8 @@ test('Retry re-reads a failed category list with the shelf',async({page})=>{
     await page.locator('#workspace-main search.toolbar').getByRole('button',{name:'Filters',exact:true}).click();
     await refine(page).getByRole('button',{name:'Apply filters',exact:true}).click();await expect(refine(page)).toHaveCount(0);
     const search=page.getByRole('searchbox',{name:'Search workspace',exact:true});await search.fill(' ');
-    await page.waitForTimeout(400);expect(reads).toEqual([]);await expect(cards(page)).toHaveCount(3);
+    // Only the folder list Refine reads on opening (D150), never the shelf.
+    await page.waitForTimeout(400);expect(reads).toEqual(['/prompt_manager/library/options']);await expect(cards(page)).toHaveCount(3);
 });
 
 test('failed library reads retry while late search responses cannot overwrite newer results',async({page})=>{
@@ -168,7 +169,7 @@ test('library toolbar matches the concept and tags live in Refine this view',asy
     // D44: the active Tags filter shows on the button; the category is the toolbar's own and is not counted.
     await expect(toolbar.getByRole('button')).toHaveText(['Save view','Filters · 1']);
     await toolbar.getByRole('button',{name:'Filters · 1',exact:true}).click();
-    await expect(refine(page).locator('.field label')).toHaveText(['Tags']);await expect(refine(page).getByRole('textbox',{name:'Tags',exact:true})).toHaveValue('studio');
+    await expect(refine(page).locator('.field label')).toHaveText(['Folder','Tags','Tag match']);await expect(refine(page).getByRole('textbox',{name:'Tags',exact:true})).toHaveValue('studio');
     await refine(page).getByRole('button',{name:'Clear filters',exact:true}).click();await expect(refine(page)).toHaveCount(0);
     await expect(toolbar.getByRole('button',{name:'Filters',exact:true})).toBeFocused();
     await expect(page.getByRole('combobox',{name:'Filter by category',exact:true})).toHaveValue('');await expect(cards(page)).toHaveCount(3);
diff --git a/tests/browser/workspace-saved-views.spec.mjs b/tests/browser/workspace-saved-views.spec.mjs
index b29f16a1..4ca44275 100644
--- a/tests/browser/workspace-saved-views.spec.mjs
+++ b/tests/browser/workspace-saved-views.spec.mjs
@@ -208,7 +208,7 @@ test('a view stored under older rules still lists and opens with its usable valu
     await raw({ page: 'library', name: '', state: JSON.stringify({ q: 'dog', sort: 'name-desc' }) });
     expect(await listed(request)).toEqual([
         { id: imagesId, page: 'images', name: 'Old cats', state: { ...IMAGE_DEFAULTS, q: 'cat' } },
-        expect.objectContaining({ page: 'library', name: 'Saved view', state: { q: 'dog', category: '', sort: 'newest', tags: [] } }),
+        expect.objectContaining({ page: 'library', name: 'Saved view', state: { q: 'dog', category: '', sort: 'newest', tags: [], tag_mode: 'all', folder: '' } }),
     ]);
     // A state that is no JSON object is never listed, and its link behaves like a missing view.
     const corruptId = await raw({ page: 'images', name: 'Corrupt', state: '{not json' });
@@ -232,7 +232,7 @@ test('a view stored under older rules still lists and opens with its usable valu
 
 test('leaving a saved view returns Images and the Library to their own last state (#249 M2)', async ({ page, request }) => {
     const dogs = await create(request, { page: 'images', name: 'Dogs', state: { ...IMAGE_DEFAULTS, q: 'dogs' } });
-    const cats = await create(request, { page: 'library', name: 'Cats', state: { q: 'cat', category: '', sort: 'newest', tags: [] } });
+    const cats = await create(request, { page: 'library', name: 'Cats', state: { q: 'cat', category: '', sort: 'newest', tags: [], tag_mode: 'all', folder: '' } });
     await page.goto(`${workspace}#/images`);
     await search(page).fill('cat');
     await expect(imageCards(page)).toHaveCount(1);
@@ -275,7 +275,7 @@ test('a toolbar change while sources load keeps the saved Source and Folder (#24
 });
 
 test('a saved view left while its list or rename is pending leaves the next page alone', async ({ page, request }) => {
-    const view = await create(request, { page: 'library', name: 'Cats', state: { q: 'cat', category: '', sort: 'newest', tags: [] } });
+    const view = await create(request, { page: 'library', name: 'Cats', state: { q: 'cat', category: '', sort: 'newest', tags: [], tag_mode: 'all', folder: '' } });
     let releaseList = () => {};
     const holdList = async () => {
         const held = new Promise(resolve => { releaseList = resolve; });
@@ -323,7 +323,7 @@ test('an unknown saved view opens Images, and a failed listing offers Retry', as
     await expect(page).toHaveURL(/#\/images$/);
     await expect(main(page).getByRole('heading', { level: 1 })).toHaveText('Images');
 
-    const view = await create(request, { page: 'library', name: 'Cats', state: { q: 'cat', category: '', sort: 'newest', tags: [] } });
+    const view = await create(request, { page: 'library', name: 'Cats', state: { q: 'cat', category: '', sort: 'newest', tags: [], tag_mode: 'all', folder: '' } });
     let failing = true;
     await page.route(`**${API}`, route => failing && route.request().method() === 'GET'
         ? route.fulfill({ status: 500, contentType: 'application/json', body: '{"success":false,"error":"down"}' })
@@ -514,7 +514,7 @@ test('Edit renames an open view, and deletes it only after confirming inside the
 });
 
 test('a deleted Library view returns to the Library, and failed edits say so', async ({ page, request }) => {
-    const view = await create(request, { page: 'library', name: 'Cats', state: { q: 'cat', category: '', sort: 'newest', tags: [] } });
+    const view = await create(request, { page: 'library', name: 'Cats', state: { q: 'cat', category: '', sort: 'newest', tags: [], tag_mode: 'all', folder: '' } });
     await page.goto(`${workspace}#/saved/${view.id}`);
     await expect(heading(page)).toHaveText('Cats');
     const edit = main(page).locator('.heading-actions > button').first();
diff --git a/tests/js/workspace-library-state.test.js b/tests/js/workspace-library-state.test.js
index 2442364f..4d6f9e3c 100644
--- a/tests/js/workspace-library-state.test.js
+++ b/tests/js/workspace-library-state.test.js
@@ -104,3 +104,17 @@ test('archived variant reads use their own scope and cursor without changing the
  const active=[];const plain=createLibraryDetail({api:{get:async url=>{active.push(url);return {positive:item(1),variants:[]};}},onChange:()=>{}});await plain.load(1);assert.equal(new URL(active[0],'https://x').searchParams.has('archive'),false);
  assert.throws(()=>createLibraryDetail({api:{},onChange:()=>{},archive:'parents'}));
 });
+test('tag mode any and a folder are sent, echoed and validated (#444)',async()=>{
+ const {createLibraryStream,LIBRARY_TAG_MODES}=await source;assert.deepEqual(LIBRARY_TAG_MODES,['all','any']);
+ const calls=[];const pending=[{...page([item(1)]),tag_mode:'any',folder:'2026/Aug'},{...page([item(2)]),tag_mode:'all',folder:''},page([item(3)]),{...page([item(4)]),tag_mode:'all'}];
+ const s=createLibraryStream({api:{get:async(url)=>{calls.push(new URL(url,'https://x').searchParams);return pending.shift();}}});
+ assert.equal(await s.reset({tags:['a','b'],tagMode:'any',folder:'2026/Aug'}),1);
+ assert.equal(calls[0].get('tag_mode'),'any');assert.equal(calls[0].get('folder'),'2026/Aug');assert.deepEqual(calls[0].getAll('tag'),['a','b']);
+ // An older server that ignored them answers without the echo: an error, never the unfiltered shelf.
+ assert.equal(await s.reset({tags:['a','b'],tagMode:'any',folder:'2026/Aug'}),0);assert.ok(s.state.error instanceof TypeError);
+ // The defaults send neither, so they need no echo.
+ assert.equal(await s.reset({tagMode:'all',folder:''}),1);assert.equal(calls[2].has('tag_mode'),false);assert.equal(calls[2].has('folder'),false);
+ assert.equal(await s.reset({folder:'x'}),0);assert.ok(s.state.error instanceof TypeError,'a folder without its echo is refused');
+ await assert.rejects(s.reset({tagMode:'or'}),TypeError);await assert.rejects(s.reset({folder:3}),TypeError);
+ assert.equal(calls.length,4);s.dispose();
+});
diff --git a/tests/js/workspace-saved-views.test.js b/tests/js/workspace-saved-views.test.js
index 46d2fe06..d309390c 100644
--- a/tests/js/workspace-saved-views.test.js
+++ b/tests/js/workspace-saved-views.test.js
@@ -5,7 +5,7 @@ const assert = require('node:assert/strict');
 const source = import('../../web/js/workspace/saved-views.mjs');
 
 const IMAGE_DEFAULTS = { q: '', category: '', sort: 'newest', source: 'all', folder: '', media: 'all', tags: [], favorites: false, collection: '' };
-const LIBRARY_DEFAULTS = { q: '', category: '', sort: 'newest', tags: [] };
+const LIBRARY_DEFAULTS = { q: '', category: '', sort: 'newest', tags: [], tag_mode: 'all', folder: '' };
 
 test('a saved state always holds every page key and keeps only values its page accepts', async () => {
     const { normalizeViewState, SAVED_VIEW_PAGES } = await source;
@@ -31,8 +31,8 @@ test('a saved state always holds every page key and keeps only values its page a
     assert.deepEqual(normalizeViewState('images', { ...full, q: 'x'.repeat(501), folder: 7, tags: Array(21).fill('t') }),
         { ...full, q: '', folder: '', tags: [] });
     assert.deepEqual(normalizeViewState('images', { ...full, category: 'bad\u0007', tags: [' '] }), { ...full, category: '', tags: [] });
-    // Library has no source, folder or media, and no Name Z–A.
-    assert.deepEqual(normalizeViewState('library', { ...full, sort: 'name-desc' }), { q: 'castle', category: 'Portraits', sort: 'newest', tags: ['moody', 'fog'] });
+    // Library has no source or media, and no Name Z–A; its folder (#444) is the Library's own.
+    assert.deepEqual(normalizeViewState('library', { ...full, sort: 'name-desc' }), { q: 'castle', category: 'Portraits', sort: 'newest', tags: ['moody', 'fog'], tag_mode: 'all', folder: 'a/b' });
     assert.deepEqual(normalizeViewState('library', { sort: 'oldest' }), { ...LIBRARY_DEFAULTS, sort: 'oldest' });
     // The returned tags are a copy.
     const tags = ['one'];
@@ -62,7 +62,7 @@ test('the listing keeps usable views in order and normalizes their state', async
         { id: 1, page: 'images', name: 'Videos', state: { media: 'video', source: '9' } },
     ] });
     assert.deepEqual(views, [
-        { id: 3, page: 'library', name: 'Neon', state: { q: 'neon', category: '', sort: 'name', tags: [] } },
+        { id: 3, page: 'library', name: 'Neon', state: { q: 'neon', category: '', sort: 'name', tags: [], tag_mode: 'all', folder: '' } },
         { id: 1, page: 'images', name: 'Videos', state: { ...IMAGE_DEFAULTS, media: 'video', source: '9' } },
     ]);
     assert.equal(parseSavedView(null), null);
@@ -84,8 +84,8 @@ test('page filters and saved states convert both ways', async () => {
     assert.equal(imagesViewState({ ...filters, collection: undefined }).collection, '');
     assert.equal(imagesViewState({ ...filters, collection: 7 }).collection, '7');
     assert.equal(imagesViewState({ ...filters, favorites: undefined }).favorites, false);
-    const shelf = { text: 'neon', category: 'Cities', sort: 'oldest', tags: ['night'] };
-    assert.deepEqual(libraryViewState(shelf), { q: 'neon', category: 'Cities', sort: 'oldest', tags: ['night'] });
+    const shelf = { text: 'neon', category: 'Cities', sort: 'oldest', tags: ['night'], tagMode: 'any', folder: '2026' };
+    assert.deepEqual(libraryViewState(shelf), { q: 'neon', category: 'Cities', sort: 'oldest', tags: ['night'], tag_mode: 'any', folder: '2026' });
     assert.deepEqual(libraryFilters(libraryViewState(shelf)), shelf);
 });
 
@@ -215,3 +215,10 @@ test('a state over the API 4 KB cap is refused before anything is sent (#249 M5)
     await assert.rejects(store.create('images', 'Big', big), error => error instanceof SavedViewTooLarge && error instanceof RangeError);
     assert.deepEqual(api.calls, []);
 });
+
+test('a Library view keeps its tag match and folder; an old view reads the defaults (#444)', async () => {
+    const { normalizeViewState, libraryFilters } = await source;
+    assert.deepEqual(normalizeViewState('library', { tag_mode: 'any', folder: '2026/Aug' }), { ...LIBRARY_DEFAULTS, tag_mode: 'any', folder: '2026/Aug' });
+    assert.deepEqual(normalizeViewState('library', { tag_mode: 'untagged', folder: 'x'.repeat(1025) }), LIBRARY_DEFAULTS);
+    assert.deepEqual(libraryFilters({ q: 'a' }), { text: 'a', category: '', sort: 'newest', tags: [], tagMode: 'all', folder: '' });
+});
diff --git a/tests/test_api_library.py b/tests/test_api_library.py
index 0e650972..292f0b83 100644
--- a/tests/test_api_library.py
+++ b/tests/test_api_library.py
@@ -97,6 +97,59 @@ class TestLibraryAPI(ImageAPITestCase):
             },
         )
 
+    async def test_folder_filter_lists_and_matches_prompts_by_output_folder(self):
+        deep = self._save_prompt("deep")
+        top = self._save_prompt("top")
+        other = self._save_prompt("other")
+        self._save_prompt("no images")
+        for prompt, parts in ((deep, ("a", "b")), (top, ("a",)), (other, ("ab",))):
+            path = make_png(self.output_dir.joinpath(*parts, f"{prompt}.png"))
+            self.api.db.link_image_to_prompt(prompt, str(path))
+        response, options = await self.get("/options", include="folders")
+        self.assertEqual(response.status, 200)
+        self.assertEqual(options["folders"], ["a", "a/b", "ab"])
+        _, plain = await self.get("/options")
+        self.assertNotIn("folders", plain)
+        _, first = await self.get(folder="a", limit=1)
+        self.assertEqual((first["total"], first["folder"]), (2, "a"))
+        _, second = await self.get(folder="\\a\\", limit=1, cursor=first["next_cursor"])
+        self.assertEqual(
+            sorted([first["items"][0]["text"], second["items"][0]["text"]]),
+            ["deep", "top"],
+        )
+        _, all_rows = await self.get()
+        self.assertEqual((all_rows["total"], all_rows["folder"]), (4, ""))
+        for params in (
+            {"folder": "a/../ab"},
+            {"folder": "C:/x"},
+            {"folder": "b", "cursor": first["next_cursor"]},
+            {"cursor": first["next_cursor"]},
+        ):
+            response, result = await self.get(limit=1, **params)
+            self.assertEqual(response.status, 400, params)
+            self.assertEqual(result["success"], False)
+        response, _ = await self.get("/options", include="tags")
+        self.assertEqual(response.status, 400)
+
+    async def test_any_tag_mode_is_sent_through_and_echoed(self):
+        self._save_prompt("a only", tags=["a"])
+        self._save_prompt("b only", tags=["b"])
+        self._save_prompt("neither")
+        _, result = await self.get(tag=["a", "b"], tag_mode="any")
+        self.assertEqual(result["tag_mode"], "any")
+        self.assertEqual(
+            sorted(i["text"] for i in result["items"]), ["a only", "b only"]
+        )
+        _, both = await self.get(tag=["a", "b"])
+        self.assertEqual((both["total"], both["tag_mode"]), (0, "all"))
+        _, first = await self.get(tag=["a", "b"], tag_mode="any", limit=1)
+        response, _ = await self.get(
+            tag=["a", "b"], limit=1, cursor=first["next_cursor"]
+        )
+        self.assertEqual(response.status, 400)
+        response, _ = await self.get(tag_mode="or")
+        self.assertEqual(response.status, 400)
+
     async def test_variant_cursor_is_positive_scoped_and_required_limits_are_bounded(
         self,
     ):
diff --git a/tests/test_library_folders.py b/tests/test_library_folders.py
new file mode 100644
index 00000000..6c61b9a9
--- /dev/null
+++ b/tests/test_library_folders.py
@@ -0,0 +1,196 @@
+"""#444: the Library's output-folder filter and multi-tag OR."""
+
+import ntpath
+import os
+import posixpath
+import tempfile
+import unittest
+from pathlib import Path
+
+from database.library_folders import (
+    folder_prefixes,
+    normalize_folder,
+    relative_folder,
+)
+from database.operations import PromptDatabase
+from utils.hashing import generate_prompt_hash
+
+
+class TestFolderNames(unittest.TestCase):
+    def test_normalize_reads_backslashes_and_strips_outer_slashes(self):
+        self.assertEqual(normalize_folder(""), "")
+        self.assertEqual(normalize_folder("/"), "")
+        self.assertEqual(normalize_folder("2026\\08-Aug\\"), "2026/08-Aug")
+        self.assertEqual(normalize_folder("/a/b/"), "a/b")
+        self.assertEqual(normalize_folder("..foo/b"), "..foo/b")
+
+    def test_normalize_refuses_anything_but_a_folder_below_a_root(self):
+        for value in ("a/../b", "./a", "a//b", "C:/x", "c:", "a\x00b", 3, "x" * 1025):
+            with self.subTest(value=value), self.assertRaises(ValueError):
+                normalize_folder(value)
+
+    def test_posix_prefixes_are_exact_and_end_in_a_separator(self):
+        self.assertEqual(
+            folder_prefixes(["/out", "/data/out/"], "a/b", posixpath),
+            ["/out/a/b/", "/data/out/a/b/"],
+        )
+        self.assertEqual(folder_prefixes(["/"], "a", posixpath), ["/a/"])
+        self.assertEqual(
+            folder_prefixes(["/out", "/out/"], "a", posixpath), ["/out/a/"]
+        )
+        with self.assertRaises(ValueError):
+            folder_prefixes([], "a", posixpath)
+
+    def test_windows_prefixes_fold_case_including_non_ascii(self):
+        self.assertEqual(
+            folder_prefixes(["C:\\ComfyUI\\Output"], "Ä/Sub", ntpath),
+            ["c:\\comfyui\\output\\ä\\sub\\"],
+        )
+        self.assertEqual(folder_prefixes(["D:\\"], "x", ntpath), ["d:\\x\\"])
+        self.assertEqual(
+            folder_prefixes(["\\\\Server\\Share\\Out"], "a", ntpath),
+            ["\\\\server\\share\\out\\a\\"],
+        )
+        # The stored file_path is normcase(normpath(abspath)), the same fold.
+        stored = ntpath.normcase(ntpath.normpath("C:/ComfyUI/output/Ä/sub/x.png"))
+        self.assertTrue(
+            stored.startswith(
+                folder_prefixes(["C:/ComfyUI/Output"], "ä/SUB", ntpath)[0]
+            )
+        )
+
+    def test_relative_folder_keeps_the_stored_spelling(self):
+        self.assertEqual(
+            relative_folder("/out/2026/Aug/x.png", ["/out"], posixpath), "2026/Aug"
+        )
+        self.assertIsNone(relative_folder("/out/x.png", ["/out"], posixpath))
+        self.assertIsNone(relative_folder("/outside/x.png", ["/out"], posixpath))
+        self.assertIsNone(relative_folder("/output2/a/x.png", ["/out"], posixpath))
+        self.assertEqual(
+            relative_folder("/out/..foo/x.png", ["/out"], posixpath), "..foo"
+        )
+        self.assertEqual(
+            relative_folder("C:\\Out\\Ä\\Sub\\x.png", ["c:\\out"], ntpath), "Ä/Sub"
+        )
+        self.assertEqual(relative_folder("D:\\a\\x.png", ["D:\\"], ntpath), "a")
+
+
+class TestLibraryFolderAndAnyTag(unittest.TestCase):
+    def setUp(self):
+        self.temp = tempfile.TemporaryDirectory()
+        base = Path(os.path.realpath(self.temp.name))
+        self.root = base / "output"
+        self.root.mkdir()
+        self.db = PromptDatabase(str(base / "folders.db"))
+
+    def tearDown(self):
+        try:
+            self.db.close_all()
+        finally:
+            self.temp.cleanup()
+
+    def save(self, text, **metadata):
+        return self.db.save_prompt(
+            text, prompt_hash=generate_prompt_hash(text), **metadata
+        )
+
+    def link(self, prompt_id, *parts):
+        path = self.root.joinpath(*parts)
+        path.parent.mkdir(parents=True, exist_ok=True)
+        path.write_bytes(b"x")
+        self.db.link_image_to_prompt(prompt_id, str(path))
+
+    def texts(self, **options):
+        return sorted(item["text"] for item in self.db.list_library(**options)["items"])
+
+    def in_folder(self, folder, roots=None):
+        return self.texts(
+            folder_prefixes=folder_prefixes(roots or [str(self.root)], folder)
+        )
+
+    def test_folder_matches_its_descendants_only(self):
+        self.link(self.save("deep"), "a", "b", "x.png")
+        self.link(self.save("top"), "a", "y.png")
+        self.link(self.save("sibling"), "ab", "z.png")
+        self.link(self.save("literal"), "100%_off", "w.png")
+        self.save("no images")
+        self.assertEqual(self.in_folder("a"), ["deep", "top"])
+        self.assertEqual(self.in_folder("a/b"), ["deep"])
+        self.assertEqual(self.in_folder("ab"), ["sibling"])
+        self.assertEqual(self.in_folder("100%_off"), ["literal"])
+        self.assertEqual(self.in_folder("1"), [])
+        cut = self.db.list_library(
+            folder_prefixes=folder_prefixes([str(self.root)], "a"), limit=1
+        )
+        self.assertEqual(cut["total"], 2)
+
+    def test_folder_combines_with_text_category_and_tags(self):
+        self.link(self.save("red cat", category="Art", tags=["cat"]), "a", "1.png")
+        self.link(self.save("red dog", category="Art", tags=["dog"]), "a", "2.png")
+        self.link(self.save("red bird", category="Art", tags=["cat"]), "b", "3.png")
+        prefixes = folder_prefixes([str(self.root)], "a")
+        self.assertEqual(
+            self.texts(folder_prefixes=prefixes, tags=["cat"]), ["red cat"]
+        )
+        self.assertEqual(
+            self.texts(folder_prefixes=prefixes, text="dog", category="Art"),
+            ["red dog"],
+        )
+
+    @unittest.skipIf(os.name == "nt", "symlinks need privileges on Windows")
+    def test_folder_listing_and_match_through_a_symlinked_root(self):
+        link = self.root.parent / "linked"
+        os.symlink(self.root, link)
+        prompt = self.save("via link")
+        (self.root / "a").mkdir()
+        (self.root / "a" / "x.png").write_bytes(b"x")
+        self.db.link_image_to_prompt(prompt, str(link / "a" / "x.png"))
+        spellings = [str(self.root), str(link)]
+        self.assertEqual(self.in_folder("a", spellings), ["via link"])
+        self.assertEqual(self.in_folder("a", [str(self.root)]), [])
+        self.assertEqual(self.db.get_library_options(spellings)["folders"], ["a"])
+
+    def test_folder_listing_offers_ancestors_and_skips_outside_images(self):
+        self.link(self.save("deep"), "2026", "08-Aug", "x.png")
+        self.link(self.save("root image"), "y.png")
+        outside = Path(self.temp.name) / "elsewhere" / "z.png"
+        outside.parent.mkdir()
+        outside.write_bytes(b"x")
+        self.db.link_image_to_prompt(self.save("outside"), str(outside))
+        options = self.db.get_library_options([str(self.root)])
+        self.assertEqual(options["folders"], ["2026", "2026/08-Aug"])
+        self.assertNotIn("folders", self.db.get_library_options())
+
+    def test_any_tag_mode_is_the_union_across_parent_and_pair(self):
+        self.save("parent a", tags=["a"])
+        self.save("parent b", tags=["b"])
+        self.save("both", tags=["a", "b"])
+        self.save("neither", tags=["c"])
+        self.db.save_prompt_pair("pair b", "noise", tags=["b"])
+        split = self.save("split", tags=["a"])
+        self.db.save_prompt_pair("split", "split noise", tags=["b"])
+        archived = self.db.save_prompt_pair("archived b", "old", tags=["b"])
+        self.db.archive_prompt_pair(archived)
+        self.assertIsInstance(split, int)
+        self.assertEqual(
+            self.texts(tags=["a", "b"], tag_mode="any"),
+            ["both", "pair b", "parent a", "parent b", "split"],
+        )
+        self.assertEqual(self.texts(tags=["a", "b"], tag_mode="all"), ["both"])
+        self.assertEqual(self.texts(tags=["a", "b"]), ["both"])
+        for tags in (["a"], ["b"], ["c"]):
+            self.assertEqual(
+                self.texts(tags=tags, tag_mode="any"), self.texts(tags=tags)
+            )
+        self.assertEqual(
+            self.texts(tags=["a", "b"], tag_mode="any", text="parent"),
+            ["parent a", "parent b"],
+        )
+        self.assertEqual(self.texts(tag_mode="any"), self.texts())
+        for mode in ("none", None, "ANY"):
+            with self.subTest(mode=mode), self.assertRaises(ValueError):
+                self.db.list_library(tag_mode=mode)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/tests/test_saved_views.py b/tests/test_saved_views.py
index 662e7573..0032da54 100644
--- a/tests/test_saved_views.py
+++ b/tests/test_saved_views.py
@@ -42,7 +42,14 @@ IMAGES_STATE = {
     "favorites": False,
     "collection": "",
 }
-LIBRARY_STATE = {"q": "", "category": "", "sort": "rating", "tags": []}
+LIBRARY_STATE = {
+    "q": "",
+    "category": "",
+    "sort": "rating",
+    "tags": [],
+    "tag_mode": "any",
+    "folder": "2026/Aug",
+}
 IMAGES_DEFAULTS = {
     "q": "",
     "category": "",
@@ -54,7 +61,14 @@ IMAGES_DEFAULTS = {
     "favorites": False,
     "collection": "",
 }
-LIBRARY_DEFAULTS = {"q": "", "category": "", "sort": "newest", "tags": []}
+LIBRARY_DEFAULTS = {
+    "q": "",
+    "category": "",
+    "sort": "newest",
+    "tags": [],
+    "tag_mode": "all",
+    "folder": "",
+}
 # A row saved by an older build: no favorites key, a retired key, a sort
 # that is no longer offered and an over-long folder.
 OLD_IMAGES_STATE = json.dumps(
@@ -228,7 +242,10 @@ class TestSavedViewsApi(ImageAPITestCase):
         favorite = await self.create(state={"favorites": True})
         self.assertIs(favorite["state"]["favorites"], True)
         for sort in ("newest", "oldest", "name", "rating"):
-            await self.create(page="library", state={"sort": sort, "tags": ["a b"]})
+            await self.create(
+                page="library",
+                state={"sort": sort, "tags": ["a b"], "tag_mode": "all", "folder": ""},
+            )
         _, listed = await self.send("GET")
         self.assertEqual(len(listed["views"]), 20)
 
@@ -675,6 +692,19 @@ class TestSavedViewsSchema(unittest.TestCase):
                 )
         self.assertEqual(normalize_state("history", {}), {})
 
+    def test_library_tag_mode_and_folder_are_kept_with_defaults_for_old_rows(self):
+        # A row from before #444 has neither key.
+        old = {"q": "", "category": "", "sort": "rating", "tags": ["a"]}
+        self.assertEqual(normalize_state("library", old), {**LIBRARY_DEFAULTS, **old})
+        self.assertEqual(
+            normalize_state("library", {"tag_mode": "untagged", "folder": 3}),
+            LIBRARY_DEFAULTS,
+        )
+        with self.assertRaises(SavedViewInvalid):
+            encode_state("library", {**LIBRARY_STATE, "tag_mode": "or"})
+        with self.assertRaises(SavedViewInvalid):
+            encode_state("library", {**LIBRARY_STATE, "folder": "x" * 1025})
+
     def test_validation_errors_are_saved_view_invalid(self):
         for call in (
             lambda: validate_name(""),
diff --git a/web/js/workspace/library-state.mjs b/web/js/workspace/library-state.mjs
index 7ba2b791..3fd7048e 100644
--- a/web/js/workspace/library-state.mjs
+++ b/web/js/workspace/library-state.mjs
@@ -12,10 +12,21 @@ function parameters(filters,limit) {
     for(const tag of filters.tags || []) if(tag.trim()) query.append('tag',tag.trim());
     const sort=filters.sort || 'newest';
     if(!['newest','oldest','name','rating'].includes(sort)) throw new TypeError('Invalid library sort');
+    // #444: how Tags match (every tag or any of them) and the output folder below a root.
+    const tagMode=filters.tagMode ?? 'all',folder=filters.folder ?? '';
+    if(!LIBRARY_TAG_MODES.includes(tagMode)) throw new TypeError('Invalid library tag mode');
+    if(typeof folder!=='string' || folder.length>1024) throw new TypeError('Invalid library folder');
+    if(tagMode!=='all') query.set('tag_mode',tagMode);
+    if(folder) query.set('folder',folder);
     query.set('sort',sort);return query;
 }
+/** The Library's tag match values (#444); the first is the default, sent as no parameter. */
+export const LIBRARY_TAG_MODES=Object.freeze(['all','any']);
 // `variant_total` is the filtered parents' active negative variants (the concept caption's "M negative variants").
-function validatePage(page,cursor) {
+function validatePage(page,cursor,query) {
+    // A tag match or folder the server did not echo was not applied (an older server): never show the whole shelf as filtered.
+    if(query?.has('tag_mode') && page?.tag_mode!==query.get('tag_mode')) throw new TypeError('Unconfirmed library tag mode');
+    if(query?.has('folder') && page?.folder!==query.get('folder')) throw new TypeError('Unconfirmed library folder');
     if(!page || !Array.isArray(page.items) || page.items.some(item=>!parent(item)) || !Number.isSafeInteger(page.total) || page.total<0 || !Number.isSafeInteger(page.variant_total) || page.variant_total<0 || typeof page.has_more!=='boolean' || !(page.next_cursor===null || (typeof page.next_cursor==='string' && page.next_cursor.length)) || page.has_more!==(page.next_cursor!==null) || (page.has_more && cursor===page.next_cursor)) throw new TypeError('Invalid library page');
 }
 export function createLibraryStream({api,onChange=()=>{},restore}) {
@@ -37,7 +48,7 @@ export function createLibraryStream({api,onChange=()=>{},restore}) {
         try {
             const page=await api.get(`/prompt_manager/library?${params}`,{signal:current.signal});
             if(disposed || current!==request) return 0;
-            validatePage(page,cursor);const incoming=[];const added=new Set();
+            validatePage(page,cursor,query);const incoming=[];const added=new Set();
             for(const item of page.items) if(!seen.has(item.id) && !added.has(item.id)) {added.add(item.id);incoming.push(Object.freeze({...item}));}
             for(const value of added) seen.add(value);
             request=null;emit({items:incoming.length?Object.freeze([...state.items,...incoming]):state.items,total:page.total,variantTotal:page.variant_total,cursor:page.next_cursor,hasMore:page.has_more,loading:false,error:null});return incoming.length;
diff --git a/web/js/workspace/library.mjs b/web/js/workspace/library.mjs
index 1a263ce5..e687816c 100644
--- a/web/js/workspace/library.mjs
+++ b/web/js/workspace/library.mjs
@@ -2,7 +2,7 @@ import {createScope,createButton} from '../shared/toolkit/core.js';
 import {createPromptSender} from './prompt-sender.mjs';
 import {mountPromptBlocks} from './prompt-inspector.mjs';
 import {mountImages} from './images.mjs';
-import {createLibraryStream,createLibraryDetail,libraryPromptRoles} from './library-state.mjs';
+import {createLibraryStream,createLibraryDetail,libraryPromptRoles,LIBRARY_TAG_MODES} from './library-state.mjs';
 import {promptRoles} from './prompt-blocks.mjs';
 import {createLibraryEditor,showWorkspaceToast} from './library-editor.mjs';
 import {createLibraryEditorController} from './library-editor-state.mjs';
@@ -30,6 +30,16 @@ const metadataDrafts=new Map();
 const archivedVisible=new Map();
 // The concept's three sorts first, then the Library's appended Oldest first (D14).
 const LIBRARY_SORTS=Object.freeze([['newest','Recently added'],['name','Name A–Z'],['rating','Highest rated'],['oldest','Oldest first']]);
+// Refine › Tag match (#444 D150), in LIBRARY_TAG_MODES order.
+const TAG_MATCH_OPTIONS=Object.freeze([['all','All of these tags'],['any','Any of these tags']]);
+/**
+ * Refine › Folder options (#444 D150): the concept's "All output folders" first, then each folder indented by its depth
+ * with its last segment as the label (the legacy admin select), and the current folder kept even when it is not listed.
+ */
+export function libraryFolderOptions(folders,current='') {
+    const listed=[...folders];if(current && !listed.includes(current)) listed.push(current);
+    return [['','All output folders'],...listed.map(folder=>{const parts=folder.split('/');return [folder,`${'\u00a0\u00a0'.repeat(parts.length-1)}${parts.at(-1)}`];})];
+}
 const CATEGORIES_FAILED='Categories could not be loaded. Open the Prompt library again to retry.';
 const ARCHIVED_MESSAGE='Archived. Find it under Show archived in Negative variants.';
 function el(tag,text,className) {
@@ -80,9 +90,9 @@ export function onLibraryWrite(listener) {
  * with the existing Library filters, and the heading takes focus as after a save.
  */
 export function browseLibrary(filters) {
-    const {text='',category='',tags=[],sort='newest'}=filters || {};
-    if(typeof text!=='string' || typeof category!=='string' || !Array.isArray(tags) || tags.some(tag=>typeof tag!=='string') || typeof sort!=='string') throw new TypeError('Invalid Library filters');
-    shelfVisit={filters:{text,category,tags:[...tags],sort},anchor:null};
+    const {text='',category='',tags=[],sort='newest',tagMode='all',folder=''}=filters || {};
+    if(typeof text!=='string' || typeof category!=='string' || !Array.isArray(tags) || tags.some(tag=>typeof tag!=='string') || typeof sort!=='string' || !LIBRARY_TAG_MODES.includes(tagMode) || typeof folder!=='string') throw new TypeError('Invalid Library filters');
+    shelfVisit={filters:{text,category,tags:[...tags],sort,tagMode,folder},anchor:null};
     focusHeadingOnMount=true;window.location.hash='#/library';
 }
 /** Remember the selection a reconciled save names, so the destination history opens on it once. */
@@ -155,13 +165,14 @@ export function mountLibrary(main,api,parentScope,{positiveId,savedState=null,on
         const visit=saved?null:shelfVisit, mountedGeneration=writeGeneration;
         // An invalidated visit keeps only filters and anchor: the stream restarts and heights are measured again.
         const restorable=visit?.state?visit:null;
-        const filters={text:'',category:'',tags:[],sort:'newest',...visit?.filters,...saved};
+        const filters={text:'',category:'',tags:[],sort:'newest',tagMode:'all',folder:'',...visit?.filters,...saved};
         const section=el('section',undefined,'library-shelf');section.setAttribute('aria-label','Prompt library');
         // The shared concept toolbar (app.js toolbar(), a347–360): Tags live in "Refine this view" (D14), no Refresh (D15).
         // Its own scope, disposed after the visit is saved: removing it first would shorten the page and clamp scrollY.
         const toolbarScope=createScope();
-        // D44: Filters reads "Filters · 1" while a Tags filter (from Refine or a Browse) narrows the shelf.
-        const refinements=()=>filters.tags.length?1:0;
+        // D44: Filters reads "Filters · N" while Refine filters narrow the shelf: Tags, a Folder and a Tag match other
+        // than All (#444 D150) each count once.
+        const refinements=()=>(filters.tags.length?1:0)+(filters.folder?1:0)+(filters.tagMode!=='all'?1:0);
         const toolbar=mountToolbar(section,{scope:toolbarScope,categories:filters.category?[filters.category]:[],sorts:LIBRARY_SORTS,
             value:{q:filters.text,category:filters.category,sort:filters.sort},activeFilters:refinements(),onChange:applyToolbar,onFilters:openFilters,
             onSaveView:trigger=>{const value=toolbar.value();onSaveView(trigger,libraryViewState({...filters,text:value.q.trim(),category:value.category,sort:value.sort}));}});
@@ -203,7 +214,7 @@ export function mountLibrary(main,api,parentScope,{positiveId,savedState=null,on
         // Nothing follows the grid in the concept; the legacy Library stays one click away on Overview (spec §5).
         continuation.append(message,retry,more);section.append(optionsStatus,exportStatus,caption,grid,continuation);main.append(section);
         const cards=new Map(), rowNodes=new Map(), spacers=new Map(), heights=new Map(), pendingMeasurements=new Map();
-        let state,frame=0,loadFrame=0,observer,optionsRequest,focusOverride=-1;
+        let state,frame=0,loadFrame=0,observer,optionsRequest,folderRequest,focusOverride=-1;
         const columns=()=>window.innerWidth>=1700?3:window.innerWidth<=700?1:2;
         const readInlineSize=()=>Math.round(grid.getBoundingClientRect().width*64)/64;
         let inlineSize=readInlineSize(), columnCount=columns(), layout={rows:[],height:0}, dirty=true, items, indexesById=new Map();
@@ -402,15 +413,25 @@ export function mountLibrary(main,api,parentScope,{positiveId,savedState=null,on
             if(Object.entries(next).every(([key,item])=>filters[key]===item)) return;
             Object.assign(filters,next);reset();
         }
-        /** "Refine this view" with the Library's one extra filter, Tags (D14); Clear also clears the toolbar category. */
+        /**
+         * "Refine this view" with the Library's filters: the concept's Folder (#444 D150, its options read when the dialog
+         * opens), Tags (D14) and Tag match (D150); Clear also clears the toolbar category.
+         */
         function openFilters(trigger) {
-            openRefineDialog({scope,trigger,fields:[{key:'tags'}],values:{tags:filters.tags.join(', ')},onApply:applyRefinement,
-                onClear:cleared=>{toolbar.setValue({category:cleared.category});applyRefinement(cleared);}});
+            const refine=openRefineDialog({scope,trigger,fields:[{key:'folder',options:libraryFolderOptions([],filters.folder)},{key:'tags'},
+                {key:'tagMode',options:TAG_MATCH_OPTIONS}],values:{folder:filters.folder,tags:filters.tags.join(', '),tagMode:filters.tagMode},
+                onApply:applyRefinement,onClear:cleared=>{toolbar.setValue({category:cleared.category});applyRefinement(cleared);}});
+            folderRequest?.abort();const request=folderRequest=new AbortController();
+            // A failed read leaves "All output folders" and the current folder; nothing else depends on it.
+            api.get('/prompt_manager/library/options?include=folders',{signal:request.signal}).then(data=>{
+                if(scope.signal.aborted || folderRequest!==request || !Array.isArray(data?.folders) || data.folders.some(folder=>typeof folder!=='string')) return;
+                refine.setOptions('folder',libraryFolderOptions(data.folders,filters.folder));
+            },()=>{});
         }
-        function applyRefinement({tags,category=filters.category}) {
+        function applyRefinement({tags,tagMode='all',folder='',category=filters.category}) {
             const next=[...new Set(tags.split(',').map(tag=>tag.trim()).filter(Boolean))];
-            if(category===filters.category && next.length===filters.tags.length && next.every((tag,index)=>tag===filters.tags[index])) return;
-            filters.category=category;filters.tags=next;reset();
+            if(category===filters.category && tagMode===filters.tagMode && folder===filters.folder && next.length===filters.tags.length && next.every((tag,index)=>tag===filters.tags[index])) return;
+            filters.category=category;filters.tags=next;filters.tagMode=tagMode;filters.folder=folder;reset();
         }
         scope.listen(more,'click',()=>stream.loadMore());
         // Retry also re-reads a category list that failed (D15: Refresh is gone).
@@ -423,7 +444,7 @@ export function mountLibrary(main,api,parentScope,{positiveId,savedState=null,on
             // A write while mounted makes this stream stale: keep only what still means something.
             // A saved view is not the plain shelf, so it never replaces the Library return state (#249 M2, as Favorites).
             if(!saved) shelfVisit=mountedGeneration!==writeGeneration?{filters:savedFilters,anchor:savedAnchor}:state?{filters:savedFilters,state,scrollY:window.scrollY,layout:{inlineSize,columns:columnCount,heights:[...heights],anchor:savedAnchor}}:null;
-            toolbarScope.dispose();stream.dispose();optionsRequest?.abort();observer?.disconnect();measurementObserver?.disconnect();cancelAnimationFrame(frame);cancelAnimationFrame(loadFrame);for(const card of cards.values())removeCard(card);cards.clear();});
+            toolbarScope.dispose();stream.dispose();optionsRequest?.abort();folderRequest?.abort();observer?.disconnect();measurementObserver?.disconnect();cancelAnimationFrame(frame);cancelAnimationFrame(loadFrame);for(const card of cards.values())removeCard(card);cards.clear();});
         loadCategories();if(restorable) {render(stream.state);if(restorable.state.loading || restorable.state.error)stream.loadMore();} else reset();
     }
 
diff --git a/web/js/workspace/saved-views.mjs b/web/js/workspace/saved-views.mjs
index 7f027860..6619a2b3 100644
--- a/web/js/workspace/saved-views.mjs
+++ b/web/js/workspace/saved-views.mjs
@@ -46,6 +46,8 @@ const FIELDS = Object.freeze({
     }),
     library: Object.freeze({
         q: text(500), category: text(100), sort: choice(['newest', 'oldest', 'name', 'rating'], 'newest'), tags,
+        // #444: how the Tags match and the output folder ('/'-joined, below a root).
+        tag_mode: choice(['all', 'any'], 'all'), folder: text(1024),
     }),
 });
 
@@ -112,10 +114,11 @@ export function imagesViewState(filters) {
 /** Library shelf filters (library.mjs `filters`) from a saved state, and the state of the current filters. */
 export function libraryFilters(state) {
     const view = normalizeViewState('library', state);
-    return { text: view.q, category: view.category, sort: view.sort, tags: view.tags };
+    return { text: view.q, category: view.category, sort: view.sort, tags: view.tags, tagMode: view.tag_mode, folder: view.folder };
 }
 export function libraryViewState(filters) {
-    return normalizeViewState('library', { q: filters.text, category: filters.category, sort: filters.sort, tags: filters.tags });
+    return normalizeViewState('library', { q: filters.text, category: filters.category, sort: filters.sort, tags: filters.tags,
+        tag_mode: filters.tagMode ?? 'all', folder: filters.folder ?? '' });
 }
 
 /**
diff --git a/web/js/workspace/workspace-dialogs.mjs b/web/js/workspace/workspace-dialogs.mjs
index fff32920..83538cac 100644
--- a/web/js/workspace/workspace-dialogs.mjs
+++ b/web/js/workspace/workspace-dialogs.mjs
@@ -24,7 +24,8 @@
 import { createButton, createSwitch } from '../shared/toolkit/core.js';
 import { noun } from './plural.mjs';
 
-const FIELD_LABELS = Object.freeze({ source: 'Source', folder: 'Folder', media: 'Media', tags: 'Tags' });
+// `tagMode` (#444, D150): the Library's Tag match select after Tags.
+const FIELD_LABELS = Object.freeze({ source: 'Source', folder: 'Folder', media: 'Media', tags: 'Tags', tagMode: 'Tag match' });
 const FIELD_ORDER = Object.keys(FIELD_LABELS);
 
 let shell = null;
@@ -171,7 +172,7 @@ export function openRefineDialog({ scope, fields, values = {}, onApply, onClear,
     requireScope(scope);
     requireCallbacks({ onApply, onClear });
     if (!Array.isArray(fields) || fields.some(item => !FIELD_ORDER.includes(item?.key))) {
-        throw new TypeError('Refine fields are source, folder, media and tags');
+        throw new TypeError('Refine fields are source, folder, media, tags and tagMode');
     }
     const controls = FIELD_ORDER.flatMap(key => {
         const item = fields.find(candidate => candidate.key === key);