diff --git a/lib/content/conformance.sh b/lib/content/conformance.sh
index f529800a..3549ad04 100755
--- a/lib/content/conformance.sh
+++ b/lib/content/conformance.sh
@@ -15,7 +15,7 @@ if [ ! -x "$SX_SERVER" ]; then
   fi
 fi
 
-SUITES=(block doc render api markdown validate store snapshot crdt crdt-store sync md-import fed)
+SUITES=(block doc render api meta markdown validate store snapshot crdt crdt-store sync md-import fed)
 
 OUT_JSON="lib/content/scoreboard.json"
 OUT_MD="lib/content/scoreboard.md"
@@ -42,6 +42,7 @@ run_suite() {
 (load "lib/content/doc.sx")
 (load "lib/content/render.sx")
 (load "lib/content/api.sx")
+(load "lib/content/meta.sx")
 (load "lib/content/markdown.sx")
 (load "lib/content/validate.sx")
 (load "lib/content/store.sx")
diff --git a/lib/content/doc.sx b/lib/content/doc.sx
index 90e9bede..5675d35b 100644
--- a/lib/content/doc.sx
+++ b/lib/content/doc.sx
@@ -5,6 +5,9 @@
 ;; and returns a NEW document — the input is never mutated, so any version is the
 ;; head of an op stream (replay-friendly for persist + CRDT merge).
 ;;
+;; CtDoc also carries optional metadata (title/slug/tags) — see meta.sx for the
+;; ergonomic API; they default nil and do not affect block operations.
+;;
 ;; Op shapes (data, not objects — they are the persist event payload):
 ;;   {:op "insert" :block <blk> :after <id|nil>}   ; after nil = prepend
 ;;   {:op "update" :id <id> :field <name> :value <v>}
@@ -16,10 +19,16 @@
   (fn
     ()
     (begin
-      (st-class-define! "CtDoc" "Object" (list "id" "blocks"))
+      (st-class-define!
+        "CtDoc"
+        "Object"
+        (list "id" "blocks" "title" "slug" "tags"))
       (ct-def-method! "CtDoc" "id" "id ^ id")
       (ct-def-method! "CtDoc" "blocks" "blocks ^ blocks")
       (ct-def-method! "CtDoc" "type" "type ^ #document")
+      (ct-def-method! "CtDoc" "title" "title ^ title")
+      (ct-def-method! "CtDoc" "slug" "slug ^ slug")
+      (ct-def-method! "CtDoc" "tags" "tags ^ tags")
       true)))
 
 ;; ── construction ──
diff --git a/lib/content/meta.sx b/lib/content/meta.sx
new file mode 100644
index 00000000..a38afe33
--- /dev/null
+++ b/lib/content/meta.sx
@@ -0,0 +1,53 @@
+;; content-on-sx — document metadata (title / slug / tags).
+;;
+;; CtDoc carries optional metadata alongside its blocks (ivars declared in
+;; doc.sx). Reads go through message dispatch; setters are copy-on-write
+;; (functional st-iv-set!), consistent with the immutable document model.
+;;
+;; Requires (loaded by harness): block.sx, doc.sx.
+
+;; ── reads ──
+(define doc-title (fn (doc) (st-send doc "title" (list))))
+(define doc-slug (fn (doc) (st-send doc "slug" (list))))
+(define
+  doc-tags
+  (fn
+    (doc)
+    (let ((t (st-send doc "tags" (list)))) (if (= t nil) (list) t))))
+
+(define doc-meta (fn (doc) {:slug (doc-slug doc) :id (doc-id doc) :title (doc-title doc) :tags (doc-tags doc)}))
+
+;; ── copy-on-write setters ──
+(define doc-with-title (fn (doc title) (st-iv-set! doc "title" title)))
+(define doc-with-slug (fn (doc slug) (st-iv-set! doc "slug" slug)))
+(define doc-with-tags (fn (doc tags) (st-iv-set! doc "tags" tags)))
+
+(define
+  doc-add-tag
+  (fn (doc tag) (doc-with-tags doc (append (doc-tags doc) (list tag)))))
+
+;; set several at once: meta is a dict with optional :title :slug :tags
+(define
+  doc-with-meta
+  (fn
+    (doc meta)
+    (let
+      ((d1 (if (has-key? meta :title) (doc-with-title doc (get meta :title)) doc)))
+      (let
+        ((d2 (if (has-key? meta :slug) (doc-with-slug d1 (get meta :slug)) d1)))
+        (if (has-key? meta :tags) (doc-with-tags d2 (get meta :tags)) d2)))))
+
+;; constructor with metadata
+(define
+  doc-new-meta
+  (fn (id blocks meta) (doc-with-meta (doc-new id blocks) meta)))
+
+;; ── content/* facade aliases ──
+(define content/title doc-title)
+(define content/slug doc-slug)
+(define content/tags doc-tags)
+(define content/meta doc-meta)
+(define content/with-title doc-with-title)
+(define content/with-slug doc-with-slug)
+(define content/with-tags doc-with-tags)
+(define content/with-meta doc-with-meta)
diff --git a/lib/content/scoreboard.json b/lib/content/scoreboard.json
index c1af9deb..1624aad3 100644
--- a/lib/content/scoreboard.json
+++ b/lib/content/scoreboard.json
@@ -4,6 +4,7 @@
     "doc": {"pass": 40, "fail": 0},
     "render": {"pass": 42, "fail": 0},
     "api": {"pass": 26, "fail": 0},
+    "meta": {"pass": 27, "fail": 0},
     "markdown": {"pass": 20, "fail": 0},
     "validate": {"pass": 17, "fail": 0},
     "store": {"pass": 29, "fail": 0},
@@ -14,7 +15,7 @@
     "md-import": {"pass": 24, "fail": 0},
     "fed": {"pass": 20, "fail": 0}
   },
-  "total_pass": 338,
+  "total_pass": 365,
   "total_fail": 0,
-  "total": 338
+  "total": 365
 }
diff --git a/lib/content/scoreboard.md b/lib/content/scoreboard.md
index e87aa5e0..3d202d4f 100644
--- a/lib/content/scoreboard.md
+++ b/lib/content/scoreboard.md
@@ -8,6 +8,7 @@ _Generated by `lib/content/conformance.sh`_
 | doc | 40 | 0 | 40 |
 | render | 42 | 0 | 42 |
 | api | 26 | 0 | 26 |
+| meta | 27 | 0 | 27 |
 | markdown | 20 | 0 | 20 |
 | validate | 17 | 0 | 17 |
 | store | 29 | 0 | 29 |
@@ -17,4 +18,4 @@ _Generated by `lib/content/conformance.sh`_
 | sync | 14 | 0 | 14 |
 | md-import | 24 | 0 | 24 |
 | fed | 20 | 0 | 20 |
-| **Total** | **338** | **0** | **338** |
+| **Total** | **365** | **0** | **365** |
diff --git a/lib/content/sync.sx b/lib/content/sync.sx
index 45b6ac60..06dd8b0f 100644
--- a/lib/content/sync.sx
+++ b/lib/content/sync.sx
@@ -64,8 +64,11 @@
   ghost-import
   (fn
     (post doc-id)
-    (doc-new doc-id (map ghost-section->block (get post :sections)))))
+    (st-iv-set!
+      (doc-new doc-id (map ghost-section->block (get post :sections)))
+      "title"
+      (get post :title))))
 
-(define ghost-export (fn (doc) {:sections (map block->ghost-section (doc-blocks doc))}))
+(define ghost-export (fn (doc) {:sections (map block->ghost-section (doc-blocks doc)) :title (st-send doc "title" (list))}))
 
 (define ghost-adapter {:export ghost-export :import ghost-import})
diff --git a/lib/content/tests/meta.sx b/lib/content/tests/meta.sx
new file mode 100644
index 00000000..f104a2f3
--- /dev/null
+++ b/lib/content/tests/meta.sx
@@ -0,0 +1,79 @@
+;; Extension — document metadata (title/slug/tags) + Ghost title plumbing.
+
+(st-bootstrap-classes!)
+(content/bootstrap!)
+
+(define d (doc-empty "post"))
+
+;; ── defaults ──
+(content-test "default title nil" (doc-title d) nil)
+(content-test "default slug nil" (doc-slug d) nil)
+(content-test "default tags empty" (doc-tags d) (list))
+
+;; ── copy-on-write setters ──
+(define d2 (doc-with-title d "Hello World"))
+(content-test "with-title" (doc-title d2) "Hello World")
+(content-test "with-title immutable" (doc-title d) nil)
+(content-test "with-title keeps id" (doc-id d2) "post")
+
+(define d3 (doc-with-slug (doc-with-title d "T") "my-slug"))
+(content-test "with-slug" (doc-slug d3) "my-slug")
+(content-test "title preserved with slug" (doc-title d3) "T")
+
+(define d4 (doc-with-tags d (list "a" "b")))
+(content-test "with-tags" (doc-tags d4) (list "a" "b"))
+(content-test "add-tag" (doc-tags (doc-add-tag d4 "c")) (list "a" "b" "c"))
+(content-test
+  "add-tag from empty"
+  (doc-tags (doc-add-tag d "x"))
+  (list "x"))
+
+;; ── batch + dict ──
+(define d5 (doc-with-meta d {:slug "s" :title "T" :tags (list "t1")}))
+(content-test "with-meta title" (doc-title d5) "T")
+(content-test "with-meta slug" (doc-slug d5) "s")
+(content-test "with-meta tags" (doc-tags d5) (list "t1"))
+(content-test
+  "with-meta partial leaves title"
+  (doc-title (doc-with-meta d {:slug "only"}))
+  nil)
+(content-test "doc-meta dict" (doc-meta d5) {:slug "s" :id "post" :title "T" :tags (list "t1")})
+
+;; ── constructor with metadata ──
+(define d6 (doc-new-meta "p2" (list (mk-text "x" "hi")) {:title "Post 2"}))
+(content-test "new-meta title" (doc-title d6) "Post 2")
+(content-test "new-meta blocks" (doc-ids d6) (list "x"))
+
+;; ── facade aliases ──
+(content-test "content/title" (content/title d5) "T")
+(content-test
+  "content/with-title"
+  (content/title (content/with-title d "Z"))
+  "Z")
+(content-test "content/meta" (content/meta d5) (doc-meta d5))
+
+;; ── metadata coexists with block ops ──
+(define
+  d7
+  (doc-append
+    (doc-with-title (doc-empty "x") "Titled")
+    (mk-text "p" "body")))
+(content-test "meta + blocks coexist" (doc-ids d7) (list "p"))
+(content-test "meta survives append" (doc-title d7) "Titled")
+(content-test
+  "meta survives edit"
+  (doc-title (doc-update d7 "p" "text" "changed"))
+  "Titled")
+
+;; ── Ghost adapter now carries title ──
+(define post {:sections (list {:id "h" :text "Hi" :kind "heading" :level 1}) :title "My Post"})
+(define gd (content/import ghost-adapter post "post"))
+(content-test "ghost import title" (doc-title gd) "My Post")
+(content-test
+  "ghost export title"
+  (get (content/export ghost-adapter gd) :title)
+  "My Post")
+(content-test
+  "ghost title round-trip"
+  (doc-title (content/round-trip ghost-adapter gd))
+  "My Post")
diff --git a/plans/content-on-sx.md b/plans/content-on-sx.md
index 55ae2eac..7833fc6d 100644
--- a/plans/content-on-sx.md
+++ b/plans/content-on-sx.md
@@ -19,7 +19,7 @@ injected adapter, not core.
 
 ## Status (rolling)
 
-`bash lib/content/conformance.sh` → **338/338** (Phases 1–4 COMPLETE + extensions: HTML/SX escaping, Markdown render+import, durable CRDT replication, validation, snapshot cache)
+`bash lib/content/conformance.sh` → **365/365** (Phases 1–4 COMPLETE + extensions: HTML/SX escaping, Markdown render+import, durable CRDT replication, validation, snapshot cache, doc metadata)
 
 ## Ground rules
 
@@ -83,9 +83,16 @@ lib/content/api.sx ── (content/edit) (content/render) (content/history) ─
 - [x] document validation (`validate.sx`: ids, per-type fields, duplicate ids)
 - [x] Markdown import adapter (`md-import.sx`: text → blocks, round-trips export)
 - [x] snapshot cache over replay (`snapshot.sx`: cache-not-primary, transparent)
+- [x] document metadata (`meta.sx`: title/slug/tags + Ghost title plumbing)
 
 ## Progress log
 
+- 2026-06-07 — Extension: document metadata (`meta.sx`). CtDoc gained optional
+  title/slug/tags ivars (declared in doc.sx, default nil/empty, no effect on
+  block ops). Reads via message dispatch; copy-on-write setters
+  (`doc-with-title/slug/tags`, `doc-add-tag`, `doc-with-meta`, `doc-new-meta`)
+  and `content/*` aliases; `doc-meta` returns the metadata dict. Ghost adapter
+  now carries `:title` through import/export/round-trip. 27 tests; suite 365/365.
 - 2026-06-07 — Extension: snapshot cache over op-log replay (`snapshot.sx`).
   Snapshots are a cache, never primary state — the log stays the source of truth.
   `content/snapshot!` stores a materialised head at a seq in the persist KV;