diff --git a/replica/messages/architecture.md b/replica/messages/architecture.md
new file mode 100644
index 0000000..4449ec3
--- /dev/null
+++ b/replica/messages/architecture.md
@@ -0,0 +1,18 @@
+# Architecture: Messages (Android, ohne Google)
+
+Same conventions as the others; **no network permission** (SMS goes through the radio, not the internet).
+
+| Schicht | Wahl | warum |
+| --- | --- | --- |
+| UI | Compose, M3 Expressive, dynamic colour | same as the others |
+| Rolle | `RoleManager.ROLE_SMS` | only the default SMS app may write the SMS provider and receives SMS_DELIVER |
+| Empfangen | `SMS_DELIVER` receiver (BROADCAST_SMS), joins multipart PDUs, inserts into `Telephony.Sms.Inbox` | default app duty |
+| MMS-Pflicht | `WAP_PUSH_DELIVER` receiver (accepted, stored later with MMS support) | required for the role |
+| Senden | `SmsManager.divideMessage` + `sendMultipartTextMessage` with sent/delivered PendingIntents; row in outbox → sent/failed | status updates in the provider |
+| Antwort ohne UI | `RESPOND_VIA_MESSAGE` service (SEND_RESPOND_VIA_MESSAGE) | phone app "decline with message"; required for the role |
+| Daten | system provider via ContentResolver + ContentObserver | no copies |
+| Kontakte | PhoneLookup, same helper as Telefon | |
+
+Data: no own schema (DataStore for settings).
+Bites: multipart and encoding, dual SIM (`SubscriptionManager`), status callbacks after process death (receiver updates by message id), notification grouping per thread, short codes and alphanumeric senders (no reply possible).
+Build order: role + receive + list → conversation + send + status → notifications with reply → new chat, search, archive, delete → MMS.
diff --git a/replica/messages/design/Tokens.kt b/replica/messages/design/Tokens.kt
new file mode 100644
index 0000000..f957654
--- /dev/null
+++ b/replica/messages/design/Tokens.kt
@@ -0,0 +1,62 @@
+// Generated from tokens.json by gen_theme.py. Do not edit by hand.
+package app.messages.ui.theme
+
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+
+object WColor {
+    val bg = Color(0xFFF8F9FF)
+    val row = Color(0xFFFFFFFF)
+    val text = Color(0xFF191C20)
+    val textMuted = Color(0xFF44474E)
+    val bubbleIn = Color(0xFFE8EAF1)
+    val onBubbleIn = Color(0xFF191C20)
+    val bubbleOut = Color(0xFF2B5EA7)
+    val onBubbleOut = Color(0xFFFFFFFF)
+    val unread = Color(0xFF2B5EA7)
+    val error = Color(0xFFBA1A1A)
+    val fab = Color(0xFFD6E3FF)
+    val onFab = Color(0xFF001B3E)
+    val composer = Color(0xFFECEEF4)
+    val onComposer = Color(0xFF191C20)
+    val darkBg = Color(0xFF111318)
+    val darkRow = Color(0xFF1D2024)
+    val darkText = Color(0xFFE2E2E9)
+    val darkTextMuted = Color(0xFFC4C6D0)
+    val darkBubbleIn = Color(0xFF2B2F36)
+    val darkOnBubbleIn = Color(0xFFE2E2E9)
+    val darkBubbleOut = Color(0xFFA8C7FA)
+    val darkOnBubbleOut = Color(0xFF062E6F)
+    val darkUnread = Color(0xFFA8C7FA)
+    val darkError = Color(0xFFFFB4AB)
+    val darkFab = Color(0xFF284777)
+    val darkOnFab = Color(0xFFD6E3FF)
+    val darkComposer = Color(0xFF2B2F36)
+    val darkOnComposer = Color(0xFFE2E2E9)
+}
+
+object WType {
+    val label = TextStyle(fontSize = 12.sp, lineHeight = 16.sp, fontWeight = FontWeight.W500)
+    val bodySm = TextStyle(fontSize = 14.sp, lineHeight = 20.sp, fontWeight = FontWeight.W400)
+    val body = TextStyle(fontSize = 16.sp, lineHeight = 22.sp, fontWeight = FontWeight.W400)
+    val title = TextStyle(fontSize = 22.sp, lineHeight = 28.sp, fontWeight = FontWeight.W400)
+}
+
+object WSpace {
+    val s0 = 0.dp
+    val s2 = 2.dp
+    val s4 = 4.dp
+    val s8 = 8.dp
+    val s12 = 12.dp
+    val s16 = 16.dp
+    val s24 = 24.dp
+}
+
+object WRadius {
+    val bubble = 20.dp
+    val bubbleTight = 6.dp
+    val pill = 999.dp
+}
diff --git a/replica/messages/design/gen_theme.py b/replica/messages/design/gen_theme.py
new file mode 100644
index 0000000..9ac7398
--- /dev/null
+++ b/replica/messages/design/gen_theme.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+"""tokens.json -> Tokens.kt (Compose). Re-run after every token change."""
+import json, re, sys, pathlib
+src = pathlib.Path(sys.argv[1] if len(sys.argv) > 1 else "tokens.json")
+out = pathlib.Path(sys.argv[2] if len(sys.argv) > 2 else src.with_name("Tokens.kt"))
+t = json.loads(src.read_text())
+camel = lambda s: re.sub(r"-(\w)", lambda m: m.group(1).upper(), s)
+L = ["// Generated from tokens.json by gen_theme.py. Do not edit by hand.",
+     "package app.messages.ui.theme", "",
+     "import androidx.compose.ui.graphics.Color",
+     "import androidx.compose.ui.text.TextStyle",
+     "import androidx.compose.ui.text.font.FontWeight",
+     "import androidx.compose.ui.unit.dp",
+     "import androidx.compose.ui.unit.sp", "",
+     "object WColor {"]
+L += [f"    val {camel(k)} = Color(0xFF{v.lstrip('#').upper()})" for k, v in t["color"].items()]
+L += ["}", "", "object WType {"]
+for k, v in t["type"].items():
+    L.append(f"    val {camel(k)} = TextStyle(fontSize = {v['size']}.sp, lineHeight = {v['line']}.sp, fontWeight = FontWeight.W{v['weight']})")
+L += ["}", "", "object WSpace {"]
+L += [f"    val s{v} = {v}.dp" for v in t["space"]]
+L += ["}", "", "object WRadius {"]
+L += [f"    val {camel(k)} = {v}.dp" for k, v in t["radius"].items()]
+L += ["}", ""]
+out.write_text("\n".join(L))
+print("wrote", out)
diff --git a/replica/messages/design/tokens.json b/replica/messages/design/tokens.json
new file mode 100644
index 0000000..daf3319
--- /dev/null
+++ b/replica/messages/design/tokens.json
@@ -0,0 +1,16 @@
+{
+  "_about": "Messages fallback palette; dynamic colour on Android 12+.",
+  "color": {
+    "bg": "#f8f9ff", "row": "#ffffff", "text": "#191c20", "text-muted": "#44474e",
+    "bubble-in": "#e8eaf1", "on-bubble-in": "#191c20", "bubble-out": "#2b5ea7", "on-bubble-out": "#ffffff",
+    "unread": "#2b5ea7", "error": "#ba1a1a", "fab": "#d6e3ff", "on-fab": "#001b3e", "composer": "#eceef4", "on-composer": "#191c20",
+    "dark-bg": "#111318", "dark-row": "#1d2024", "dark-text": "#e2e2e9", "dark-text-muted": "#c4c6d0",
+    "dark-bubble-in": "#2b2f36", "dark-on-bubble-in": "#e2e2e9", "dark-bubble-out": "#a8c7fa", "dark-on-bubble-out": "#062e6f",
+    "dark-unread": "#a8c7fa", "dark-error": "#ffb4ab", "dark-fab": "#284777", "dark-on-fab": "#d6e3ff", "dark-composer": "#2b2f36", "dark-on-composer": "#e2e2e9"
+  },
+  "pairs": [["text","bg"],["text","row"],["text-muted","row"],["on-bubble-in","bubble-in"],["on-bubble-out","bubble-out"],["unread","row"],["error","bg"],["on-fab","fab"],["on-composer","composer"],
+    ["dark-text","dark-bg"],["dark-text","dark-row"],["dark-text-muted","dark-row"],["dark-on-bubble-in","dark-bubble-in"],["dark-on-bubble-out","dark-bubble-out"],["dark-unread","dark-row"],["dark-error","dark-bg"],["dark-on-fab","dark-fab"],["dark-on-composer","dark-composer"]],
+  "type": {"label": {"size": 12, "line": 16, "weight": 500}, "body-sm": {"size": 14, "line": 20, "weight": 400}, "body": {"size": 16, "line": 22, "weight": 400}, "title": {"size": 22, "line": 28, "weight": 400}},
+  "space": [0, 2, 4, 8, 12, 16, 24],
+  "radius": {"bubble": 20, "bubble-tight": 6, "pill": 999}
+}
diff --git a/replica/messages/features.csv b/replica/messages/features.csv
new file mode 100644
index 0000000..b99eaf5
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+++ b/replica/messages/features.csv
@@ -0,0 +1,25 @@
+feature,area,priority,original,clone,notes
+Become the default SMS app (role),core,must,yes,no,
+Receive SMS and store it in the system provider,core,must,yes,no,
+Send SMS incl. long multipart messages,core,must,yes,no,
+Sent and delivered status; failed with retry,core,must,yes,no,
+Conversation list with unread state,list,must,yes,no,
+Contact names and avatars,list,must,yes,no,
+Conversation bubbles with day separators,chat,must,yes,no,
+Composer with send button,chat,must,yes,no,
+Notification with direct reply and mark as read,notifications,must,yes,no,
+Start a new chat from contacts or a number,compose,must,yes,no,
+Mark as read when opened,core,must,yes,no,
+Delete conversations,list,should,yes,no,
+Archive conversations,list,should,yes,no,
+Search messages,search,should,yes,no,
+Copy message text and links clickable,chat,should,yes,no,
+Call from the conversation,chat,should,yes,no,
+Quick reply from the phone app (respond via message),core,must,yes,no,needed for the role
+Dual SIM choice,core,could,yes,no,
+Dynamic colour and dark mode,design,must,yes,no,
+Delivery reports setting,settings,could,yes,no,
+MMS pictures and group MMS,mms,should,yes,no,later
+RCS chat features,rcs,could,yes,skip,Google/carrier backend
+Spam protection and Gemini features,other,could,yes,skip,Google services
+Messages for web,other,could,yes,skip,Google service
diff --git a/replica/messages/recon.md b/replica/messages/recon.md
new file mode 100644
index 0000000..6df2dc6
--- /dev/null
+++ b/replica/messages/recon.md
@@ -0,0 +1,64 @@
+# Recon map: Google Messages (Android)
+
+Scope: conversation list, conversation with bubbles, compose/new chat, SMS send/receive/delivery, notifications with reply, search, archive/delete, contacts integration
+For: personal use, an SMS app without Google services (project NoGooleApps)
+Date: 2026-10-17
+
+## Sources
+
+| # | source | URL | notes |
+| --- | --- | --- | --- |
+| 1 | screenshots | replica/messages/screens/ref-01..05.png | supplied by user: launcher icon, RCS group chat with reactions, list (store art), list on a phone (older), chat with image. Reference only |
+| 2 | platform docs | https://developer.android.com/reference/android/provider/Telephony | SMS/MMS provider, default SMS app duties |
+| 3 | platform docs | https://developer.android.com/reference/android/app/role/RoleManager#ROLE_SMS | default SMS app role requirements |
+
+## Core loop
+
+See new texts at a glance and answer in two taps, from the list or straight from the notification.
+
+## Screens
+
+| ID | screen | how | purpose | components | states |
+| --- | --- | --- | --- | --- | --- |
+| S01 | Conversations | launch | all threads | top bar (title, search, menu), rows (avatar, name or number, snippet with "Du: ", time, unread bold + dot), FAB "Chat starten" | empty, no role, filled, unread |
+| S02 | Conversation | tap a row | read and reply | top bar (back, avatar, name, call, menu), bubbles (incoming left surface, outgoing right primary), day separators, time + delivery status, composer pill (attach, field, send) | sending, sent, delivered, failed (tap to retry), long text, links |
+| S03 | New chat | FAB | pick a recipient | "An:" field, contact suggestions, type a number | empty, matches |
+| S04 | Search | search icon | find messages | field, results with highlighted match | |
+| S05 | Archived | menu | archived threads | list | empty |
+| S06 | Settings | menu | options | default app, notifications (system), delivery reports, theme | |
+| S07 | Notification | system | read and reply without opening | MessagingStyle with sender, direct reply, mark as read | |
+
+## Flows
+
+```
+F01 Reply to a new text: notification → reply inline → sent   (taps: 2)
+F02 Read and answer in the app: S01 → S02 → type → send
+F03 Start a chat: S01 FAB → S03 pick contact → S02 → send
+F04 Delete / archive a thread: long press in S01 → action
+F05 Become the default SMS app: first start → system dialog
+edge: long messages (multipart), no signal (failed, retry), dual SIM, unknown sender, short codes, delivery report
+```
+
+## Components
+
+Avatar (photo, initial, unknown) · ConversationRow · Bubble (in, out; first/middle/last grouping radius) · DaySeparator · Composer pill · Status line (Wird gesendet, Gesendet, Zugestellt, Fehler) · FAB extended "Chat starten" · Selection top bar.
+
+## Data model
+
+Messages and threads live in the system provider (`Telephony.Sms`, `Telephony.Threads`); as default SMS app we write incoming messages there ourselves.
+
+```
+Thread   (system) thread_id, recipients, snippet, date, read, archived (Telephony.Threads.ARCHIVED)   confidence: high
+Sms      (system) _id, thread_id, address, body, date, type (inbox|sent|outbox|failed|queued), read, status   confidence: high
+Prefs    own: delivery_reports, theme                                                              confidence: high
+```
+
+## Out of scope
+
+- RCS (typing indicators, reactions, high-res media, read receipts over data): Google's RCS backend (Jibe) and carrier deals; not open to other apps.
+- Google account backup, spam protection, Magic Compose/Gemini, "Messages for web": Google services.
+- MMS (pictures, group MMS): technically possible for a default SMS app but needs carrier MMS settings and PDU handling; planned after SMS works.
+
+## Size
+
+Screens 7, flows 5. Hard parts: (1) default-SMS duties (store incoming, mark read, respond-via-message service, sent/delivered intents, multipart), (2) fast thread list with contact names, (3) MMS later. Size: M.
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