diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2112a8..6ad5a22 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -58,6 +58,28 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- **Room Template Library — R1 (vertical slice)** (`room_library.py`, `room_templates/`, two new MCP
+  tools; tool count **28 → 30**). Compose a **new** KNX project from a list of parametrised room
+  templates ("constructor"). The template format is a deliberate public contract (`room_templates/SCHEMA.md`):
+  `schema_version`, a **locale-neutral semantic `slot_id`** (identity never comes from a human name),
+  `labels.{ru,en}` for presentation, **per-slot** `basic`/`comfort` presets (not one monolithic room
+  level — a house can mix comfort climate with basic lighting), and parameters where `area_m2` is an
+  explicit **hint** with provenance, never a normative fact. Six built-in rooms ship: bedroom, children,
+  living, kitchen, bathroom, corridor. Templates describe **functions** (function-first); logic
+  (presence→light) is declared as non-executable `automation_intents` metadata only.
+  A separate resolved IR (its own dataclasses — **not** the public `GARecord`) drives allocation
+  (main = domain, middle = role, sub sequential) with a hard error on sub-address exhaustion (never a
+  silent overflow). Critically, the composer writes a **real `.knxproj` (ZIP of ETS XML) and re-reads it
+  through the standard `load_project`** — the same path used for third-party projects — so generation
+  never touches the classifier and is validated by the real reader. New tools:
+  `validate_room_template(template?, path?)` (schema check) and
+  `compose_rooms(rooms, language="ru", project_name?, output_dir?, dry_run=true)` — outputs an allocation
+  `manifest`, ETS GA **XML/CSV** via the existing generators, and a device **BOM proposal** from the
+  device library. New projects only, dry-run by default; docking into an existing project and exact
+  device selection are R2. The generated house passes all four linters (naming / missing-status / DPT /
+  policy) with **0 errors and 0 warnings**. `tests/test_room_library.py` (golden RU/EN, idempotency,
+  permutation invariance, address-exhaustion error, round-trip 0-error lint, negative-oracle manifest).
+
 - **Explainable aggregate scores** (`advanced.py`, `handover.py`). Every headline percentage now ships
   the numbers behind it instead of a bare figure: Matter readiness, the completeness grade and
   command/status coverage each carry a `math` block with the numerator, denominator, the exact formula
diff --git a/README.md b/README.md
index 848f666..99b59f7 100644
--- a/README.md
+++ b/README.md
@@ -250,7 +250,7 @@ keyring handling, and the recommended workflow).
 
 ---
 
-## MCP tools (28)
+## MCP tools (30)
 
 **Read**
 | Tool | Purpose |
@@ -296,6 +296,12 @@ keyring handling, and the recommended workflow).
 | `project_report(output_path?, name_regex?)` | Markdown report |
 | `workspace_info()` | workspace path + safety guarantees |
 
+**Room Library** (R1 — compose a new project from room templates)
+| Tool | Purpose |
+|------|---------|
+| `validate_room_template(template?, path?)` | validate a room template (built-in slot_id or a custom YAML) against the R1 schema |
+| `compose_rooms(rooms, language="ru", project_name?, output_dir?, dry_run=true)` | build a **new** project from a list of rooms → allocation `manifest`, ETS GA XML/CSV, device `bom` proposal; generated `.knxproj` is re-read by the standard loader and linted (0 errors / 0 warnings). New projects only, dry-run by default. |
+
 ---
 
 ## Typical workflow
@@ -356,7 +362,7 @@ nickol-knx-mcp/
 │   ├── generate_ha.py    # Home Assistant KNX YAML generation
 │   ├── generate_ets.py   # ETS XML + CSV generation
 │   ├── report.py         # Markdown report
-│   └── server.py         # FastMCP server, 28 tools, confined writes
+│   └── server.py         # FastMCP server, 30 tools, confined writes
 ├── tests/test_pipeline.py
 ├── examples/claude_desktop_config.json
 ├── skills/
diff --git a/pyproject.toml b/pyproject.toml
index 0ce502d..5bf6526 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,3 +40,6 @@ build-backend = "setuptools.build_meta"
 
 [tool.setuptools]
 packages = ["nickol_knx_mcp"]
+
+[tool.setuptools.package-data]
+nickol_knx_mcp = ["room_templates/*.yaml", "room_templates/*.md"]