diff --git a/samsung_appliance/registry/adapter.py b/samsung_appliance/registry/adapter.py
new file mode 100644
index 0000000..ebfdaf0
--- /dev/null
+++ b/samsung_appliance/registry/adapter.py
@@ -0,0 +1,241 @@
+"""Adapter: a discovered BoundEntity list -> a RuntimeDescriptor the bridge
+consumes. Replaces the per-appliance flatten/build_discovery/command_handlers.
+"""
+from __future__ import annotations
+
+import json
+from dataclasses import dataclass, field
+from typing import Callable, Optional
+
+from ..poll_scheduler import PollTier
+from .discovery import BoundEntity
+from .entities import (
+    BinarySensorDesc, ButtonDesc, NumberDesc, PLATFORM_OF, SelectDesc,
+    SensorDesc, SwitchDesc,
+)
+
+_TIER_CADENCE = {'hot': (1.0, 0.5), 'warm': (15.0, None), 'cold': (300.0, None)}
+
+
+def _segs(href: str) -> list[str]:
+    return [s for s in href.strip('/').split('/') if s]
+
+
+def _key(b: BoundEntity) -> str:
+    return f"{b.desc.key}{b.instance}"
+
+
+def _encode(cfg: dict) -> bytes:
+    return json.dumps(cfg).encode()
+
+
+@dataclass
+class RuntimeDescriptor:
+    name: str
+    seed_path: list[str]
+    default_observe_port: int
+    observe_paths: list[list[str]]
+    poll_tiers: list[PollTier]
+    is_active: Optional[Callable[[dict], bool]]
+    flatten: Callable[[dict], dict]
+    discovery_payloads: list[tuple[str, bytes]]
+    command_handlers: Callable[[], dict]
+    project: Optional[Callable[[dict, dict], dict]]
+    on_observation: Optional[Callable[[dict, str, dict], None]]
+    remote_available_field: Optional[str]
+    cycle_active_field: Optional[str]
+    log_state_change: Optional[Callable[[dict], str]]
+
+
+def _make_flatten(bound: list[BoundEntity]) -> Callable[[dict], dict]:
+    reads = [b for b in bound if b.desc.field]   # buttons have no field
+
+    def flatten(links: dict) -> dict:
+        out: dict = {}
+        for b in reads:
+            rep = links.get(b.href) or {}
+            if b.desc.exists_fn is not None and not b.desc.exists_fn(rep):
+                continue
+            out[_key(b)] = b.desc.value_fn(rep.get(b.desc.field))
+        return out
+
+    return flatten
+
+
+def _make_observe_paths(bound: list[BoundEntity]) -> list[list[str]]:
+    seen, out = set(), []
+    for b in bound:
+        if not b.capability.observe or b.href in seen:
+            continue
+        seen.add(b.href)
+        out.append(_segs(b.href))
+    return out
+
+
+def _make_poll_tiers(bound: list[BoundEntity]) -> list[PollTier]:
+    groups: dict[str, set[str]] = {}
+    for b in bound:
+        groups.setdefault(b.capability.poll_tier, set()).add(b.href)
+    tiers: list[PollTier] = []
+    for name, hrefs in groups.items():
+        interval, active = _TIER_CADENCE.get(name, (15.0, None))
+        tiers.append(PollTier(
+            name=name, interval_s=interval, active_interval_s=active,
+            paths=tuple(tuple(_segs(h)) for h in sorted(hrefs))))
+    tiers.append(PollTier(name='sweep', interval_s=300.0,
+                          paths=(('device', '0'),), is_sweep=True))
+    return tiers
+
+
+def _make_is_active(bound):
+    caps = {b.href: b.capability for b in bound if b.capability.active_when}
+    if not caps:
+        return None
+
+    def is_active(links: dict) -> bool:
+        return any(cap.active_when(links.get(href) or {})
+                   for href, cap in caps.items())
+
+    return is_active
+
+
+def _make_on_observation(bound):
+    caps = {b.href: b.capability for b in bound if b.capability.on_observation}
+    if not caps:
+        return None
+
+    def on_observation(state: dict, href: str, rep: dict) -> None:
+        cap = caps.get(href)
+        if cap is not None:
+            cap.on_observation(state, rep)
+
+    return on_observation
+
+
+def _make_project(bound):
+    projs = []
+    seen = set()
+    for b in bound:
+        if b.capability.project and b.capability.href not in seen:
+            seen.add(b.capability.href)
+            projs.append(b.capability.project)
+    if not projs:
+        return None
+
+    def project(state: dict, sensors: dict) -> dict:
+        for p in projs:
+            sensors = p(state, sensors)
+        return sensors
+
+    return project
+
+
+def _make_command_handlers(bound):
+    writers = [b for b in bound if getattr(b.desc, 'write_fn', None)]
+
+    def command_handlers() -> dict:
+        out = {}
+        for b in writers:
+            href, fn = b.href, b.desc.write_fn
+
+            def handler(payload, links, _fn=fn, _href=href):
+                rep = (links or {}).get(_href) or {}
+                return _fn(payload, rep)
+
+            out[f"cmd/{_key(b)}"] = handler
+        return out
+
+    return command_handlers
+
+
+# --- MQTT discovery config emitters (per platform) ------------------------
+def _avail(topic_prefix):
+    return [{'topic': f"{topic_prefix}/availability",
+             'payload_available': 'online', 'payload_not_available': 'offline'}]
+
+
+def _device(topic_prefix, device_name, model):
+    return {'identifiers': [topic_prefix], 'name': device_name,
+            'manufacturer': 'Samsung', 'model': model}
+
+
+def _discovery_payloads(bound, topic_prefix, ha_prefix, device_name, model):
+    state_topic = f"{topic_prefix}/state"
+    dev = _device(topic_prefix, device_name, model)
+    avail = _avail(topic_prefix)
+    out = []
+    for b in bound:
+        d = b.desc
+        key = _key(b)
+        platform = PLATFORM_OF[type(d)]
+        uid = f"{topic_prefix}_{key}"
+        cfg = {'name': d.name or key, 'unique_id': uid, 'object_id': uid,
+               'device': dev, 'availability': avail}
+        if d.icon:
+            cfg['icon'] = d.icon
+        if d.entity_category:
+            cfg['entity_category'] = d.entity_category
+        if isinstance(d, SensorDesc):
+            cfg['state_topic'] = state_topic
+            cfg['value_template'] = f"{{{{ value_json.{key} }}}}"
+            for k, attr in (('unit_of_measurement', 'unit'),
+                            ('device_class', 'device_class'),
+                            ('state_class', 'state_class')):
+                if getattr(d, attr):
+                    cfg[k] = getattr(d, attr)
+        elif isinstance(d, BinarySensorDesc):
+            cfg['state_topic'] = state_topic
+            cfg['value_template'] = (
+                f"{{{{ 'ON' if value_json.{key} else 'OFF' }}}}")
+            cfg['payload_on'] = 'ON'
+            cfg['payload_off'] = 'OFF'
+            if d.device_class:
+                cfg['device_class'] = d.device_class
+        elif isinstance(d, SelectDesc):
+            cfg['state_topic'] = state_topic
+            cfg['value_template'] = f"{{{{ value_json.{key} }}}}"
+            cfg['command_topic'] = f"{topic_prefix}/cmd/{key}"
+            opts = d.options
+            cfg['options'] = list(opts) if isinstance(opts, (list, tuple)) else []
+        elif isinstance(d, SwitchDesc):
+            cfg['state_topic'] = state_topic
+            cfg['value_template'] = f"{{{{ value_json.{key} }}}}"
+            cfg['command_topic'] = f"{topic_prefix}/cmd/{key}"
+        elif isinstance(d, ButtonDesc):
+            cfg['command_topic'] = f"{topic_prefix}/cmd/{key}"
+            cfg['payload_press'] = d.payload
+        elif isinstance(d, NumberDesc):
+            cfg['state_topic'] = state_topic
+            cfg['value_template'] = f"{{{{ value_json.{key} }}}}"
+            cfg['command_topic'] = f"{topic_prefix}/cmd/{key}"
+            for k, attr in (('unit_of_measurement', 'unit'),
+                            ('device_class', 'device_class'),
+                            ('min', 'native_min'), ('max', 'native_max'),
+                            ('step', 'step')):
+                if getattr(d, attr) is not None:
+                    cfg[k] = getattr(d, attr)
+        out.append((f"{ha_prefix}/{platform}/{topic_prefix}/{key}/config",
+                    _encode(cfg)))
+    return out
+
+
+def build_runtime_descriptor(bound, *, topic_prefix, ha_prefix, device_name,
+                             model, name, default_port) -> RuntimeDescriptor:
+    produced = {_key(b) for b in bound}
+    return RuntimeDescriptor(
+        name=name,
+        seed_path=['device', '0'],
+        default_observe_port=default_port,
+        observe_paths=_make_observe_paths(bound),
+        poll_tiers=_make_poll_tiers(bound),
+        is_active=_make_is_active(bound),
+        flatten=_make_flatten(bound),
+        discovery_payloads=_discovery_payloads(
+            bound, topic_prefix, ha_prefix, device_name, model),
+        command_handlers=_make_command_handlers(bound),
+        project=_make_project(bound),
+        on_observation=_make_on_observation(bound),
+        remote_available_field='remote_control' if 'remote_control' in produced else None,
+        cycle_active_field=None,
+        log_state_change=None,
+    )
diff --git a/tests/test_adapter.py b/tests/test_adapter.py
new file mode 100644
index 0000000..5d6c6d9
--- /dev/null
+++ b/tests/test_adapter.py
@@ -0,0 +1,40 @@
+import json
+
+from samsung_appliance.registry.adapter import build_runtime_descriptor
+from samsung_appliance.registry.capabilities import common
+from samsung_appliance.registry.discovery import discover
+
+
+def _bound(resources):
+    reg = {c.href: c for c in (common.KIDS_LOCK, common.ENERGY_METER)}
+    return discover(resources, reg)
+
+
+def test_flatten_applies_value_fn(dishwasher_resources):
+    rd = build_runtime_descriptor(
+        _bound(dishwasher_resources), topic_prefix='t', ha_prefix='homeassistant',
+        device_name='Dishwasher', model='M', name='dishwasher', default_port=49154)
+    flat = rd.flatten(dishwasher_resources)
+    assert flat['power_watts'] is not None
+    assert isinstance(flat['child_lock'], bool)
+
+
+def test_observe_paths_are_segment_lists(dishwasher_resources):
+    rd = build_runtime_descriptor(
+        _bound(dishwasher_resources), topic_prefix='t', ha_prefix='homeassistant',
+        device_name='Dishwasher', model='M', name='dishwasher', default_port=49154)
+    assert ['kidslock', 'vs', '0'] in rd.observe_paths
+
+
+def test_discovery_payloads_have_unique_ids(dishwasher_resources):
+    rd = build_runtime_descriptor(
+        _bound(dishwasher_resources), topic_prefix='samsung_dishwasher',
+        ha_prefix='homeassistant', device_name='Dishwasher', model='M',
+        name='dishwasher', default_port=49154)
+    topics = [t for t, _ in rd.discovery_payloads]
+    # one config topic per produced sensor/binary_sensor entity
+    assert any('/binary_sensor/samsung_dishwasher/child_lock/config' in t for t in topics)
+    assert any('/sensor/samsung_dishwasher/power_watts/config' in t for t in topics)
+    # payloads are JSON bytes carrying unique_id
+    cfg = json.loads(next(p for t, p in rd.discovery_payloads if 'child_lock' in t))
+    assert cfg['unique_id'] == 'samsung_dishwasher_child_lock'