diff --git a/changelog.d/tsk-hydxwo-orb-bridges.md b/changelog.d/tsk-hydxwo-orb-bridges.md
new file mode 100644
index 000000000..ab04c2769
--- /dev/null
+++ b/changelog.d/tsk-hydxwo-orb-bridges.md
@@ -0,0 +1,11 @@
+### Added
+
+- Orb bridges adapter contract (tinyagentos/orb/bridges/__init__.py):
+  - BridgeResult dataclass with bridge_id, title, installed, targets, instruction and to_dict()
+  - Pure helper functions: orbs_running, orb_host, target
+  - Auto-discovery via pkgutil.iter_modules in adapters()
+  - evaluate_all runs all adapters, logs errors per adapter, one failure does not hide others
+- MimiClaw reference adapter (tinyagentos/orb/bridges/mimiclaw.py):
+  - BRIDGE_ID="mimiclaw", TITLE="MimiClaw", APP_ID="mimiclaw", WS_PORT=18789
+  - installed() returns None (no host-side tool)
+  - evaluate() builds targets from LAN orbs running MimiClaw with WebSocket URL instruction
\ No newline at end of file
diff --git a/tests/orb/test_bridges.py b/tests/orb/test_bridges.py
new file mode 100644
index 000000000..76b46fdd9
--- /dev/null
+++ b/tests/orb/test_bridges.py
@@ -0,0 +1,244 @@
+#!/usr/bin/env python3
+"""Tests for tinyagentos/orb/bridges."""
+
+import sys
+from types import ModuleType, SimpleNamespace
+
+import pytest
+
+
+def test_orbs_running_filters_on_app_and_keeps_order():
+    """Test orbs_running filters on app and keeps input order."""
+    from tinyagentos.orb.bridges import orbs_running
+
+    lan_orbs = [
+        {"name": "orb-1", "app": "mimiclaw", "addresses": ["10.0.0.1"], "port": 80},
+        {"name": "orb-2", "app": "esphome", "addresses": ["10.0.0.2"], "port": 80},
+        {"name": "orb-3", "app": "mimiclaw", "addresses": ["10.0.0.3"], "port": 80},
+        {"name": "orb-4", "app": None, "addresses": ["10.0.0.4"], "port": 80},
+    ]
+
+    result = orbs_running(lan_orbs, "mimiclaw")
+
+    assert len(result) == 2
+    assert result[0]["name"] == "orb-1"
+    assert result[1]["name"] == "orb-3"
+
+
+def test_orb_host_ipv4_first():
+    """Test orb_host returns first IPv4 address."""
+    from tinyagentos.orb.bridges import orb_host
+
+    orb = {"addresses": ["10.0.0.5", "fe80::1"], "name": "orb-1"}
+    assert orb_host(orb) == "10.0.0.5"
+
+
+def test_orb_host_ipv6_wrapped():
+    """Test orb_host returns IPv6 address wrapped in brackets."""
+    from tinyagentos.orb.bridges import orb_host
+
+    orb = {"addresses": ["fe80::1"], "name": "orb-1"}
+    assert orb_host(orb) == "[fe80::1]"
+
+
+def test_orb_host_fallback_to_name_local():
+    """Test orb_host falls back to name.local when no addresses."""
+    from tinyagentos.orb.bridges import orb_host
+
+    orb = {"addresses": [], "name": "orb-1"}
+    assert orb_host(orb) == "orb-1.local"
+
+
+def test_orb_host_empty_name_returns_none():
+    """Test orb_host returns None when name is empty string."""
+    from tinyagentos.orb.bridges import orb_host
+
+    orb = {"addresses": [], "name": ""}
+    assert orb_host(orb) is None
+
+
+def test_orb_host_no_addresses_key_no_name_returns_none():
+    """Test orb_host returns None when dict has no addresses key and no name."""
+    from tinyagentos.orb.bridges import orb_host
+
+    orb = {}
+    assert orb_host(orb) is None
+
+
+def test_target_builds_dict():
+    """Test target builds the expected dict shape."""
+    from tinyagentos.orb.bridges import target
+
+    result = target("orb-1", "192.168.1.20", "Connect to ws://...")
+    assert result == {"orb": "orb-1", "address": "192.168.1.20", "instruction": "Connect to ws://..."}
+
+
+def test_bridge_result_to_dict_round_trip():
+    """Test BridgeResult.to_dict returns correct shape with targets as list of dicts."""
+    from tinyagentos.orb.bridges import BridgeResult
+
+    br = BridgeResult(
+        bridge_id="test",
+        title="Test Bridge",
+        installed=True,
+        targets=({"orb": "orb-1", "address": "1.2.3.4", "instruction": "connect"},),
+        instruction="Top instruction",
+    )
+
+    d = br.to_dict()
+    assert d["bridge_id"] == "test"
+    assert d["title"] == "Test Bridge"
+    assert d["installed"] is True
+    assert d["targets"] == [{"orb": "orb-1", "address": "1.2.3.4", "instruction": "connect"}]
+    assert d["instruction"] == "Top instruction"
+
+
+def test_adapters_includes_mimiclaw_and_sorted():
+    """Test adapters() includes mimiclaw module and all have BRIDGE_ID/TITLE/evaluate, sorted by BRIDGE_ID."""
+    from tinyagentos.orb.bridges import adapters
+
+    modules = adapters()
+    assert len(modules) >= 1
+    bridge_ids = [m.BRIDGE_ID for m in modules]
+    assert "mimiclaw" in bridge_ids
+    # Check sorted by BRIDGE_ID
+    assert bridge_ids == sorted(bridge_ids)
+    for m in modules:
+        assert hasattr(m, "BRIDGE_ID")
+        assert hasattr(m, "TITLE")
+        assert hasattr(m, "evaluate")
+        assert callable(m.evaluate)
+
+
+def test_adapters_raises_type_error_for_missing_evaluate(monkeypatch):
+    """Test adapters() raises TypeError for a module missing evaluate."""
+    import pkgutil
+    import importlib
+    import tinyagentos.orb.bridges as bridges_mod
+
+    # Create a fake module without evaluate
+    fake_module = ModuleType("tinyagentos.orb.bridges.broken")
+    fake_module.BRIDGE_ID = "broken"
+    fake_module.TITLE = "Broken Bridge"
+    # No evaluate attribute
+
+    def fake_iter_modules(path):
+        return [SimpleNamespace(name="broken")]
+
+    def fake_import_module(name):
+        return fake_module
+
+    monkeypatch.setattr(pkgutil, "iter_modules", fake_iter_modules)
+    monkeypatch.setattr(importlib, "import_module", fake_import_module)
+
+    with pytest.raises(TypeError, match="bridge adapter broken missing BRIDGE_ID/TITLE/evaluate"):
+        bridges_mod.adapters()
+
+
+def test_evaluate_all_monkeypatch_adapters(monkeypatch):
+    """Test evaluate_all with fake adapters, one raising RuntimeError."""
+    import tinyagentos.orb.bridges as bridges_mod
+
+    # Create good adapter module
+    good_module = ModuleType("tinyagentos.orb.bridges.good")
+    good_module.BRIDGE_ID = "good"
+    good_module.TITLE = "Good Bridge"
+    good_result = bridges_mod.BridgeResult(
+        bridge_id="good",
+        title="Good Bridge",
+        installed=False,
+        targets=(bridges_mod.target("orb-1", "1.2.3.4", "connect"),),
+        instruction="Good instruction",
+    )
+
+    def good_evaluate(lan_orbs, agent_buddy):
+        return good_result
+
+    good_module.evaluate = good_evaluate
+
+    # Create bad adapter module
+    bad_module = ModuleType("tinyagentos.orb.bridges.bad")
+    bad_module.BRIDGE_ID = "bad"
+    bad_module.TITLE = "Bad Bridge"
+
+    def bad_evaluate(lan_orbs, agent_buddy):
+        raise RuntimeError("adapter failed")
+
+    bad_module.evaluate = bad_evaluate
+
+    def fake_adapters():
+        return [bad_module, good_module]  # unsorted, evaluate_all doesn't sort
+
+    monkeypatch.setattr(bridges_mod, "adapters", fake_adapters)
+
+    result = bridges_mod.evaluate_all([], [])
+
+    assert len(result) == 2
+    # Find good and bad results
+    good_found = False
+    bad_found = False
+    for r in result:
+        if r.get("bridge_id") == "good":
+            good_found = True
+            assert r["title"] == "Good Bridge"
+            assert r["installed"] is False
+            assert len(r["targets"]) == 1
+            assert r["instruction"] == "Good instruction"
+        elif r.get("bridge_id") == "bad":
+            bad_found = True
+            assert r["title"] == "Bad Bridge"
+            assert r["error"] == "adapter_failed"
+    assert good_found
+    assert bad_found
+
+
+def test_mimiclaw_evaluate_two_orbs_one_matching():
+    """Test mimiclaw.evaluate with two LAN orbs, one matching."""
+    from tinyagentos.orb.bridges import mimiclaw
+
+    lan_orbs = [
+        {"name": "orb-1", "app": "mimiclaw", "addresses": ["192.168.1.20"], "port": 80},
+        {"name": "orb-2", "app": "esphome", "addresses": ["192.168.1.21"], "port": 80},
+    ]
+    agent_buddy = []
+
+    result = mimiclaw.evaluate(lan_orbs, agent_buddy)
+
+    assert result.bridge_id == "mimiclaw"
+    assert result.title == "MimiClaw"
+    assert result.installed is None
+    assert len(result.targets) == 1
+    assert result.targets[0]["orb"] == "orb-1"
+    assert result.targets[0]["address"] == "192.168.1.20"
+    assert result.targets[0]["instruction"] == "Connect a WebSocket client to ws://192.168.1.20:18789/"
+    assert result.instruction == "Connect a WebSocket client to the URL shown for your Orb."
+
+
+def test_mimiclaw_evaluate_empty_input():
+    """Test mimiclaw.evaluate with empty input returns no targets and correct instruction."""
+    from tinyagentos.orb.bridges import mimiclaw
+
+    result = mimiclaw.evaluate([], [])
+
+    assert result.bridge_id == "mimiclaw"
+    assert result.title == "MimiClaw"
+    assert result.installed is None
+    assert len(result.targets) == 0
+    assert result.instruction == "No Orb running MimiClaw found on the LAN."
+
+
+def test_mimiclaw_installed_returns_none():
+    """Test mimiclaw.installed returns None."""
+    from tinyagentos.orb.bridges import mimiclaw
+
+    assert mimiclaw.installed() is None
+
+
+def test_mimiclaw_constants():
+    """Test mimiclaw module constants."""
+    from tinyagentos.orb.bridges import mimiclaw
+
+    assert mimiclaw.BRIDGE_ID == "mimiclaw"
+    assert mimiclaw.TITLE == "MimiClaw"
+    assert mimiclaw.APP_ID == "mimiclaw"
+    assert mimiclaw.WS_PORT == 18789
\ No newline at end of file
diff --git a/tinyagentos/orb/bridges/__init__.py b/tinyagentos/orb/bridges/__init__.py
new file mode 100644
index 000000000..684fec539
--- /dev/null
+++ b/tinyagentos/orb/bridges/__init__.py
@@ -0,0 +1,110 @@
+"""Orb bridge adapters.
+
+Adapters are PURE. They take the lists that
+`tinyagentos.orb.discovery.browse_lan_orbs()` and `probe_agent_buddy()`
+already return and never call discovery, the network or a subprocess.
+
+Shapes (from tinyagentos/orb/discovery.py on dev):
+- LAN orb: {"name": str, "addresses": list[str], "port": int, "board": str|None, "app": str|None, "version": str|None}
+- Agent Buddy reply: {"device_id": str, "hostname": str, "address": str, "port": int, "boot": int}
+"""
+
+import importlib
+import logging
+import pkgutil
+from dataclasses import dataclass
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass(frozen=True)
+class BridgeResult:
+    bridge_id: str
+    title: str
+    installed: bool | None
+    targets: tuple[dict, ...]
+    instruction: str
+
+    def to_dict(self) -> dict:
+        return {
+            "bridge_id": self.bridge_id,
+            "title": self.title,
+            "installed": self.installed,
+            "targets": [dict(t) for t in self.targets],
+            "instruction": self.instruction,
+        }
+
+
+def orbs_running(lan_orbs: list[dict], app_id: str) -> list[dict]:
+    """Return orbs whose .get('app') == app_id, keeping input order."""
+    return [orb for orb in lan_orbs if orb.get("app") == app_id]
+
+
+def orb_host(orb: dict) -> str | None:
+    """Extract a host address from an orb dict.
+
+    Priority:
+    1. First IPv4 address (no colon) from addresses
+    2. First IPv6 address (contains colon) wrapped in brackets
+    3. Fallback to {name}.local if name is non-empty
+    4. None otherwise
+    """
+    addresses = orb.get("addresses") or []
+    for addr in addresses:
+        if ":" not in addr:
+            return addr
+    for addr in addresses:
+        if ":" in addr:
+            return f"[{addr}]"
+    name = orb.get("name")
+    if isinstance(name, str) and name:
+        return f"{name}.local"
+    return None
+
+
+def target(orb_name: str, address: str, instruction: str) -> dict:
+    """Build a target dict with fixed shape."""
+    return {"orb": orb_name, "address": address, "instruction": instruction}
+
+
+def adapters() -> list:
+    """Discover and load bridge adapter modules.
+
+    Iterates pkgutil.iter_modules(__path__), skips names starting with '_',
+    imports each module, and validates it has BRIDGE_ID (str), TITLE (str),
+    and a callable evaluate. Returns modules sorted by BRIDGE_ID.
+    """
+    modules = []
+    for module_info in pkgutil.iter_modules(__path__):
+        name = module_info.name
+        if name.startswith("_"):
+            continue
+        mod = importlib.import_module(f"{__name__}.{name}")
+        if not hasattr(mod, "BRIDGE_ID") or not hasattr(mod, "TITLE") or not hasattr(mod, "evaluate"):
+            raise TypeError(f"bridge adapter {name} missing BRIDGE_ID/TITLE/evaluate")
+        if not callable(mod.evaluate):
+            raise TypeError(f"bridge adapter {name} missing BRIDGE_ID/TITLE/evaluate")
+        modules.append(mod)
+    modules.sort(key=lambda m: m.BRIDGE_ID)
+    return modules
+
+
+def evaluate_all(lan_orbs: list[dict], agent_buddy: list[dict]) -> list[dict]:
+    """Evaluate all bridge adapters.
+
+    For each adapter, calls mod.evaluate(lan_orbs, agent_buddy).to_dict().
+    If an exception is raised, logs it and returns an error dict instead.
+    One broken adapter must not hide the others.
+    """
+    results = []
+    for mod in adapters():
+        try:
+            results.append(mod.evaluate(lan_orbs, agent_buddy).to_dict())
+        except Exception:
+            logger.exception("bridge adapter %s failed", mod.BRIDGE_ID)
+            results.append({
+                "bridge_id": mod.BRIDGE_ID,
+                "title": mod.TITLE,
+                "error": "adapter_failed",
+            })
+    return results
\ No newline at end of file
diff --git a/tinyagentos/orb/bridges/mimiclaw.py b/tinyagentos/orb/bridges/mimiclaw.py
new file mode 100644
index 000000000..f0fabf156
--- /dev/null
+++ b/tinyagentos/orb/bridges/mimiclaw.py
@@ -0,0 +1,48 @@
+"""MimiClaw bridge adapter.
+
+Reference adapter for the MimiClaw WebSocket interface.
+MimiClaw has no host-side tool; installed() returns None.
+"""
+
+from . import BridgeResult, orbs_running, orb_host, target
+
+BRIDGE_ID = "mimiclaw"
+TITLE = "MimiClaw"
+APP_ID = "mimiclaw"
+WS_PORT = 18789  # upstream memovai/mimiclaw main/mimi_config.h MIMI_WS_PORT
+
+
+def installed() -> bool | None:
+    """MimiClaw has no host-side tool."""
+    return None
+
+
+def evaluate(lan_orbs: list[dict], agent_buddy: list[dict]) -> BridgeResult:
+    """Evaluate MimiClaw bridges from discovered LAN orbs.
+
+    agent_buddy is unused (kept for adapter signature compatibility).
+    """
+    matching_orbs = orbs_running(lan_orbs, APP_ID)
+    targets = []
+    for orb in matching_orbs:
+        host = orb_host(orb)
+        if host is not None:
+            targets.append(
+                target(
+                    orb["name"],
+                    host,
+                    f"Connect a WebSocket client to ws://{host}:{WS_PORT}/",
+                )
+            )
+    targets_tuple = tuple(targets)
+    if targets:
+        instruction = "Connect a WebSocket client to the URL shown for your Orb."
+    else:
+        instruction = "No Orb running MimiClaw found on the LAN."
+    return BridgeResult(
+        bridge_id=BRIDGE_ID,
+        title=TITLE,
+        installed=installed(),
+        targets=targets_tuple,
+        instruction=instruction,
+    )
\ No newline at end of file