diff --git a/dev-tools/tests/agent_dag/analyse_trace.py b/dev-tools/tests/agent_dag/analyse_trace.py
new file mode 100644
index 00000000..b71cdebe
--- /dev/null
+++ b/dev-tools/tests/agent_dag/analyse_trace.py
@@ -0,0 +1,319 @@
+#!/usr/bin/env python3
+"""
+Analyse a captured agent trace JSON file and check DAG integrity.
+
+Usage:
+    python analyse_trace.py react.json
+    python analyse_trace.py -u http://localhost:8088/ react.json
+"""
+
+import argparse
+import asyncio
+import json
+import os
+import sys
+import websockets
+
+DEFAULT_URL = os.getenv("TRUSTGRAPH_URL", "http://localhost:8088/")
+DEFAULT_USER = "trustgraph"
+DEFAULT_COLLECTION = "default"
+DEFAULT_FLOW = "default"
+GRAPH = "urn:graph:retrieval"
+
+# Namespace prefixes
+PROV = "http://www.w3.org/ns/prov#"
+RDF = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+RDFS = "http://www.w3.org/2000/01/rdf-schema#"
+TG = "https://trustgraph.ai/ns/"
+
+PROV_WAS_DERIVED_FROM = PROV + "wasDerivedFrom"
+RDF_TYPE = RDF + "type"
+
+TG_ANALYSIS = TG + "Analysis"
+TG_TOOL_USE = TG + "ToolUse"
+TG_OBSERVATION_TYPE = TG + "Observation"
+TG_CONCLUSION = TG + "Conclusion"
+TG_SYNTHESIS = TG + "Synthesis"
+TG_QUESTION = TG + "Question"
+
+
+def shorten(uri):
+    """Shorten a URI for display."""
+    for prefix, short in [
+        (PROV, "prov:"), (RDF, "rdf:"), (RDFS, "rdfs:"), (TG, "tg:"),
+    ]:
+        if isinstance(uri, str) and uri.startswith(prefix):
+            return short + uri[len(prefix):]
+    return str(uri)
+
+
+async def fetch_triples(ws, flow, subject, user, collection, request_counter):
+    """Query triples for a given subject URI."""
+    request_counter[0] += 1
+    req_id = f"q-{request_counter[0]}"
+
+    msg = {
+        "id": req_id,
+        "service": "triples",
+        "flow": flow,
+        "request": {
+            "s": {"t": "i", "i": subject},
+            "g": GRAPH,
+            "user": user,
+            "collection": collection,
+            "limit": 100,
+        },
+    }
+
+    await ws.send(json.dumps(msg))
+
+    while True:
+        raw = await ws.recv()
+        resp = json.loads(raw)
+        if resp.get("id") == req_id:
+            inner = resp.get("response", {})
+            if isinstance(inner, dict):
+                return inner.get("response", [])
+            return inner
+
+
+def extract_term(term):
+    """Extract value from wire-format term."""
+    if not term:
+        return ""
+    t = term.get("t", "")
+    if t == "i":
+        return term.get("i", "")
+    elif t == "l":
+        return term.get("v", "")
+    elif t == "t":
+        tr = term.get("tr", {})
+        return {
+            "s": extract_term(tr.get("s", {})),
+            "p": extract_term(tr.get("p", {})),
+            "o": extract_term(tr.get("o", {})),
+        }
+    return str(term)
+
+
+def parse_triples(wire_triples):
+    """Convert wire triples to (s, p, o) tuples."""
+    result = []
+    for t in wire_triples:
+        s = extract_term(t.get("s", {}))
+        p = extract_term(t.get("p", {}))
+        o = extract_term(t.get("o", {}))
+        result.append((s, p, o))
+    return result
+
+
+def get_types(tuples):
+    """Get rdf:type values from parsed triples."""
+    return {o for s, p, o in tuples if p == RDF_TYPE}
+
+
+def get_derived_from(tuples):
+    """Get prov:wasDerivedFrom targets from parsed triples."""
+    return [o for s, p, o in tuples if p == PROV_WAS_DERIVED_FROM]
+
+
+async def analyse(path, url, flow, user, collection):
+    with open(path) as f:
+        messages = json.load(f)
+
+    print(f"Total messages: {len(messages)}")
+    print()
+
+    # ---- Pass 1: collect explain IDs and check streaming chunks ----
+
+    explain_ids = []
+    errors = []
+
+    for i, msg in enumerate(messages):
+        resp = msg.get("response", {})
+        chunk_type = resp.get("chunk_type", "?")
+
+        if chunk_type == "explain":
+            explain_id = resp.get("explain_id", "")
+            explain_ids.append(explain_id)
+            print(f"  {i:3d}  {chunk_type}  {explain_id}")
+        else:
+            print(f"  {i:3d}  {chunk_type}")
+
+        # Rule 7: message_id on content chunks
+        if chunk_type in ("thought", "observation", "answer"):
+            mid = resp.get("message_id", "")
+            if not mid:
+                errors.append(
+                    f"[msg {i}] {chunk_type} chunk missing message_id"
+                )
+
+    print()
+    print(f"Explain IDs ({len(explain_ids)}):")
+    for eid in explain_ids:
+        print(f"  {eid}")
+
+    # ---- Pass 2: fetch triples for each explain ID ----
+
+    ws_url = url.replace("http://", "ws://").replace("https://", "wss://")
+    ws_url = f"{ws_url.rstrip('/')}/api/v1/socket"
+
+    request_counter = [0]
+    # entity_id -> parsed triples [(s, p, o), ...]
+    entities = {}
+
+    print()
+    print("Fetching triples...")
+    print()
+
+    async with websockets.connect(ws_url, ping_interval=20, ping_timeout=60) as ws:
+        for eid in explain_ids:
+            wire = await fetch_triples(
+                ws, flow, eid, user, collection, request_counter,
+            )
+
+            tuples = parse_triples(wire) if isinstance(wire, list) else []
+            entities[eid] = tuples
+
+            print(f"  {eid}")
+            for s, p, o in tuples:
+                o_short = str(o)
+                if len(o_short) > 80:
+                    o_short = o_short[:77] + "..."
+                print(f"    {shorten(p)} = {o_short}")
+            print()
+
+    # ---- Pass 3: check rules ----
+
+    all_ids = set(entities.keys())
+
+    # Collect entity metadata
+    roots = []           # entities with no wasDerivedFrom
+    conclusions = []     # tg:Conclusion entities
+    analyses = []        # tg:Analysis entities
+    observations = []    # tg:Observation entities
+
+    for eid, tuples in entities.items():
+        types = get_types(tuples)
+        parents = get_derived_from(tuples)
+
+        if not tuples:
+            errors.append(f"[{eid}] entity has no triples in store")
+
+        if not parents:
+            roots.append(eid)
+
+        if TG_CONCLUSION in types:
+            conclusions.append(eid)
+        if TG_ANALYSIS in types:
+            analyses.append(eid)
+        if TG_OBSERVATION_TYPE in types:
+            observations.append(eid)
+
+        # Rule 4: every non-root entity has wasDerivedFrom
+        if parents:
+            for parent in parents:
+                # Rule 5: parent exists in known entities
+                if parent not in all_ids:
+                    errors.append(
+                        f"[{eid}] wasDerivedFrom target not in explain set: "
+                        f"{parent}"
+                    )
+
+        # Rule 6: Analysis entities must have ToolUse type
+        if TG_ANALYSIS in types and TG_TOOL_USE not in types:
+            errors.append(
+                f"[{eid}] Analysis entity missing tg:ToolUse type"
+            )
+
+    # Rule 1: exactly one root
+    if len(roots) == 0:
+        errors.append("No root entity found (all have wasDerivedFrom)")
+    elif len(roots) > 1:
+        errors.append(
+            f"Multiple roots ({len(roots)}) — expected exactly 1:"
+        )
+        for r in roots:
+            types = get_types(entities[r])
+            type_labels = ", ".join(shorten(t) for t in types)
+            errors.append(f"  root: {r} [{type_labels}]")
+
+    # Rule 2: exactly one terminal node (nothing derives from it)
+    # Build set of entities that are parents of something
+    has_children = set()
+    for eid, tuples in entities.items():
+        for parent in get_derived_from(tuples):
+            has_children.add(parent)
+
+    terminals = [eid for eid in all_ids if eid not in has_children]
+    if len(terminals) == 0:
+        errors.append("No terminal entity found (cycle?)")
+    elif len(terminals) > 1:
+        errors.append(
+            f"Multiple terminal entities ({len(terminals)}) — expected exactly 1:"
+        )
+        for t in terminals:
+            types = get_types(entities[t])
+            type_labels = ", ".join(shorten(ty) for ty in types)
+            errors.append(f"  terminal: {t} [{type_labels}]")
+
+    # Rule 8: Observation should not derive from Analysis if a sub-trace
+    # exists as a sibling. Check: if an Analysis has both a Question child
+    # and an Observation child, the Observation should derive from the
+    # sub-trace's Synthesis, not from the Analysis.
+    for obs_id in observations:
+        obs_parents = get_derived_from(entities[obs_id])
+        for parent in obs_parents:
+            if parent in entities:
+                parent_types = get_types(entities[parent])
+                if TG_ANALYSIS in parent_types:
+                    # Check if this Analysis also has a Question child
+                    # (i.e. a sub-trace exists)
+                    has_subtrace = False
+                    for other_id, other_tuples in entities.items():
+                        if other_id == obs_id:
+                            continue
+                        other_parents = get_derived_from(other_tuples)
+                        other_types = get_types(other_tuples)
+                        if (parent in other_parents
+                                and TG_QUESTION in other_types):
+                            has_subtrace = True
+                            break
+                    if has_subtrace:
+                        errors.append(
+                            f"[{obs_id}] Observation derives from Analysis "
+                            f"{parent} which has a sub-trace — should derive "
+                            f"from the sub-trace's Synthesis instead"
+                        )
+
+    # ---- Report ----
+
+    print()
+    print("=" * 60)
+    if errors:
+        print(f"ERRORS ({len(errors)}):")
+        print()
+        for err in errors:
+            print(f"  !! {err}")
+    else:
+        print("ALL CHECKS PASSED")
+    print("=" * 60)
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("input", help="JSON trace file")
+    parser.add_argument("-u", "--url", default=DEFAULT_URL)
+    parser.add_argument("-f", "--flow", default=DEFAULT_FLOW)
+    parser.add_argument("-U", "--user", default=DEFAULT_USER)
+    parser.add_argument("-C", "--collection", default=DEFAULT_COLLECTION)
+    args = parser.parse_args()
+
+    asyncio.run(analyse(
+        args.input, args.url, args.flow,
+        args.user, args.collection,
+    ))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/dev-tools/tests/agent_dag/ws_capture.py b/dev-tools/tests/agent_dag/ws_capture.py
new file mode 100644
index 00000000..3002d563
--- /dev/null
+++ b/dev-tools/tests/agent_dag/ws_capture.py
@@ -0,0 +1,81 @@
+#!/usr/bin/env python3
+"""
+Connect to TrustGraph websocket, run an agent query, capture all
+response messages to a JSON file.
+
+Usage:
+    python ws_capture.py -q "What is the document about?" -o trace.json
+    python ws_capture.py -q "..." -u http://localhost:8088/ -o out.json
+"""
+
+import argparse
+import asyncio
+import json
+import os
+import websockets
+
+DEFAULT_URL = os.getenv("TRUSTGRAPH_URL", "http://localhost:8088/")
+DEFAULT_USER = "trustgraph"
+DEFAULT_COLLECTION = "default"
+DEFAULT_FLOW = "default"
+
+
+async def capture(url, flow, question, user, collection, output):
+
+    # Convert to ws URL
+    ws_url = url.replace("http://", "ws://").replace("https://", "wss://")
+    ws_url = f"{ws_url.rstrip('/')}/api/v1/socket"
+
+    async with websockets.connect(ws_url, ping_interval=20, ping_timeout=120) as ws:
+
+        request = {
+            "id": "capture",
+            "service": "agent",
+            "flow": flow,
+            "request": {
+                "question": question,
+                "user": user,
+                "collection": collection,
+                "streaming": True,
+            },
+        }
+
+        await ws.send(json.dumps(request))
+
+        messages = []
+
+        async for raw in ws:
+            msg = json.loads(raw)
+
+            if msg.get("id") != "capture":
+                continue
+
+            messages.append(msg)
+
+            if msg.get("complete"):
+                break
+
+    with open(output, "w") as f:
+        json.dump(messages, f, indent=2)
+
+    print(f"Captured {len(messages)} messages to {output}")
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("-q", "--question", required=True)
+    parser.add_argument("-o", "--output", default="trace.json")
+    parser.add_argument("-u", "--url", default=DEFAULT_URL)
+    parser.add_argument("-f", "--flow", default=DEFAULT_FLOW)
+    parser.add_argument("-U", "--user", default=DEFAULT_USER)
+    parser.add_argument("-C", "--collection", default=DEFAULT_COLLECTION)
+    args = parser.parse_args()
+
+    asyncio.run(capture(
+        args.url, args.flow, args.question,
+        args.user, args.collection, args.output,
+    ))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/dev-tools/tests/librarian/simple_text_download.py b/dev-tools/tests/librarian/simple_text_download.py
new file mode 100644
index 00000000..6af2a60d
--- /dev/null
+++ b/dev-tools/tests/librarian/simple_text_download.py
@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+"""
+Minimal example: download a text document in tiny chunks via websocket API
+"""
+
+import asyncio
+import json
+import base64
+import websockets
+
+async def main():
+    url = "ws://localhost:8088/api/v1/socket"
+
+    document_id = "test-chunked-doc-001"
+    chunk_size = 10  # Tiny chunks!
+
+    request_id = 0
+
+    async def send_request(ws, request):
+        nonlocal request_id
+        request_id += 1
+        msg = {
+            "id": f"req-{request_id}",
+            "service": "librarian",
+            "request": request
+        }
+        await ws.send(json.dumps(msg))
+        response = json.loads(await ws.recv())
+        if "error" in response:
+            raise Exception(response["error"])
+        return response.get("response", {})
+
+    async with websockets.connect(url) as ws:
+
+        print(f"Fetching document: {document_id}")
+        print(f"Chunk size: {chunk_size} bytes")
+        print()
+
+        chunk_index = 0
+        all_content = b""
+
+        while True:
+            resp = await send_request(ws, {
+                "operation": "stream-document",
+                "user": "trustgraph",
+                "document-id": document_id,
+                "chunk-index": chunk_index,
+                "chunk-size": chunk_size,
+            })
+
+            chunk_data = base64.b64decode(resp["content"])
+            total_chunks = resp["total-chunks"]
+            total_bytes = resp["total-bytes"]
+
+            print(f"Chunk {chunk_index}: {chunk_data}")
+
+            all_content += chunk_data
+            chunk_index += 1
+
+            if chunk_index >= total_chunks:
+                break
+
+        print()
+        print(f"Complete: {all_content}")
+
+if __name__ == "__main__":
+    asyncio.run(main())
diff --git a/dev-tools/tests/librarian/simple_text_upload.py b/dev-tools/tests/librarian/simple_text_upload.py
new file mode 100644
index 00000000..e21bd185
--- /dev/null
+++ b/dev-tools/tests/librarian/simple_text_upload.py
@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+"""
+Minimal example: upload a small text document via websocket API
+"""
+
+import asyncio
+import json
+import base64
+import time
+import websockets
+
+async def main():
+    url = "ws://localhost:8088/api/v1/socket"
+
+    # Small text content
+    content = b"AAAAAAAAAABBBBBBBBBBCCCCCCCCCC"
+
+    request_id = 0
+
+    async def send_request(ws, request):
+        nonlocal request_id
+        request_id += 1
+        msg = {
+            "id": f"req-{request_id}",
+            "service": "librarian",
+            "request": request
+        }
+        await ws.send(json.dumps(msg))
+        response = json.loads(await ws.recv())
+        if "error" in response:
+            raise Exception(response["error"])
+        return response.get("response", {})
+
+    async with websockets.connect(url) as ws:
+
+        print(f"Uploading {len(content)} bytes...")
+
+        resp = await send_request(ws, {
+            "operation": "add-document",
+            "document-metadata": {
+                "id": "test-chunked-doc-001",
+                "time": int(time.time()),
+                "kind": "text/plain",
+                "title": "My Test Document",
+                "comments": "Small doc for chunk testing",
+                "user": "trustgraph",
+                "tags": ["test"],
+                "metadata": [],
+            },
+            "content": base64.b64encode(content).decode("utf-8"),
+        })
+
+        print("Done!")
+
+if __name__ == "__main__":
+    asyncio.run(main())
diff --git a/dev-tools/tests/relay/test_rev_gateway.py b/dev-tools/tests/relay/test_rev_gateway.py
new file mode 100644
index 00000000..fe200e46
--- /dev/null
+++ b/dev-tools/tests/relay/test_rev_gateway.py
@@ -0,0 +1,237 @@
+#!/usr/bin/env python3
+"""
+WebSocket Test Client
+
+A simple client to test the reverse gateway through the relay.
+Connects to the relay's /in endpoint and allows sending test messages.
+
+Usage:
+    python test_client.py [--uri URI] [--interactive]
+"""
+
+import asyncio
+import json
+import logging
+import argparse
+import uuid
+from aiohttp import ClientSession, WSMsgType
+
+# Configure logging
+logging.basicConfig(
+    level=logging.INFO,
+    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
+)
+logger = logging.getLogger("test_client")
+
+class TestClient:
+    """Simple WebSocket test client"""
+    
+    def __init__(self, uri: str):
+        self.uri = uri
+        self.session = None
+        self.ws = None
+        self.running = False
+        self.message_counter = 0
+        self.client_id = str(uuid.uuid4())[:8]
+        
+    async def connect(self):
+        """Connect to the WebSocket"""
+        self.session = ClientSession()
+        logger.info(f"Connecting to {self.uri}")
+        self.ws = await self.session.ws_connect(self.uri)
+        logger.info("Connected successfully")
+        
+    async def disconnect(self):
+        """Disconnect from WebSocket"""
+        if self.ws and not self.ws.closed:
+            await self.ws.close()
+        if self.session and not self.session.closed:
+            await self.session.close()
+        logger.info("Disconnected")
+        
+    async def send_message(self, service: str, request_data: dict, flow: str = "default"):
+        """Send a properly formatted TrustGraph message"""
+        self.message_counter += 1
+        message = {
+            "id": f"{self.client_id}-{self.message_counter}",
+            "service": service,
+            "request": request_data,
+            "flow": flow
+        }
+        
+        message_json = json.dumps(message, indent=2)
+        logger.info(f"Sending message:\n{message_json}")
+        await self.ws.send_str(json.dumps(message))
+        
+    async def listen_for_responses(self):
+        """Listen for incoming messages"""
+        logger.info("Listening for responses...")
+        
+        async for msg in self.ws:
+            if msg.type == WSMsgType.TEXT:
+                try:
+                    response = json.loads(msg.data)
+                    logger.info(f"Received response:\n{json.dumps(response, indent=2)}")
+                except json.JSONDecodeError:
+                    logger.info(f"Received text: {msg.data}")
+            elif msg.type == WSMsgType.BINARY:
+                logger.info(f"Received binary data: {len(msg.data)} bytes")
+            elif msg.type == WSMsgType.ERROR:
+                logger.error(f"WebSocket error: {self.ws.exception()}")
+                break
+            else:
+                logger.info(f"Connection closed: {msg.type}")
+                break
+                
+    async def interactive_mode(self):
+        """Interactive mode for manual testing"""
+        print("\n=== Interactive Test Client ===")
+        print("Available commands:")
+        print("  text-completion - Test text completion service")
+        print("  agent          - Test agent service")
+        print("  embeddings     - Test embeddings service")
+        print("  custom         - Send custom message")
+        print("  quit           - Exit")
+        print()
+        
+        # Start response listener
+        listen_task = asyncio.create_task(self.listen_for_responses())
+        
+        try:
+            while True:
+                try:
+                    command = input("Command> ").strip().lower()
+                    
+                    if command == "quit":
+                        break
+                    elif command == "text-completion":
+                        await self.send_message("text-completion", {
+                            "system": "You are a helpful assistant.",
+                            "prompt": "What is 2+2?"
+                        })
+                    elif command == "agent":
+                        await self.send_message("agent", {
+                            "question": "What is the capital of France?"
+                        })
+                    elif command == "embeddings":
+                        await self.send_message("embeddings", {
+                            "text": "Hello world"
+                        })
+                    elif command == "custom":
+                        service = input("Service name> ").strip()
+                        request_json = input("Request JSON> ").strip()
+                        try:
+                            request_data = json.loads(request_json)
+                            await self.send_message(service, request_data)
+                        except json.JSONDecodeError as e:
+                            print(f"Invalid JSON: {e}")
+                    elif command == "":
+                        continue
+                    else:
+                        print(f"Unknown command: {command}")
+                        
+                except KeyboardInterrupt:
+                    break
+                except EOFError:
+                    break
+                except Exception as e:
+                    logger.error(f"Error in interactive mode: {e}")
+                    
+        finally:
+            listen_task.cancel()
+            try:
+                await listen_task
+            except asyncio.CancelledError:
+                pass
+            
+    async def run_predefined_tests(self):
+        """Run a series of predefined tests"""
+        print("\n=== Running Predefined Tests ===")
+        
+        # Start response listener
+        listen_task = asyncio.create_task(self.listen_for_responses())
+        
+        try:
+            # Test 1: Text completion
+            print("\n1. Testing text-completion service...")
+            await self.send_message("text-completion", {
+                "system": "You are a helpful assistant.",
+                "prompt": "What is 2+2?"
+            })
+            await asyncio.sleep(2)
+            
+            # Test 2: Agent
+            print("\n2. Testing agent service...")
+            await self.send_message("agent", {
+                "question": "What is the capital of France?"
+            })
+            await asyncio.sleep(2)
+            
+            # Test 3: Embeddings
+            print("\n3. Testing embeddings service...")
+            await self.send_message("embeddings", {
+                "text": "Hello world"
+            })
+            await asyncio.sleep(2)
+            
+            # Test 4: Invalid service
+            print("\n4. Testing invalid service...")
+            await self.send_message("nonexistent-service", {
+                "test": "data"
+            })
+            await asyncio.sleep(2)
+            
+            print("\nTests completed. Waiting for any remaining responses...")
+            await asyncio.sleep(3)
+            
+        finally:
+            listen_task.cancel()
+            try:
+                await listen_task
+            except asyncio.CancelledError:
+                pass
+
+async def main():
+    parser = argparse.ArgumentParser(
+        description="WebSocket Test Client for Reverse Gateway"
+    )
+    parser.add_argument(
+        '--uri',
+        default='ws://localhost:8080/in',
+        help='WebSocket URI to connect to (default: ws://localhost:8080/in)'
+    )
+    parser.add_argument(
+        '--interactive', '-i',
+        action='store_true',
+        help='Run in interactive mode'
+    )
+    parser.add_argument(
+        '--verbose', '-v',
+        action='store_true',
+        help='Enable verbose logging'
+    )
+    
+    args = parser.parse_args()
+    
+    if args.verbose:
+        logging.getLogger().setLevel(logging.DEBUG)
+    
+    client = TestClient(args.uri)
+    
+    try:
+        await client.connect()
+        
+        if args.interactive:
+            await client.interactive_mode()
+        else:
+            await client.run_predefined_tests()
+            
+    except KeyboardInterrupt:
+        print("\nShutdown requested by user")
+    except Exception as e:
+        logger.error(f"Client error: {e}")
+    finally:
+        await client.disconnect()
+
+if __name__ == "__main__":
+    asyncio.run(main())
\ No newline at end of file
diff --git a/dev-tools/tests/relay/websocket_relay.py b/dev-tools/tests/relay/websocket_relay.py
new file mode 100644
index 00000000..d537f7da
--- /dev/null
+++ b/dev-tools/tests/relay/websocket_relay.py
@@ -0,0 +1,210 @@
+#!/usr/bin/env python3
+"""
+WebSocket Relay Test Harness
+
+This script creates a relay server with two WebSocket endpoints:
+- /in  - for test clients to connect to
+- /out - for reverse gateway to connect to
+
+Messages are bidirectionally relayed between the two connections.
+
+Usage:
+    python websocket_relay.py [--port PORT] [--host HOST]
+"""
+
+import asyncio
+import logging
+import argparse
+from aiohttp import web, WSMsgType
+import weakref
+from typing import Optional, Set
+
+# Configure logging
+logging.basicConfig(
+    level=logging.INFO,
+    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
+)
+logger = logging.getLogger("websocket_relay")
+
+class WebSocketRelay:
+    """WebSocket relay that forwards messages between 'in' and 'out' connections"""
+    
+    def __init__(self):
+        self.in_connections: Set = weakref.WeakSet()
+        self.out_connections: Set = weakref.WeakSet()
+        
+    async def handle_in_connection(self, request):
+        """Handle incoming connections on /in endpoint"""
+        ws = web.WebSocketResponse()
+        await ws.prepare(request)
+        
+        self.in_connections.add(ws)
+        logger.info(f"New 'in' connection. Total in: {len(self.in_connections)}, out: {len(self.out_connections)}")
+        
+        try:
+            async for msg in ws:
+                if msg.type == WSMsgType.TEXT:
+                    data = msg.data
+                    logger.info(f"IN → OUT: {data}")
+                    await self._forward_to_out(data)
+                elif msg.type == WSMsgType.BINARY:
+                    data = msg.data
+                    logger.info(f"IN → OUT: {len(data)} bytes (binary)")
+                    await self._forward_to_out(data, binary=True)
+                elif msg.type == WSMsgType.ERROR:
+                    logger.error(f"WebSocket error on 'in' connection: {ws.exception()}")
+                    break
+                else:
+                    break
+        except Exception as e:
+            logger.error(f"Error in 'in' connection handler: {e}")
+        finally:
+            logger.info(f"'in' connection closed. Remaining in: {len(self.in_connections)}, out: {len(self.out_connections)}")
+            
+        return ws
+    
+    async def handle_out_connection(self, request):
+        """Handle outgoing connections on /out endpoint"""
+        ws = web.WebSocketResponse()
+        await ws.prepare(request)
+        
+        self.out_connections.add(ws)
+        logger.info(f"New 'out' connection. Total in: {len(self.in_connections)}, out: {len(self.out_connections)}")
+        
+        try:
+            async for msg in ws:
+                if msg.type == WSMsgType.TEXT:
+                    data = msg.data
+                    logger.info(f"OUT → IN: {data}")
+                    await self._forward_to_in(data)
+                elif msg.type == WSMsgType.BINARY:
+                    data = msg.data
+                    logger.info(f"OUT → IN: {len(data)} bytes (binary)")
+                    await self._forward_to_in(data, binary=True)
+                elif msg.type == WSMsgType.ERROR:
+                    logger.error(f"WebSocket error on 'out' connection: {ws.exception()}")
+                    break
+                else:
+                    break
+        except Exception as e:
+            logger.error(f"Error in 'out' connection handler: {e}")
+        finally:
+            logger.info(f"'out' connection closed. Remaining in: {len(self.in_connections)}, out: {len(self.out_connections)}")
+            
+        return ws
+    
+    async def _forward_to_out(self, data, binary=False):
+        """Forward message from 'in' to all 'out' connections"""
+        if not self.out_connections:
+            logger.warning("No 'out' connections available to forward message")
+            return
+            
+        closed_connections = []
+        for ws in list(self.out_connections):
+            try:
+                if ws.closed:
+                    closed_connections.append(ws)
+                    continue
+                    
+                if binary:
+                    await ws.send_bytes(data)
+                else:
+                    await ws.send_str(data)
+            except Exception as e:
+                logger.error(f"Error forwarding to 'out' connection: {e}")
+                closed_connections.append(ws)
+        
+        # Clean up closed connections
+        for ws in closed_connections:
+            if ws in self.out_connections:
+                self.out_connections.discard(ws)
+    
+    async def _forward_to_in(self, data, binary=False):
+        """Forward message from 'out' to all 'in' connections"""
+        if not self.in_connections:
+            logger.warning("No 'in' connections available to forward message")
+            return
+            
+        closed_connections = []
+        for ws in list(self.in_connections):
+            try:
+                if ws.closed:
+                    closed_connections.append(ws)
+                    continue
+                    
+                if binary:
+                    await ws.send_bytes(data)
+                else:
+                    await ws.send_str(data)
+            except Exception as e:
+                logger.error(f"Error forwarding to 'in' connection: {e}")
+                closed_connections.append(ws)
+        
+        # Clean up closed connections
+        for ws in closed_connections:
+            if ws in self.in_connections:
+                self.in_connections.discard(ws)
+
+async def create_app(relay):
+    """Create the web application with routes"""
+    app = web.Application()
+    
+    # Add routes
+    app.router.add_get('/in', relay.handle_in_connection)
+    app.router.add_get('/out', relay.handle_out_connection)
+    
+    # Add a simple status endpoint
+    async def status(request):
+        status_info = {
+            'in_connections': len(relay.in_connections),
+            'out_connections': len(relay.out_connections),
+            'status': 'running'
+        }
+        return web.json_response(status_info)
+    
+    app.router.add_get('/status', status)
+    app.router.add_get('/', status)  # Root also shows status
+    
+    return app
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="WebSocket Relay Test Harness"
+    )
+    parser.add_argument(
+        '--host', 
+        default='localhost',
+        help='Host to bind to (default: localhost)'
+    )
+    parser.add_argument(
+        '--port', 
+        type=int, 
+        default=8080,
+        help='Port to bind to (default: 8080)'
+    )
+    parser.add_argument(
+        '--verbose', '-v',
+        action='store_true',
+        help='Enable verbose logging'
+    )
+    
+    args = parser.parse_args()
+    
+    if args.verbose:
+        logging.getLogger().setLevel(logging.DEBUG)
+    
+    relay = WebSocketRelay()
+    
+    print(f"Starting WebSocket Relay on {args.host}:{args.port}")
+    print(f"  'in' endpoint:  ws://{args.host}:{args.port}/in")
+    print(f"  'out' endpoint: ws://{args.host}:{args.port}/out")
+    print(f"  Status:         http://{args.host}:{args.port}/status")
+    print()
+    print("Usage:")
+    print(f"  Test client connects to:     ws://{args.host}:{args.port}/in")
+    print(f"  Reverse gateway connects to: ws://{args.host}:{args.port}/out")
+    
+    web.run_app(create_app(relay), host=args.host, port=args.port)
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file