diff --git a/app/fanout/bot.py b/app/fanout/bot.py
index 727453f..bb22412 100644
--- a/app/fanout/bot.py
+++ b/app/fanout/bot.py
@@ -136,6 +136,7 @@ class BotModule(FanoutModule):
         if path_value is None and paths and isinstance(paths, list) and len(paths) > 0:
             path_value = paths[0].get("path") if isinstance(paths[0], dict) else None
         path_bytes_per_hop = _derive_path_bytes_per_hop(paths, path_value)
+        packet_hash = data.get("packet_hash")
 
         # Wait for message to settle (allows retransmissions to be deduped)
         await asyncio.sleep(2)
@@ -161,6 +162,7 @@ class BotModule(FanoutModule):
                         path_value,
                         is_outgoing,
                         path_bytes_per_hop,
+                        packet_hash,
                     ),
                     timeout=BOT_EXECUTION_TIMEOUT,
                 )
diff --git a/app/fanout/bot_exec.py b/app/fanout/bot_exec.py
index 253cfed..878c66f 100644
--- a/app/fanout/bot_exec.py
+++ b/app/fanout/bot_exec.py
@@ -69,14 +69,14 @@ def _analyze_bot_signature(bot_func_or_sig) -> BotCallPlan:
     has_varargs = any(p.kind == inspect.Parameter.VAR_POSITIONAL for p in param_values)
     has_kwargs = any(p.kind == inspect.Parameter.VAR_KEYWORD for p in param_values)
     explicit_optional_names = tuple(
-        name for name in ("is_outgoing", "path_bytes_per_hop") if name in params
+        name for name in ("is_outgoing", "path_bytes_per_hop", "packet_hash") if name in params
     )
     unsupported_required_kwonly = [
         p.name
         for p in param_values
         if p.kind == inspect.Parameter.KEYWORD_ONLY
         and p.default is inspect.Parameter.empty
-        and p.name not in {"is_outgoing", "path_bytes_per_hop"}
+        and p.name not in {"is_outgoing", "path_bytes_per_hop", "packet_hash"}
     ]
     if unsupported_required_kwonly:
         raise ValueError(
@@ -102,6 +102,8 @@ def _analyze_bot_signature(bot_func_or_sig) -> BotCallPlan:
         keyword_args["is_outgoing"] = False
     if has_kwargs or "path_bytes_per_hop" in params:
         keyword_args["path_bytes_per_hop"] = 1
+    if has_kwargs or "packet_hash" in params:
+        keyword_args["packet_hash"] = ""
     candidate_specs.append(("keyword", [], keyword_args))
 
     if not has_kwargs and explicit_optional_names:
@@ -110,8 +112,12 @@ def _analyze_bot_signature(bot_func_or_sig) -> BotCallPlan:
             kwargs["is_outgoing"] = False
         if has_kwargs or "path_bytes_per_hop" in params:
             kwargs["path_bytes_per_hop"] = 1
+        if has_kwargs or "packet_hash" in params:
+            kwargs["packet_hash"] = ""
         candidate_specs.append(("mixed_keyword", base_args, kwargs))
 
+    if has_varargs or positional_capacity >= 11:
+        candidate_specs.append(("positional_11", base_args + [False, 1, ""], {}))
     if has_varargs or positional_capacity >= 10:
         candidate_specs.append(("positional_10", base_args + [False, 1], {}))
     if has_varargs or positional_capacity >= 9:
@@ -132,6 +138,7 @@ def _analyze_bot_signature(bot_func_or_sig) -> BotCallPlan:
         "Bot function signature is not supported. Use the default bot template as a reference. "
         "Supported trailing parameters are: path; path + is_outgoing; "
         "path + path_bytes_per_hop; path + is_outgoing + path_bytes_per_hop; "
+        "path + is_outgoing + path_bytes_per_hop + packet_hash; "
         "or use **kwargs for forward compatibility."
     )
 
@@ -148,12 +155,13 @@ def execute_bot_code(
     path: str | None,
     is_outgoing: bool = False,
     path_bytes_per_hop: int | None = None,
+    packet_hash: str | None = None,
 ) -> str | list[str] | None:
     """
     Execute user-provided bot code with message context.
 
     The code should define a function:
-    `bot(sender_name, sender_key, message_text, is_dm, channel_key, channel_name, sender_timestamp, path, is_outgoing, path_bytes_per_hop)`
+    `bot(sender_name, sender_key, message_text, is_dm, channel_key, channel_name, sender_timestamp, path, is_outgoing, path_bytes_per_hop, packet_hash)`
     or use named parameters / `**kwargs`.
     that returns either None (no response), a string (single response message),
     or a list of strings (multiple messages sent in order).
@@ -173,6 +181,7 @@ def execute_bot_code(
         path: Hex-encoded routing path (may be None)
         is_outgoing: True if this is our own outgoing message
         path_bytes_per_hop: Number of bytes per routing hop (1, 2, or 3), if known
+        packet_hash: MeshCore packet hash (first 16 hex chars of SHA256, uppercase), if known
 
     Returns:
         Response string, list of strings, or None.
@@ -208,7 +217,21 @@ def execute_bot_code(
 
     try:
         # Call the bot function with appropriate signature
-        if call_plan.call_style == "positional_10":
+        if call_plan.call_style == "positional_11":
+            result = bot_func(
+                sender_name,
+                sender_key,
+                message_text,
+                is_dm,
+                channel_key,
+                channel_name,
+                sender_timestamp,
+                path,
+                is_outgoing,
+                path_bytes_per_hop,
+                packet_hash,
+            )
+        elif call_plan.call_style == "positional_10":
             result = bot_func(
                 sender_name,
                 sender_key,
@@ -255,6 +278,8 @@ def execute_bot_code(
                 keyword_args["is_outgoing"] = is_outgoing
             if "path_bytes_per_hop" in call_plan.keyword_args:
                 keyword_args["path_bytes_per_hop"] = path_bytes_per_hop
+            if "packet_hash" in call_plan.keyword_args:
+                keyword_args["packet_hash"] = packet_hash
             result = bot_func(**keyword_args)
         else:
             result = bot_func(
diff --git a/app/fanout/community_mqtt.py b/app/fanout/community_mqtt.py
index 8407428..2e04f58 100644
--- a/app/fanout/community_mqtt.py
+++ b/app/fanout/community_mqtt.py
@@ -11,7 +11,6 @@ from __future__ import annotations
 
 import asyncio
 import base64
-import hashlib
 import json
 import logging
 import ssl
@@ -23,7 +22,7 @@ import aiomqtt
 
 from app.fanout.mqtt_base import BaseMqttPublisher
 from app.keystore import ed25519_sign_expanded
-from app.path_utils import parse_packet_envelope, split_path_hex
+from app.path_utils import calculate_packet_hash, parse_packet_envelope, split_path_hex
 from app.version_info import get_app_build_info
 
 logger = logging.getLogger(__name__)
@@ -110,34 +109,6 @@ def _generate_jwt_token(
     return f"{header_b64}.{payload_b64}.{signature.hex()}"
 
 
-def _calculate_packet_hash(raw_bytes: bytes) -> str:
-    """Calculate packet hash matching MeshCore's Packet::calculatePacketHash().
-
-    Parses the packet structure to extract payload type and payload data,
-    then hashes: payload_type(1 byte) [+ path_len(2 bytes LE) for TRACE] + payload_data.
-    Returns first 16 hex characters (uppercase).
-    """
-    if not raw_bytes:
-        return "0" * 16
-
-    try:
-        envelope = parse_packet_envelope(raw_bytes)
-        if envelope is None:
-            return "0" * 16
-
-        # Hash: payload_type(1 byte) [+ path_byte as uint16_t LE for TRACE] + payload_data
-        # IMPORTANT: TRACE hash uses the raw wire byte (not decoded hop count) to match firmware.
-        hash_obj = hashlib.sha256()
-        hash_obj.update(bytes([envelope.payload_type]))
-        if envelope.payload_type == 9:  # PAYLOAD_TYPE_TRACE
-            hash_obj.update(envelope.path_byte.to_bytes(2, byteorder="little"))
-        hash_obj.update(envelope.payload)
-
-        return hash_obj.hexdigest()[:16].upper()
-    except Exception:
-        return "0" * 16
-
-
 def _decode_packet_fields(raw_bytes: bytes) -> tuple[str, str, str, list[str], int | None]:
     """Decode packet fields used by the community uploader payload format.
 
@@ -192,7 +163,7 @@ def _format_raw_packet(data: dict[str, Any], device_name: str, public_key_hex: s
     snr: float | str = float(snr_val) if snr_val is not None else "Unknown"
     rssi: int | str = int(rssi_val) if rssi_val is not None else "Unknown"
 
-    packet_hash = _calculate_packet_hash(raw_bytes)
+    packet_hash = calculate_packet_hash(raw_bytes)
 
     packet = {
         "origin": device_name or "MeshCore Device",
diff --git a/app/packet_processor.py b/app/packet_processor.py
index 8c84d16..16dae31 100644
--- a/app/packet_processor.py
+++ b/app/packet_processor.py
@@ -35,6 +35,7 @@ from app.models import (
     RawPacketBroadcast,
     RawPacketDecryptedInfo,
 )
+from app.path_utils import calculate_packet_hash
 from app.repository import (
     ChannelRepository,
     ContactAdvertPathRepository,
@@ -73,6 +74,7 @@ async def create_message_from_decrypted(
     snr: float | None = None,
     channel_name: str | None = None,
     realtime: bool = True,
+    packet_hash: str | None = None,
 ) -> int | None:
     """Store a decrypted channel message via the shared message service."""
     return await _create_message_from_decrypted(
@@ -89,6 +91,7 @@ async def create_message_from_decrypted(
         channel_name=channel_name,
         realtime=realtime,
         broadcast_fn=broadcast_event,
+        packet_hash=packet_hash,
     )
 
 
@@ -104,6 +107,7 @@ async def create_dm_message_from_decrypted(
     snr: float | None = None,
     outgoing: bool = False,
     realtime: bool = True,
+    packet_hash: str | None = None,
 ) -> int | None:
     """Store a decrypted direct message via the shared message service."""
     return await _create_dm_message_from_decrypted(
@@ -119,6 +123,7 @@ async def create_dm_message_from_decrypted(
         outgoing=outgoing,
         realtime=realtime,
         broadcast_fn=broadcast_event,
+        packet_hash=packet_hash,
     )
 
 
@@ -323,13 +328,16 @@ async def process_raw_packet(
         "sender": None,
     }
 
+    # Compute packet hash once for threading into message broadcasts (used by bot fanout).
+    pkt_hash = calculate_packet_hash(raw_bytes)
+
     # Process packets based on payload type
     # For GROUP_TEXT, we always try to decrypt even for duplicate packets - the message
     # deduplication in create_message_from_decrypted handles adding paths to existing messages.
     # This is more reliable than trying to look up the message via raw packet linking.
     if payload_type == PayloadType.GROUP_TEXT:
         decrypt_result = await _process_group_text(
-            raw_bytes, packet_id, ts, packet_info, rssi=rssi, snr=snr
+            raw_bytes, packet_id, ts, packet_info, rssi=rssi, snr=snr, packet_hash=pkt_hash
         )
         if decrypt_result:
             result.update(decrypt_result)
@@ -342,7 +350,7 @@ async def process_raw_packet(
     elif payload_type == PayloadType.TEXT_MESSAGE:
         # Try to decrypt direct messages using stored private key and known contacts
         decrypt_result = await _process_direct_message(
-            raw_bytes, packet_id, ts, packet_info, rssi=rssi, snr=snr
+            raw_bytes, packet_id, ts, packet_info, rssi=rssi, snr=snr, packet_hash=pkt_hash
         )
         if decrypt_result:
             result.update(decrypt_result)
@@ -384,6 +392,7 @@ async def _process_group_text(
     packet_info: PacketInfo | None,
     rssi: int | None = None,
     snr: float | None = None,
+    packet_hash: str | None = None,
 ) -> dict | None:
     """
     Process a GroupText (channel message) packet.
@@ -422,6 +431,7 @@ async def _process_group_text(
             path_len=packet_info.path_length if packet_info else None,
             rssi=rssi,
             snr=snr,
+            packet_hash=packet_hash,
         )
 
         return {
@@ -567,6 +577,7 @@ async def _process_direct_message(
     packet_info: PacketInfo | None,
     rssi: int | None = None,
     snr: float | None = None,
+    packet_hash: str | None = None,
 ) -> dict | None:
     """
     Process a TEXT_MESSAGE (direct message) packet.
@@ -690,6 +701,7 @@ async def _process_direct_message(
                 rssi=rssi,
                 snr=snr,
                 outgoing=effective_outgoing,
+                packet_hash=packet_hash,
             )
 
             return {
diff --git a/app/path_utils.py b/app/path_utils.py
index 99b87f2..1996889 100644
--- a/app/path_utils.py
+++ b/app/path_utils.py
@@ -9,6 +9,7 @@ The path_len wire byte is packed as [hash_mode:2][hop_count:6]:
 Mode 3 (hash_size=4) is reserved and rejected.
 """
 
+import hashlib
 from collections.abc import Iterable
 from dataclasses import dataclass
 
@@ -289,3 +290,30 @@ def bucket_path_hash_widths(rows: Iterable) -> dict[str, int | float]:
         "double_byte_pct": (double_byte / total) * 100,
         "triple_byte_pct": (triple_byte / total) * 100,
     }
+
+
+def calculate_packet_hash(raw_bytes: bytes) -> str:
+    """Calculate packet hash matching MeshCore's Packet::calculatePacketHash().
+
+    Parses the packet structure to extract payload type and payload data,
+    then hashes: payload_type(1 byte) [+ path_len(2 bytes LE) for TRACE] + payload_data.
+    Returns first 16 hex characters (uppercase).
+    """
+    if not raw_bytes:
+        return "0" * 16
+
+    try:
+        envelope = parse_packet_envelope(raw_bytes)
+        if envelope is None:
+            return "0" * 16
+
+        hash_obj = hashlib.sha256()
+        hash_obj.update(bytes([envelope.payload_type]))
+        # TRACE hash uses the raw wire byte (not decoded hop count) to match firmware.
+        if envelope.payload_type == 9:  # PAYLOAD_TYPE_TRACE
+            hash_obj.update(envelope.path_byte.to_bytes(2, byteorder="little"))
+        hash_obj.update(envelope.payload)
+
+        return hash_obj.hexdigest()[:16].upper()
+    except Exception:
+        return "0" * 16
diff --git a/app/services/dm_ingest.py b/app/services/dm_ingest.py
index 4256801..318aafc 100644
--- a/app/services/dm_ingest.py
+++ b/app/services/dm_ingest.py
@@ -154,6 +154,7 @@ async def _store_direct_message(
     update_last_contacted_key: str | None,
     best_effort_content_dedup: bool,
     linked_packet_dedup: bool,
+    packet_hash: str | None = None,
     message_repository=MessageRepository,
     contact_repository=ContactRepository,
     raw_packet_repository=RawPacketRepository,
@@ -248,7 +249,9 @@ async def _store_direct_message(
             sender_name=sender_name,
             packet_id=packet_id,
         )
-        broadcast_message(message=message, broadcast_fn=broadcast_fn, realtime=realtime)
+        broadcast_message(
+            message=message, broadcast_fn=broadcast_fn, realtime=realtime, packet_hash=packet_hash
+        )
 
         if update_last_contacted_key:
             await contact_repository.update_last_contacted(update_last_contacted_key, received_at)
@@ -279,6 +282,7 @@ async def ingest_decrypted_direct_message(
     outgoing: bool = False,
     realtime: bool = True,
     broadcast_fn: BroadcastFn,
+    packet_hash: str | None = None,
     contact_repository=ContactRepository,
 ) -> Message | None:
     conversation_key = their_public_key.lower()
@@ -338,6 +342,7 @@ async def ingest_decrypted_direct_message(
         update_last_contacted_key=conversation_key,
         best_effort_content_dedup=outgoing,
         linked_packet_dedup=True,
+        packet_hash=packet_hash,
     )
     if message is None:
         return None
diff --git a/app/services/messages.py b/app/services/messages.py
index f6445b3..0f1d5f4 100644
--- a/app/services/messages.py
+++ b/app/services/messages.py
@@ -95,9 +95,12 @@ def broadcast_message(
     message: Message,
     broadcast_fn: BroadcastFn,
     realtime: bool | None = None,
+    packet_hash: str | None = None,
 ) -> None:
     """Broadcast a message payload, preserving the caller's broadcast signature."""
     payload = message.model_dump()
+    if packet_hash is not None:
+        payload["packet_hash"] = packet_hash
     if realtime is None:
         broadcast_fn("message", payload)
     else:
@@ -272,6 +275,7 @@ async def create_message_from_decrypted(
     channel_name: str | None = None,
     realtime: bool = True,
     broadcast_fn: BroadcastFn,
+    packet_hash: str | None = None,
 ) -> int | None:
     """Store and broadcast a decrypted channel message."""
     received = received_at or int(time.time())
@@ -340,6 +344,7 @@ async def create_message_from_decrypted(
         ),
         broadcast_fn=broadcast_fn,
         realtime=realtime,
+        packet_hash=packet_hash,
     )
 
     return msg_id
@@ -359,6 +364,7 @@ async def create_dm_message_from_decrypted(
     outgoing: bool = False,
     realtime: bool = True,
     broadcast_fn: BroadcastFn,
+    packet_hash: str | None = None,
 ) -> int | None:
     """Store and broadcast a decrypted direct message."""
     from app.services.dm_ingest import ingest_decrypted_direct_message
@@ -375,6 +381,7 @@ async def create_dm_message_from_decrypted(
         outgoing=outgoing,
         realtime=realtime,
         broadcast_fn=broadcast_fn,
+        packet_hash=packet_hash,
     )
     return message.id if message is not None else None
 
diff --git a/tests/test_community_mqtt.py b/tests/test_community_mqtt.py
index be3c72b..966bb20 100644
--- a/tests/test_community_mqtt.py
+++ b/tests/test_community_mqtt.py
@@ -17,7 +17,6 @@ from app.fanout.community_mqtt import (
     _base64url_encode,
     _build_radio_info,
     _build_status_topic,
-    _calculate_packet_hash,
     _decode_packet_fields,
     _format_raw_packet,
     _generate_jwt_token,
@@ -29,6 +28,7 @@ from app.fanout.mqtt_community import (
     _render_packet_topic,
 )
 from app.keystore import ed25519_sign_expanded
+from app.path_utils import calculate_packet_hash as _calculate_packet_hash
 
 
 def _make_test_keys() -> tuple[bytes, bytes]:
diff --git a/tests/test_fanout_hitlist.py b/tests/test_fanout_hitlist.py
index 640352b..722b047 100644
--- a/tests/test_fanout_hitlist.py
+++ b/tests/test_fanout_hitlist.py
@@ -37,6 +37,7 @@ class TestBotModuleParameterExtraction:
             path,
             is_outgoing,
             path_bytes_per_hop,
+            packet_hash,
         ):
             captured["is_outgoing"] = is_outgoing
             captured["is_dm"] = is_dm
@@ -86,6 +87,7 @@ class TestBotModuleParameterExtraction:
             path,
             is_outgoing,
             path_bytes_per_hop,
+            packet_hash,
         ):
             captured["is_outgoing"] = is_outgoing
             return None
@@ -132,6 +134,7 @@ class TestBotModuleParameterExtraction:
             path,
             is_outgoing,
             path_bytes_per_hop,
+            packet_hash,
         ):
             captured["path"] = path
             captured["path_bytes_per_hop"] = path_bytes_per_hop
@@ -180,6 +183,7 @@ class TestBotModuleParameterExtraction:
             path,
             is_outgoing,
             path_bytes_per_hop,
+            packet_hash,
         ):
             captured["message_text"] = message_text
             captured["sender_name"] = sender_name
@@ -228,6 +232,7 @@ class TestBotModuleParameterExtraction:
             path,
             is_outgoing,
             path_bytes_per_hop,
+            packet_hash,
         ):
             captured["channel_name"] = channel_name
             return None
@@ -275,6 +280,7 @@ class TestBotModuleParameterExtraction:
             path,
             is_outgoing,
             path_bytes_per_hop,
+            packet_hash,
         ):
             captured["sender_name"] = sender_name
             captured["sender_key"] = sender_key