diff --git a/.gitignore b/.gitignore
index ab1f938..0b392bf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,11 +1,9 @@
 .DS_Store
-tests/test_reliability
-tests/bloom
 nph
 docs
 for_reference
 do_not_commit
-build/*
+/build/
 result
 sds.nims
 /.update.timestamp
diff --git a/sds.nim b/sds.nim
index 2e16c74..1f11dd1 100644
--- a/sds.nim
+++ b/sds.nim
@@ -85,7 +85,9 @@ proc wrapOutgoingMessage*(
     message: seq[byte],
     messageId: SdsMessageID,
     channelId: SdsChannelID,
-): Future[Result[seq[byte], ReliabilityError]] {.async: (raises: []), gcsafe.} =
+): Future[Result[seq[byte], ReliabilityError]] {.
+    async: (raises: [CancelledError]), gcsafe
+.} =
   ## Wraps an outgoing message with reliability metadata.
   if message.len == 0:
     return err(ReliabilityError.reInvalidArgument)
@@ -156,6 +158,8 @@ proc wrapOutgoingMessage*(
         return err(ReliabilityError.reSerializationError)
     finally:
       rm.lock.release()
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Failed to wrap message (lock)",
       channelId = channelId, msg = getCurrentExceptionMsg()
@@ -219,7 +223,7 @@ proc unwrapReceivedMessage*(
 ): Future[Result[
     tuple[message: seq[byte], missingDeps: seq[HistoryEntry], channelId: SdsChannelID],
     ReliabilityError,
-]] {.async: (raises: []), gcsafe.} =
+]] {.async: (raises: [CancelledError]), gcsafe.} =
   ## Unwraps a received message and processes its reliability metadata.
   try:
     let channelId = extractChannelId(message).valueOr:
@@ -330,13 +334,15 @@ proc unwrapReceivedMessage*(
             await rm.persistence.saveOutgoingRepair(channelId, dep.messageId, outEntry)
 
     return ok((msg.content, missingDeps, channelId))
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Failed to unwrap message", msg = getCurrentExceptionMsg()
     return err(ReliabilityError.reDeserializationError)
 
 proc markDependenciesMet*(
     rm: ReliabilityManager, messageIds: seq[SdsMessageID], channelId: SdsChannelID
-): Future[Result[void, ReliabilityError]] {.async: (raises: []), gcsafe.} =
+): Future[Result[void, ReliabilityError]] {.async: (raises: [CancelledError]), gcsafe.} =
   ## Marks the specified message dependencies as met.
   try:
     if channelId notin rm.channels:
@@ -364,6 +370,8 @@ proc markDependenciesMet*(
 
     await rm.processIncomingBuffer(channelId)
     return ok()
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Failed to mark dependencies as met",
       channelId = channelId, msg = getCurrentExceptionMsg()
@@ -377,7 +385,7 @@ proc setCallbacks*(
     onPeriodicSync: PeriodicSyncCallback = nil,
     onRetrievalHint: RetrievalHintProvider = nil,
     onRepairReady: RepairReadyCallback = nil,
-): Future[void] {.async: (raises: []), gcsafe.} =
+): Future[void] {.async: (raises: [CancelledError]), gcsafe.} =
   ## Sets the callback functions for various events in the ReliabilityManager.
   try:
     await rm.lock.acquire()
@@ -390,12 +398,14 @@ proc setCallbacks*(
       rm.onRepairReady = onRepairReady
     finally:
       rm.lock.release()
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Failed to set callbacks", msg = getCurrentExceptionMsg()
 
 proc checkUnacknowledgedMessages(
     rm: ReliabilityManager, channelId: SdsChannelID
-): Future[void] {.async: (raises: []), gcsafe.} =
+): Future[void] {.async: (raises: [CancelledError]), gcsafe.} =
   try:
     await rm.lock.acquire()
     try:
@@ -427,6 +437,8 @@ proc checkUnacknowledgedMessages(
       channel.outgoingBuffer = newOutgoingBuffer
     finally:
       rm.lock.release()
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Failed to check unacknowledged messages",
       channelId = channelId, msg = getCurrentExceptionMsg()
@@ -460,7 +472,7 @@ proc periodicSyncMessage(
 
 proc runRepairSweep*(
     rm: ReliabilityManager
-): Future[void] {.async: (raises: []), gcsafe.} =
+): Future[void] {.async: (raises: [CancelledError]), gcsafe.} =
   ## SDS-R: Runs a single pass of the repair sweep.
   ## - Incoming: fires onRepairReady for expired T_resp entries and removes them
   ## - Outgoing: drops entries past T_max window
@@ -501,6 +513,8 @@ proc runRepairSweep*(
             channelId = channelId, msg = getCurrentExceptionMsg()
     finally:
       rm.lock.release()
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Error in repair sweep", msg = getCurrentExceptionMsg()
 
@@ -523,7 +537,7 @@ proc startPeriodicTasks*(rm: ReliabilityManager) =
 
 proc resetReliabilityManager*(
     rm: ReliabilityManager
-): Future[Result[void, ReliabilityError]] {.async: (raises: []), gcsafe.} =
+): Future[Result[void, ReliabilityError]] {.async: (raises: [CancelledError]), gcsafe.} =
   ## Resets the ReliabilityManager to its initial state.
   try:
     await rm.lock.acquire()
@@ -547,6 +561,8 @@ proc resetReliabilityManager*(
         return err(ReliabilityError.reInternalError)
     finally:
       rm.lock.release()
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Failed to reset ReliabilityManager (lock)", msg = getCurrentExceptionMsg()
     return err(ReliabilityError.reInternalError)
diff --git a/sds.nimble b/sds.nimble
index a3c75b3..6139576 100644
--- a/sds.nimble
+++ b/sds.nimble
@@ -65,9 +65,9 @@ proc getMyCpu(): string =
 
 # Tasks
 task test, "Run the test suite":
-  exec "nim c -r tests/test_bloom.nim"
-  exec "nim c -r tests/test_reliability.nim"
-  exec "nim c -r tests/test_persistence.nim"
+  exec "nim c -r --outdir:build tests/test_bloom.nim"
+  exec "nim c -r --outdir:build tests/test_reliability.nim"
+  exec "nim c -r --outdir:build tests/test_persistence.nim"
 
 task libsdsDynamicWindows, "Generate bindings":
   let outLibNameAndExt = "libsds.dll"
diff --git a/sds/sds_utils.nim b/sds/sds_utils.nim
index 0e3a07d..38de29e 100644
--- a/sds/sds_utils.nim
+++ b/sds/sds_utils.nim
@@ -56,7 +56,7 @@ proc cleanup*(
 
 proc cleanBloomFilter*(
     rm: ReliabilityManager, channelId: SdsChannelID
-): Future[void] {.async: (raises: []), gcsafe.} =
+): Future[void] {.async: (raises: [CancelledError]), gcsafe.} =
   try:
     await rm.lock.acquire()
     try:
@@ -64,6 +64,8 @@ proc cleanBloomFilter*(
         rm.channels[channelId].bloomFilter.clean()
     finally:
       rm.lock.release()
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Failed to clean bloom filter",
       error = getCurrentExceptionMsg(), channelId = channelId
@@ -215,7 +217,7 @@ proc checkDependencies*(
 
 proc getMessageHistory*(
     rm: ReliabilityManager, channelId: SdsChannelID
-): Future[seq[SdsMessageID]] {.async: (raises: []), gcsafe.} =
+): Future[seq[SdsMessageID]] {.async: (raises: [CancelledError]), gcsafe.} =
   try:
     await rm.lock.acquire()
     try:
@@ -228,6 +230,8 @@ proc getMessageHistory*(
         return @[]
     finally:
       rm.lock.release()
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Failed to get message history",
       channelId = channelId, error = getCurrentExceptionMsg()
@@ -235,7 +239,7 @@ proc getMessageHistory*(
 
 proc getOutgoingBuffer*(
     rm: ReliabilityManager, channelId: SdsChannelID
-): Future[seq[UnacknowledgedMessage]] {.async: (raises: []), gcsafe.} =
+): Future[seq[UnacknowledgedMessage]] {.async: (raises: [CancelledError]), gcsafe.} =
   try:
     await rm.lock.acquire()
     try:
@@ -245,6 +249,8 @@ proc getOutgoingBuffer*(
         return @[]
     finally:
       rm.lock.release()
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Failed to get outgoing buffer",
       channelId = channelId, error = getCurrentExceptionMsg()
@@ -252,7 +258,9 @@ proc getOutgoingBuffer*(
 
 proc getIncomingBuffer*(
     rm: ReliabilityManager, channelId: SdsChannelID
-): Future[Table[SdsMessageID, IncomingMessage]] {.async: (raises: []), gcsafe.} =
+): Future[Table[SdsMessageID, IncomingMessage]] {.
+    async: (raises: [CancelledError]), gcsafe
+.} =
   try:
     await rm.lock.acquire()
     try:
@@ -262,6 +270,8 @@ proc getIncomingBuffer*(
         return initTable[SdsMessageID, IncomingMessage]()
     finally:
       rm.lock.release()
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Failed to get incoming buffer",
       channelId = channelId, error = getCurrentExceptionMsg()
@@ -301,19 +311,23 @@ proc getOrCreateChannel*(
 
 proc ensureChannel*(
     rm: ReliabilityManager, channelId: SdsChannelID
-): Future[Result[void, ReliabilityError]] {.async: (raises: []), gcsafe.} =
+): Future[Result[void, ReliabilityError]] {.async: (raises: [CancelledError]), gcsafe.} =
   try:
     await rm.lock.acquire()
     try:
       try:
         discard await rm.getOrCreateChannel(channelId)
         return ok()
+      except CancelledError as e:
+        raise e
       except CatchableError:
         error "Failed to ensure channel",
           channelId = channelId, msg = getCurrentExceptionMsg()
         return err(ReliabilityError.reInternalError)
     finally:
       rm.lock.release()
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Failed to ensure channel (lock)",
       channelId = channelId, msg = getCurrentExceptionMsg()
@@ -321,7 +335,7 @@ proc ensureChannel*(
 
 proc removeChannel*(
     rm: ReliabilityManager, channelId: SdsChannelID
-): Future[Result[void, ReliabilityError]] {.async: (raises: []), gcsafe.} =
+): Future[Result[void, ReliabilityError]] {.async: (raises: [CancelledError]), gcsafe.} =
   try:
     await rm.lock.acquire()
     try:
@@ -342,6 +356,8 @@ proc removeChannel*(
         return err(ReliabilityError.reInternalError)
     finally:
       rm.lock.release()
+  except CancelledError as e:
+    raise e
   except CatchableError:
     error "Failed to remove channel (lock)",
       channelId = channelId, msg = getCurrentExceptionMsg()
diff --git a/tests/test_bloom b/tests/test_bloom
deleted file mode 100755
index ed43b69..0000000
Binary files a/tests/test_bloom and /dev/null differ
diff --git a/tests/test_persistence b/tests/test_persistence
deleted file mode 100755
index 69d512c..0000000
Binary files a/tests/test_persistence and /dev/null differ
diff --git a/tests/test_reliability.nim b/tests/test_reliability.nim
index c81abdd..20b7022 100644
--- a/tests/test_reliability.nim
+++ b/tests/test_reliability.nim
@@ -1667,7 +1667,7 @@ proc deliverExcept(
     senderId: SdsParticipantID,
     bytes: seq[byte],
     exclude: seq[SdsParticipantID],
-): Future[void] {.async: (raises: []), gcsafe.} =
+): Future[void] {.async: (raises: [CancelledError]), gcsafe.} =
   for pid, peer in bus.peers:
     if pid == senderId or pid in exclude:
       continue