diff --git a/src-async/BitLoggerAsync_test.mbt b/src-async/BitLoggerAsync_test.mbt
index 560a9b6..af321ce 100644
--- a/src-async/BitLoggerAsync_test.mbt
+++ b/src-async/BitLoggerAsync_test.mbt
@@ -2604,6 +2604,129 @@ async test "application async logger keeps broader async composition surface" {
   inspect(logger.last_error(), content="")
 }
 
+async test "application async logger log supports per-call target override" {
+  let written_target : Ref[String] = Ref("")
+  let written_message : Ref[String] = Ref("")
+  let written_fields : Ref[Array[@bitlogger.Field]] = Ref([])
+  let logger : ApplicationAsyncLogger = build_application_async_logger(
+    AsyncLoggerBuildConfig::new(
+      logger=@bitlogger.LoggerConfig::new(
+        min_level=@bitlogger.Level::Warn,
+        target="async.app.default",
+        sink=@bitlogger.SinkConfig::new(kind=@bitlogger.SinkKind::Console),
+      ),
+      async_config=AsyncLoggerConfig::new(max_pending=4),
+    ),
+  )
+    .with_context_fields([@bitlogger.field("service", "bitlogger")])
+    .with_patch(fn(rec) {
+      written_target.val = rec.target
+      written_message.val = rec.message
+      written_fields.val = rec.fields
+      rec
+    })
+
+  @async.with_task_group(group => {
+    group.spawn_bg(() => logger.run())
+    logger.log(
+      @bitlogger.Level::Error,
+      "override",
+      fields=[@bitlogger.field("mode", "test")],
+      target="async.app.override",
+    )
+    logger.shutdown()
+  })
+
+  inspect(written_target.val, content="async.app.override")
+  inspect(written_message.val, content="override")
+  inspect(written_fields.val.length(), content="2")
+  inspect(written_fields.val[0].key, content="service")
+  inspect(written_fields.val[0].value, content="bitlogger")
+  inspect(written_fields.val[1].key, content="mode")
+  inspect(written_fields.val[1].value, content="test")
+
+  let second_target : Ref[String] = Ref("")
+  let second_message : Ref[String] = Ref("")
+  let second_fields : Ref[Array[@bitlogger.Field]] = Ref([])
+  let second : ApplicationAsyncLogger = build_application_async_logger(
+    AsyncLoggerBuildConfig::new(
+      logger=@bitlogger.LoggerConfig::new(
+        min_level=@bitlogger.Level::Warn,
+        target="async.app.default",
+        sink=@bitlogger.SinkConfig::new(kind=@bitlogger.SinkKind::Console),
+      ),
+      async_config=AsyncLoggerConfig::new(max_pending=4),
+    ),
+  )
+    .with_context_fields([@bitlogger.field("service", "bitlogger")])
+    .with_patch(fn(rec) {
+      second_target.val = rec.target
+      second_message.val = rec.message
+      second_fields.val = rec.fields
+      rec
+    })
+
+  @async.with_task_group(group => {
+    group.spawn_bg(() => second.run())
+    second.log(@bitlogger.Level::Error, "default")
+    second.shutdown()
+  })
+
+  inspect(second_target.val, content="async.app.default")
+  inspect(second_message.val, content="default")
+  inspect(second_fields.val.length(), content="1")
+  inspect(second_fields.val[0].key, content="service")
+}
+
+async test "application async logger severity helpers use stored target without override" {
+  let written_levels : Ref[Array[String]] = Ref([])
+  let written_targets : Ref[Array[String]] = Ref([])
+  let written_fields : Ref[Array[Array[@bitlogger.Field]]] = Ref([])
+  let logger : ApplicationAsyncLogger = build_application_async_logger(
+    AsyncLoggerBuildConfig::new(
+      logger=@bitlogger.LoggerConfig::new(
+        min_level=@bitlogger.Level::Info,
+        target="async.app.helpers",
+        sink=@bitlogger.SinkConfig::new(kind=@bitlogger.SinkKind::Console),
+      ),
+      async_config=AsyncLoggerConfig::new(max_pending=4),
+    ),
+  )
+    .with_context_fields([@bitlogger.field("service", "bitlogger")])
+    .with_patch(fn(rec) {
+      written_levels.val.push(rec.level.label())
+      written_targets.val.push(rec.target)
+      written_fields.val.push(rec.fields)
+      rec
+    })
+
+  @async.with_task_group(group => {
+    group.spawn_bg(() => logger.run())
+    logger.info("info", fields=[@bitlogger.field("mode", "info")])
+    logger.warn("warn", fields=[@bitlogger.field("mode", "warn")])
+    logger.error("error", fields=[@bitlogger.field("mode", "error")])
+    logger.shutdown()
+  })
+
+  inspect(written_levels.val.length(), content="3")
+  inspect(written_levels.val[0], content="INFO")
+  inspect(written_levels.val[1], content="WARN")
+  inspect(written_levels.val[2], content="ERROR")
+  inspect(written_targets.val.length(), content="3")
+  inspect(written_targets.val[0], content="async.app.helpers")
+  inspect(written_targets.val[1], content="async.app.helpers")
+  inspect(written_targets.val[2], content="async.app.helpers")
+  inspect(written_fields.val[0].length(), content="2")
+  inspect(written_fields.val[1].length(), content="2")
+  inspect(written_fields.val[2].length(), content="2")
+  inspect(written_fields.val[0][0].key, content="service")
+  inspect(written_fields.val[0][1].value, content="info")
+  inspect(written_fields.val[1][0].key, content="service")
+  inspect(written_fields.val[1][1].value, content="warn")
+  inspect(written_fields.val[2][0].key, content="service")
+  inspect(written_fields.val[2][1].value, content="error")
+}
+
 test "application async logger builder preserves sync queue-backed runtime sink" {
   let logger = build_application_async_logger(
     AsyncLoggerBuildConfig::new(
@@ -2829,6 +2952,129 @@ async test "application text async logger keeps broader async composition surfac
   inspect(logger.last_error(), content="")
 }
 
+async test "application text async logger log supports per-call target override" {
+  let written_target : Ref[String] = Ref("")
+  let written_message : Ref[String] = Ref("")
+  let written_fields : Ref[Array[@bitlogger.Field]] = Ref([])
+  let logger : ApplicationTextAsyncLogger = build_application_text_async_logger(
+    AsyncLoggerBuildConfig::new(
+      logger=@bitlogger.text_console(
+        min_level=@bitlogger.Level::Warn,
+        target="async.app.text.default",
+        text_formatter=@bitlogger.TextFormatterConfig::new(show_timestamp=false, separator=" | "),
+      ),
+      async_config=AsyncLoggerConfig::new(max_pending=4),
+    ),
+  )
+    .with_context_fields([@bitlogger.field("service", "bitlogger")])
+    .with_patch(fn(rec) {
+    written_target.val = rec.target
+    written_message.val = rec.message
+    written_fields.val = rec.fields
+    rec
+  })
+
+  @async.with_task_group(group => {
+    group.spawn_bg(() => logger.run())
+    logger.log(
+      @bitlogger.Level::Error,
+      "override",
+      fields=[@bitlogger.field("mode", "test")],
+      target="async.app.text.override",
+    )
+    logger.shutdown()
+  })
+
+  inspect(written_target.val, content="async.app.text.override")
+  inspect(written_message.val, content="override")
+  inspect(written_fields.val.length(), content="2")
+  inspect(written_fields.val[0].key, content="service")
+  inspect(written_fields.val[0].value, content="bitlogger")
+  inspect(written_fields.val[1].key, content="mode")
+  inspect(written_fields.val[1].value, content="test")
+
+  let second_target : Ref[String] = Ref("")
+  let second_message : Ref[String] = Ref("")
+  let second_fields : Ref[Array[@bitlogger.Field]] = Ref([])
+  let second : ApplicationTextAsyncLogger = build_application_text_async_logger(
+    AsyncLoggerBuildConfig::new(
+      logger=@bitlogger.text_console(
+        min_level=@bitlogger.Level::Warn,
+        target="async.app.text.default",
+        text_formatter=@bitlogger.TextFormatterConfig::new(show_timestamp=false, separator=" | "),
+      ),
+      async_config=AsyncLoggerConfig::new(max_pending=4),
+    ),
+  )
+    .with_context_fields([@bitlogger.field("service", "bitlogger")])
+    .with_patch(fn(rec) {
+    second_target.val = rec.target
+    second_message.val = rec.message
+    second_fields.val = rec.fields
+    rec
+  })
+
+  @async.with_task_group(group => {
+    group.spawn_bg(() => second.run())
+    second.log(@bitlogger.Level::Error, "default")
+    second.shutdown()
+  })
+
+  inspect(second_target.val, content="async.app.text.default")
+  inspect(second_message.val, content="default")
+  inspect(second_fields.val.length(), content="1")
+  inspect(second_fields.val[0].key, content="service")
+}
+
+async test "application text async logger severity helpers use stored target without override" {
+  let written_levels : Ref[Array[String]] = Ref([])
+  let written_targets : Ref[Array[String]] = Ref([])
+  let written_fields : Ref[Array[Array[@bitlogger.Field]]] = Ref([])
+  let logger : ApplicationTextAsyncLogger = build_application_text_async_logger(
+    AsyncLoggerBuildConfig::new(
+      logger=@bitlogger.text_console(
+        min_level=@bitlogger.Level::Info,
+        target="async.app.text.helpers",
+        text_formatter=@bitlogger.TextFormatterConfig::new(show_timestamp=false, separator=" | "),
+      ),
+      async_config=AsyncLoggerConfig::new(max_pending=4),
+    ),
+  )
+    .with_context_fields([@bitlogger.field("service", "bitlogger")])
+    .with_patch(fn(rec) {
+    written_levels.val.push(rec.level.label())
+    written_targets.val.push(rec.target)
+    written_fields.val.push(rec.fields)
+    rec
+  })
+
+  @async.with_task_group(group => {
+    group.spawn_bg(() => logger.run())
+    logger.info("info", fields=[@bitlogger.field("mode", "info")])
+    logger.warn("warn", fields=[@bitlogger.field("mode", "warn")])
+    logger.error("error", fields=[@bitlogger.field("mode", "error")])
+    logger.shutdown()
+  })
+
+  inspect(written_levels.val.length(), content="3")
+  inspect(written_levels.val[0], content="INFO")
+  inspect(written_levels.val[1], content="WARN")
+  inspect(written_levels.val[2], content="ERROR")
+  inspect(written_targets.val.length(), content="3")
+  inspect(written_targets.val[0], content="async.app.text.helpers")
+  inspect(written_targets.val[1], content="async.app.text.helpers")
+  inspect(written_targets.val[2], content="async.app.text.helpers")
+  inspect(written_fields.val[0].length(), content="2")
+  inspect(written_fields.val[1].length(), content="2")
+  inspect(written_fields.val[2].length(), content="2")
+  inspect(written_fields.val[0][0].key, content="service")
+  inspect(written_fields.val[0][1].value, content="info")
+  inspect(written_fields.val[1][0].key, content="service")
+  inspect(written_fields.val[1][1].value, content="warn")
+  inspect(written_fields.val[2][0].key, content="service")
+  inspect(written_fields.val[2][1].value, content="error")
+}
+
 test "application text async logger builder ignores sync queue layer" {
   let logger = build_application_text_async_logger(
     AsyncLoggerBuildConfig::new(