diff --git a/src/compile/ir/tasks/mod.rs b/src/compile/ir/tasks/mod.rs
index a19fdec6..7fb00daf 100644
--- a/src/compile/ir/tasks/mod.rs
+++ b/src/compile/ir/tasks/mod.rs
@@ -31,5 +31,6 @@ pub mod extract_files;
 pub mod npm;
 pub mod nuget_command;
 pub mod powershell;
+pub mod publish_build_artifacts;
 pub mod publish_pipeline_artifact;
 pub mod publish_test_results;
diff --git a/src/compile/ir/tasks/publish_build_artifacts.rs b/src/compile/ir/tasks/publish_build_artifacts.rs
new file mode 100644
index 00000000..becd3a43
--- /dev/null
+++ b/src/compile/ir/tasks/publish_build_artifacts.rs
@@ -0,0 +1,251 @@
+//! Typed builder for `PublishBuildArtifacts@1`.
+//!
+//! This is a location-dispatch task: the `publishLocation` input (`Container`
+//! or `FilePath`) determines which optional inputs are meaningful. Because
+//! file-share-only inputs (`TargetPath`, `Parallel`, `ParallelCount`,
+//! `FileCopyOptions`) live inside [`FilePathLocation`], applying them when
+//! `publishLocation` is `Container` is unrepresentable.
+//!
+//! ADO task reference:
+//! <https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/publish-build-artifacts-v1>
+
+use super::common::{push_bool, push_opt};
+use crate::compile::ir::step::TaskStep;
+
+/// `PublishBuildArtifacts@1` `publishLocation` selector, carrying
+/// per-location optional inputs.
+#[derive(Debug, Clone)]
+pub enum PublishLocation {
+    /// Publish to Azure Pipelines artifact storage (default).
+    Container,
+    /// Publish to a file share; carries file-share-specific optionals.
+    FilePath(FilePathLocation),
+}
+
+/// Per-location optionals for `publishLocation: FilePath`.
+#[derive(Debug, Clone)]
+pub struct FilePathLocation {
+    /// `TargetPath` — UNC file share path. Required for the `FilePath` location.
+    target_path: String,
+    /// `Parallel` — copy files in parallel using multiple threads.
+    parallel: Option<bool>,
+    /// `ParallelCount` — number of threads for parallel copy (1–128, default 8).
+    parallel_count: Option<String>,
+    /// `FileCopyOptions` — additional robocopy arguments.
+    file_copy_options: Option<String>,
+}
+
+impl FilePathLocation {
+    /// Required: `TargetPath` — UNC path to the file share.
+    pub fn new(target_path: impl Into<String>) -> Self {
+        Self {
+            target_path: target_path.into(),
+            parallel: None,
+            parallel_count: None,
+            file_copy_options: None,
+        }
+    }
+
+    /// `Parallel` — enable parallel copy.
+    pub fn parallel(mut self, value: bool) -> Self {
+        self.parallel = Some(value);
+        self
+    }
+
+    /// `ParallelCount` — thread count for parallel copy (`"1"` – `"128"`, default `"8"`).
+    pub fn parallel_count(mut self, value: impl Into<String>) -> Self {
+        self.parallel_count = Some(value.into());
+        self
+    }
+
+    /// `FileCopyOptions` — additional robocopy-style options.
+    pub fn file_copy_options(mut self, value: impl Into<String>) -> Self {
+        self.file_copy_options = Some(value.into());
+        self
+    }
+}
+
+/// Builder for a [`TaskStep`] invoking `PublishBuildArtifacts@1`.
+///
+/// Use [`PublishBuildArtifacts::container`] to publish to Azure Pipelines
+/// artifact storage and [`PublishBuildArtifacts::file_path`] to publish to a
+/// file share. Shared optionals (`max_artifact_size`, `store_as_tar`) are
+/// available on both.
+///
+/// ADO task reference:
+/// <https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/publish-build-artifacts-v1>
+#[derive(Debug, Clone)]
+pub struct PublishBuildArtifacts {
+    path_to_publish: String,
+    artifact_name: String,
+    location: PublishLocation,
+    /// `MaxArtifactSize` — artifact size limit in bytes; `"0"` disables the limit.
+    max_artifact_size: Option<String>,
+    /// `StoreAsTar` — tar the artifact directory before uploading.
+    store_as_tar: Option<bool>,
+    display_name: Option<String>,
+}
+
+impl PublishBuildArtifacts {
+    /// Construct from an explicit [`PublishLocation`].
+    pub fn new(
+        path_to_publish: impl Into<String>,
+        artifact_name: impl Into<String>,
+        location: PublishLocation,
+    ) -> Self {
+        Self {
+            path_to_publish: path_to_publish.into(),
+            artifact_name: artifact_name.into(),
+            location,
+            max_artifact_size: None,
+            store_as_tar: None,
+            display_name: None,
+        }
+    }
+
+    /// `publishLocation: Container` — publish to Azure Pipelines artifact storage.
+    pub fn container(
+        path_to_publish: impl Into<String>,
+        artifact_name: impl Into<String>,
+    ) -> Self {
+        Self::new(path_to_publish, artifact_name, PublishLocation::Container)
+    }
+
+    /// `publishLocation: FilePath` — publish to a file share.
+    pub fn file_path(
+        path_to_publish: impl Into<String>,
+        artifact_name: impl Into<String>,
+        location: FilePathLocation,
+    ) -> Self {
+        Self::new(path_to_publish, artifact_name, PublishLocation::FilePath(location))
+    }
+
+    /// `MaxArtifactSize` — maximum artifact size in bytes; `"0"` means no limit.
+    pub fn max_artifact_size(mut self, value: impl Into<String>) -> Self {
+        self.max_artifact_size = Some(value.into());
+        self
+    }
+
+    /// `StoreAsTar` — tar the artifact directory before uploading.
+    pub fn store_as_tar(mut self, value: bool) -> Self {
+        self.store_as_tar = Some(value);
+        self
+    }
+
+    /// Override the default `displayName` (`"Publish Artifact"`).
+    pub fn with_display_name(mut self, value: impl Into<String>) -> Self {
+        self.display_name = Some(value.into());
+        self
+    }
+
+    /// Lower into a [`TaskStep`].
+    pub fn into_step(self) -> TaskStep {
+        let mut t = TaskStep::new(
+            "PublishBuildArtifacts@1",
+            self.display_name.unwrap_or_else(|| "Publish Artifact".into()),
+        )
+        .with_input("PathtoPublish", self.path_to_publish)
+        .with_input("ArtifactName", self.artifact_name);
+
+        match self.location {
+            PublishLocation::Container => {
+                t = t.with_input("publishLocation", "Container");
+            }
+            PublishLocation::FilePath(loc) => {
+                t = t
+                    .with_input("publishLocation", "FilePath")
+                    .with_input("TargetPath", loc.target_path);
+                push_bool(&mut t, "Parallel", loc.parallel);
+                push_opt(&mut t, "ParallelCount", loc.parallel_count);
+                push_opt(&mut t, "FileCopyOptions", loc.file_copy_options);
+            }
+        }
+
+        push_opt(&mut t, "MaxArtifactSize", self.max_artifact_size);
+        push_bool(&mut t, "StoreAsTar", self.store_as_tar);
+        t
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn container_defaults() {
+        let t = PublishBuildArtifacts::container(
+            "$(Build.ArtifactStagingDirectory)",
+            "drop",
+        )
+        .into_step();
+        assert_eq!(t.task, "PublishBuildArtifacts@1");
+        assert_eq!(t.display_name, "Publish Artifact");
+        assert_eq!(
+            t.inputs.get("PathtoPublish").map(String::as_str),
+            Some("$(Build.ArtifactStagingDirectory)")
+        );
+        assert_eq!(t.inputs.get("ArtifactName").map(String::as_str), Some("drop"));
+        assert_eq!(t.inputs.get("publishLocation").map(String::as_str), Some("Container"));
+        assert!(t.inputs.get("TargetPath").is_none());
+    }
+
+    #[test]
+    fn container_with_shared_optionals() {
+        let t = PublishBuildArtifacts::container("$(Build.ArtifactStagingDirectory)", "binaries")
+            .max_artifact_size("1073741824")
+            .store_as_tar(true)
+            .with_display_name("Publish build binaries")
+            .into_step();
+        assert_eq!(t.display_name, "Publish build binaries");
+        assert_eq!(
+            t.inputs.get("MaxArtifactSize").map(String::as_str),
+            Some("1073741824")
+        );
+        assert_eq!(t.inputs.get("StoreAsTar").map(String::as_str), Some("true"));
+    }
+
+    #[test]
+    fn file_path_with_location_optionals() {
+        let t = PublishBuildArtifacts::file_path(
+            "$(Build.ArtifactStagingDirectory)",
+            "drop",
+            FilePathLocation::new(r"\\myshare\builds")
+                .parallel(true)
+                .parallel_count("16")
+                .file_copy_options("/MIR"),
+        )
+        .into_step();
+        assert_eq!(t.inputs.get("publishLocation").map(String::as_str), Some("FilePath"));
+        assert_eq!(
+            t.inputs.get("TargetPath").map(String::as_str),
+            Some(r"\\myshare\builds")
+        );
+        assert_eq!(t.inputs.get("Parallel").map(String::as_str), Some("true"));
+        assert_eq!(t.inputs.get("ParallelCount").map(String::as_str), Some("16"));
+        assert_eq!(t.inputs.get("FileCopyOptions").map(String::as_str), Some("/MIR"));
+    }
+
+    #[test]
+    fn file_path_omits_absent_optionals() {
+        let t = PublishBuildArtifacts::file_path(
+            "$(Build.ArtifactStagingDirectory)",
+            "drop",
+            FilePathLocation::new(r"\\myshare\builds"),
+        )
+        .into_step();
+        assert_eq!(t.inputs.get("publishLocation").map(String::as_str), Some("FilePath"));
+        assert!(t.inputs.get("Parallel").is_none());
+        assert!(t.inputs.get("ParallelCount").is_none());
+        assert!(t.inputs.get("FileCopyOptions").is_none());
+        assert!(t.inputs.get("MaxArtifactSize").is_none());
+        assert!(t.inputs.get("StoreAsTar").is_none());
+    }
+
+    #[test]
+    fn display_name_override() {
+        let t = PublishBuildArtifacts::container("out/", "my-artifact")
+            .with_display_name("Stage and publish")
+            .into_step();
+        assert_eq!(t.display_name, "Stage and publish");
+    }
+}