Publish stable DotSlash assets for argument-comment lint

## Summary
- detect custom prompts in `$CODEX_HOME/prompts` during TUI startup
- show a deprecation notice only when prompts are present, with guidance
to use `$skill-creator`
- add TUI tests and snapshot coverage for present, missing, and empty
prompts directories

## Testing
- Manually tested

.github/dotslash-argument-comment-lint-config.json

@@ -0,0 +1,24 @@
+{
+  "outputs": {
+    "argument-comment-lint": {
+      "platforms": {
+        "macos-aarch64": {
+          "regex": "^libargument_comment_lint@nightly-2025-09-18-aarch64-apple-darwin\\.dylib\\.zst$",
+          "path": "libargument_comment_lint@nightly-2025-09-18-aarch64-apple-darwin.dylib"
+        },
+        "linux-x86_64": {
+          "regex": "^libargument_comment_lint@nightly-2025-09-18-x86_64-unknown-linux-gnu\\.so\\.zst$",
+          "path": "libargument_comment_lint@nightly-2025-09-18-x86_64-unknown-linux-gnu.so"
+        },
+        "linux-aarch64": {
+          "regex": "^libargument_comment_lint@nightly-2025-09-18-aarch64-unknown-linux-gnu\\.so\\.zst$",
+          "path": "libargument_comment_lint@nightly-2025-09-18-aarch64-unknown-linux-gnu.so"
+        },
+        "windows-x86_64": {
+          "regex": "^argument_comment_lint@nightly-2025-09-18-x86_64-pc-windows-msvc\\.dll\\.zst$",
+          "path": "argument_comment_lint@nightly-2025-09-18-x86_64-pc-windows-msvc.dll"
+        }
+      }
+    }
+  }
+}

.github/workflows/rust-release-argument-comment-lint.yml

@@ -0,0 +1,88 @@
+name: rust-release-argument-comment-lint
+
+on:
+  workflow_call:
+    inputs:
+      publish:
+        required: true
+        type: boolean
+
+jobs:
+  skip:
+    if: ${{ !inputs.publish }}
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "Skipping argument-comment-lint release assets for prerelease tag"
+
+  build:
+    if: ${{ inputs.publish }}
+    name: Build - ${{ matrix.runner }} - ${{ matrix.target }}
+    runs-on: ${{ matrix.runs_on || matrix.runner }}
+    timeout-minutes: 60
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - runner: macos-15-xlarge
+            target: aarch64-apple-darwin
+            lib_name: libargument_comment_lint@nightly-2025-09-18-aarch64-apple-darwin.dylib
+          - runner: ubuntu-24.04
+            target: x86_64-unknown-linux-gnu
+            lib_name: libargument_comment_lint@nightly-2025-09-18-x86_64-unknown-linux-gnu.so
+          - runner: ubuntu-24.04-arm
+            target: aarch64-unknown-linux-gnu
+            lib_name: libargument_comment_lint@nightly-2025-09-18-aarch64-unknown-linux-gnu.so
+          - runner: windows-x64
+            target: x86_64-pc-windows-msvc
+            lib_name: argument_comment_lint@nightly-2025-09-18-x86_64-pc-windows-msvc.dll
+            runs_on:
+              group: codex-runners
+              labels: codex-windows-x64
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: dtolnay/rust-toolchain@1.93.0
+        with:
+          toolchain: nightly-2025-09-18
+          targets: ${{ matrix.target }}
+          components: llvm-tools-preview, rustc-dev, rust-src
+
+      - name: Install dylint-link
+        shell: bash
+        run: cargo install --locked dylint-link
+
+      - name: Cargo build
+        working-directory: tools/argument-comment-lint
+        shell: bash
+        run: cargo build --release --target ${{ matrix.target }}
+
+      - if: ${{ runner.os == 'Windows' }}
+        name: Install DotSlash
+        uses: facebook/install-dotslash@v2
+
+      - name: Stage artifact
+        shell: bash
+        run: |
+          dest="dist/argument-comment-lint/${{ matrix.target }}"
+          mkdir -p "$dest"
+          cp "tools/argument-comment-lint/target/${{ matrix.target }}/release/${{ matrix.lib_name }}" \
+            "$dest/${{ matrix.lib_name }}"
+
+      - if: ${{ runner.os != 'Windows' }}
+        name: Compress artifact
+        shell: bash
+        run: |
+          zstd -T0 -19 --rm "dist/argument-comment-lint/${{ matrix.target }}/${{ matrix.lib_name }}"
+
+      - if: ${{ runner.os == 'Windows' }}
+        name: Compress artifact
+        shell: bash
+        run: |
+          ./.github/workflows/zstd -T0 -19 --rm "dist/argument-comment-lint/${{ matrix.target }}/${{ matrix.lib_name }}"
+
+      - uses: actions/upload-artifact@v7
+        with:
+          name: argument-comment-lint-${{ matrix.target }}
+          path: dist/argument-comment-lint/${{ matrix.target }}/*

.github/workflows/rust-release.yml

@@ -380,11 +380,19 @@ jobs:
       publish: true
     secrets: inherit
 
+  argument-comment-lint-release-assets:
+    name: argument-comment-lint release assets
+    needs: tag-check
+    uses: ./.github/workflows/rust-release-argument-comment-lint.yml
+    with:
+      publish: ${{ !contains(github.ref_name, '-') }}
+
   release:
     needs:
       - build
       - build-windows
       - shell-tool-mcp
+      - argument-comment-lint-release-assets
     name: release
     runs-on: ubuntu-latest
     permissions:
@@ -521,6 +529,14 @@ jobs:
           tag: ${{ github.ref_name }}
           config: .github/dotslash-config.json
 
+      - if: ${{ !contains(steps.release_name.outputs.name, '-') }}
+        uses: facebook/dotslash-publish-release@v2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag: ${{ github.ref_name }}
+          config: .github/dotslash-argument-comment-lint-config.json
+
       - name: Trigger developers.openai.com deploy
         # Only trigger the deploy if the release is not a pre-release.
         # The deploy is used to update the developers.openai.com website with the new config schema json file.

codex-rs/tui/src/app.rs

@@ -285,6 +285,32 @@ fn emit_missing_system_bwrap_warning(app_event_tx: &AppEventSender) {
     )));
 }
 
+async fn emit_custom_prompt_deprecation_notice(app_event_tx: &AppEventSender, codex_home: &Path) {
+    let prompts_dir = codex_home.join("prompts");
+    let prompt_count = codex_core::custom_prompts::discover_prompts_in(&prompts_dir)
+        .await
+        .len();
+    if prompt_count == 0 {
+        return;
+    }
+
+    let prompt_label = if prompt_count == 1 {
+        "prompt"
+    } else {
+        "prompts"
+    };
+    let details = format!(
+        "Detected {prompt_count} custom {prompt_label} in `$CODEX_HOME/prompts`. Use the `$skill-creator` skill to convert each custom prompt into a skill."
+    );
+
+    app_event_tx.send(AppEvent::InsertHistoryCell(Box::new(
+        history_cell::new_deprecation_notice(
+            "Custom prompts are deprecated and will soon be removed.".to_string(),
+            Some(details),
+        ),
+    )));
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 struct SessionSummary {
     usage_line: String,
@@ -1974,6 +2000,7 @@ impl App {
         let app_event_tx = AppEventSender::new(app_event_tx);
         emit_project_config_warnings(&app_event_tx, &config);
         emit_missing_system_bwrap_warning(&app_event_tx);
+        emit_custom_prompt_deprecation_notice(&app_event_tx, &config.codex_home).await;
         tui.set_notification_method(config.tui_notification_method);
 
         let harness_overrides =
@@ -4324,6 +4351,62 @@ mod tests {
         );
     }
 
+    fn render_history_cell(cell: &dyn HistoryCell, width: u16) -> String {
+        cell.display_lines(width)
+            .into_iter()
+            .map(|line| line.to_string())
+            .collect::<Vec<_>>()
+            .join("\n")
+    }
+
+    #[tokio::test]
+    async fn startup_custom_prompt_deprecation_notice_emits_when_prompts_exist() -> Result<()> {
+        let codex_home = tempdir()?;
+        let prompts_dir = codex_home.path().join("prompts");
+        std::fs::create_dir_all(&prompts_dir)?;
+        std::fs::write(prompts_dir.join("review.md"), "# Review\n")?;
+
+        let (tx_raw, mut rx) = unbounded_channel();
+        let app_event_tx = AppEventSender::new(tx_raw);
+
+        emit_custom_prompt_deprecation_notice(&app_event_tx, codex_home.path()).await;
+
+        let cell = match rx.try_recv() {
+            Ok(AppEvent::InsertHistoryCell(cell)) => cell,
+            other => panic!("expected InsertHistoryCell event, got {other:?}"),
+        };
+        let rendered = render_history_cell(cell.as_ref(), 120);
+
+        assert_snapshot!("startup_custom_prompt_deprecation_notice", rendered);
+        assert!(rx.try_recv().is_err(), "expected only one startup notice");
+        Ok(())
+    }
+
+    #[tokio::test]
+    async fn startup_custom_prompt_deprecation_notice_skips_missing_prompts_dir() -> Result<()> {
+        let codex_home = tempdir()?;
+        let (tx_raw, mut rx) = unbounded_channel();
+        let app_event_tx = AppEventSender::new(tx_raw);
+
+        emit_custom_prompt_deprecation_notice(&app_event_tx, codex_home.path()).await;
+
+        assert!(rx.try_recv().is_err(), "expected no startup notice");
+        Ok(())
+    }
+
+    #[tokio::test]
+    async fn startup_custom_prompt_deprecation_notice_skips_empty_prompts_dir() -> Result<()> {
+        let codex_home = tempdir()?;
+        std::fs::create_dir_all(codex_home.path().join("prompts"))?;
+        let (tx_raw, mut rx) = unbounded_channel();
+        let app_event_tx = AppEventSender::new(tx_raw);
+
+        emit_custom_prompt_deprecation_notice(&app_event_tx, codex_home.path()).await;
+
+        assert!(rx.try_recv().is_err(), "expected no startup notice");
+        Ok(())
+    }
+
     #[test]
     fn startup_waiting_gate_not_applied_for_resume_or_fork_session_selection() {
         let wait_for_resume = App::should_wait_for_initial_session(&SessionSelection::Resume(

codex-rs/tui/src/snapshots/codex_tui__app__tests__startup_custom_prompt_deprecation_notice.snap

@@ -0,0 +1,7 @@
+---
+source: tui/src/app.rs
+expression: rendered
+---
+⚠ Custom prompts are deprecated and will soon be removed.
+Detected 1 custom prompt in `$CODEX_HOME/prompts`. Use the `$skill-creator` skill to convert each custom prompt into
+a skill.

tools/argument-comment-lint/README.md

@@ -68,6 +68,10 @@ cd tools/argument-comment-lint
 cargo test
 ```
 
+Stable GitHub releases also publish a DotSlash file named
+`argument-comment-lint` for the prebuilt library on macOS arm64, Linux arm64,
+Linux x64, and Windows x64.
+
 Run the lint against `codex-rs` from the repo root:
 
 ```bash