diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..299ecb4
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,56 @@
+name: CI
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+
+jobs:
+  rust:
+    name: Lint and Test (stable, ${{ matrix.features }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        features:
+          - ""
+          - complex
+          - stream
+          - complex,stream
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy, rustfmt
+
+      - name: Ensure components present
+        run: |
+          rustup component add clippy rustfmt || true
+
+      - name: Cache cargo
+        uses: Swatinem/rust-cache@v2
+
+      - name: Format check
+        run: cargo fmt --all -- --check
+
+      - name: Check (build all targets)
+        run: |
+          if [ -n "${{ matrix.features }}" ]; then
+            cargo check --all-targets --features "${{ matrix.features }}"
+          else
+            cargo check --all-targets
+          fi
+
+      - name: Test
+        run: |
+          if [ -n "${{ matrix.features }}" ]; then
+            cargo test --features "${{ matrix.features }}"
+          else
+            cargo test
+          fi
+
+# Note: OpenCL-related tests are not run in CI by default.
+# They require GPU drivers and an OpenCL ICD on the runner.
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..fe9b85d
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,36 @@
+# Repository Guidelines
+
+## Project Structure & Module Organization
+- Source: `src/` with host and GPU backends: `src/host/`, `src/opencl/`, and core types in `src/array.rs`, `src/buffer.rs`, `src/ops/`.
+- Library entry: `src/lib.rs` (crate type `rlib`/`cdylib`).
+- OpenCL kernels: `src/opencl/programs/`.
+- Tests: integration tests in `tests/*.rs` (e.g., `tests/construct.rs`).
+- Packaging/build metadata: `Cargo.toml`, `Cargo.lock`; container setup in `Dockerfile`.
+
+## Build, Test, and Development Commands
+- Build (CPU/host only): `cargo build`.
+- Enable features (e.g., OpenCL): `cargo build --features opencl` or all: `cargo build --features all`.
+- Run tests: `cargo test` (host) or `cargo test --features opencl`.
+- Docs: `cargo doc --no-deps` (add `--open` locally to view).
+- Format and lint: `cargo fmt --all` and `cargo clippy --all-targets --all-features -D warnings`.
+
+## Coding Style & Naming Conventions
+- Rust 2021 edition; 4-space indentation; keep lines reasonably short.
+- Modules/files: `snake_case` (e.g., `array.rs`); types/traits: `PascalCase` (e.g., `ArrayBuf`); functions/fields: `snake_case`.
+- Prefer explicit types and small, focused modules; keep unsafe blocks minimal and well-justified.
+- Run `cargo fmt` and `cargo clippy` before pushing.
+
+## Testing Guidelines
+- Framework: Rust `#[test]` with `cargo test`; integration tests live in `tests/*.rs`.
+- Name tests descriptively (e.g., `#[test] fn transpose_concat_validates_dims()`), assert both values and shapes.
+- For GPU-specific logic, guard with feature flags and provide host fallbacks when possible.
+- Keep tests deterministic and fast; seed randomness when used.
+
+## Commit & Pull Request Guidelines
+- Commits: short, imperative subject (e.g., "implement Array::concat"), reference issues when relevant (e.g., `(#28)`).
+- PRs: include a clear description, motivation, feature flags used (`opencl`, `complex`, etc.), and test coverage notes; add benchmarks only if necessary.
+- Required: passing `cargo test`, `cargo fmt`, and `cargo clippy` with no new warnings.
+
+## Security & Configuration Tips
+- OpenCL support is optional (`--features opencl`) and requires drivers/ICD on the host; verify with `clinfo`.
+- The provided `Dockerfile` can build with GPU support; run with `docker run --gpus=all` when testing OpenCL.