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+# Repository Guidelines
+
+## Project Structure & Module Organization
+
+- `src/`: Rust source for the `pfs-tftp` binary (entrypoint: `src/main.rs`).
+- `tests/`: Integration tests (create as needed; Cargo auto-discovers `tests/*.rs`).
+- `rfc1350.txt`: TFTP protocol reference (RFC 1350).
+- `Cargo.toml` / `Cargo.lock`: Cargo manifest and locked dependency graph.
+
+Keep modules cohesive: protocol parsing/encoding in a dedicated module (e.g., `src/tftp.rs`), I/O and CLI wiring in `src/main.rs`.
+
+## Build, Test, and Development Commands
+
+- `cargo build`: Compile the project.
+- `cargo run`: Build and run the local binary.
+- `cargo test`: Run unit and integration tests.
+- `cargo +nightly fmt`: Format code using `rustfmt.toml`.
+- `cargo clippy --all-targets --all-features -D warnings`: Lint and fail on warnings.
+- `cargo check`: Fast type-check without producing binaries.
+
+## Coding Style & Naming Conventions
+
+- Use Rust defaults: 4-space indentation, no tabs, and let `rustfmt` decide layout.
+- Follow naming conventions: `snake_case` (modules/functions), `PascalCase` (types/traits), `SCREAMING_SNAKE_CASE` (consts).
+- Prefer small, testable functions and explicit error handling (`Result<T, E>` with meaningful error messages).
+
+## Testing Guidelines
+
+- Unit tests: colocate under `#[cfg(test)] mod tests { ... }` in the relevant module.
+- Integration tests: add `tests/<area>.rs` (e.g., `tests/packet_roundtrip.rs`).
+- Target behaviors: packet encode/decode round-trips, error cases, and RFC compliance edge cases.
+
+## Commit & Pull Request Guidelines
+
+- Git history is currently minimal; use a consistent convention going forward (recommended: Conventional Commits like `feat: ...`, `fix: ...`, `test: ...`).
+- Keep commits focused and avoid mixing refactors with behavior changes.
+- Commit messages should be clear and descriptive. They should always include enough context so that someone reading them in 5 years can still comprehend the intent, the why, how and everything.
+
+## Agent-Specific Notes
+
+- Prefer small, reviewable diffs and update this file when commands or structure change.
+- Avoid adding dependencies unless needed; justify new crates in the PR description.