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+# EVE Haul Agent Guide
+
+## Start Here
+
+- See [readme.md](readme.md) for product context and the Python/React/Rust split.
+- Treat the Python backend as the active application backend. The React frontend is hardcoded to `http://localhost:8000`.
+- Treat `rust_backend/` as an experimental rewrite. It runs separately on `127.0.0.1:8080` and is not a drop-in replacement for the Python backend.
+
+## Run and Validate
+
+- Frontend: `cd frontend && npm install && npm start`
+- Frontend tests: `cd frontend && npm test -- --watchAll=false`
+- Frontend build: `cd frontend && npm run build`
+- Python backend: `cd backend/src && python -m uvicorn main:app --reload --port 8000`
+- Rust backend: `cd rust_backend && cargo run`
+- Rust tests: `cd rust_backend && cargo test`
+- The Python backend has no checked-in dependency manifest. Before running it, confirm the local environment already has the required packages plus the EVE auth/cache files and CSV map data under `backend/data/`.
+
+## Architecture
+
+- `backend/src/main.py` is a thin FastAPI shell. `backend/src/manager.py` owns mutable state, polling, and route generation.
+- `backend/src/esi/` owns ESI auth, character location, waypoint updates, and other live API side effects.
+- `backend/src/graph.py`, `loader.py`, `market.py`, `arbitrage.py`, `pathfinder.py`, and `route.py` form the route-planning and market-analysis pipeline.
+- `frontend/src/` uses small function components. `usePolling.js` and `useSSE.js` own long-lived network subscriptions; display components render the returned payloads.
+- `rust_backend/src/main.rs` is a thin Actix entrypoint. `manager.rs` owns shared state and polling, `eve_service.rs` wraps `eve_api.rs`, and `pathfinding/` plus `market/` stay modular.
+
+## Repo-Specific Conventions
+
+- Preserve the current port split unless the task is explicitly a migration: frontend `:3000`, Python backend `:8000`, Rust backend `:8080`.
+- Keep external API calls and UI side effects out of the route-planning and market-analysis modules.
+- Prefer typed models, named thresholds/constants, and small transformations over ad hoc inline logic in backend algorithms.
+- When changing the Rust backend, do not assume Python endpoint parity. Add routes, SSE or polling support, and CORS explicitly before wiring the frontend to it.
+- Be cautious about local-only runtime dependencies: Python expects ESI auth/cache state plus CSV map data under `backend/data/`; Rust expects OAuth env vars and `token.json`. \ No newline at end of file