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+# AGENTS.md — Containr
+
+Containr is a self-hosted Docker PaaS (Railway-style). Backend: Go + Gin + PostgreSQL (sqlc) + Redis-compatible cache (Dragonfly) + Docker API. Frontend: React + Vite + TypeScript + React Query. API contract: `docs/api/openapi.yaml` (generated types: `app/frontend/src/generated/api-types.ts`).
+
+This file is for **coding agents working on the repo**. For operating Containr as a deployed product, see `llms.txt`.
+
+## Layout
+
+- `app/backend` — Go monolith. Entrypoints: `cmd/server` (API), `cmd/cli` (`containr` CLI), `cmd/mcp` (`containr-mcp` MCP server).
+- `app/backend/internal/api` — Gin handlers + route groups (`routes.go`: public / `read` OptionalAuth / `authed` / `admin`).
+- `app/backend/internal/middleware` — `Auth` (JWT + Better Auth session + PAT), `RequireAdmin`, `Idempotency`.
+- `app/backend/internal/cli/commands` — all CLI commands; shared `Client`, `Output`, `confirm` helpers live here.
+- `app/backend/internal/mcpserver` — declarative MCP tool registry mirroring the API.
+- `app/backend/sqlc` — `schema.sql` + `queries/*.sql`; generate via `sqlc generate` into `internal/database/sqlcdb`.
+- `app/backend/migrations_goose` — goose migrations (`YYYYMMDDHHMMSS_name.sql`).
+- `app/frontend` — React app. Pages under `src/features/`, API calls via `src/lib/api-client.ts`.
+
+## Build / test / verify
+
+```sh
+cd app/backend && go build ./... && go vet ./... && go test ./...
+cd app/frontend && npx tsc --noEmit && npm run lint && npm run build
+cd app/frontend && npm run generate:api   # after any openapi.yaml change
+```
+
+Dev stack: Postgres on `:15432` (`containr-postgres-1`), Dragonfly on `:16379` (`containr-dragonfly-1`). Server needs `DATABASE_URL`, `REDIS_URL`, `JWT_SECRET`, `PORT=8080`.
+
+## Conventions that matter
+
+- New endpoints go in the right route group; mutations on `authed`/`admin` get idempotency for free.
+- New list endpoints use `pageWindow`/`paginationMeta` (`internal/api/pagination.go`) — cursor + page, `next_cursor` in the envelope.
+- New errors use stable codes via `respondError(c, status, code, msg)` in `internal/api/errors.go`.
+- New CLI command → also register an MCP tool in `internal/mcpserver/server.go` and document in OpenAPI. All three surfaces ship together.
+- Destructive CLI commands must gate on `--yes`/`confirm` via `commands.confirm`; destructive MCP tools require `confirm: true`.
+- sqlc: edit `schema.sql` + `queries/*.sql`, run `sqlc generate`, add the goose migration.
+- Don't commit secrets. PATs (`cnp_…`) and agent tokens (`cagt_…`) are sha256-hashed at rest; raw values are shown once.
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+# Containr
+
+> Self-hosted Docker PaaS — deploy and manage containerized apps, databases, cron jobs and preview environments. Operable by humans (web UI) and agents (API / CLI / MCP) through one contract.
+
+Base URL: `https://<host>/api/v1`. OpenAPI: `docs/api/openapi.yaml`.
+
+## Access (pick one)
+
+- **API**: `Authorization: Bearer <pat>` — create a PAT in Settings → Access Tokens or `containr tokens create`. Scopes: `read` (GET/HEAD/OPTIONS only), `write` (everything but admin routes), `admin` (requires platform-admin owner).
+- **CLI**: `containr auth login --api-url <url>` (or `--token cnp_…`), then e.g. `containr projects list --json`, `containr up`. Global flags: `--json`, `--yes`, `--profile`, `--idempotency-key`.
+- **MCP**: run `containr-mcp` over stdio with `CONTAINR_API_URL` + `CONTAINR_TOKEN` env (or CLI profile). ~60 tools mirroring the API; destructive tools require `confirm: true`.
+
+## Conventions
+
+- **Errors**: `{"error": "msg", "code": "MACHINE_CODE"}`. Codes: `UNAUTHENTICATED`, `INVALID_TOKEN`, `FORBIDDEN`, `ADMIN_REQUIRED`, `SCOPE_INSUFFICIENT`, `NOT_FOUND`, `VALIDATION`, `CONFLICT`, `INTERNAL`, `DEPENDENCY_UNAVAILABLE`, `IDEMPOTENCY_IN_PROGRESS`.
+- **Idempotency**: send `Idempotency-Key: <uuid>` on POSTs — the first response replays for 24h; concurrent duplicates get 409. Always safe to send.
+- **Pagination**: `?limit=` + `?cursor=` (pass `pagination.next_cursor` verbatim; legacy `?page=` also works). Invalid cursors fall back to page 1.
+- **Identifiers**: all ids are UUIDs. Tokens: `cnp_` user PATs, `cagt_` agent onboarding tokens.
+
+## Core objects
+
+`projects` → `services` (git/app deploys) → `deployments`; plus `databases`, `templates`, `cron-jobs`, `variables`, `volumes`, `preview-environments`, `nodes`, `scaling`, `security`, `gateway`, `admin`, `notifications`, `user/tokens`.
+
+## Docs
+
+- `docs/guides/CLI.md` — full CLI reference
+- `docs/guides/OPERATIONS.md` — PATs, agent tokens, ops
+- `docs/api/openapi.yaml` — request/response contract
+- `ROADMAP2.md` — product roadmap
+- `AGENTS.md` — repo conventions for coding agents