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+---
+phase: 01-foundation
+plan: "02"
+subsystem: netbox
+tags: [go, netbox, client, custom-fields, tdd]
+dependency_graph:
+  requires: []
+  provides: [internal/netbox.Client, internal/netbox.ParseCustomFields, internal/netbox.BuildCustomFieldsPatch]
+  affects: [internal/quality, internal/hwid, internal/waq]
+tech_stack:
+  added: [github.com/netbox-community/go-netbox/v4 v4.3.0, gopkg.in/validator.v2 v2.0.1]
+  patterns: [wrapper-client, typed-custom-fields, integration-skip-guard]
+key_files:
+  created:
+    - internal/netbox/client.go
+    - internal/netbox/types.go
+    - internal/netbox/client_test.go
+    - internal/netbox/custom_fields.go
+    - internal/netbox/custom_fields_test.go
+  modified:
+    - go.mod
+    - go.sum
+decisions:
+  - id: NB-CLIENT-01
+    summary: "Strip /api suffix from base URL in NewClient to avoid go-netbox double-appending /api"
+  - id: NB-CLIENT-02
+    summary: "PatchedWritableDeviceWithConfigContextRequest.SetCustomFields(map) is the correct go-netbox v4 PATCH pattern"
+  - id: NB-CF-01
+    summary: "BuildCustomFieldsPatch only includes non-empty fields — avoids clearing existing NetBox values on partial update"
+metrics:
+  duration: "~15 minutes"
+  completed: "2026-04-10T05:17:22Z"
+  tasks_completed: 2
+  files_created: 5
+  files_modified: 2
+---
+
+# Phase 1 Plan 02: NetBox Client Package Summary
+
+**One-liner:** go-netbox v4 typed client wrapper with safe custom field read/write helpers and integration-skip guards for placeholder tokens.
+
+## What Was Built
+
+### `internal/netbox/types.go`
+Domain types that decouple the rest of HWLab from go-netbox generated types:
+- `Device` — HWLab inventory item (ID, Name, AssetTag, CustomFields, Created, LastUpdated)
+- `CustomFields` — typed struct over NetBox's `map[string]interface{}` response (HWID, CatalogStatus, ProductURL, FirmwareVersion, TestDate, TestData, AINotes, PhotoURLs)
+
+### `internal/netbox/client.go`
+`Client` struct wrapping `*nb.APIClient` with methods:
+- `NewClient(url, token string) (*Client, error)` — validates inputs, strips trailing `/api` from URL before passing to `nb.NewAPIClientFor`
+- `Ping(ctx)` — lightweight connectivity check via `DcimDevicesList(limit=1)`
+- `ListDevices(ctx, limit)` — returns `[]Device` mapped via `deviceFromNetBox`
+- `GetDevice(ctx, id)` — retrieves single device by NetBox internal ID
+
+### `internal/netbox/custom_fields.go`
+- `ParseCustomFields(raw map[string]interface{}) CustomFields` — safe type assertions for all 8 HWLab custom field keys; handles nil input; handles `[]interface{}` photo_urls
+- `BuildCustomFieldsPatch(hwID, catalogStatus string, photoURLs []string) map[string]interface{}` — selective patch (only non-empty fields included)
+- `BuildFullCustomFieldsPatch(cf CustomFields) map[string]interface{}` — full patch for initial record creation
+- `(c *Client) PatchCustomFields(ctx, deviceID, patch)` — uses `nb.PatchedWritableDeviceWithConfigContextRequest.SetCustomFields()` then `.Execute()`
+
+## Integration Test Status
+
+Integration tests (TestPingLive, TestListDevicesLive, TestPatchCustomFieldsRoundTrip) **SKIPPED** because `HWLAB_NETBOX_TOKEN=homelab-netbox-api-token-2024` is a placeholder (22 chars, not 40).
+
+Skip guard: `if len(token) != 40 { t.Skip(...) }` — correct behavior, no errors.
+
+To run integration tests: set `HWLAB_NETBOX_TOKEN` to a real 40-char hex token from NetBox UI, and `HWLAB_TEST_DEVICE_ID` to an existing device ID for round-trip test.
+
+## go-netbox v4 API Notes
+
+- **Struct confirmed:** `nb.PatchedWritableDeviceWithConfigContextRequest` with `SetCustomFields(map[string]interface{})` method
+- **PATCH pattern:** `c.api.DcimAPI.DcimDevicesPartialUpdate(ctx, int32(id)).PatchedWritableDeviceWithConfigContextRequest(req).Execute()`
+- **URL handling:** `NewAPIClientFor` appends `/api` internally — must strip trailing `/api` from the URL in the config to avoid `http://host:8000/api/api/`
+- **AssetTag type:** `NullableString` on `DeviceWithConfigContext` — `GetAssetTag()` returns empty string when null (safe)
+- **CustomFields on read:** `map[string]interface{}` — requires type assertions per field
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 3 - Blocking] custom_fields.go written in Task 1 to unblock compilation**
+- **Found during:** Task 1 GREEN phase
+- **Issue:** `client.go` calls `ParseCustomFields` which was planned for Task 2; package would not compile without it
+- **Fix:** Wrote `custom_fields.go` as part of Task 1 implementation to make `go test` work; Task 2 then added only `custom_fields_test.go`
+- **Files modified:** internal/netbox/custom_fields.go (created during Task 1 pass)
+- **Commit:** 9f3ed9f (Task 1 commit includes custom_fields.go)
+
+**2. [Rule 2 - Missing] Added HWLAB_TEST_DEVICE_ID guard to round-trip integration test**
+- **Found during:** Task 2 test design
+- **Issue:** Round-trip test needs an existing device ID — hardcoding one would fail on fresh NetBox installs
+- **Fix:** Added second `t.Skip()` guard when `HWLAB_TEST_DEVICE_ID` env var is absent
+- **Files modified:** internal/netbox/custom_fields_test.go
+
+## Self-Check
+
+Files created:
+- internal/netbox/client.go: FOUND
+- internal/netbox/types.go: FOUND
+- internal/netbox/client_test.go: FOUND
+- internal/netbox/custom_fields.go: FOUND
+- internal/netbox/custom_fields_test.go: FOUND
+
+Commits:
+- 9f3ed9f — Task 1 (NetBox client wrapper)
+- 17a2eb6 — Task 2 (custom field wrappers)
+
+`go build ./...`: PASS
+`go test ./internal/netbox/... -run TestNewClientValidation`: PASS
+`go test ./internal/netbox/... -run "TestParseCustomFields|TestBuildCustomFields"`: PASS (5 tests)
+Integration tests: SKIP (placeholder token — correct behavior)
+
+## Self-Check: PASSED