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matdev83 merged 2 commits into from
Jun 27, 2026
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feat(backends): add Hugging Face connector #34

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0c8c0ed
feat(backends): add Hugging Face connector
Jun 27, 2026
adfc1d7
fix(backends): address Hugging Face review feedback
Jun 27, 2026
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4 changes: 2 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -84,8 +84,8 @@ Use YAML under [`config/examples/`](config/examples/) with the bundled **`local-
- [`lipapi.SessionRef`](pkg/lipapi/call.go) — the proxy-owned session id field is **`AuthoritativeSessionID`** (renamed from `SessionID` to avoid stutter with the struct name). JSON still uses the key **`SessionID`** for wire compatibility.
- [`lipsdk.FrontendMount`](pkg/lipsdk/factory.go) now takes a single [`lipsdk.FrontendMountOptions`](pkg/lipsdk/factory.go) after the [`http.ServeMux`](https://pkg.go.dev/net/http#ServeMux). [`pluginreg.(*Registry).MountFrontend`](internal/pluginreg/reg.go) matches that shape (factory id, mux, options).
- [`stdhttp.MountBundledFrontends`](internal/stdhttp/mount.go) takes [`stdhttp.MountBundledFrontendsInput`](internal/stdhttp/mount.go) instead of six separate parameters.
- Composition roots: [`pluginreg.InstallStandardBundleOn`](internal/pluginreg/standard_table.go) / [`InstallStandardBackendsOn`](internal/pluginreg/standard_table.go) take [`pluginreg.UpstreamAPIKeys`](internal/pluginreg/keys.go) (per-family **ordered slices**; use [`ResolveUpstreamAPIKeysFromEnv`](internal/pluginreg/keys.go) in `main`, or `UpstreamAPIKeys{}` in tests). Env resolution includes numbered keys (`OPENAI_API_KEY_2`, … **contiguous** suffixes only: scanning stops at the first missing or empty `_N`, so a gap like `_2` unset while `_3` is set will not load `_3`; same pattern for Anthropic/Gemini/OpenRouter/NVIDIA). Hosted backend YAML accepts optional `api_keys` alongside `api_key` (see [`config/config.multi-instance.example.yaml`](config/config.multi-instance.example.yaml)). [`runtime.New`](internal/core/runtime/app.go), [`runtimebundle.Build`](internal/infra/runtimebundle/build.go), [`stdhttp.Run`](internal/stdhttp/server.go), and [`stdhttp.RunWithRuntime`](internal/stdhttp/server.go) require a **non-nil** `*slog.Logger`. [`pluginreg.(*Registry).RegisterBackend`](internal/pluginreg/reg.go) factories return [`execbackend.Backend`](internal/core/execbackend/backend.go) directly (not `any`). [`sqlitestore.New`](internal/core/continuity/sqlitestore/store.go) accepts an existing `*sql.DB` for tests.
- **Hosted provider backends (multi-key pools)** — The bundled `openai-responses`, `openai-legacy`, `anthropic`, `gemini`, `openrouter`, and `nvidia` backends keep ordered credentials per instance, classify pre-output 401/429 from the official SDKs, and may return [`lipapi.RecoverablePreOutputError`](pkg/lipapi/upstream.go) from [`execbackend.Backend.Open`](internal/core/execbackend/backend.go) when no key is usable before the first canonical stream event (including single-key rate limit or auth failure). They do not return an [`lipapi.EventStream`](pkg/lipapi/events.go) that fails only during [`lipapi.Collect`](pkg/lipapi/events.go) for that case. **401 handling:** HTTP 401 from the hosted upstream is treated as **permanently invalid** for that credential inside the process (the pool marks it unusable until restart); this matches static API keys but is not suitable for short-lived tokens that might recover without a restart. **429 / Gemini:** OpenAI and Anthropic read `Retry-After` from the SDK error where available; the genai client does not attach response headers to [`genai.APIError`](https://pkg.go.dev/google.golang.org/genai#APIError), so the Gemini adapter also reads [`google.rpc.RetryInfo`](https://cloud.google.com/apis/design/errors#error_details) from error JSON `details` when present, otherwise it uses a conservative fixed cooldown fallback.
- Composition roots: [`pluginreg.InstallStandardBundleOn`](internal/pluginreg/standard_table.go) / [`InstallStandardBackendsOn`](internal/pluginreg/standard_table.go) take [`pluginreg.UpstreamAPIKeys`](internal/pluginreg/keys.go) (per-family **ordered slices**; use [`ResolveUpstreamAPIKeysFromEnv`](internal/pluginreg/keys.go) in `main`, or `UpstreamAPIKeys{}` in tests). Env resolution includes numbered keys (`OPENAI_API_KEY_2`, … **contiguous** suffixes only: scanning stops at the first missing or empty `_N`, so a gap like `_2` unset while `_3` is set will not load `_3`; same pattern for Anthropic/Gemini/OpenRouter/NVIDIA/Hugging Face). Hosted backend YAML accepts optional `api_keys` alongside `api_key` (see [`config/config.multi-instance.example.yaml`](config/config.multi-instance.example.yaml)). [`runtime.New`](internal/core/runtime/app.go), [`runtimebundle.Build`](internal/infra/runtimebundle/build.go), [`stdhttp.Run`](internal/stdhttp/server.go), and [`stdhttp.RunWithRuntime`](internal/stdhttp/server.go) require a **non-nil** `*slog.Logger`. [`pluginreg.(*Registry).RegisterBackend`](internal/pluginreg/reg.go) factories return [`execbackend.Backend`](internal/core/execbackend/backend.go) directly (not `any`). [`sqlitestore.New`](internal/core/continuity/sqlitestore/store.go) accepts an existing `*sql.DB` for tests.
- **Hosted provider backends (multi-key pools)** — The bundled `openai-responses`, `openai-legacy`, `anthropic`, `gemini`, `openrouter`, `nvidia`, and `huggingface` backends keep ordered credentials per instance, classify pre-output 401/429 from the official SDKs, and may return [`lipapi.RecoverablePreOutputError`](pkg/lipapi/upstream.go) from [`execbackend.Backend.Open`](internal/core/execbackend/backend.go) when no key is usable before the first canonical stream event (including single-key rate limit or auth failure). They do not return an [`lipapi.EventStream`](pkg/lipapi/events.go) that fails only during [`lipapi.Collect`](pkg/lipapi/events.go) for that case. **401 handling:** HTTP 401 from the hosted upstream is treated as **permanently invalid** for that credential inside the process (the pool marks it unusable until restart); this matches static API keys but is not suitable for short-lived tokens that might recover without a restart. **429 / Gemini:** OpenAI and Anthropic read `Retry-After` from the SDK error where available; the genai client does not attach response headers to [`genai.APIError`](https://pkg.go.dev/google.golang.org/genai#APIError), so the Gemini adapter also reads [`google.rpc.RetryInfo`](https://cloud.google.com/apis/design/errors#error_details) from error JSON `details` when present, otherwise it uses a conservative fixed cooldown fallback.
Comment on lines +87 to +88

@coderabbitai coderabbitai Bot Jun 27, 2026

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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

README now disagrees with itself about supported env key families.

These lines add Hugging Face correctly, but the earlier cmd/lipstd startup-flow bullet in this same README still omits HUGGINGFACE_API_KEY / numbered suffixes. That leaves two conflicting descriptions of what ResolveUpstreamAPIKeysFromEnv loads. Please update the earlier bullet too so operators do not miss the new credential family.

🤖 Prompt for AI Agents 
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@README.md` around lines 87 - 88, README has inconsistent documentation for
ResolveUpstreamAPIKeysFromEnv because the earlier startup-flow bullet still
omits the Hugging Face key family. Update that existing bullet to mention
HUGGINGFACE_API_KEY and its numbered suffixes, matching the later Composition
roots note, so both descriptions list the same supported env key families and
ordering rules.

- **Terminal stream errors** — [`lipapi.Collect`](pkg/lipapi/events.go) and bundled frontend SSE encoders surface terminal upstream failures as [`lipapi.ErrStreamTerminal`](pkg/lipapi/errors.go) / [`*lipapi.StreamError`](pkg/lipapi/errors.go) (stable `Error()` string `lipapi: stream error`; use [`errors.As`](https://pkg.go.dev/errors#As) for `Code` and `Message`). This replaces embedding provider text directly in `err.Error()`.
- **ACP JSON-RPC errors** — The bundled ACP client returns [`*acp.RPCError`](internal/plugins/backends/acp/rpc_error.go) with stable `Error()` text per RPC method; use `Code` / `Message` for vendor detail. Optional [`acp.Config.Log`](internal/plugins/backends/acp/plugin.go) enables debug logs when a best-effort cancel RPC fails after consumer cancellation.

Expand Down
27 changes: 19 additions & 8 deletions cmd/model-inventory-proof/main.go
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Expand Up @@ -15,6 +15,7 @@ import (
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/anthropic"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/bedrock"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/gemini"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/huggingface"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/nvidia"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/openailegacy"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/openairesponses"
Expand Down Expand Up @@ -97,8 +98,21 @@ func main() {
}

func credentialedBackendCandidates(keys pluginreg.UpstreamAPIKeys, awsEnv awsEnvironment) ([]backendCandidate, []skipReport) {
candidates := make([]backendCandidate, 0, 7)
skipped := make([]skipReport, 0, 7)
staticBackends := []struct {
id string
env string
values []string
}{
{openairesponses.ID, "OPENAI_API_KEY", keys.OpenAI},
{openailegacy.ID, "OPENAI_API_KEY", keys.OpenAI},
{anthropic.ID, "ANTHROPIC_API_KEY", keys.Anthropic},
{gemini.ID, "GEMINI_API_KEY", keys.Gemini},
{openrouter.ID, "OPENROUTER_API_KEY", keys.OpenRouter},
{nvidia.ID, "NVIDIA_API_KEY", keys.Nvidia},
{huggingface.ID, "HUGGINGFACE_API_KEY", keys.HuggingFace},
}
candidates := make([]backendCandidate, 0, len(staticBackends)+1)
skipped := make([]skipReport, 0, len(staticBackends)+1)

addStaticKeyBackend := func(id, envName string, values []string) {
if len(values) == 0 {
Expand All @@ -108,12 +122,9 @@ func credentialedBackendCandidates(keys pluginreg.UpstreamAPIKeys, awsEnv awsEnv
candidates = append(candidates, backendCandidate{ID: id, Config: "{}"})
}

addStaticKeyBackend(openairesponses.ID, "OPENAI_API_KEY", keys.OpenAI)
addStaticKeyBackend(openailegacy.ID, "OPENAI_API_KEY", keys.OpenAI)
addStaticKeyBackend(anthropic.ID, "ANTHROPIC_API_KEY", keys.Anthropic)
addStaticKeyBackend(gemini.ID, "GEMINI_API_KEY", keys.Gemini)
addStaticKeyBackend(openrouter.ID, "OPENROUTER_API_KEY", keys.OpenRouter)
addStaticKeyBackend(nvidia.ID, "NVIDIA_API_KEY", keys.Nvidia)
for _, backend := range staticBackends {
addStaticKeyBackend(backend.id, backend.env, backend.values)
}

if ok, reason := awsEnv.usableForBedrock(); ok {
candidates = append(candidates, backendCandidate{
Expand Down
7 changes: 6 additions & 1 deletion config/config.yaml
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Expand Up @@ -276,6 +276,11 @@ plugins:
config: {}
# base_url: https://integrate.api.nvidia.com/v1 # default
# api_key: "" # or use NVIDIA_API_KEY / NVIDIA_API_KEY_N env vars
- id: huggingface
enabled: false
config: {}
# base_url: https://router.huggingface.co/v1 # default
# api_key: "" # or use HUGGINGFACE_API_KEY / HUGGINGFACE_API_KEY_N env vars
- id: opencode-go
enabled: false
config: {}
Expand Down Expand Up @@ -352,7 +357,7 @@ plugins:
# timeout: 15s
# Custom compatible backends let operators add API-compatible providers without code.
# Use kind to select the generic factory; id remains the runtime route backend instance.
# backend_prefix must be unique, cannot contain / or :, and cannot use standard connector prefixes such as nvidia/openrouter/anthropic.
# backend_prefix must be unique, cannot contain / or :, and cannot use standard connector prefixes such as nvidia/openrouter/huggingface/anthropic.
# api_key_env_var_root reads ROOT, ROOT_2, ROOT_3, ... using the standard static key convention.
# - id: provider123
# kind: custom-openai-legacy-compatible
Expand Down
1 change: 1 addition & 0 deletions docs/backend-adapter-boundaries.md
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Expand Up @@ -19,6 +19,7 @@ Regression tests **must** cover mapping behavior (streaming order, tool events,
| `acp` | Parity + ACP subset (tools deferred per matrix) | HTTP client + ACP-specific session/update flows |
| `nvidia` | Parity + NVIDIA NIM chat/responses wire | `openai-go` client; `NVIDIA_API_KEY` env pool; `max_tokens` remap, `stream_options` strip, `extra_body` pass-through |
| `openrouter` | Parity + OpenRouter chat/responses wire | `openai-go` client; shared invoke/event mapping via [`openaicompat`](../internal/plugins/backends/openaicompat/); OpenRouter-specific headers and extensions |
| `huggingface` | Parity + Hugging Face Inference Providers chat wire | `openai-go` client; shared invoke/event mapping via [`openaicompat`](../internal/plugins/backends/openaicompat/); chat completions only (`TransportChatOnly`); `HUGGINGFACE_API_KEY` env pool |
| `local-stub` | Dogfood YAML + executor stub tests | No upstream credentials ([`CredentialNone`](../pkg/lipsdk/backend_security.go)); deterministic text |

## Shared OpenAI-compatible adapter layer
Expand Down
1 change: 1 addition & 0 deletions internal/archtest/backend_lifecycle_contract_test.go
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Expand Up @@ -20,6 +20,7 @@ func TestOfficialBackendsHaveLifecycleContractTests(t *testing.T) {
"lmstudio": "openaicompat",
"openrouter": "openaicompat",
"nvidia": "openaicompat",
"huggingface": "openaicompat",
"vllm": "openaicompat",
"opencodego": "opencodecommon",
"opencodezen": "opencodecommon",
Expand Down
4 changes: 2 additions & 2 deletions internal/pluginreg/backend_prefix_inventory_test.go
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Expand Up @@ -68,7 +68,7 @@ func TestReservedStandardBackendPrefixes_coverStandardBackendPrefixes(t *testing
t.Fatalf("BuildBackend(%q) error = %v", id, err)
}
for _, prefix := range be.BackendPrefixes {
if _, ok := reservedStandardBackendPrefixes[prefix]; !ok {
if !isReservedStandardBackendPrefix(prefix) {
t.Fatalf("standard backend %q exposes prefix %q not reserved for custom connectors", id, prefix)
}
}
Expand All @@ -89,7 +89,7 @@ func standardBackendFactoryIDs(t *testing.T) []string {

func standardBackendBuildYAML(id string) string {
switch id {
case "acp", "anthropic", "openai-legacy", "openai-responses", "openrouter", "nvidia", "opencode-go", "opencode-zen":
case "acp", "anthropic", "openai-legacy", "openai-responses", "openrouter", "nvidia", "huggingface", "opencode-go", "opencode-zen":
return "base_url: http://127.0.0.1:9\n"
case "openai-codex":
return "base_url: http://127.0.0.1:9\naccess_token: test\n"
Expand Down
18 changes: 18 additions & 0 deletions internal/pluginreg/backends_misc.go
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Expand Up @@ -9,6 +9,7 @@ import (
"github.com/matdev83/go-llm-interactive-proxy/internal/core/config"
"github.com/matdev83/go-llm-interactive-proxy/internal/core/execbackend"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/acp"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/huggingface"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/llamacpp"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/lmstudio"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/localstub"
Expand Down Expand Up @@ -93,3 +94,20 @@ func backendNvidia(n yaml.Node, upstream *http.Client, keys UpstreamAPIKeys) (ex
}
return applyConfiguredModelInventory(nvidia.New(cfg), y.Models)
}

func backendHuggingface(n yaml.Node, upstream *http.Client, keys UpstreamAPIKeys) (execbackend.Backend, error) {
var y openAIStyleYAML
if err := config.DecodeYAMLNode(n, &y); err != nil {
return execbackend.Backend{}, fmt.Errorf("huggingface backend config: %w", err)
}
base := cmp.Or(strings.TrimSpace(y.BaseURL), huggingface.DefaultBaseURL)
ek, primaryKey := firstAPIKey(y.APIKey, y.APIKeys, y.Credentials, keys.HuggingFace)
cfg := huggingface.Config{
BaseURL: base,
APIKey: primaryKey,
APIKeys: ek,
Credentials: hostedCredentials(y.Credentials),
HTTPClient: resolveUpstreamHTTP(upstream),
}
return applyConfiguredModelInventory(huggingface.New(cfg), y.Models)
}
2 changes: 1 addition & 1 deletion internal/pluginreg/custom_backend_prefix_test.go
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Expand Up @@ -26,7 +26,7 @@ func TestValidateCustomBackendPrefix_rejectsInvalidCharacters(t *testing.T) {

func TestValidateCustomBackendPrefix_rejectsReservedStandardPrefixes(t *testing.T) {
t.Parallel()
for _, prefix := range []string{"nvidia", "openrouter", "anthropic", "openai-legacy", "openai-responses", "opencode-go", "opencode-zen"} {
for prefix := range standardBackendPrefixSet() {
err := validateCustomBackendPrefix(prefix)
if err == nil {
t.Fatalf("expected error for reserved backend_prefix %q", prefix)
Expand Down
51 changes: 16 additions & 35 deletions internal/pluginreg/custom_backends.go
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Expand Up @@ -8,25 +8,9 @@ import (

"github.com/matdev83/go-llm-interactive-proxy/internal/core/config"
"github.com/matdev83/go-llm-interactive-proxy/internal/core/execbackend"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/acp"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/anthropic"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/bedrock"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/credpool"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/gemini"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/llamacpp"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/lmstudio"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/localstub"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/modeldiscover"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/nvidia"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/ollama"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/openaicodex"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/openaicompat"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/openailegacy"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/openairesponses"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/opencodego"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/opencodezen"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/openrouter"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/vllm"
"github.com/matdev83/go-llm-interactive-proxy/pkg/lipapi"
"gopkg.in/yaml.v3"
)
Expand Down Expand Up @@ -91,7 +75,7 @@ func validateCustomBackendPrefix(prefix string) error {
if strings.Contains(prefix, "/") || strings.Contains(prefix, ":") {
return fmt.Errorf("custom backend: backend_prefix %q must not contain '/' or ':'", prefix)
}
if _, reserved := reservedStandardBackendPrefixes[prefix]; reserved {
if isReservedStandardBackendPrefix(prefix) {
return fmt.Errorf("custom backend: backend_prefix %q is reserved by a standard connector", prefix)
}
return nil
Expand Down Expand Up @@ -217,22 +201,19 @@ func backendCustomOpenAIResponsesCompatible(n yaml.Node, upstream *http.Client)
return buildCustomOpenAICompatibleBackend(y, upstream, openaicompat.FlavorResponses, customOpenAIResponsesTransportCaps())
}

var reservedStandardBackendPrefixes = map[string]struct{}{
openairesponses.ID: {},
openailegacy.ID: {},
anthropic.ID: {},
gemini.ID: {},
bedrock.ID: {},
acp.ID: {},
openrouter.ID: {},
nvidia.ID: {},
opencodego.ID: {},
opencodezen.ID: {},
openaicodex.ID: {},
ollama.ID: {},
ollama.CloudID: {},
llamacpp.ID: {},
lmstudio.ID: {},
vllm.ID: {},
localstub.ID: {},
func isReservedStandardBackendPrefix(prefix string) bool {
_, ok := standardBackendPrefixSet()[prefix]
return ok
}

func standardBackendPrefixSet() map[string]struct{} {
backends := StandardBackendBundle(UpstreamAPIKeys{}).Backends
out := make(map[string]struct{}, len(backends))
for _, entry := range backends {
if IsCustomCompatibleBackendKind(entry.ID) {
continue
}
out[entry.ID] = struct{}{}
}
return out
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}
21 changes: 21 additions & 0 deletions internal/pluginreg/hosted_backend_build_test.go
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Expand Up @@ -7,6 +7,7 @@ import (
"strings"
"testing"

"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/huggingface"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/nvidia"
"github.com/matdev83/go-llm-interactive-proxy/internal/plugins/backends/openairesponses"
"gopkg.in/yaml.v3"
Expand Down Expand Up @@ -56,6 +57,26 @@ func TestBuildBackend_nvidia_envDefaultsWhenYAMLHasNoKeys(t *testing.T) {
}
}

func TestBuildBackend_huggingface_envDefaultsWhenYAMLHasNoKeys(t *testing.T) {
t.Parallel()
reg := NewRegistry()
if err := InstallStandardBackendsOn(reg, UpstreamAPIKeys{HuggingFace: []string{"hf-a", "hf-b"}}); err != nil {
t.Fatal(err)
}
raw := `base_url: https://router.huggingface.co/v1`
var node yaml.Node
if err := yaml.Unmarshal([]byte(raw), &node); err != nil {
t.Fatal(err)
}
b, err := reg.BuildBackend(huggingface.ID, node, nil, BackendFactoryDeps{})
if err != nil {
t.Fatal(err)
}
if b.Open == nil {
t.Fatal("expected backend Open")
}
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}

func TestBuildBackend_openAIResponses_envDefaultsWhenYAMLHasNoKeys(t *testing.T) {
t.Parallel()
reg := NewRegistry()
Expand Down
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