2 files changed, 60 insertions, 0 deletions
diff --git a/internal/config/config.go b/internal/config/config.go
index 80777ff..640e933 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -63,6 +63,20 @@ func (r RunnersConfig) GeminiEnabled() bool    { return r.Gemini == nil || *r.Ge
 func (r RunnersConfig) LocalEnabled() bool     { return r.Local == nil || *r.Local }
 func (r RunnersConfig) ContainerEnabled() bool { return r.Container == nil || *r.Container }
 
+// ProviderConfig configures a native (or OpenAI-compatible) LLM provider
+// backend for the multi-provider harness — see docs/api-keys-setup.md. Phase
+// 1 only adds this type so config has somewhere for it to land; it is not yet
+// read by runner construction (no native provider adapters exist yet besides
+// the openaicompat one LocalModel already configures). Keyed by provider name
+// in the [providers.<name>] TOML table, e.g. [providers.groq],
+// [providers.anthropic].
+type ProviderConfig struct {
+	Endpoint       string `toml:"endpoint"`
+	APIKey         string `toml:"api_key"`
+	DefaultModel   string `toml:"default_model"`
+	TimeoutSeconds int    `toml:"timeout_seconds"`
+}
+
 type Config struct {
 	DataDir          string        `toml:"data_dir"`
 	DBPath           string        `toml:"-"`
@@ -89,6 +103,9 @@ type Config struct {
 	LocalModel       LocalModel    `toml:"local_model"`
 	Runners          RunnersConfig `toml:"runners"`
 	Budget           BudgetConfig  `toml:"budget"`
+	// Providers configures native/OpenAI-compatible LLM backends by name (see
+	// ProviderConfig). Unused by runner construction in Phase 1.
+	Providers map[string]ProviderConfig `toml:"providers"`
 	// ExternalBindAllowed must be explicitly true to bind a non-loopback address.
 	ExternalBindAllowed bool `toml:"external_bind_allowed"`
 }
diff --git a/internal/config/config_test.go b/internal/config/config_test.go
index 0d47ca0..6991354 100644
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -165,3 +165,46 @@ func TestLocalModel_UseForElaborate_ExplicitTrue(t *testing.T) {
 		t.Error("explicit true should opt in")
 	}
 }
+
+func TestProvidersConfig_TOMLRoundTrip(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "config.toml")
+	toml := `
+[providers.groq]
+endpoint = "https://api.groq.com/openai/v1"
+api_key = "gsk_abc"
+default_model = "llama-3.3-70b-versatile"
+timeout_seconds = 30
+
+[providers.anthropic]
+api_key = "sk-ant-xyz"
+default_model = "claude-sonnet-4-5"
+`
+	if err := os.WriteFile(path, []byte(toml), 0600); err != nil {
+		t.Fatal(err)
+	}
+	t.Setenv("HOME", dir)
+
+	cfg, err := LoadFile(path)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(cfg.Providers) != 2 {
+		t.Fatalf("expected 2 providers, got %d: %+v", len(cfg.Providers), cfg.Providers)
+	}
+	groq, ok := cfg.Providers["groq"]
+	if !ok {
+		t.Fatal("expected [providers.groq] table")
+	}
+	if groq.Endpoint != "https://api.groq.com/openai/v1" || groq.APIKey != "gsk_abc" ||
+		groq.DefaultModel != "llama-3.3-70b-versatile" || groq.TimeoutSeconds != 30 {
+		t.Errorf("groq provider config: %+v", groq)
+	}
+	anthropic, ok := cfg.Providers["anthropic"]
+	if !ok {
+		t.Fatal("expected [providers.anthropic] table")
+	}
+	if anthropic.Endpoint != "" || anthropic.APIKey != "sk-ant-xyz" || anthropic.DefaultModel != "claude-sonnet-4-5" {
+		t.Errorf("anthropic provider config: %+v", anthropic)
+	}
+}