feat(schema): add ValidateEnums for --validate path

internal/api/client.go

@@ -207,6 +207,9 @@ func (c *Client) Run(ctx context.Context, model string, args []string, opts RunO
 		if err := schema.ValidateAllOf(reqSchema, payload); err != nil {
 			return nil, err
 		}
+		if err := schema.ValidateEnums(reqSchema, payload); err != nil {
+			return nil, err
+		}
 	}
 
 	// Resolve delivery method: payload value > opts override > schema default.
@@ -232,10 +235,7 @@ func (c *Client) Run(ctx context.Context, model string, args []string, opts RunO
 			opts.OnSubmit(taskUUID)
 		}
 		interval := opts.PollInterval
-		minResults := extractInt(payload, "numberResults")
-		if minResults < 1 {
-			minResults = 1
-		}
+		minResults := max(extractInt(payload, "numberResults"), 1)
 		return c.Poll(ctx, taskUUID, interval, minResults, opts.OnProgress)
 	}
 

internal/schema/schema.go

@@ -7,6 +7,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"slices"
 	"sort"
 	"strconv"
 	"strings"
@@ -172,10 +173,8 @@ func ParseKV(arg string, node Node) (path []string, value any, err error) {
 	}
 
 	segments := strings.Split(k, ".")
-	for _, seg := range segments {
-		if seg == "" {
-			return nil, nil, fmt.Errorf("key contains empty segment (got %q)", arg)
-		}
+	if slices.Contains(segments, "") {
+		return nil, nil, fmt.Errorf("key contains empty segment (got %q)", arg)
 	}
 
 	segments = normalisePathSegments(segments, node)
@@ -438,6 +437,77 @@ func ValidateAllOf(node Node, payload map[string]any) error {
 	return nil
 }
 
+// ValidateEnums checks that every string value in payload that maps to a
+// schema property with a string-enum constraint (oneOf consts or direct enum)
+// is one of the allowed values. It recurses into nested objects and arrays.
+func ValidateEnums(node Node, payload map[string]any) error {
+	return validateEnumsInObject(node, payload, "")
+}
+
+func validateEnumsInObject(node Node, obj map[string]any, prefix string) error {
+	for key, val := range obj {
+		prop, ok := node.Properties[key]
+		if !ok {
+			continue
+		}
+		path := key
+		if prefix != "" {
+			path = prefix + "." + key
+		}
+		if err := validateEnumsInValue(prop, val, path); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func validateEnumsInValue(prop Node, val any, path string) error {
+	switch v := val.(type) {
+	case string:
+		if allowed := stringEnumValues(prop); len(allowed) > 0 {
+			if !slices.Contains(allowed, v) {
+				return fmt.Errorf("invalid value for %q: must be one of: %s", path, strings.Join(allowed, ", "))
+			}
+		}
+	case map[string]any:
+		if err := validateEnumsInObject(prop, v, path); err != nil {
+			return err
+		}
+	case []any:
+		if prop.Items != nil {
+			for i, item := range v {
+				if err := validateEnumsInValue(*prop.Items, item, fmt.Sprintf("%s.%d", path, i)); err != nil {
+					return err
+				}
+			}
+		}
+	}
+	return nil
+}
+
+// stringEnumValues returns the allowed string values for a string-typed schema
+// node, collecting string const values from oneOf branches and direct enum
+// entries. Returns nil when the node has no string enum constraint.
+func stringEnumValues(prop Node) []string {
+	var vals []string
+	for i := range prop.OneOf {
+		if len(prop.OneOf[i].Const) == 0 {
+			continue
+		}
+		var s string
+		if err := json.Unmarshal(prop.OneOf[i].Const, &s); err == nil {
+			vals = append(vals, s)
+		}
+	}
+	for _, raw := range prop.Enum {
+		var s string
+		if err := json.Unmarshal(raw, &s); err == nil {
+			vals = append(vals, s)
+		}
+	}
+	return vals
+}
+
 func checkDependentRequired(depReq map[string][]string, payload map[string]any) error {
 	triggers := make([]string, 0, len(depReq))
 	for k := range depReq {

internal/schema/schema_test.go

@@ -20,6 +20,9 @@ const (
 	testFieldText           = "text"
 	testFieldRole           = "role"
 	testFieldContent        = "content"
+	testFieldSettings       = "settings"
+	testFieldStyle          = "style"
+	testFieldThinking       = "thinking"
 	testValHello            = "Hello"
 	testValUser             = "user"
 	testMsg0Role            = "messages.0.role"
@@ -376,7 +379,7 @@ func TestParseKV_DotNotation_ArrayAutoIndex(t *testing.T) {
 func TestParseKV_DotNotation_NestedObjectCoercesType(t *testing.T) {
 	node := schema.Node{
 		Properties: map[string]schema.Node{
-			"settings": {
+			testFieldSettings: {
 				Type: schema.TypeObject,
 				Properties: map[string]schema.Node{
 					"maxTokens": {Type: schema.TypeInteger},
@@ -388,14 +391,160 @@ func TestParseKV_DotNotation_NestedObjectCoercesType(t *testing.T) {
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
-	if len(path) != 2 || path[0] != "settings" || path[1] != "maxTokens" {
+	if len(path) != 2 || path[0] != testFieldSettings || path[1] != "maxTokens" {
 		t.Errorf("path: want [settings maxTokens], got %v", path)
 	}
 	if v != int64(512) {
 		t.Errorf("value: want int64(512), got %v (%T)", v, v)
 	}
 }
 
+func TestParseKV_StringNoEnum_AnyValueAccepted(t *testing.T) {
+	node := schema.Node{
+		Properties: map[string]schema.Node{
+			testFieldPositivePrompt: {Type: schema.TypeString},
+		},
+	}
+	_, v, err := schema.ParseKV("positivePrompt=any value goes", node)
+	if err != nil {
+		t.Fatalf("unexpected error for string field with no enum: %v", err)
+	}
+	if v != "any value goes" {
+		t.Errorf("want 'any value goes', got %v", v)
+	}
+}
+
+func TestParseKV_StringEnum_PassthroughWithoutValidate(t *testing.T) {
+	// ParseKV does not validate enum constraints — that is deferred to
+	// ValidateEnums (--validate path). An invalid value is coerced as-is.
+	node := schema.Node{
+		Properties: map[string]schema.Node{
+			testFieldThinking: {
+				Type: schema.TypeString,
+				OneOf: []schema.Node{
+					{Const: json.RawMessage(`"enabled"`)},
+					{Const: json.RawMessage(`"disabled"`)},
+				},
+			},
+		},
+	}
+	_, v, err := schema.ParseKV(testFieldThinking+"=true", node)
+	if err != nil {
+		t.Fatalf("ParseKV must not validate enums: %v", err)
+	}
+	if v != "true" {
+		t.Errorf("want string 'true' passed through, got %v", v)
+	}
+}
+
+// ---- ValidateEnums tests ----
+
+func thinkingNode() schema.Node {
+	return schema.Node{
+		Properties: map[string]schema.Node{
+			testFieldSettings: {
+				Type: schema.TypeObject,
+				Properties: map[string]schema.Node{
+					testFieldThinking: {
+						Type: schema.TypeString,
+						OneOf: []schema.Node{
+							{Const: json.RawMessage(`"enabled"`)},
+							{Const: json.RawMessage(`"disabled"`)},
+							{Const: json.RawMessage(`"auto"`)},
+						},
+					},
+				},
+			},
+		},
+	}
+}
+
+func TestValidateEnums_ValidNestedOneOf(t *testing.T) {
+	payload := map[string]any{
+		testFieldSettings: map[string]any{testFieldThinking: "enabled"},
+	}
+	if err := schema.ValidateEnums(thinkingNode(), payload); err != nil {
+		t.Errorf("unexpected error for valid enum value: %v", err)
+	}
+}
+
+func TestValidateEnums_InvalidNestedOneOf(t *testing.T) {
+	payload := map[string]any{
+		testFieldSettings: map[string]any{testFieldThinking: "true"},
+	}
+	err := schema.ValidateEnums(thinkingNode(), payload)
+	if err == nil {
+		t.Fatal("expected error for invalid enum value 'true'")
+	}
+	for _, want := range []string{"enabled", "disabled", "auto"} {
+		if !containsString(err.Error(), want) {
+			t.Errorf("error should list allowed value %q; got: %v", want, err)
+		}
+	}
+}
+
+func TestValidateEnums_ValidDirectEnum(t *testing.T) {
+	node := schema.Node{
+		Properties: map[string]schema.Node{
+			testFieldStyle: {
+				Type: schema.TypeString,
+				Enum: []json.RawMessage{
+					json.RawMessage(`"anime"`),
+					json.RawMessage(`"cyberpunk"`),
+				},
+			},
+		},
+	}
+	payload := map[string]any{testFieldStyle: "anime"}
+	if err := schema.ValidateEnums(node, payload); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+}
+
+func TestValidateEnums_InvalidDirectEnum(t *testing.T) {
+	node := schema.Node{
+		Properties: map[string]schema.Node{
+			testFieldStyle: {
+				Type: schema.TypeString,
+				Enum: []json.RawMessage{
+					json.RawMessage(`"anime"`),
+					json.RawMessage(`"cyberpunk"`),
+				},
+			},
+		},
+	}
+	payload := map[string]any{testFieldStyle: "realistic"}
+	err := schema.ValidateEnums(node, payload)
+	if err == nil {
+		t.Fatal("expected error for value not in enum")
+	}
+	if !containsString(err.Error(), "anime") || !containsString(err.Error(), "cyberpunk") {
+		t.Errorf("error should list allowed values; got: %v", err)
+	}
+}
+
+func TestValidateEnums_NoConstraint_Passes(t *testing.T) {
+	node := schema.Node{
+		Properties: map[string]schema.Node{
+			testFieldPositivePrompt: {Type: schema.TypeString},
+		},
+	}
+	if err := schema.ValidateEnums(node, map[string]any{testFieldPositivePrompt: "any text"}); err != nil {
+		t.Errorf("unexpected error for unconstrained string: %v", err)
+	}
+}
+
+func TestValidateEnums_UnknownKeyIgnored(t *testing.T) {
+	node := schema.Node{
+		Properties: map[string]schema.Node{
+			"known": {Type: schema.TypeString},
+		},
+	}
+	if err := schema.ValidateEnums(node, map[string]any{"unknown": "whatever"}); err != nil {
+		t.Errorf("unexpected error for key not in schema: %v", err)
+	}
+}
+
 func TestParseKV_EmptySegment(t *testing.T) {
 	_, _, err := schema.ParseKV("speech..text=Hello", schema.Node{})
 	if err == nil {