Fix schema and add drift test

cagent-schema.json

@@ -281,6 +281,14 @@
             "type": "string"
           }
         },
+        "add_description_parameter": {
+          "type": "boolean",
+          "description": "Whether to add a 'description' parameter to tool calls, allowing the LLM to provide context about why it is calling a tool"
+        },
+        "skills": {
+          "type": "boolean",
+          "description": "Enable skills discovery for this agent. When enabled, the agent loads skill definitions from well-known directories (~/.codex/skills, ~/.claude/skills, ~/.agents/skills, .claude/skills, .agents/skills) and includes them in the system prompt."
+        },
         "hooks": {
           "$ref": "#/definitions/HooksConfig",
           "description": "Lifecycle hooks for executing shell commands at various points in the agent's execution"
@@ -579,6 +587,14 @@
         "readme": {
           "type": "string",
           "description": "README or description"
+        },
+        "description": {
+          "type": "string",
+          "description": "Description of the agent configuration"
+        },
+        "version": {
+          "type": "string",
+          "description": "Version of the agent configuration (used for OCI registry publishing)"
         }
       },
       "additionalProperties": false

pkg/config/latest/schema_test.go

@@ -0,0 +1,228 @@
+package latest
+
+import (
+	"encoding/json"
+	"os"
+	"reflect"
+	"sort"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// schemaFile is the path to the JSON schema file relative to the repo root.
+const schemaFile = "../../../cagent-schema.json"
+
+// jsonSchema mirrors the subset of JSON Schema we need for comparison.
+type jsonSchema struct {
+	Properties           map[string]jsonSchema `json:"properties,omitempty"`
+	Definitions          map[string]jsonSchema `json:"definitions,omitempty"`
+	Ref                  string                `json:"$ref,omitempty"`
+	Items                *jsonSchema           `json:"items,omitempty"`
+	AdditionalProperties any                   `json:"additionalProperties,omitempty"`
+}
+
+// resolveRef follows a $ref like "#/definitions/Foo" and returns the
+// referenced schema. When no $ref is present it returns the receiver unchanged.
+func (s jsonSchema) resolveRef(root jsonSchema) jsonSchema {
+	if s.Ref == "" {
+		return s
+	}
+	const prefix = "#/definitions/"
+	if !strings.HasPrefix(s.Ref, prefix) {
+		return s
+	}
+	name := strings.TrimPrefix(s.Ref, prefix)
+	if def, ok := root.Definitions[name]; ok {
+		return def
+	}
+	return s
+}
+
+// structJSONFields returns the set of JSON property names declared on a Go
+// struct type via `json:"<name>,…"` tags. Fields tagged with `json:"-"` are
+// excluded. It recurses into anonymous (embedded) struct fields so that
+// promoted fields are included.
+func structJSONFields(t reflect.Type) map[string]bool {
+	if t.Kind() == reflect.Ptr {
+		t = t.Elem()
+	}
+	fields := make(map[string]bool)
+	for i := range t.NumField() {
+		f := t.Field(i)
+
+		// Recurse into anonymous (embedded) structs.
+		if f.Anonymous {
+			for k, v := range structJSONFields(f.Type) {
+				fields[k] = v
+			}
+			continue
+		}
+
+		tag := f.Tag.Get("json")
+		if tag == "" || tag == "-" {
+			continue
+		}
+		name, _, _ := strings.Cut(tag, ",")
+		if name != "" && name != "-" {
+			fields[name] = true
+		}
+	}
+	return fields
+}
+
+// schemaProperties returns the set of property names from a JSON schema
+// definition. It does NOT follow $ref on individual properties – it only
+// looks at the top-level "properties" map.
+func schemaProperties(def jsonSchema) map[string]bool {
+	props := make(map[string]bool, len(def.Properties))
+	for k := range def.Properties {
+		props[k] = true
+	}
+	return props
+}
+
+func sortedKeys(m map[string]bool) []string {
+	keys := make([]string, 0, len(m))
+	for k := range m {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	return keys
+}
+
+// TestSchemaMatchesGoTypes verifies that every JSON-tagged field in the Go
+// config structs has a corresponding property in cagent-schema.json (and
+// vice-versa). This prevents the schema from silently drifting out of sync
+// with the Go types.
+func TestSchemaMatchesGoTypes(t *testing.T) {
+	t.Parallel()
+
+	data, err := os.ReadFile(schemaFile)
+	require.NoError(t, err, "failed to read schema file – run this test from the repo root")
+
+	var root jsonSchema
+	require.NoError(t, json.Unmarshal(data, &root))
+
+	// mapping maps a JSON Schema definition name (or pseudo-name for inline
+	// schemas) to the corresponding Go type. For top-level definitions that
+	// live in the "definitions" section of the schema we use their exact
+	// name. For schemas inlined inside a parent property we use
+	// "Parent.property" as the key.
+	type entry struct {
+		goType     reflect.Type
+		schemaDef  jsonSchema
+		schemaName string // human-readable name for error messages
+	}
+
+	entries := []entry{
+		// Top-level Config
+		{reflect.TypeOf(Config{}), root, "Config (top-level)"},
+	}
+
+	// Definitions that map 1:1 to a Go struct.
+	definitionMap := map[string]reflect.Type{
+		"AgentConfig":           reflect.TypeOf(AgentConfig{}),
+		"FallbackConfig":        reflect.TypeOf(FallbackConfig{}),
+		"ModelConfig":           reflect.TypeOf(ModelConfig{}),
+		"Metadata":              reflect.TypeOf(Metadata{}),
+		"ProviderConfig":        reflect.TypeOf(ProviderConfig{}),
+		"Toolset":               reflect.TypeOf(Toolset{}),
+		"Remote":                reflect.TypeOf(Remote{}),
+		"SandboxConfig":         reflect.TypeOf(SandboxConfig{}),
+		"ScriptShellToolConfig": reflect.TypeOf(ScriptShellToolConfig{}),
+		"PostEditConfig":        reflect.TypeOf(PostEditConfig{}),
+		"PermissionsConfig":     reflect.TypeOf(PermissionsConfig{}),
+		"HooksConfig":           reflect.TypeOf(HooksConfig{}),
+		"HookMatcherConfig":     reflect.TypeOf(HookMatcherConfig{}),
+		"HookDefinition":        reflect.TypeOf(HookDefinition{}),
+		"RoutingRule":           reflect.TypeOf(RoutingRule{}),
+		"ApiConfig":             reflect.TypeOf(APIToolConfig{}),
+	}
+
+	for name, goType := range definitionMap {
+		def, ok := root.Definitions[name]
+		require.True(t, ok, "schema definition %q not found", name)
+		entries = append(entries, entry{goType, def, name})
+	}
+
+	// Inline schemas that don't have their own top-level definition but are
+	// nested inside a parent property.
+	type inlineEntry struct {
+		goType reflect.Type
+		// path navigates from a schema definition to the inline object,
+		// e.g. []string{"RAGConfig", "results"} → definitions.RAGConfig.properties.results
+		path []string
+		name string
+	}
+
+	inlines := []inlineEntry{
+		{reflect.TypeOf(StructuredOutput{}), []string{"AgentConfig", "structured_output"}, "StructuredOutput (AgentConfig.structured_output)"},
+		{reflect.TypeOf(RAGConfig{}), []string{"RAGConfig"}, "RAGConfig"},
+		{reflect.TypeOf(RAGToolConfig{}), []string{"RAGConfig", "tool"}, "RAGToolConfig (RAGConfig.tool)"},
+		{reflect.TypeOf(RAGResultsConfig{}), []string{"RAGConfig", "results"}, "RAGResultsConfig (RAGConfig.results)"},
+		{reflect.TypeOf(RAGFusionConfig{}), []string{"RAGConfig", "results", "fusion"}, "RAGFusionConfig (RAGConfig.results.fusion)"},
+		{reflect.TypeOf(RAGRerankingConfig{}), []string{"RAGConfig", "results", "reranking"}, "RAGRerankingConfig (RAGConfig.results.reranking)"},
+		{reflect.TypeOf(RAGChunkingConfig{}), []string{"RAGConfig", "strategies", "*", "chunking"}, "RAGChunkingConfig (RAGConfig.strategies[].chunking)"},
+	}
+
+	for _, il := range inlines {
+		def := navigateSchema(t, root, il.path)
+		entries = append(entries, entry{il.goType, def, il.name})
+	}
+
+	// Now compare each entry.
+	for _, e := range entries {
+		goFields := structJSONFields(e.goType)
+		schemaProps := schemaProperties(e.schemaDef)
+
+		missingInSchema := diff(goFields, schemaProps)
+		missingInGo := diff(schemaProps, goFields)
+
+		assert.Empty(t, sortedKeys(missingInSchema),
+			"%s: Go struct has JSON fields not present in the schema", e.schemaName)
+		assert.Empty(t, sortedKeys(missingInGo),
+			"%s: schema has properties not present in the Go struct", e.schemaName)
+	}
+}
+
+// navigateSchema walks from a top-level definition through nested properties.
+// path[0] is the definition name; subsequent elements are property names.
+// The special element "*" dereferences an array's "items" schema.
+func navigateSchema(t *testing.T, root jsonSchema, path []string) jsonSchema {
+	t.Helper()
+	require.NotEmpty(t, path)
+
+	cur, ok := root.Definitions[path[0]]
+	require.True(t, ok, "definition %q not found", path[0])
+
+	// Resolve top-level $ref if present.
+	cur = cur.resolveRef(root)
+
+	for _, segment := range path[1:] {
+		if segment == "*" {
+			require.NotNil(t, cur.Items, "expected items schema at %v", path)
+			cur = *cur.Items
+			cur = cur.resolveRef(root)
+			continue
+		}
+		prop, ok := cur.Properties[segment]
+		require.True(t, ok, "property %q not found at %v", segment, path)
+		prop = prop.resolveRef(root)
+		cur = prop
+	}
+	return cur
+}
+
+// diff returns keys present in a but not in b.
+func diff(a, b map[string]bool) map[string]bool {
+	d := make(map[string]bool)
+	for k := range a {
+		if !b[k] {
+			d[k] = true
+		}
+	}
+	return d
+}