chore: move metadata field to tooldef struct

pkg/types/tool.go

@@ -157,16 +157,16 @@ func (p Parameters) ToolRefNames() []string {
 
 type ToolDef struct {
 	Parameters   `json:",inline"`
-	Instructions string      `json:"instructions,omitempty"`
-	BuiltinFunc  BuiltinFunc `json:"-"`
+	Instructions string            `json:"instructions,omitempty"`
+	BuiltinFunc  BuiltinFunc       `json:"-"`
+	MetaData     map[string]string `json:"metaData,omitempty"`
 }
 
 type Tool struct {
 	ToolDef `json:",inline"`
 
 	ID          string                     `json:"id,omitempty"`
 	ToolMapping map[string][]ToolReference `json:"toolMapping,omitempty"`
-	MetaData    map[string]string          `json:"metaData,omitempty"`
 	LocalTools  map[string]string          `json:"localTools,omitempty"`
 	Source      ToolSource                 `json:"source,omitempty"`
 	WorkingDir  string                     `json:"workingDir,omitempty"`
@@ -489,6 +489,21 @@ func (t ToolDef) String() string {
 		_, _ = fmt.Fprintln(buf, t.Instructions)
 	}
 
+	if t.Name != "" {
+		keys := maps.Keys(t.MetaData)
+		sort.Strings(keys)
+		for _, key := range keys {
+			buf.WriteString("---\n")
+			buf.WriteString("!metadata:")
+			buf.WriteString(t.Name)
+			buf.WriteString(":")
+			buf.WriteString(key)
+			buf.WriteString("\n")
+			buf.WriteString(t.MetaData[key])
+			buf.WriteString("\n")
+		}
+	}
+
 	return buf.String()
 }
 

pkg/types/tool_test.go

@@ -36,6 +36,13 @@ func TestToolDef_String(t *testing.T) {
 			ExportCredentials:   []string{"ExportCredential1", "ExportCredential2"},
 			Type:                ToolTypeContext,
 		},
+		MetaData: map[string]string{
+			"package.json": `{
+// blah blah some ugly JSON
+}
+`,
+			"requirements.txt": `requests=5`,
+		},
 		Instructions: "This is a sample instruction",
 	}
 
@@ -68,6 +75,15 @@ Share Credential: ExportCredential2
 Chat: true
 
 This is a sample instruction
+---
+!metadata:Tool Sample:package.json
+{
+// blah blah some ugly JSON
+}
+
+---
+!metadata:Tool Sample:requirements.txt
+requests=5
 `).Equal(t, tool.String())
 }