Function extractToolsFromFrontmatter

pkg/parser/content_extractor.go:60–94

extractToolsFromFrontmatter extracts tools and mcp-servers sections from an already-parsed frontmatter map as a JSON string. This avoids re-parsing YAML when the frontmatter has already been parsed, which is the common case for imported files (both builtin and local).

(frontmatter map[string]any)

// frontmatter map as a JSON string. This avoids re-parsing YAML when the frontmatter has
// already been parsed, which is the common case for imported files (both builtin and local).
func extractToolsFromFrontmatter(frontmatter map[string]any) (string, error) {
	// Create a map to hold the merged result
	extracted := make(map[string]any)

	// Helper function to merge a field into extracted map.
	// Non-map values (e.g. arrays in custom-agent format) are skipped here;
	// schema validation elsewhere will report them as invalid if appropriate.
	mergeField := func(fieldName string) {
		if fieldValue, exists := frontmatter[fieldName]; exists {
			if fieldMap, ok := fieldValue.(map[string]any); ok {
				maps.Copy(extracted, fieldMap)
			}
		}
	}

	// Extract and merge tools section (tools are stored as tool_name: tool_config)
	mergeField("tools")

	// Extract and merge mcp-servers section (mcp-servers are stored as server_name: server_config)
	mergeField("mcp-servers")

	// If nothing was extracted, return empty object
	if len(extracted) == 0 {
		return "{}", nil
	}

	// Convert to JSON string. On marshal failure, return an empty object to
	// match the behaviour of extractToolsFromContent (defensive, not a hard error).
	extractedJSON, err := json.Marshal(extracted)
	if err != nil {
		return "{}", nil
	}

	return strings.TrimSpace(string(extractedJSON)), nil
}

// extractFrontmatterField extracts a specific field from frontmatter as JSON string
func extractFrontmatterField(content, fieldName, emptyValue string) (string, error) {