Function replyToDiscussionComment

pkg/github/discussions.go:760–857

(ctx context.Context, client *githubv4.Client, args map[string]any)

}

func replyToDiscussionComment(ctx context.Context, client *githubv4.Client, args map[string]any) (*mcp.CallToolResult, any, error) {
	commentNodeID, err := requiredCommentNodeID(args)
	if err != nil {
		return utils.NewToolResultError(err.Error()), nil, nil
	}

	owner, err := RequiredParam[string](args, "owner")
	if err != nil {
		return utils.NewToolResultError(err.Error()), nil, nil
	}
	repo, err := RequiredParam[string](args, "repo")
	if err != nil {
		return utils.NewToolResultError(err.Error()), nil, nil
	}
	discussionNumber, err := RequiredInt(args, "discussionNumber")
	if err != nil {
		return utils.NewToolResultError(err.Error()), nil, nil
	}
	body, err := RequiredParam[string](args, "body")
	if err != nil {
		return utils.NewToolResultError(err.Error()), nil, nil
	}

	// The GitHub API silently ignores an invalid ReplyToID and creates a top-level
	// comment instead of returning an error, so we validate upfront that the node
	// exists and is a DiscussionComment to give callers a clear failure.
	var nodeQuery struct {
		Node struct {
			DiscussionComment struct {
				ID         *githubv4.ID
				Discussion struct {
					ID githubv4.ID
				} `graphql:"discussion"`
			} `graphql:"... on DiscussionComment"`
		} `graphql:"node(id: $replyToID)"`
	}
	if err := client.Query(ctx, &nodeQuery, map[string]any{
		"replyToID": githubv4.ID(commentNodeID),
	}); err != nil {
		return utils.NewToolResultError(fmt.Sprintf("failed to validate commentNodeID: %v", err)), nil, nil
	}
	if nodeQuery.Node.DiscussionComment.ID == nil || *nodeQuery.Node.DiscussionComment.ID == "" {
		return utils.NewToolResultError(fmt.Sprintf("commentNodeID %q does not resolve to a valid discussion comment", commentNodeID)), nil, nil
	}

	// Get the discussion's node ID using its number
	var q struct {
		Repository struct {
			Discussion struct {
				ID githubv4.ID
			} `graphql:"discussion(number: $discussionNumber)"`
		} `graphql:"repository(owner: $owner, name: $repo)"`
	}
	vars := map[string]any{
		"owner":            githubv4.String(owner),
		"repo":             githubv4.String(repo),
		"discussionNumber": githubv4.Int(discussionNumber), // #nosec G115 - discussion numbers are always small positive integers
	}