return {
  -- copilot
  {
    "zbirenbaum/copilot.lua",
    cmd = { "Copilot" },
    event = { "BufReadPost" },
    build = ":Copilot auth",
    opts = {
      suggestion = {
        enabled = not vim.g.vimrc_use_ai_cmp,
        auto_trigger = true,
        hide_during_competion = vim.g.vimrc_use_ai_cmp,
        keymap = {
          accept = false, -- handled by completin engine
          next = "<Up>",
          prev = "<Down>",
        },
      },
      panel = { enabled = false },
      filetypes = {
        markdown = true,
        help = true,
      },
    },
  },

  -- copilot-language-server
  {
    "neovim/nvim-lspconfig",
    opts = {
      servers = {
        -- copilot.lua only works with its own cpilot lsp server
        copilot = { enabled = false },
      },
    },
  },

  -- add ai_accept action
  {
    "zbirenbaum/copilot.lua",
    opts = function()
      require("rc.utils.cmp").ai_accept = function()
        if require("copilot.suggestion").is_visible() then
          require("rc.utils").create_undo()
          require("copilot.suggestion").accept()
          return true
        end
      end
    end,
  },
  -- Completion engine
  vim.g.vimrc_use_ai_cmp
      and {
        -- copilot source for blink.cmp
        {
          "saghen/blink.cmp",
          optional = true,
          dependencies = { "giuxtaposition/blink-cmp-copilot" },
          opts = {
            sources = {
              default = { "copilot" },
              providers = {
                copilot = {
                  name = "copilot",
                  module = "blink-cmp-copilot",
                  kind = "Copilot",
                  score_offset = 100,
                  async = true,
                },
              },
            },
          },
        },
      }
    or nil,
}