MCPHub slash commands and resources not working with LazyVim

[ShooTeX]

@mcp works fine and successfully communicates with MCPHub, but for some reason, it doesn't display MCPHub's slash commands or resources.

Everything works 100% when using minimal.lua, so I’m guessing it's something in my config but I’m not sure where to look. I'm currently using the default LazyVim Blink configuration.

Any ideas on what might be causing this?

My plugin setup for CodeCompanion:

return {
  "olimorris/codecompanion.nvim",
  dependencies = {
    "nvim-lua/plenary.nvim",
    "nvim-treesitter/nvim-treesitter",
    "ravitemer/mcphub.nvim",
  },
  opts = {
    extensions = {
      mcphub = {
        callback = "mcphub.extensions.codecompanion",
        opts = {
          make_vars = true,
          make_slash_commands = true,
          show_result_in_chat = true,
        },
      },
    },
  },
  keys = {
    { "<leader>a", "", desc = "+ai", mode = { "n", "v" } },
    {
      "<leader>aa",
      function()
        vim.cmd("CodeCompanionChat Toggle")
      end,
      desc = "Toggle (AiChat)",
      mode = { "n", "v" },
    },
    {
      "<leader>ap",
      function()
        vim.cmd("CodeCompanionActions")
      end,
      desc = "Ai Prompt",
      mode = { "n", "v" },
    },
  },
}

and MCPHub:

return {
  "ravitemer/mcphub.nvim",
  dependencies = {
    "nvim-lua/plenary.nvim",
  },
  build = "bun add -g mcp-hub@latest", -- Installs `mcp-hub` node binary globally
  config = function()
    require("mcphub").setup()
  end,
}

[ravitemer]

@ShooTeX Can you share your servers.json? Does any of the servers provide resources or prompts?

[ShooTeX]

yeah, everything else seems to be fine

[ravitemer]

Will try and see if adding variables and slash commands dynamically might be causing it! You can try adding a custom test variable somewhere after codecompanion.setup is called to config.strategies.chat.variables table and see if it is shown in the chat buffer.

@olimorris Do you have any idea?

[ravitemer]

@ShooTeX Can you add this code to some lua file and call :luafile %

require("codecompanion.config").strategies.chat.variables.test = {
	description = "Dynamically added var",
}

Then open the chat buffer and see if #test is available or not? This should debug if it is something to do with dynamically added vars or slash commands

[ShooTeX]

seems to be working fine:

[ravitemer]

Okay. Thanks

Can you go to mcphub.nvim directory where lazy installed it and go to extensions/codecompanion/utils.lua.

Then add some vim.notify inside setup variables and setup slash commands functions? Sorry for the formatting, on my mobile.

---@param opts MCPHubCodeCompanionConfig
function M.setup_codecompanion_slash_commands(opts)
    if not opts.make_slash_commands then
        return
    end

    local mcphub = require("mcphub")
    local config = require("codecompanion.config")
    --setup event listners to update variables, tools etc
    mcphub.on({ "servers_updated", "prompt_list_changed" }, function(_)
        local hub = mcphub.get_hub_instance()
        if not hub then
            return
        end
        local prompts = hub:get_prompts()
        local slash_co

Add them inside the on listener to see if it is triggering or not.

[ShooTeX]

    mcphub.on({ "servers_updated", "prompt_list_changed" }, function(_)
        vim.notify("Updating slash commands", vim.log.levels.ERROR)

this triggers notifications when I enable/disable mcp servers (twice for each action) and when the chat is open. Somehow after enabling/disabling a server a couple of times I saw slash commands, but I can't reproduce it anymore

[ravitemer]

but blink still doesn't show them.

Don't know much about blink though. Some other plugin might be interfering with it? I'm not sure. Maybe use nvim-cmp?

[ShooTeX]

nvim-cmp does kind of work, but not initially, I have to change something in MCPHub to see the slash commands.

also tried to disable every lazyvim extra and custom plugin I have, no success though

[ravitemer]

Thinking out loud:

As mcphub is declared as dependency of codecompanion the mcphub.setup will be called which will start native servers as well as real ones. Native servers don't emit the servers_updated or list_changed events. This might be a problem if user doesn't setup any real MCP server? We can see if on listener is triggered or not with vim.notify. From what you said earlier it is also not being triggered at the start. If so, we need to let native servers also emit the events.

Do you have any real MCP servers configured? If not can you please go to marketplace and install any server? Maybe fetch or time and tey and see if they appear at the start without tweaking the hub UI?

[ShooTeX]

I figured it out 🤦 ,

I added lazy = false to both mcphub and code companion:

return {
  "olimorris/codecompanion.nvim",
  lazy = false,
  dependencies = {
    "nvim-lua/plenary.nvim",
    "nvim-treesitter/nvim-treesitter",
    "ravitemer/mcphub.nvim",
  },
  opts = {
    extensions = {
      mcphub = {
        callback = "mcphub.extensions.codecompanion",
        opts = {
          make_vars = true,
          make_slash_commands = true,
          show_result_in_chat = true,
        },
      },
    },
  },
  keys = {
    { "<leader>a", "", desc = "+ai", mode = { "n", "v" } },
    {
      "<leader>aa",
      function()
        vim.cmd("CodeCompanionChat Toggle")
      end,
      desc = "Toggle (AiChat)",
      mode = { "n", "v" },
    },
    {
      "<leader>ap",
      function()
        vim.cmd("CodeCompanionActions")
      end,
      desc = "Ai Prompt",
      mode = { "n", "v" },
    },
  },
}

return {
  "ravitemer/mcphub.nvim",
  dependencies = {
    "nvim-lua/plenary.nvim",
  },
  lazy = false,
  build = "bun add -g mcp-hub@latest", -- Installs `mcp-hub` node binary globally
  config = function()
    require("mcphub").setup()
  end,
}

and now it seems to work, really sorry for this dumb issue as I have no idea how lazyvim is lazy loading plugins 😅

[ravitemer]

Does it lazy load them by default?

Anyways, glad it worked! 😂

[ShooTeX]

Afaik it shouldn't, but it worked with the lazy = false flag. Not enough knowledge about lazyvim I guess 😅

thanks for helping me debug 🙏