diff --git a/lua/tiny-debugger/adapters/lua.lua b/lua/tiny-debugger/adapters/lua.lua
index a564707..26219b1 100644
--- a/lua/tiny-debugger/adapters/lua.lua
+++ b/lua/tiny-debugger/adapters/lua.lua
@@ -1 +1,25 @@
-return {}
+local loader = require("tiny-debugger.adapters.init")
+
+local M = {}
+
+function M.register(dap)
+  -- osv (one-small-step-for-vimkind) is optional — skip gracefully if not installed
+  local ok, osv = pcall(require, "osv")
+  if not ok then return end
+
+  loader.register(dap, "nlua", {
+    type = "server",
+    host = "127.0.0.1",
+    port = function()
+      return osv.launch({ port = 0 })
+    end,
+  }, {
+    {
+      type = "nlua",
+      request = "attach",
+      name = "Attach to running Neovim",
+    },
+  }, { "lua" })
+end
+
+return M
diff --git a/lua/tiny-debugger/adapters/php.lua b/lua/tiny-debugger/adapters/php.lua
index a564707..568dc5e 100644
--- a/lua/tiny-debugger/adapters/php.lua
+++ b/lua/tiny-debugger/adapters/php.lua
@@ -1 +1,22 @@
-return {}
+local loader = require("tiny-debugger.adapters.init")
+
+local M = {}
+
+function M.register(dap)
+  local php_debug = loader.find_executable({ "php-debug-adapter" })
+  if not php_debug then return end
+
+  loader.register(dap, "php", {
+    type = "executable",
+    command = php_debug,
+  }, {
+    {
+      type = "php",
+      request = "launch",
+      name = "Listen for Xdebug",
+      port = 9003,
+    },
+  }, { "php" })
+end
+
+return M
diff --git a/lua/tiny-debugger/adapters/ruby.lua b/lua/tiny-debugger/adapters/ruby.lua
index a564707..29b5fc6 100644
--- a/lua/tiny-debugger/adapters/ruby.lua
+++ b/lua/tiny-debugger/adapters/ruby.lua
@@ -1 +1,33 @@
-return {}
+local loader = require("tiny-debugger.adapters.init")
+
+local M = {}
+
+function M.register(dap)
+  local rdbg = loader.find_executable({ "rdbg" })
+  if not rdbg then return end
+
+  loader.register(dap, "rdbg", {
+    type = "server",
+    port = "${port}",
+    executable = {
+      command = rdbg,
+      args = { "-n", "--open", "--port", "${port}", "-c", "--", "ruby", "${file}" },
+    },
+  }, {
+    {
+      type = "rdbg",
+      request = "launch",
+      name = "Launch file",
+      command = "ruby",
+      script = "${file}",
+    },
+    {
+      type = "rdbg",
+      request = "attach",
+      name = "Attach",
+      localfsMap = "${workspaceFolder}",
+    },
+  }, { "ruby" })
+end
+
+return M