return {
	"olimorris/codecompanion.nvim",
	version = "^19.0.0",
	dependencies = {
		"nvim-lua/plenary.nvim",
		"nvim-treesitter/nvim-treesitter",
	},
	opts = {
		adapters = {
			acp = {
				hermes = function()
					local adapter = require("codecompanion.adapters").extend("codex", {
						name = "hermes",
						formatted_name = "Hermes",
						commands = {
							default = {
								vim.fn.exepath("hermes") ~= "" and vim.fn.exepath("hermes") or "hermes",
								"acp",
							},
						},
						defaults = {
							auth_method = "openai-codex",
							timeout = 20000,
							mcpServers = {},
						},
					})

					-- Hermes resolves credentials from its own configuration.
					adapter.env = {}
					return adapter
				end,
				extend = {
					codex = {
						defaults = {
							auth_method = "chat-gpt",
						},
					},
				},
			},
			http = {
				extend = {
					openai_responses = {
						schema = {
							model = {
								default = "gpt-5.6-terra",
							},
						},
					},
				},
				openai_terra = function()
					return require("codecompanion.adapters").extend("openai_responses", {
						name = "openai_terra",
						formatted_name = "OpenAI: GPT-5.6 Terra",
						schema = {
							model = {
								default = "gpt-5.6-terra",
							},
						},
					})
				end,
				openai_luna = function()
					return require("codecompanion.adapters").extend("openai_responses", {
						name = "openai_luna",
						formatted_name = "OpenAI: GPT-5.6 Luna",
						schema = {
							model = {
								default = "gpt-5.6-luna",
							},
						},
					})
				end,
			},
		},
		interactions = {
			chat = {
				adapter = "hermes",
			},
			inline = {
				adapter = {
					name = "openai_responses",
					model = "gpt-5.6-terra",
				},
			},
		},
	},
}