wip

Author: olimorris

lua/codecompanion/adapters/http/anthropic.lua

@@ -2,6 +2,7 @@ local adapter_utils = require("codecompanion.utils.adapters")
 local log = require("codecompanion.utils.log")
 local transform = require("codecompanion.utils.tool_transformers")
 
+
 ---@class CodeCompanion.HTTPAdapter.Anthropic: CodeCompanion.HTTPAdapter
 return {
   name = "anthropic",
@@ -15,7 +16,7 @@ return {
     text = true,
   },
   opts = {
-    context_management = true,
+    -- context_management = true,
     stream = true,
     tools = true,
     vision = true,
@@ -39,8 +40,7 @@ return {
       ---@param self CodeCompanion.HTTPAdapter.Anthropic
       ---@param meta { tools: table }
       callback = function(self, meta)
-        local beta = self.headers["anthropic-beta"]
-        self.headers["anthropic-beta"] = (beta and (beta .. ",") or "") .. "code-execution-2025-08-25"
+        adapter_utils.add_header(self.headers, "anthropic-beta", "code-execution-2025-08-25")
 
         table.insert(meta.tools, {
           type = "code_execution_20250825",
@@ -53,8 +53,7 @@ return {
       ---@param self CodeCompanion.HTTPAdapter.Anthropic
       ---@param meta { tools: table }
       callback = function(self, meta)
-        local beta = self.headers["anthropic-beta"]
-        self.headers["anthropic-beta"] = (beta and (beta .. ",") or "") .. "context-management-2025-06-27"
+        adapter_utils.add_header(self.headers, "anthropic-beta", "context-management-2025-06-27")
 
         table.insert(meta.tools, {
           type = "memory_20250818",
@@ -71,8 +70,7 @@ return {
       ---@param self CodeCompanion.HTTPAdapter.Anthropic
       ---@param meta { tools: table }
       callback = function(self, meta)
-        local beta = self.headers["anthropic-beta"]
-        self.headers["anthropic-beta"] = (beta and (beta .. ",") or "") .. "web-fetch-2025-09-10"
+        adapter_utils.add_header(self.headers, "anthropic-beta", "web-fetch-2025-09-10")
 
         table.insert(meta.tools, {
           type = "web_fetch_20250910",
@@ -114,21 +112,18 @@ return {
 
       -- Add the extended output header if enabled
       if self.temp.extended_output then
-        local beta = self.headers["anthropic-beta"]
-        self.headers["anthropic-beta"] = (beta and (beta .. ",") or "") .. "output-128k-2025-02-19"
+        adapter_utils.add_header(self.headers, "anthropic-beta", "output-128k-2025-02-19")
       end
 
       -- Ref: https://docs.anthropic.com/en/docs/build-with-claude/tool-use/token-efficient-tool-use
       if self.opts.has_token_efficient_tools then
-        local beta = self.headers["anthropic-beta"]
-        self.headers["anthropic-beta"] = (beta and (beta .. ",") or "") .. "token-efficient-tools-2025-02-19"
+        adapter_utils.add_header(self.headers, "anthropic-beta", "token-efficient-tools-2025-02-19")
       end
 
       -- Ref: https://platform.claude.com/docs/en/build-with-claude/context-editing#tool-result-clearing-usage
-      if self.opts.context_management then
-        local beta = self.headers["anthropic-beta"]
-        self.headers["anthropic-beta"] = (beta and (beta .. ",") or "") .. "context-management-2025-06-27"
-      end
+      -- if self.opts.context_management then
+      --   adapter_utils.add_header(self.headers, "anthropic-beta", "context-management-2025-06-27")
+      -- end
 
       return true
     end,
@@ -322,39 +317,46 @@ return {
         end
       end
 
-      local context_management = nil
-      if self.opts.context_management then
-        context_management = {
-          ["edits"] = {
-            {
-              type = "clear_thinking_20251015",
-              keep = {
-                type = "thinking_turns",
-                value = 3,
-              },
-            },
-            {
-              type = "clear_tool_uses_20250919",
-              keep = {
-                type = "tool_uses",
-                value = 5,
-              },
-              trigger = {
-                type = "input_tokens",
-                value = 50000,
-              },
-            },
-          },
-        }
-      end
+      -- local context_management = nil
+      -- if self.opts.context_management then
+      --   context_management = {
+      --     ["edits"] = {
+      --       {
+      --         type = "clear_thinking_20251015",
+      --         keep = {
+      --           type = "thinking_turns",
+      --           value = 3,
+      --         },
+      --       },
+      --       {
+      --         type = "clear_tool_uses_20250919",
+      --         keep = {
+      --           type = "tool_uses",
+      --           value = 5,
+      --         },
+      --         trigger = {
+      --           type = "input_tokens",
+      --           value = 50000,
+      --         },
+      --       },
+      --       -- {
+      --       --   type = "compact_20260112",
+      --       --   trigger = {
+      --       --     type = "input_tokens",
+      --       --     value = 100000,
+      --       --   },
+      --       -- },
+      --     },
+      --   }
+      -- end
 
       -- 11. Enable automatic prompt caching
       -- Ref: https://platform.claude.com/docs/en/build-with-claude/prompt-caching#automatic-caching
       return {
         cache_control = { type = "ephemeral" },
         system = system,
         messages = messages,
-        context_management = context_management,
+        -- context_management = context_management,
       }
     end,
 

lua/codecompanion/adapters/http/init.lua

@@ -111,6 +111,7 @@ end
 
 ---@class CodeCompanion.HTTPAdapter
 ---@field name string The name of the adapter
+---@field vendor? string The vendor of the adapter, e.g. "openai" or "azure"
 ---@field type string|"http" The type of the adapter, e.g. "http" or "acp"
 ---@field formatted_name string The formatted name of the adapter
 ---@field available_tools? table The tools that are available for the adapter
@@ -128,22 +129,25 @@ end
 ---@field handlers CodeCompanion.HTTPAdapter.Handlers Functions which link the output from the request to CodeCompanion
 ---@field meta? { context_window: number } Data about the selected model
 ---@field methods table Methods that the adapter can perform e.g. for Slash Commands
----@field model? { name: string, formatted_name?: string, vendor?: string, opts: table, info?: table } The model to use for the request
+---@field model? { name: string, formatted_name?: string, info?: table, meta?: table, opts: table, vendor?: string } The model to use for the request
 ---@field opts? table Additional options for the adapter
 ---@field schema table Set of parameters for the generative AI service that the user can customise in the chat buffer
 ---@field temp? table A table to store temporary values which are not passed to the request
 
 ---@class CodeCompanion.HTTPAdapter.Safe
 ---@field name string The name of the adapter
----@field model string The current model name
+---@field vendor? string The vendor of the adapter, e.g. "openai" or "azure"
+---@field type string|"http" The type of the adapter, e.g. "http" or "acp"
+---@field model table The current model name
 ---@field available_tools? table The tools that are available for the adapter
 ---@field formatted_name string The formatted name of the adapter
 ---@field features table The features that the adapter supports
 ---@field url string The URL of the generative AI service to connect to
 ---@field headers table The headers to pass to the request
 ---@field parameters table The parameters to pass to the request
----@field opts? table Additional options for the adapter
 ---@field handlers CodeCompanion.HTTPAdapter.Handlers Functions which link the output from the request to CodeCompanion
+---@field opts? table Additional options for the adapter
+---@field meta? table Data about the selected model
 ---@field schema table Set of parameters for the generative AI service that the user can customise in the chat buffer
 
 ---@class CodeCompanion.HTTPAdapter
@@ -281,11 +285,16 @@ function Adapter.set_model(args)
     local model = adapter.schema.model.default
     local choices = adapter.schema.model.choices
 
+    adapter.model.vendor = adapter.vendor or adapter.name
+
     if type(model) == "string" then
       adapter.model.name = model
     end
     if type(choices) == "table" then
       adapter.model.opts = (choices[model] and choices[model].opts) and choices[model].opts
+      adapter.model.meta = (choices[model] and choices[model].meta) and choices[model].meta
+      adapter.model.formatted_name = (choices[model] and choices[model].formatted_name)
+        and choices[model].formatted_name
     end
   end
 
@@ -359,6 +368,7 @@ end
 function Adapter.make_safe(adapter)
   return {
     name = adapter.name,
+    vendor = adapter.vendor,
     type = adapter.type,
     model = adapter.model,
     available_tools = adapter.available_tools,
@@ -367,8 +377,9 @@ function Adapter.make_safe(adapter)
     url = adapter.url,
     headers = adapter.headers,
     parameters = adapter.parameters,
-    opts = adapter.opts,
     handlers = adapter.handlers,
+    opts = adapter.opts,
+    meta = adapter.meta,
     schema = vim
       .iter(adapter.schema)
       :filter(function(n, _)

lua/codecompanion/adapters/http/openai_responses.lua

@@ -24,6 +24,7 @@ end
 ---@class CodeCompanion.HTTPAdapter.OpenAIResponses: CodeCompanion.HTTPAdapter
 return {
   name = "openai_responses",
+  vendor = "openai",
   formatted_name = "OpenAI_Responses",
   roles = {
     llm = "assistant",
@@ -545,7 +546,7 @@ return {
       type = "enum",
       desc = "ID of the model to use. See the model endpoint compatibility table for details on which models work with the Chat API.",
       ---@type string|fun(): string
-      default = "gpt-5-2025-08-07",
+      default = "gpt-5",
       choices = {
         ["gpt-5.4-pro"] = {
           formatted_name = "GPT 5.4 Pro",

lua/codecompanion/config.lua

@@ -82,6 +82,12 @@ local defaults = {
             },
             enabled = true,
           },
+          ["at_token_limit"] = {
+            actions = {
+              "interactions.background.builtin.chat_make_title",
+            },
+            enabled = true,
+          },
         },
         opts = {
           enabled = false, -- Enable ALL background chat interactions?
@@ -664,6 +670,20 @@ If you are providing code changes, use the insert_edit_into_file tool (if availa
         },
       },
       opts = {
+        compaction = {
+          trigger = 0.75, -- Compaction starts at 75% of the context window limit
+          enabled = function(adapter)
+            if adapter.type ~= "http" then
+              return false
+            end
+            -- Anthropic and OpenAI have their own server-side compaction
+            if adapter.vendor and (adapter.vendor == "anthropic" or adapter.vendor == "openai") then
+              return false
+            end
+            return true
+          end,
+        },
+
         blank_prompt = "", -- The prompt to use when the user doesn't provide a prompt
         completion_provider = providers.completion, -- blink|cmp|coc|default
         debounce = 150, -- Time to debounce user input (milliseconds)
@@ -672,9 +692,6 @@ If you are providing code changes, use the insert_edit_into_file tool (if availa
         wait_timeout = 2e6, -- Time to wait for user response before timing out (milliseconds)
         yank_jump_delay_ms = 400, -- Delay before jumping back from the yanked code (milliseconds )
 
-        -- What to do when an ACP permission request times out? (allow_once|reject_once)
-        acp_timeout_response = "reject_once",
-
         ---@type string|fun(path: string)
         goto_file_action = ui_utils.tabnew_reuse,
 

lua/codecompanion/interactions/chat/init.lua

@@ -610,6 +610,9 @@ function Chat.new(args)
   self:add_callback("on_ready", function(c)
     c.subscribers:process(c)
   end)
+  self:add_callback("at_token_limit", function(c)
+    c.subscribers:process(c)
+  end)
   self:add_callback("on_cancelled", function(c)
     c.subscribers:stop()
   end)

lua/codecompanion/utils/adapters.lua

@@ -357,6 +357,26 @@ function M.set_env_vars(adapter, object)
   end
 end
 
+---Add a value to a comma-separated header without duplicating existing values
+---@param headers table The headers table to modify
+---@param key string The header name
+---@param value string The value to add
+function M.add_header(headers, key, value)
+  local existing = headers[key]
+  if not existing then
+    headers[key] = value
+    return
+  end
+
+  for entry in existing:gmatch("[^,]+") do
+    if vim.trim(entry) == value then
+      return
+    end
+  end
+
+  headers[key] = existing .. "," .. value
+end
+
 ---Replace roles in the messages with the adapter's defined roles
 ---@param roles table The roles mapping, e.g. { user = "human", assistant = "ai" }
 ---@param messages table

tests/adapters/test_adapters.lua

@@ -271,7 +271,7 @@ T["HTTP Adapter"]["can update a model on the adapter"] = function()
     return adapter.resolve(adapter).model
   ]])
 
-  h.eq({ name = "gpt-4-0125-preview" }, result)
+  h.eq({ name = "gpt-4-0125-preview", vendor = "TestAdapter" }, result)
 
   result = child.lua([[
     local adapter = require("codecompanion.adapters").extend("openai", {
@@ -291,11 +291,13 @@ T["HTTP Adapter"]["can update a model on the adapter"] = function()
   ]])
 
   h.eq({
+    formatted_name = "o4 Mini",
     name = "o4-mini-2025-04-16",
     opts = {
       can_reason = true,
       has_vision = true,
     },
+    vendor = "openai",
   }, result)
 end
 
@@ -578,6 +580,40 @@ T["Adapter"]["utils"]["can smartly merge tables together"] = function()
   }, child.lua_get([[utils.merge_messages(messages)]]))
 end
 
+T["Adapter"]["utils"]["add_header sets header when absent"] = function()
+  local result = child.lua([[
+    local headers = {}
+    utils.add_header(headers, "x-custom", "value-a")
+    return headers
+  ]])
+
+  h.eq({ ["x-custom"] = "value-a" }, result)
+end
+
+T["Adapter"]["utils"]["add_header appends without duplicating"] = function()
+  local result = child.lua([[
+    local headers = { ["anthropic-beta"] = "token-efficient-tools-2025-02-19" }
+    utils.add_header(headers, "anthropic-beta", "output-128k-2025-02-19")
+    utils.add_header(headers, "anthropic-beta", "token-efficient-tools-2025-02-19")
+    return headers["anthropic-beta"]
+  ]])
+
+  h.eq("token-efficient-tools-2025-02-19,output-128k-2025-02-19", result)
+end
+
+T["Adapter"]["utils"]["add_header handles multiple values"] = function()
+  local result = child.lua([[
+    local headers = {}
+    utils.add_header(headers, "anthropic-beta", "a")
+    utils.add_header(headers, "anthropic-beta", "b")
+    utils.add_header(headers, "anthropic-beta", "c")
+    utils.add_header(headers, "anthropic-beta", "b")
+    return headers["anthropic-beta"]
+  ]])
+
+  h.eq("a,b,c", result)
+end
+
 T["Adapter"]["utils"]["can consolidate system messages"] = function()
   child.lua([[
     messages = {