bug: copilot requests can take a lot of requests for a single message

[Lutetium-Vanadium]

Describe the bug

Copilot bills usage per request, but when doing something as simple as changing a list to filter out some nodes it bills many requests even though using it with VSCode does not.

To reproduce

No response

Expected behavior

It should take one request for this single user message.

Installation method

Use lazy.nvim:

    {
        "yetone/avante.nvim",
        event = "VeryLazy",
        enabled = function() return not utils.is_git_file() end,
        build = "env -u CARGO_TARGET_DIR make",
        dependencies = {
            "nvim-lua/plenary.nvim",
            "MunifTanjim/nui.nvim",
            {
                "Lutetium-Vanadium/render-markdown.nvim",
                opts = {
                    file_types = { 'markdown', "md", "Avante" },
                    code = {
                        -- Make sure lsp extmarks are higher
                        priority = 100
                    }
                }
            },
            "HakonHarnes/img-clip.nvim",
            "folke/snacks.nvim",
        },
        opts = {
            provider = "copilot",
            mode = "agentic",
            behaviour = {
                auto_apply_diff_after_generation = false,
                support_paste_from_clipboard = true,
                auto_add_current_file = true,
                auto_approve_tool_permissions = {
                    "rag_search", "git_diff", "glob", "search_keyword", "read_file_toplevel_symbols", "read_file",
                    "create_file", "copy_path", "create_dir", "replace_in_file",

                    -- Extracted from http request sent to Copilot
                    "dispatch_agent", "ls", "grep", "delete_tool_use_message", "read_todos", "write_todos",
                    "str_replace", "view", "write_to_file", "insert", "undo_edit", "think", "get_diagnostics",
                    "attempt_completion", "web_search", "fetch", "read_definitions", "add_file_to_context",
                    "remove_file_from_context",
                },
            },
            prompt_logger = {
                enabled = true,
                log_dir = vim.fn.stdpath("cache") .. "/avante_prompts",
                fortune_cookie_on_success = false,
                next_prompt = {
                    normal = "<C-n>",
                    insert = "<C-n>",
                },
                prev_prompt = {
                    normal = "<C-p>",
                    insert = "<C-p>",
                },
            },
            mappings = { <...snipped...> },
            windows = {
                width = 40,
            },
            providers = {
                copilot = {
                    model = "claude-sonnet-4.5"
                },
            }
        }

Environment

NVIM v0.11.5
Build type: Release
LuaJIT 2.1.1763318511
Run "nvim -V1 -v" for more info

Darwin Mac 24.6.0 Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:51 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T8112 arm64 arm Darwin

Repro

vim.env.LAZY_STDPATH = ".repro"
load(vim.fn.system("curl -s https://raw.githubusercontent.com/folke/lazy.nvim/main/bootstrap.lua"))()

require("lazy.minit").repro({
  spec = {
    -- add any other plugins here
  },
})

[WhiteBlackGoose]

Hitting it too. It appears it refeeds the context every time. The LLM starts complaining that it receives the same context file 5-10 times in a row, which of course wastes lots of requests.