{
  config,
  lib,
  pkgs,
  ...
}:
{
  programs.opencode = {
    enable = true;
    rules = ''
      You are an intelligent and observant agent.
      If instructed to commit, disable gpg signing.
      You are on nixOS, if you don't have access to a tool, you can access it via the `nix-shell` command.

      ## Think deeply about everything.
      When given a problem, break it down, abstract it out, understand the fundamentals, then solve it in the real world.

      ## Misc
      For long-running commands, make sure you set the timeout of the Bash tool provided to a larger value.
      Do NOT read secret files. Do not directly read files that are api keys or are contextually sensitive.

      ## Behavior
      Do not be sycophantic in your responses.
      Do not use emojis unless explicitly asked.

      ## Nix
      For using `nix build` for any test, always append `-L --rebuild`. Build results are cached and may not behave as expected.
    '';
    settings = {
      theme = "opencode";

      model = "openrouter/z-ai/glm-4.6";
      # small model used for titles
      small_model = "openrouter/openai/gpt-oss-20b";

      autoshare = false;
      autoupdate = true;
      agent = {
      };
      provider = {
        openrouter = {
          models = {
            "z-ai/glm-4.6" = { };
            "minimax/minimax-m2" = { };
            "google/gemini-3-pro-preview" = { };
            "anthropic/claude-sonnet-4.5" = { };
            "qwen/qwen3-coder-30b-a3b-instruct" = { };
            "openrouter/openai/gpt-oss-20b" = { };
          };
          options = {
            # TODO! use agenix here instead
            apiKey = "{file:${../secrets/openrouter_api_key}}";
          };
        };
      };
    };
  };
}