{
  den,
  modules,
  inputs,
  ...
}:
{
  modules.pi-coding = {
    homeManager =
      { pkgs, ... }:
      {
        programs.pi-coding-agent = {
          enable = true;
          extraPackages = [
            pkgs.nodejs
            # pkgs.lean-lsp-mcp
          ];
          package = pkgs.pi-coding-agent.overrideAttrs (
            new: old: {
              version = "0.81.1";

              src = pkgs.fetchFromGitHub {
                owner = "earendil-works";
                repo = "pi";
                tag = "v${new.version}";
                hash = "sha256-xo3uoR7HceOCL3wqoMcacOe8WXP1o7ReAXne5t6Hgao=";
              };

              npmDepsHash = "sha256-lzKQZbnITzgV9koucsMno6f61ubBLYUcwQEXtak1r1s=";
              # npmDepsHash = pkgs.lib.fakeHash;

              # npmDepsHash = "sha256-lDoj/94tjJd4ZGU9WgrMOqNSmdpeCljU4c6jGX+TSDY=";

              npmDeps = pkgs.fetchNpmDeps {
                inherit (new) src;
                name = "pi-coding-agent-0.81.1-npm-deps";
                hash = new.npmDepsHash;
              };
              modelData = pkgs.fetchurl {
                url = "https://registry.npmjs.org/@earendil-works/pi-ai/-/pi-ai-${new.version}.tgz";
                hash = "sha256-x53MD5DU370ZdNoz36P+OWZjGVpoM5sfVcEU2/ckDy8=";
                # hash = pkgs.lib.fakeHash;
              };
              preConfigure = ''
                mkdir -p packages/ai/src/providers/data
                tar --extract --gzip --file=${new.modelData} \
                  --directory=packages/ai/src/providers/data \
                  --strip-components=4 \
                  package/dist/providers/data
              '';
              passthru.updateScript = pkgs.nix-update-script {
                extraArgs = [
                  "--custom-dep"
                  "modelData"
                ];
              };
            }
          );
          settings = {
                "litellm" = {
                  "providers" = {
                    "litellm" = {
                      "displayName" = "scuggo";
                      "baseUrl" = "https://9f5db439.fwds.scug.io";
                      "apiKey" = "$SCUG_IO_API_KEY";
                      "compat" = {
                        "sendSessionAffinityHeaders" = true;
                      };
                    };
                  };
                  "skills" = {
                    "enabled" = true;
                  };
                  "compat" = {
                    "sendSessionAffinityHeaders" = true;
                  };
                "mcp" = {
                  "enabled" = true;
                };
                "showCacheMissNotices" = true;
                "qol" = {
                  "permissionGate" = {
                    "enabled" = true;
                    "commands" = "rm -Rf,rm -rf,sudo,chmod,chown,mkfs,dd,shutdown,reboot,poweroff";
                    "previewLines" = 12;
                    "previewChars" = 1200;
                  };
                };
            };
            "mcp" = {
              "enabled" = true;
            };
            packages = [
              # "npm:@odinlayer/pi-provider-litellm"
              # "npm:pi-provider-litellm"
              "npm:@juanibiapina/pi-extension-settings"
              "git:github.com/balcsida/pi-provider-litellm"
              # "npm:pi-web-access"
              # "npm:@gotgenes/pi-permission-system"
              "npm:@vanillagreen/pi-qol"
              "npm:pi-vitals"
              "npm:pi-spark"
              "npm:@zhushanwen/pi-context-engineering"
              "npm:pi-caveman"
              "npm:@tmustier/pi-usage-extension"
              "npm:@heyhuynhgiabuu/pi-pretty"
              "npm:pi-lens"
              # "npm:pi-lean-ctx"
              # "npm:@rohaquinlop/pi-deepseek-cache"
              "npm:pi-cache-optimizer"
            ];
          };
          context = "Heavily prefer to use any appropriate tools instead of raw cmd";
        };

        # pi-vitals config
        home.file.".pi/agent/powerline.json" = {
          text = builtins.toJSON {
            leftSegments = [
              "pi"
              "separator"
              "model"
              "thinking"
              "ext_status"
              "separator"
              "path"
              "git"
              "separator"
              "token_total"
              "token_in"
              "token_out"
              "cache_read"
              "cache_write"
            ];
            rightSegments = [
              "separator"
              "cost"
              "context_pct"
            ];
            icons = {
              pi = "π";
              model = "◈";
              thinking = "🧠";
              folder = "📁";
              repo = "📦";
              git = "⎇";
              tokens = "⊛";
              input = "↑";
              output = "↓";
              cacheRead = "↙";
              cacheWrite = "↗";
              contextPct = "◫";
              cost = "$";
              separator = "│";
            };
            colors = {
              pi = "accent";
              model = "#d787af";
              path = "#00afaf";
              git = "success";
              gitDirty = "warning";
              gitClean = "success";
              thinking = "muted";
              context = "dim";
              contextWarn = "warning";
              contextError = "error";
              cost = "text";
              tokens = "muted";
              separator = "dim";
            };
            segmentOptions = {
              path = {
                mode = "basename";
              };
              git = {
                showBranch = true;
                showStaged = true;
                showUnstaged = true;
                showUntracked = true;
              };
              context_pct = {
                showAutoIcon = false;
              };
            };
          };
        };

        # pi-spark config
        home.file.".pi/agent/spark.json" = {
          text = builtins.toJSON {
            editor = {
              spinner = "tildes";
            };
            footer = false;
            presets = {
              "scuggo" = {
                provider = "litellm";
                model = "meow";
                thinkingLevel = "medium";
              };
              "claude" = {
                provider = "anthropic";
                model = "claude-opus-4-8";
                thinkingLevel = "high";
              };
              "gpt" = {
                provider = "openai-codex";
                model = "gpt-5.5";
                thinkingLevel = "medium";
              };
            };
            recap = {
              idle = "5m";
              provider = "openai-codex";
              model = "gpt-5.4-mini";
              thinkingLevel = "off";
            };
            title = {
              provider = "openai-codex";
              model = "gpt-5.4-mini";
              thinkingLevel = "off";
            };
          };
        };
      };
  };
}