diff --git a/flake.lock b/flake.lock
index d885b67..ce70351 100644
--- a/flake.lock
+++ b/flake.lock
@@ -96,6 +96,28 @@
         "type": "github"
       }
     },
+    "herdr": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "lastModified": 1788808373,
+        "narHash": "sha256-SUYF4bbaYwNgoe498VoCUzuLPcjBLQXR0o0DWjjoSnI=",
+        "owner": "herdrdev",
+        "repo": "herdr",
+        "rev": "b99002ac99b09e00b4ca692436cb15a6b0d676f1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "herdrdev",
+        "ref": "v0.9.0",
+        "repo": "herdr",
+        "type": "github"
+      }
+    },
     "ke": {
       "inputs": {
         "nixpkgs": [
@@ -356,6 +378,7 @@
         "arca": "arca",
         "cert": "cert",
         "disko": "disko",
+        "herdr": "herdr",
         "ke": "ke",
         "kte": "kte",
         "lector": "lector",
@@ -371,6 +394,27 @@
         "sgard": "sgard"
       }
     },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "herdr",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1783577481,
+        "narHash": "sha256-EWMxOWrJ031f8f/lrcEmhTRs4npw1/5N3Hcjin846c8=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "4cdea398dc491b082dccdce0fad1ed0b75fa3394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
     "sgard": {
       "inputs": {
         "flake-utils": "flake-utils_2",
diff --git a/flake.nix b/flake.nix
index 8b16e53..793051f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -46,6 +46,9 @@
     mcp.url = "git+https://git@git.wntrmute.dev/mc/mcp";
     mcp.inputs.nixpkgs.follows = "nixpkgs";
 
+    herdr.url = "github:herdrdev/herdr/v0.9.0";
+    herdr.inputs.nixpkgs.follows = "nixpkgs";
+
     # exo.url = "git+https://git.wntrmute.dev/kyle/exo";
     # exo.inputs.nixpkgs.follows = "nixpkgs";
 
diff --git a/hw/straylight/default.nix b/hw/straylight/default.nix
index e2cfef6..d630186 100644
--- a/hw/straylight/default.nix
+++ b/hw/straylight/default.nix
@@ -116,6 +116,12 @@ in
     programs.steam.enable = true;
     programs.steam.protontricks.enable = true;
 
+    # herdr: terminal workspace manager for coding agents (https://herdr.dev).
+    # Pinned to the upstream flake (v0.9.0); nixpkgs-unstable only has 0.7.1.
+    environment.systemPackages = [
+      inputs.herdr.packages.x86_64-linux.default
+    ];
+
     services.open-webui = {
       enable = true;
       host = "0.0.0.0";