diff --git a/checks/home-manager-module.nix b/checks/home-manager-module.nix
index 789acca..66df1a6 100644
--- a/checks/home-manager-module.nix
+++ b/checks/home-manager-module.nix
@@ -87,15 +87,38 @@ let
     programs.agents.skills = [ skillAlpha ];
   };
 
-  # Claude Code disabled, with a skill still selected.
-  claudeCodeOff = homeFiles {
-    programs.claude-code.enable = false;
+  # Pi enabled and Claude Code disabled.
+  piOnly = homeFiles {
+    programs.pi-coding-agent.enable = true;
     programs.agents.skills = [ skillAlpha ];
   };
 
-  # An empty selection with Claude Code enabled.
+  # Both supported harnesses enabled.
+  bothHarnesses = homeFiles {
+    programs.claude-code.enable = true;
+    programs.pi-coding-agent.enable = true;
+    programs.agents.skills = [ skillAlpha ];
+  };
+
+  # A non-default Pi `configDir`, so the assertions can prove placement follows it
+  # rather than a hardcoded `.pi/agent`.
+  customPiConfigDir = homeFiles {
+    programs.pi-coding-agent.enable = true;
+    programs.pi-coding-agent.configDir = "/home/operator/.config/pi/agent";
+    programs.agents.skills = [ skillAlpha ];
+  };
+
+  # No compatible harness enabled, with a skill still selected.
+  agentsOff = homeFiles {
+    programs.claude-code.enable = false;
+    programs.pi-coding-agent.enable = false;
+    programs.agents.skills = [ skillAlpha ];
+  };
+
+  # An empty selection with both supported harnesses enabled.
   emptySelection = homeFiles {
     programs.claude-code.enable = true;
+    programs.pi-coding-agent.enable = true;
     programs.agents.skills = [ ];
   };
 in
@@ -107,7 +130,10 @@ pkgs.runCommandLocal "skills-home-manager-module-check"
       attrSetSkills
       wholeDirSkills
       customConfigDir
-      claudeCodeOff
+      piOnly
+      bothHarnesses
+      customPiConfigDir
+      agentsOff
       emptySelection
       ;
   }
@@ -142,13 +168,35 @@ pkgs.runCommandLocal "skills-home-manager-module-check"
     test ! -e "$customConfigDir/.claude/skills/sample-alpha" \
       || fail "skill was placed under a hardcoded .claude, ignoring configDir"
 
-    echo "Claude Code disabled: no skill entry is written despite a selection"
-    test ! -e "$claudeCodeOff/.claude/skills/sample-alpha" \
-      || fail "a skill was placed with claude-code disabled"
+    echo "Pi enabled: selected skills land in Pi's global skills directory"
+    test -f "$piOnly/.pi/agent/skills/sample-alpha/SKILL.md" \
+      || fail "selected skill did not land under Pi's configDir"
+    test ! -e "$piOnly/.claude/skills/sample-alpha" \
+      || fail "a skill was placed for Claude Code when only Pi was enabled"
+
+    echo "both harnesses enabled: selected skills land in both global skills directories"
+    test -f "$bothHarnesses/.claude/skills/sample-alpha/SKILL.md" \
+      || fail "selected skill did not land under Claude Code when both harnesses were enabled"
+    test -f "$bothHarnesses/.pi/agent/skills/sample-alpha/SKILL.md" \
+      || fail "selected skill did not land under Pi when both harnesses were enabled"
+
+    echo "custom Pi configDir: placement follows configDir rather than a hardcoded .pi/agent"
+    test -f "$customPiConfigDir/.config/pi/agent/skills/sample-alpha/SKILL.md" \
+      || fail "skill was not placed under Pi's configured configDir"
+    test ! -e "$customPiConfigDir/.pi/agent/skills/sample-alpha" \
+      || fail "skill was placed under a hardcoded .pi/agent, ignoring configDir"
+
+    echo "agents disabled: no skill entry is written despite a selection"
+    test ! -e "$agentsOff/.claude/skills/sample-alpha" \
+      || fail "a skill was placed with Claude Code disabled"
+    test ! -e "$agentsOff/.pi/agent/skills/sample-alpha" \
+      || fail "a skill was placed with Pi disabled"
 
     echo "empty selection: nothing is installed"
     test ! -e "$emptySelection/.claude/skills/sample-alpha" \
-      || fail "an unselected skill was placed"
+      || fail "an unselected skill was placed for Claude Code"
+    test ! -e "$emptySelection/.pi/agent/skills/sample-alpha" \
+      || fail "an unselected skill was placed for Pi"
 
     touch "$out"
   ''
diff --git a/home-manager-module.nix b/home-manager-module.nix
index 816ea3d..1de3e45 100644
--- a/home-manager-module.nix
+++ b/home-manager-module.nix
@@ -1,5 +1,5 @@
-# Places operator-selected skills into Claude Code's skills directory, one per
-# skill, for every project.
+# Places operator-selected skills into each enabled agent's global skills
+# directory, one per skill, for every project.
 {
   config,
   lib,
@@ -8,6 +8,18 @@
 let
   cfg = config.programs.agents;
   claudeCode = config.programs.claude-code;
+  pi = config.programs.pi-coding-agent;
+
+  skillFiles = configDir:
+    lib.listToAttrs (
+      map (skill: {
+        name = "${configDir}/skills/${skill.skillName}";
+        value = {
+          source = skill;
+          recursive = true;
+        };
+      }) cfg.skills
+    );
 in
 {
   options.programs.agents.skills = lib.mkOption {
@@ -15,49 +27,42 @@ in
     default = [ ];
     example = lib.literalExpression "[ inputs.skills.packages.\${system}.some-skill ]";
     description = ''
-      Skills to install globally, into the `skills/` subdirectory of
-      {option}`programs.claude-code.configDir`, so they are active in every
-      project.
+      Skills to install globally into every enabled agent harness that supports
+      Agent Skills.
 
       Selection is by derivation: pass skill derivations from the skills flake's
       `packages.<system>`, each of which carries its placement name as an
       eval-time attribute. An empty list installs nothing.
 
       Every skill is written as its own recursive {option}`home.file`, so this
-      option composes with an operator's own {option}`programs.claude-code.skills`
-      and with other modules placing skills under the same directory rather than
-      claiming the tree. Placement is gated on
-      {option}`programs.claude-code.enable`.
+      option composes with an operator's own harness-specific skills and with
+      other modules placing skills under the same directory rather than claiming
+      the tree. Placement is gated on each harness' enable option.
     '';
   };
 
   # `agents` is an umbrella namespace with no shared enable, so the skills
   # feature self-gates.
-  # An empty list writes nothing, and files land only when Claude Code is
-  # enabled.
-  # Reading each skill's source realises its derivation, so gating on
-  # `claude-code.enable` also keeps that realisation off a host that installs
-  # nothing.
-  config = lib.mkIf claudeCode.enable {
-    # `configDir` comes from the Claude Code module, so skills land beside its
-    # own wherever the operator points it.
-    # Each name is the derivation's eval-time `skillName`, so placement reads no
-    # `$out` and needs no import-from-derivation.
-    # `recursive = true` materialises `skills/<name>/` as a directory of per-file
-    # symlinks, which is what lets this module, the operator's own skills, and
-    # self-placing tool modules share one `skills/` tree.
-    #
-    # This deliberately does not feed the single-valued
-    # `programs.claude-code.skills`, which would collide with an operator already
-    # setting it.
-    home.file = lib.listToAttrs (
-      map (skill: {
-        name = "${claudeCode.configDir}/skills/${skill.skillName}";
-        value = {
-          source = skill;
-          recursive = true;
-        };
-      }) cfg.skills
-    );
-  };
+  # An empty list writes nothing, and files land only when a compatible harness
+  # is enabled.
+  # Reading each skill's source realises its derivation, so gating on harness
+  # enablement also keeps that realisation off a host that installs nothing.
+  config = lib.mkMerge [
+    (lib.mkIf claudeCode.enable {
+      # Each name is the derivation's eval-time `skillName`, so placement reads
+      # no `$out` and needs no import-from-derivation.
+      # `recursive = true` materialises `skills/<name>/` as a directory of
+      # per-file symlinks, which lets this module, the operator's own skills,
+      # and self-placing tool modules share one `skills/` tree.
+      #
+      # This deliberately does not feed the single-valued
+      # `programs.claude-code.skills`, which would collide with an operator
+      # already setting it.
+      home.file = skillFiles claudeCode.configDir;
+    })
+
+    (lib.mkIf pi.enable {
+      home.file = skillFiles pi.configDir;
+    })
+  ];
 }