diff --git a/internal/skills/registry/registry.go b/internal/skills/registry/registry.go
index 487e12ba3ac..2d2cfbda64e 100644
--- a/internal/skills/registry/registry.go
+++ b/internal/skills/registry/registry.go
@@ -31,7 +31,8 @@ const (
 
 	DefaultAgentID = "github-copilot"
 
-	claudeConfigDirEnv = "CLAUDE_CONFIG_DIR"
+	claudeConfigDirEnv  = "CLAUDE_CONFIG_DIR"
+	piCodingAgentDirEnv = "PI_CODING_AGENT_DIR"
 
 	sharedProjectSkillsDir = ".agents/skills"
 )
@@ -69,7 +70,7 @@ var Agents = []AgentHost{
 		ID:         "codex",
 		Name:       "Codex",
 		ProjectDir: sharedProjectSkillsDir,
-		UserDir:    ".codex/skills",
+		UserDir:    sharedProjectSkillsDir,
 	},
 	{
 		ID:         "gemini-cli",
@@ -415,8 +416,15 @@ func (h *AgentHost) InstallDir(scope Scope, gitRoot, homeDir string) (string, er
 		}
 		return filepath.Join(gitRoot, h.ProjectDir), nil
 	case ScopeUser:
-		if h.ID == "claude-code" {
-			if configDir := os.Getenv(claudeConfigDirEnv); configDir != "" {
+		var configDirEnv string
+		switch h.ID {
+		case "claude-code":
+			configDirEnv = claudeConfigDirEnv
+		case "pi":
+			configDirEnv = piCodingAgentDirEnv
+		}
+		if configDirEnv != "" {
+			if configDir := os.Getenv(configDirEnv); configDir != "" {
 				return filepath.Join(configDir, "skills"), nil
 			}
 		}
diff --git a/internal/skills/registry/registry_test.go b/internal/skills/registry/registry_test.go
index 8472ae3af21..39c6f3bcd88 100644
--- a/internal/skills/registry/registry_test.go
+++ b/internal/skills/registry/registry_test.go
@@ -44,6 +44,7 @@ func TestFindByID(t *testing.T) {
 
 func TestInstallDir(t *testing.T) {
 	t.Setenv(claudeConfigDirEnv, "")
+	t.Setenv(piCodingAgentDirEnv, "")
 
 	tests := []struct {
 		name    string
@@ -90,7 +91,7 @@ func TestInstallDir(t *testing.T) {
 		{
 			name: "claude code user scope, respect env var",
 			setup: func(t *testing.T) {
-				t.Setenv("CLAUDE_CONFIG_DIR", filepath.Join("/home", "monalisa", ".config", "claude"))
+				t.Setenv(claudeConfigDirEnv, filepath.Join("/home", "monalisa", ".config", "claude"))
 			},
 			hostID:  "claude-code",
 			scope:   ScopeUser,
@@ -98,6 +99,25 @@ func TestInstallDir(t *testing.T) {
 			homeDir: "/home/monalisa",
 			wantDir: filepath.Join("/home", "monalisa", ".config", "claude", "skills"),
 		},
+		{
+			name:    "pi user scope",
+			hostID:  "pi",
+			scope:   ScopeUser,
+			gitRoot: "/tmp/monalisa-repo",
+			homeDir: "/home/monalisa",
+			wantDir: filepath.Join("/home/monalisa", ".pi", "agent", "skills"),
+		},
+		{
+			name: "pi user scope, respect env var",
+			setup: func(t *testing.T) {
+				t.Setenv(piCodingAgentDirEnv, filepath.Join("/home", "monalisa", ".config", "pi", "agent"))
+			},
+			hostID:  "pi",
+			scope:   ScopeUser,
+			gitRoot: "/tmp/monalisa-repo",
+			homeDir: "/home/monalisa",
+			wantDir: filepath.Join("/home", "monalisa", ".config", "pi", "agent", "skills"),
+		},
 		{
 			name:    "cursor project scope",
 			hostID:  "cursor",
@@ -114,6 +134,14 @@ func TestInstallDir(t *testing.T) {
 			homeDir: "/home/monalisa",
 			wantDir: filepath.Join("/tmp/monalisa-repo", ".agents", "skills"),
 		},
+		{
+			name:    "codex user scope",
+			hostID:  "codex",
+			scope:   ScopeUser,
+			gitRoot: "/tmp/monalisa-repo",
+			homeDir: "/home/monalisa",
+			wantDir: filepath.Join("/home/monalisa", ".agents", "skills"),
+		},
 		{
 			name:    "gemini project scope",
 			hostID:  "gemini-cli",
diff --git a/pkg/cmd/skills/install/install_test.go b/pkg/cmd/skills/install/install_test.go
index 850f925f832..34f9188a855 100644
--- a/pkg/cmd/skills/install/install_test.go
+++ b/pkg/cmd/skills/install/install_test.go
@@ -1589,6 +1589,37 @@ func TestInstallRun(t *testing.T) {
 			},
 			wantStdout: "Installed git-commit",
 		},
+		{
+			name: "respect pi coding agent dir env var for user scope",
+			setup: func(t *testing.T) {
+				t.Setenv("PI_CODING_AGENT_DIR", t.TempDir())
+			},
+			stubs: func(reg *httpmock.Registry) {
+				stubResolveVersion(reg, "monalisa", "skills-repo", "v1.0.0", "abc123")
+				stubDiscoverTree(reg, "monalisa", "skills-repo", "abc123",
+					singleSkillTreeJSON("git-commit", "treeSHA", "blobSHA"))
+				stubInstallFiles(reg, "monalisa", "skills-repo", "treeSHA", "blobSHA", gitCommitContent)
+			},
+			opts: func(ios *iostreams.IOStreams, reg *httpmock.Registry) *InstallOptions {
+				t.Helper()
+				return &InstallOptions{
+					IO:           ios,
+					HttpClient:   func() (*http.Client, error) { return &http.Client{Transport: reg}, nil },
+					GitClient:    &git.Client{RepoDir: t.TempDir()},
+					SkillSource:  "monalisa/skills-repo",
+					SkillName:    "git-commit",
+					Agent:        "pi",
+					Scope:        "user",
+					ScopeChanged: true,
+					Telemetry:    &telemetry.NoOpService{},
+				}
+			},
+			assert: func(t *testing.T) {
+				assert.FileExists(t, filepath.Join(os.Getenv("PI_CODING_AGENT_DIR"), "skills", "git-commit", "SKILL.md"))
+				assert.NoFileExists(t, filepath.Join(os.Getenv("HOME"), ".pi", "agent", "skills", "git-commit", "SKILL.md"))
+			},
+			wantStdout: "Installed git-commit",
+		},
 	}
 
 	for _, tt := range tests {