Codex --plugin-dir prevents stale sibling Spacedock skill providers

* codex: make plugin-dir installs exclusive across channels

* codex-live: credit multi-agent dispatch evidence

---------

Co-authored-by: Spike Test <spike@example.com>

Author: clkao

docs/site/get-started/install.md

@@ -78,10 +78,13 @@ Codex has no such flag on its own CLI, so `spacedock codex --plugin-dir
 local marketplace from the checkout and install it under the binary's own
 channel (`spacedock` stable / `spacedock-edge` edge — matching whatever
 `spacedock codex` would otherwise install), then launch. This IS a persistent
-install, replacing whatever Codex plugin was previously configured, and it is a
+install and Spacedock makes it exclusive across Codex channels: the selected
+channel replaces any existing stable or edge Spacedock Codex plugin so
+`$spacedock:*` skills resolve from the selected install. It is also a
 point-in-time snapshot: editing the checkout afterward has no effect until the
-command is re-run. The command prints an advisory that the reported version
-reflects the checkout's checked-in manifest, not necessarily its current HEAD.
+command is re-run. The command prints an advisory that names the selected channel
+and notes that the reported version reflects the checkout's checked-in manifest,
+not necessarily its current HEAD.
 
 ## Sandboxing
 

internal/cli/channel_selection_test.go

@@ -80,9 +80,10 @@ func TestClaudeChannelInstallArgvSequence(t *testing.T) {
 }
 
 // TestCodexChannelInstallArgvSequence is AC-3's codex half: the codex install argv
-// adds the BARE marketplace-repo source (no `--ref`, since the channel is the
-// marketplace name, not a branch ref) and adds the channel-correct id. The
-// marketplace-remove cleanup targets the channel's marketplace name.
+// removes both Spacedock channel providers before it adds the BARE marketplace-repo
+// source (no `--ref`, since the channel is the marketplace name, not a branch ref)
+// and adds the channel-correct id. Removing both channels keeps Codex's global
+// `spacedock:*` skill namespace authoritative for the selected install.
 func TestCodexChannelInstallArgvSequence(t *testing.T) {
 	cases := []struct {
 		channel         string
@@ -96,8 +97,10 @@ func TestCodexChannelInstallArgvSequence(t *testing.T) {
 	for _, tc := range cases {
 		t.Run(tc.channel, func(t *testing.T) {
 			want := []installStep{
-				{argv: []string{"plugin", "remove", tc.wantID}, tolerateExit: true},
-				{argv: []string{"plugin", "marketplace", "remove", tc.wantMarketplace}, tolerateExit: true},
+				{argv: []string{"plugin", "remove", "spacedock@spacedock"}, tolerateExit: true},
+				{argv: []string{"plugin", "marketplace", "remove", "spacedock"}, tolerateExit: true},
+				{argv: []string{"plugin", "remove", "spacedock@spacedock-edge"}, tolerateExit: true},
+				{argv: []string{"plugin", "marketplace", "remove", "spacedock-edge"}, tolerateExit: true},
 				{argv: []string{"plugin", "marketplace", "add", "spacedock-dev/marketplace"}},
 				{argv: []string{"plugin", "add", tc.wantID}},
 			}

internal/cli/codex_marketplace.go

@@ -135,9 +135,10 @@ func installCodexLocalPluginDir(ops hostOps, checkout string, stderr io.Writer)
 		return fmt.Errorf("install from local marketplace: %w", err)
 	}
 	fmt.Fprintf(stderr,
-		"Installed codex plugin from %s.\n"+
+		"Installed codex plugin from %s as %s.\n"+
+			"Removed other Spacedock Codex channels so $spacedock:* resolves from this install.\n"+
 			"version-masquerade advisory: the reported version reflects the checkout's "+
 			"checked-in .codex-plugin/plugin.json, not necessarily its current HEAD.\n",
-		checkout)
+		checkout, channelPluginID(devBranch))
 	return nil
 }

internal/cli/codex_plugin_dir_test.go

@@ -94,6 +94,12 @@ func TestCodexPluginDirAdvisoryPresenceAndAbsence(t *testing.T) {
 		if !strings.Contains(stderr.String(), advisory) {
 			t.Fatalf("stderr missing the version-masquerade advisory: %q", stderr.String())
 		}
+		if !strings.Contains(stderr.String(), "as "+channelPluginID(devBranch)) {
+			t.Fatalf("advisory must name the selected codex plugin id: %q", stderr.String())
+		}
+		if !strings.Contains(stderr.String(), "Removed other Spacedock Codex channels") {
+			t.Fatalf("advisory must name the sibling-provider cleanup: %q", stderr.String())
+		}
 		if !strings.Contains(stderr.String(), "not necessarily its current HEAD") {
 			t.Fatalf("advisory lost its meaning-bearing clause: %q", stderr.String())
 		}
@@ -139,6 +145,73 @@ func TestInstallCodexPluginDirInstallsViaSharedHelper(t *testing.T) {
 	if !strings.Contains(stderr.String(), "version-masquerade advisory") {
 		t.Fatalf("install --host codex --plugin-dir missing the advisory: %q", stderr.String())
 	}
+	if !strings.Contains(stderr.String(), "as "+channelPluginID(devBranch)) {
+		t.Fatalf("install --host codex --plugin-dir must name the selected plugin id: %q", stderr.String())
+	}
+	if !strings.Contains(stderr.String(), "Removed other Spacedock Codex channels") {
+		t.Fatalf("install --host codex --plugin-dir must name the sibling-provider cleanup: %q", stderr.String())
+	}
+}
+
+// TestInstallCodexLocalPluginDirLeavesOnePromptInputProvider is AC-1's hermetic
+// host smoke. It seeds a fresh CODEX_HOME with BOTH Spacedock channels using raw
+// codex commands, then runs the production --plugin-dir install helper for the
+// selected edge checkout. `codex debug prompt-input` is Codex's own model-visible
+// skill list renderer, so the assertion observes provider resolution without an
+// LLM call: exactly one `spacedock:first-officer` entry remains, and it is the
+// selected checkout's provider.
+func TestInstallCodexLocalPluginDirLeavesOnePromptInputProvider(t *testing.T) {
+	codexBin, err := exec.LookPath("codex")
+	if err != nil {
+		t.Skip("codex not on PATH; prompt-input provider smoke requires the host CLI")
+	}
+	saved := devBranch
+	devBranch = "next"
+	defer func() { devBranch = saved }()
+
+	tmp := t.TempDir()
+	codexHomeDir := filepath.Join(tmp, "codexhome")
+	mustMkdir(t, codexHomeDir)
+	t.Setenv("CODEX_HOME", codexHomeDir)
+
+	stableCheckout := buildCodexFirstOfficerCheckout(t, filepath.Join(tmp, "stable-checkout"), "1.0.0", "STABLE_PROVIDER_SPIKE")
+	oldEdgeCheckout := buildCodexFirstOfficerCheckout(t, filepath.Join(tmp, "old-edge-checkout"), "2.0.0", "OLD_EDGE_PROVIDER_SPIKE")
+	selectedCheckout := buildCodexFirstOfficerCheckout(t, filepath.Join(tmp, "selected-checkout"), "2.0.1", "SELECTED_PROVIDER_SPIKE")
+
+	stableInstall, err := WriteCodexLocalMarketplace(filepath.Join(tmp, "stable-marketplace"), stableCheckout, "spacedock")
+	if err != nil {
+		t.Fatalf("build stable local marketplace: %v", err)
+	}
+	oldEdgeInstall, err := WriteCodexLocalMarketplace(filepath.Join(tmp, "old-edge-marketplace"), oldEdgeCheckout, "spacedock-edge")
+	if err != nil {
+		t.Fatalf("build old edge local marketplace: %v", err)
+	}
+
+	runHost(t, codexBin, os.Environ(), "plugin", "marketplace", "add", stableInstall.MarketplaceRoot)
+	runHost(t, codexBin, os.Environ(), "plugin", "add", "spacedock@spacedock")
+	runHost(t, codexBin, os.Environ(), "plugin", "marketplace", "add", oldEdgeInstall.MarketplaceRoot)
+	runHost(t, codexBin, os.Environ(), "plugin", "add", "spacedock@spacedock-edge")
+
+	if err := installCodexLocalPluginDir(execHost{}, selectedCheckout, io.Discard); err != nil {
+		t.Fatalf("install selected --plugin-dir checkout: %v", err)
+	}
+
+	cmd := exec.Command(codexBin, "debug", "prompt-input", "probe")
+	cmd.Env = os.Environ()
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("codex debug prompt-input failed: %v\n%s", err, out)
+	}
+	rendered := string(out)
+	if got := strings.Count(rendered, "spacedock:first-officer:"); got != 1 {
+		t.Fatalf("prompt input has %d spacedock:first-officer providers, want exactly 1\n%s", got, rendered)
+	}
+	if strings.Contains(rendered, "STABLE_PROVIDER_SPIKE") || strings.Contains(rendered, "OLD_EDGE_PROVIDER_SPIKE") {
+		t.Fatalf("prompt input still exposes stale Spacedock providers:\n%s", rendered)
+	}
+	if !strings.Contains(rendered, "SELECTED_PROVIDER_SPIKE") {
+		t.Fatalf("prompt input missing the selected checkout provider:\n%s", rendered)
+	}
 }
 
 // TestInstallCodexLocalPluginDirResolvesOnEdgeChannel is AC-2: a --plugin-dir codex
@@ -192,3 +265,14 @@ func buildCodexPluginCheckout(t *testing.T, root, version string) string {
 	mustWrite(t, filepath.Join(root, "skills", "demo", "SKILL.md"), "---\nname: demo\ndescription: demo skill\n---\ndemo\n")
 	return root
 }
+
+func buildCodexFirstOfficerCheckout(t *testing.T, root, version, description string) string {
+	t.Helper()
+	mustMkdir(t, filepath.Join(root, ".codex-plugin"))
+	mustMkdir(t, filepath.Join(root, "skills", "first-officer"))
+	mustWrite(t, filepath.Join(root, ".codex-plugin", "plugin.json"),
+		`{ "name": "spacedock", "version": "`+version+`", "requires-contract": ">=3,<4", "skills": "./skills/" }
+`)
+	mustWrite(t, filepath.Join(root, "skills", "first-officer", "SKILL.md"), "---\nname: first-officer\ndescription: "+description+"\n---\n"+description+"\n")
+	return root
+}

internal/cli/host_exec.go

@@ -347,26 +347,26 @@ func installArgvSequence(source, devBranch string) []installStep {
 	}
 }
 
-// codexInstallArgvSequence is the codex analog of installArgvSequence: the same
-// 4-command cleanup-then-pin shape, but in codex's verb vocabulary (`plugin
-// remove` / `plugin add`, not claude's `uninstall` / `install`). The marketplace
-// add carries the source channelMarketplaceSource resolved (no `--ref` flag — any
-// channel ref is part of the source string): the bare repo for stable (root
-// marketplace.json named `spacedock`), `<repo>@edge` for edge (the `edge` branch
-// whose root marketplace.json is named `spacedock-edge`, so the add registers
-// `spacedock-edge` and the channel id `spacedock@spacedock-edge` resolves). The
-// entry is always `spacedock`, and the version pin lives in the marketplace
-// manifest. The tolerance asymmetry matches claude:
-// BOTH cleanup steps (plugin remove + marketplace remove) are tolerated — on a
-// fresh box `plugin remove` exits 0 (idempotent) but `marketplace remove` exits 1
-// ("marketplace is not configured or installed"), and neither is a real failure.
-// BOTH pinning steps (marketplace add + plugin add) stay fail-fast — they are the
-// real-failure backstops.
+// codexInstallArgvSequence is the codex analog of installArgvSequence, but Codex's
+// global skill namespace means Spacedock channels must be exclusive: remove BOTH
+// stable and edge before adding the selected channel. The marketplace add carries
+// the source channelMarketplaceSource resolved (no `--ref` flag — any channel ref
+// is part of the source string): the bare repo for stable (root marketplace.json
+// named `spacedock`), `<repo>@edge` for edge (the `edge` branch whose root
+// marketplace.json is named `spacedock-edge`, so the add registers `spacedock-edge`
+// and the channel id `spacedock@spacedock-edge` resolves). The entry is always
+// `spacedock`, and the version pin lives in the marketplace manifest. Cleanup
+// steps are tolerated — on a fresh box `plugin remove` exits 0 (idempotent) but
+// `marketplace remove` exits 1 ("marketplace is not configured or installed"), and
+// neither is a real failure. The pinning steps (marketplace add + plugin add) stay
+// fail-fast as real-failure backstops.
 func codexInstallArgvSequence(source, devBranch string) []installStep {
 	id := channelPluginID(devBranch)
 	return []installStep{
-		{argv: []string{"plugin", "remove", id}, tolerateExit: true},
-		{argv: []string{"plugin", "marketplace", "remove", channelMarketplace(devBranch)}, tolerateExit: true},
+		{argv: []string{"plugin", "remove", "spacedock@spacedock"}, tolerateExit: true},
+		{argv: []string{"plugin", "marketplace", "remove", "spacedock"}, tolerateExit: true},
+		{argv: []string{"plugin", "remove", "spacedock@spacedock-edge"}, tolerateExit: true},
+		{argv: []string{"plugin", "marketplace", "remove", "spacedock-edge"}, tolerateExit: true},
 		{argv: []string{"plugin", "marketplace", "add", source}},
 		{argv: []string{"plugin", "add", id}},
 	}
@@ -378,8 +378,10 @@ func codexInstallArgvSequence(source, devBranch string) []installStep {
 // installArgvSequence / codexInstallArgvSequence; devBranch selects the channel
 // entry both install. The two cleanup steps are tolerated — their non-zero exits
 // on a fresh-box ("not installed" / "not found") are appended to combined output
-// and the loop continues. The two pinning steps (marketplace add, plugin
-// install/add) are fail-fast and surface real install failures.
+// and the loop continues. Codex has four cleanup steps because it removes both
+// Spacedock channels before pinning the selected one. The pinning steps
+// (marketplace add, plugin install/add) are fail-fast and surface real install
+// failures.
 func (execHost) Install(host, source, devBranch string) (string, error) {
 	var steps []installStep
 	switch host {

internal/cli/install_tolerance_codex_test.go

@@ -10,11 +10,11 @@ import (
 )
 
 // TestCodexInstallIssuesSequenceInOrder locks AC-1a: a stub codex that exits 0 on
-// every step → Install("codex", "spacedock-dev/marketplace", "next") returns nil
-// and the combined output carries all four step markers, including the bare
-// marketplace-repo `plugin marketplace add spacedock-dev/marketplace` (no --ref)
-// and the edge channel's `plugin add spacedock@spacedock-edge`. The stub's echoed
-// argv is the independent source of truth.
+// every step -> Install("codex", "spacedock-dev/marketplace", "next") returns nil
+// and the combined output carries all six step markers. Both Spacedock channels
+// are removed before the selected marketplace source is re-added, so Codex cannot
+// keep a stale sibling `spacedock:*` provider enabled beside the selected install.
+// The stub's echoed argv is the independent source of truth.
 func TestCodexInstallIssuesSequenceInOrder(t *testing.T) {
 	if runtime.GOOS == "windows" {
 		t.Skip("stub script uses /bin/sh; not portable to Windows")
@@ -27,6 +27,8 @@ func TestCodexInstallIssuesSequenceInOrder(t *testing.T) {
 		t.Fatalf("Install returned error on all-zero codex stub: %v\nout=%q", err, out)
 	}
 	wantOrder := []string{
+		"stub:plugin remove spacedock@spacedock:exit=0",
+		"stub:plugin marketplace remove spacedock:exit=0",
 		"stub:plugin remove spacedock@spacedock-edge:exit=0",
 		"stub:plugin marketplace remove spacedock-edge:exit=0",
 		"stub:plugin marketplace add spacedock-dev/marketplace:exit=0",
@@ -49,8 +51,8 @@ func TestCodexInstallIssuesSequenceInOrder(t *testing.T) {
 // TestCodexInstallToleratesMarketplaceRemoveFailure locks AC-1b: the fresh-box
 // path where `codex plugin marketplace remove <marketplace>` exits 1 ("is not
 // configured or installed") and every other step exits 0. Install MUST return a
-// nil error and the combined output MUST carry all four step markers — the
-// marketplace remove is a tolerated cleanup step.
+// nil error and the combined output MUST carry both channel cleanup markers before
+// the add markers — marketplace remove is a tolerated cleanup step.
 func TestCodexInstallToleratesMarketplaceRemoveFailure(t *testing.T) {
 	if runtime.GOOS == "windows" {
 		t.Skip("stub script uses /bin/sh; not portable to Windows")
@@ -63,6 +65,8 @@ func TestCodexInstallToleratesMarketplaceRemoveFailure(t *testing.T) {
 		t.Fatalf("Install returned error on tolerated marketplace-remove failure: %v\nout=%q", err, out)
 	}
 	for _, want := range []string{
+		"stub:plugin remove spacedock@spacedock:exit=0",
+		"stub:plugin marketplace remove spacedock:exit=1",
 		"stub:plugin remove spacedock@spacedock-edge:exit=0",
 		"stub:plugin marketplace remove spacedock-edge:exit=1",
 		"stub:plugin marketplace add spacedock-dev/marketplace:exit=0",
@@ -75,10 +79,10 @@ func TestCodexInstallToleratesMarketplaceRemoveFailure(t *testing.T) {
 }
 
 // TestCodexInstallToleratesPluginRemoveFailure locks the cleanup half of AC-1b:
-// when `codex plugin remove spacedock@spacedock` exits 1 and every other step
-// exits 0, Install MUST still return nil — the plugin remove is a tolerated
-// cleanup step (idempotent on a fresh box per the spike, exit 0; tolerated here
-// so a future codex that exits 1 on a fresh box does not break the install).
+// when `codex plugin remove <spacedock channel id>` exits 1 and every other step
+// exits 0, Install MUST still return nil — plugin remove is a tolerated cleanup
+// step (idempotent on a fresh box per the spike, exit 0; tolerated here so a
+// future codex that exits 1 on a fresh box does not break the install).
 func TestCodexInstallToleratesPluginRemoveFailure(t *testing.T) {
 	if runtime.GOOS == "windows" {
 		t.Skip("stub script uses /bin/sh; not portable to Windows")
@@ -91,6 +95,7 @@ func TestCodexInstallToleratesPluginRemoveFailure(t *testing.T) {
 		t.Fatalf("Install returned error on tolerated plugin-remove failure: %v\nout=%q", err, out)
 	}
 	for _, want := range []string{
+		"stub:plugin remove spacedock@spacedock:exit=1",
 		"stub:plugin remove spacedock@spacedock-edge:exit=1",
 		"stub:plugin marketplace add spacedock-dev/marketplace:exit=0",
 		"stub:plugin add spacedock@spacedock-edge:exit=0",
@@ -165,6 +170,9 @@ func TestCodexInstallStableEntryOmitsRef(t *testing.T) {
 	if !strings.Contains(out, "stub:plugin marketplace add spacedock-dev/marketplace:exit=0") {
 		t.Errorf("combined output missing bare-source add marker; out=%q", out)
 	}
+	if !strings.Contains(out, "stub:plugin remove spacedock@spacedock-edge:exit=0") {
+		t.Errorf("stable install must still remove the edge sibling; out=%q", out)
+	}
 	if !strings.Contains(out, "stub:plugin add spacedock@spacedock:exit=0") {
 		t.Errorf("combined output missing stable-channel plugin add marker; out=%q", out)
 	}