diff --git a/scripts/gen-skill-docs.ts b/scripts/gen-skill-docs.ts
index ec4951890..fa9a75306 100644
--- a/scripts/gen-skill-docs.ts
+++ b/scripts/gen-skill-docs.ts
@@ -33,8 +33,9 @@ const HOST_ARG_VAL: HostArg = (() => {
   if (val === 'codex' || val === 'agents') return 'codex';
   if (val === 'factory' || val === 'droid') return 'factory';
   if (val === 'claude') return 'claude';
+  if (val === 'opencode') return 'opencode';
   if (val === 'all') return 'all';
-  throw new Error(`Unknown host: ${val}. Use claude, codex, factory, droid, agents, or all.`);
+  throw new Error(`Unknown host: ${val}. Use claude, codex, factory, droid, opencode, agents, or all.`);
 })();
 
 // For single-host mode, HOST is the host. For --host all, it's set per iteration below.
@@ -242,6 +243,7 @@ interface ExternalHostConfig {
 const EXTERNAL_HOST_CONFIG: Record<string, ExternalHostConfig> = {
   codex:   { hostSubdir: '.agents',  generateMetadata: true,  descriptionLimit: 1024 },
   factory: { hostSubdir: '.factory', generateMetadata: false },
+  opencode: { hostSubdir: '.opencode', generateMetadata: false },
 };
 
 // ─── Template Processing ────────────────────────────────────
@@ -300,8 +302,8 @@ function processExternalHost(
   result = result.replace(/\.claude\/skills\/review/g, `${config.hostSubdir}/skills/gstack/review`);
   result = result.replace(/\.claude\/skills/g, `${config.hostSubdir}/skills`);
 
-  // Factory-only: translate Claude Code tool names to generic phrasing
-  if (host === 'factory') {
+  // Factory/Opencode: translate Claude Code tool names to generic phrasing
+  if (host === 'factory' || host === 'opencode') {
     result = result.replace(/use the Bash tool/g, 'run this command');
     result = result.replace(/use the Write tool/g, 'create this file');
     result = result.replace(/use the Read tool/g, 'read the file');
@@ -395,7 +397,7 @@ function findTemplates(): string[] {
   return discoverTemplates(ROOT).map(t => path.join(ROOT, t.tmpl));
 }
 
-const ALL_HOSTS: Host[] = ['claude', 'codex', 'factory'];
+const ALL_HOSTS: Host[] = ['claude', 'codex', 'factory', 'opencode'];
 const hostsToRun: Host[] = HOST_ARG_VAL === 'all' ? ALL_HOSTS : [HOST];
 const failures: { host: string; error: Error }[] = [];
 
diff --git a/scripts/resolvers/types.ts b/scripts/resolvers/types.ts
index 785f5a3a8..018a279de 100644
--- a/scripts/resolvers/types.ts
+++ b/scripts/resolvers/types.ts
@@ -1,4 +1,4 @@
-export type Host = 'claude' | 'codex' | 'factory';
+export type Host = 'claude' | 'codex' | 'factory' | 'opencode';
 
 export interface HostPaths {
   skillRoot: string;
@@ -30,6 +30,13 @@ export const HOST_PATHS: Record<Host, HostPaths> = {
     browseDir: '$GSTACK_BROWSE',
     designDir: '$GSTACK_DESIGN',
   },
+  opencode: {
+    skillRoot: '~/.config/opencode/skills/gstack',
+    localSkillRoot: '.config/opencode/skills/gstack',
+    binDir: '~/.config/opencode/skills/gstack/bin',
+    browseDir: '~/.config/opencode/skills/gstack/browse/dist',
+    designDir: '~/.config/opencode/skills/gstack/design/dist',
+  },
 };
 
 export interface TemplateContext {
diff --git a/setup b/setup
index 91f0c9e73..a4fdc22f2 100755
--- a/setup
+++ b/setup
@@ -21,6 +21,8 @@ CODEX_SKILLS="$HOME/.codex/skills"
 CODEX_GSTACK="$CODEX_SKILLS/gstack"
 FACTORY_SKILLS="$HOME/.factory/skills"
 FACTORY_GSTACK="$FACTORY_SKILLS/gstack"
+OPENCODE_SKILLS="$HOME/.config/opencode/skills"
+OPENCODE_GSTACK="$OPENCODE_SKILLS/gstack"
 
 IS_WINDOWS=0
 case "$(uname -s)" in
@@ -34,7 +36,7 @@ SKILL_PREFIX=1
 SKILL_PREFIX_FLAG=0
 while [ $# -gt 0 ]; do
   case "$1" in
-    --host) [ -z "$2" ] && echo "Missing value for --host (expected claude, codex, kiro, or auto)" >&2 && exit 1; HOST="$2"; shift 2 ;;
+    --host) [ -z "$2" ] && echo "Missing value for --host (expected claude, codex, kiro, factory, opencode, or auto)" >&2 && exit 1; HOST="$2"; shift 2 ;;
     --host=*) HOST="${1#--host=}"; shift ;;
     --local) LOCAL_INSTALL=1; shift ;;
     --prefix)    SKILL_PREFIX=1; SKILL_PREFIX_FLAG=1; shift ;;
@@ -44,8 +46,8 @@ while [ $# -gt 0 ]; do
 done
 
 case "$HOST" in
-  claude|codex|kiro|factory|auto) ;;
-  *) echo "Unknown --host value: $HOST (expected claude, codex, kiro, factory, or auto)" >&2; exit 1 ;;
+  claude|codex|kiro|factory|opencode|auto) ;;
+  *) echo "Unknown --host value: $HOST (expected claude, codex, kiro, factory, opencode, or auto)" >&2; exit 1 ;;
 esac
 
 # ─── Resolve skill prefix preference ─────────────────────────
@@ -104,13 +106,15 @@ INSTALL_CLAUDE=0
 INSTALL_CODEX=0
 INSTALL_KIRO=0
 INSTALL_FACTORY=0
+INSTALL_OPENCODE=0
 if [ "$HOST" = "auto" ]; then
   command -v claude >/dev/null 2>&1 && INSTALL_CLAUDE=1
   command -v codex >/dev/null 2>&1 && INSTALL_CODEX=1
   command -v kiro-cli >/dev/null 2>&1 && INSTALL_KIRO=1
   command -v droid >/dev/null 2>&1 && INSTALL_FACTORY=1
+  command -v opencode >/dev/null 2>&1 && INSTALL_OPENCODE=1
   # If none found, default to claude
-  if [ "$INSTALL_CLAUDE" -eq 0 ] && [ "$INSTALL_CODEX" -eq 0 ] && [ "$INSTALL_KIRO" -eq 0 ] && [ "$INSTALL_FACTORY" -eq 0 ]; then
+  if [ "$INSTALL_CLAUDE" -eq 0 ] && [ "$INSTALL_CODEX" -eq 0 ] && [ "$INSTALL_KIRO" -eq 0 ] && [ "$INSTALL_FACTORY" -eq 0 ] && [ "$INSTALL_OPENCODE" -eq 0 ]; then
     INSTALL_CLAUDE=1
   fi
 elif [ "$HOST" = "claude" ]; then
@@ -121,6 +125,8 @@ elif [ "$HOST" = "kiro" ]; then
   INSTALL_KIRO=1
 elif [ "$HOST" = "factory" ]; then
   INSTALL_FACTORY=1
+elif [ "$HOST" = "opencode" ]; then
+  INSTALL_OPENCODE=1
 fi
 
 migrate_direct_codex_install() {
@@ -671,6 +677,58 @@ if [ "$INSTALL_FACTORY" -eq 1 ]; then
   echo "  factory skills: $FACTORY_SKILLS"
 fi
 
+# 6c. Install for Opencode (copy from .opencode/skills, rewrite paths)
+if [ "$INSTALL_OPENCODE" -eq 1 ]; then
+  mkdir -p "$OPENCODE_SKILLS"
+
+  # Generate .opencode/ Opencode skill docs
+  OPENCODE_DIR="$SOURCE_GSTACK_DIR/.opencode/skills"
+  if [ ! -d "$OPENCODE_DIR" ]; then
+    echo "Generating .opencode/ skill docs..."
+    (
+      cd "$SOURCE_GSTACK_DIR"
+      bun install --frozen-lockfile 2>/dev/null || bun install
+      bun run gen:skill-docs --host opencode
+    )
+  fi
+
+  # Create gstack dir with symlinks for runtime assets
+  [ -L "$OPENCODE_GSTACK" ] && rm -f "$OPENCODE_GSTACK"
+  mkdir -p "$OPENCODE_GSTACK" "$OPENCODE_GSTACK/browse" "$OPENCODE_GSTACK/gstack-upgrade" "$OPENCODE_GSTACK/review"
+  ln -snf "$SOURCE_GSTACK_DIR/bin" "$OPENCODE_GSTACK/bin"
+  ln -snf "$SOURCE_GSTACK_DIR/browse/dist" "$OPENCODE_GSTACK/browse/dist"
+  ln -snf "$SOURCE_GSTACK_DIR/browse/bin" "$OPENCODE_GSTACK/browse/bin"
+  if [ -f "$SOURCE_GSTACK_DIR/ETHOS.md" ]; then
+    ln -snf "$SOURCE_GSTACK_DIR/ETHOS.md" "$OPENCODE_GSTACK/ETHOS.md"
+  fi
+
+  # Rewrite root SKILL.md paths for Opencode
+  sed -e "s|~/.claude/skills/gstack|~/.config/opencode/skills/gstack|g" \
+      -e "s|\.claude/skills/gstack|.config/opencode/skills/gstack|g" \
+      -e "s|\.claude/skills|.config/opencode/skills|g" \
+      "$SOURCE_GSTACK_DIR/SKILL.md" > "$OPENCODE_GSTACK/SKILL.md"
+
+  if [ ! -d "$OPENCODE_DIR" ]; then
+    echo "  warning: no .opencode/skills/ directory found — run 'bun run gen:skill-docs --host opencode' first" >&2
+  else
+    for skill_dir in "$OPENCODE_DIR"/gstack*/; do
+      [ -f "$skill_dir/SKILL.md" ] || continue
+      skill_name="$(basename "$skill_dir")"
+      target_dir="$OPENCODE_SKILLS/$skill_name"
+      mkdir -p "$target_dir"
+      # Rewrite any remaining literal paths
+      sed -e 's|\$HOME/.codex/skills/gstack|$HOME/.config/opencode/skills/gstack|g' \
+          -e "s|~/.codex/skills/gstack|~/.config/opencode/skills/gstack|g" \
+          -e "s|~/.factory/skills/gstack|~/.config/opencode/skills/gstack|g" \
+          -e "s|\$GSTACK_ROOT|~/.config/opencode/skills/gstack|g" \
+          "$skill_dir/SKILL.md" > "$target_dir/SKILL.md"
+    done
+    echo "gstack ready (opencode)."
+    echo "  browse: $BROWSE_BIN"
+    echo "  opencode skills: $OPENCODE_SKILLS"
+  fi
+fi
+
 # 7. Create .agents/ sidecar symlinks for the real Codex skill target.
 # The root Codex skill ends up pointing at $SOURCE_GSTACK_DIR/.agents/skills/gstack,
 # so the runtime assets must live there for both global and repo-local installs.
diff --git a/test/gen-skill-docs.test.ts b/test/gen-skill-docs.test.ts
index fff58a5e7..d2e4b03ca 100644
--- a/test/gen-skill-docs.test.ts
+++ b/test/gen-skill-docs.test.ts
@@ -1969,15 +1969,17 @@ describe('setup script validation', () => {
     expect(fnBody).toContain('ln -snf "gstack/$dir_name"');
   });
 
-  test('setup supports --host auto|claude|codex|kiro', () => {
+  test('setup supports --host auto|claude|codex|kiro|factory|opencode', () => {
     expect(setupContent).toContain('--host');
-    expect(setupContent).toContain('claude|codex|kiro|factory|auto');
+    expect(setupContent).toContain('claude|codex|kiro|factory|opencode|auto');
   });
 
-  test('auto mode detects claude, codex, and kiro binaries', () => {
+  test('auto mode detects claude, codex, kiro, factory, and opencode binaries', () => {
     expect(setupContent).toContain('command -v claude');
     expect(setupContent).toContain('command -v codex');
     expect(setupContent).toContain('command -v kiro-cli');
+    expect(setupContent).toContain('command -v droid');
+    expect(setupContent).toContain('command -v opencode');
   });
 
   // T1: Sidecar skip guard — prevents .agents/skills/gstack from being linked as a skill