diff --git a/.changeset/eager-yaks-roam.md b/.changeset/eager-yaks-roam.md
new file mode 100644
index 000000000..fca673f17
--- /dev/null
+++ b/.changeset/eager-yaks-roam.md
@@ -0,0 +1,5 @@
+---
+type: Fixed
+pr: 3112
+---
+**Installer `--help` now documents every supported runtime** — `--pi` and `--gemini` were accepted but omitted from the help output, making them invisible to users discovering runtime support via `--help`. A parity test now guards against future drift. (#3026)
diff --git a/bin/install.js b/bin/install.js
index fc94320c8..6e6bfc685 100755
--- a/bin/install.js
+++ b/bin/install.js
@@ -913,7 +913,7 @@ if (hasUninstall) {
 
 // Show help if requested
 if (hasHelp) {
-  console.log(`  ${yellow}Usage:${reset} npx ${pkg.name} [options]\n\n  ${yellow}Options:${reset}\n    ${cyan}-g, --global${reset}              Install globally (to config directory)\n    ${cyan}-l, --local${reset}               Install locally (to current directory)\n    ${cyan}--claude${reset}                  Install for Claude Code only\n    ${cyan}--opencode${reset}                Install for OpenCode only\n    ${cyan}--kilo${reset}                    Install for Kilo only\n    ${cyan}--codex${reset}                   Install for Codex only\n    ${cyan}--kimi${reset}                    Install for Kimi CLI only\n    ${cyan}--copilot${reset}                 Install for Copilot only\n    ${cyan}--antigravity${reset}             Install for Antigravity only\n    ${cyan}--cursor${reset}                  Install for Cursor only\n    ${cyan}--windsurf${reset}                Install for Windsurf only\n    ${cyan}--augment${reset}                 Install for Augment only\n    ${cyan}--trae${reset}                    Install for Trae only\n    ${cyan}--qwen${reset}                    Install for Qwen Code only\n    ${cyan}--hermes${reset}                  Install for Hermes Agent only\n    ${cyan}--cline${reset}                   Install for Cline only\n    ${cyan}--codebuddy${reset}              Install for CodeBuddy only\n    ${cyan}--zcode${reset}                  Install for ZCode only\n    ${cyan}--all${reset}                     Install for all runtimes\n    ${cyan}-u, --uninstall${reset}           Uninstall GSD (remove all GSD files)\n    ${cyan}-c, --config-dir <path>${reset}   Specify custom config directory\n    ${cyan}-h, --help${reset}                Show this help message\n    ${cyan}--force-statusline${reset}        Replace existing statusline config\n    ${cyan}--portable-hooks${reset}          Emit \$HOME-relative hook paths in settings.json\n                              (for WSL/Docker bind-mount setups; also GSD_PORTABLE_HOOKS=1)\n    ${cyan}--profile=<name>${reset}         Install a named skill profile. Profiles:\n                              core     — ${PROFILES.core.length} main-loop skills incl. phase (~130 desc tokens)\n                              standard — ${PROFILES.standard.length} skills incl. phase, review, config (~700)\n                              full     — all skills (default)\n                              Composable: --profile=core,audit installs union of closures.\n                              Profile is persisted and respected by \`gsd update\`.\n    ${cyan}--minimal${reset}                 Alias for --profile=core (back-compat).\n                              Cuts cold-start overhead from ~12k tokens to ~700.\n                              Alias: --core-only.\n\n  ${yellow}Examples:${reset}\n    ${dim}# Interactive install (prompts for runtime and location)${reset}\n    npx ${pkg.name}\n\n    ${dim}# Install for Claude Code globally${reset}\n    npx ${pkg.name} --claude --global\n\n    ${dim}# Install for Kilo globally${reset}\n    npx ${pkg.name} --kilo --global\n\n    ${dim}# Install for Codex globally${reset}\n    npx ${pkg.name} --codex --global\n\n    ${dim}# Install for Kimi CLI globally${reset}\n    npx ${pkg.name} --kimi --global\n\n    ${dim}# Install for Kimi CLI under ~/.kimi-code${reset}\n    npx ${pkg.name} --kimi --global --config-dir ~/.kimi-code\n\n    ${dim}# Install for Copilot globally${reset}\n    npx ${pkg.name} --copilot --global\n\n    ${dim}# Install for Copilot locally${reset}\n    npx ${pkg.name} --copilot --local\n\n    ${dim}# Install for Antigravity globally${reset}\n    npx ${pkg.name} --antigravity --global\n\n    ${dim}# Install for Antigravity locally${reset}\n    npx ${pkg.name} --antigravity --local\n\n    ${dim}# Install for Cursor globally${reset}\n    npx ${pkg.name} --cursor --global\n\n    ${dim}# Install for Cursor locally${reset}\n    npx ${pkg.name} --cursor --local\n\n    ${dim}# Install for Windsurf globally${reset}\n    npx ${pkg.name} --windsurf --global\n\n    ${dim}# Install for Windsurf locally${reset}\n    npx ${pkg.name} --windsurf --local\n\n    ${dim}# Install for Augment globally${reset}\n    npx ${pkg.name} --augment --global\n\n    ${dim}# Install for Augment locally${reset}\n    npx ${pkg.name} --augment --local\n\n    ${dim}# Install for Trae globally${reset}\n    npx ${pkg.name} --trae --global\n\n    ${dim}# Install for Trae locally${reset}\n    npx ${pkg.name} --trae --local\n\n    ${dim}# Install for Hermes Agent globally${reset}\n    npx ${pkg.name} --hermes --global\n\n    ${dim}# Install for Hermes Agent locally${reset}\n    npx ${pkg.name} --hermes --local\n\n    ${dim}# Install for Cline globally${reset}\n    npx ${pkg.name} --cline --global\n\n    ${dim}# Install for Cline locally${reset}\n    npx ${pkg.name} --cline --local\n\n    ${dim}# Install for CodeBuddy globally${reset}\n    npx ${pkg.name} --codebuddy --global\n\n    ${dim}# Install for CodeBuddy locally${reset}\n    npx ${pkg.name} --codebuddy --local\n\n    ${dim}# Install for all runtimes globally${reset}\n    npx ${pkg.name} --all --global\n\n    ${dim}# Install to custom config directory${reset}\n    npx ${pkg.name} --kilo --global --config-dir ~/.kilo-work\n\n    ${dim}# Install to current project only${reset}\n    npx ${pkg.name} --claude --local\n\n    ${dim}# Uninstall GSD from Cursor globally${reset}\n    npx ${pkg.name} --cursor --global --uninstall\n\n  ${yellow}Notes:${reset}\n    The --config-dir option is useful when you have multiple configurations.\n    It takes priority over CLAUDE_CONFIG_DIR / OPENCODE_CONFIG_DIR / KILO_CONFIG_DIR / CODEX_HOME / KIMI_CONFIG_DIR / COPILOT_CONFIG_DIR / COPILOT_HOME / ANTIGRAVITY_CONFIG_DIR / CURSOR_CONFIG_DIR / WINDSURF_CONFIG_DIR / AUGMENT_CONFIG_DIR / TRAE_CONFIG_DIR / QWEN_CONFIG_DIR / HERMES_HOME / CLINE_CONFIG_DIR / CODEBUDDY_CONFIG_DIR environment variables.\n    Kimi CLI defaults to the first existing generic skills root: ${cyan}~/.config/agents/skills${reset}, then ${cyan}~/.agents/skills${reset}; if neither exists, GSD creates ${cyan}~/.config/agents${reset}.\n    Use ${cyan}--config-dir ~/.kimi-code${reset} or ${cyan}KIMI_CONFIG_DIR=~/.kimi-code${reset} for brand-specific Kimi installs.\n`);
+  console.log(`  ${yellow}Usage:${reset} npx ${pkg.name} [options]\n\n  ${yellow}Options:${reset}\n    ${cyan}-g, --global${reset}              Install globally (to config directory)\n    ${cyan}-l, --local${reset}               Install locally (to current directory)\n    ${cyan}--claude${reset}                  Install for Claude Code only\n    ${cyan}--opencode${reset}                Install for OpenCode only\n    ${cyan}--kilo${reset}                    Install for Kilo only\n    ${cyan}--codex${reset}                   Install for Codex only\n    ${cyan}--kimi${reset}                    Install for Kimi CLI only\n    ${cyan}--copilot${reset}                 Install for Copilot only\n    ${cyan}--antigravity${reset}             Install for Antigravity only\n    ${cyan}--cursor${reset}                  Install for Cursor only\n    ${cyan}--windsurf${reset}                Install for Windsurf only\n    ${cyan}--augment${reset}                 Install for Augment only\n    ${cyan}--trae${reset}                    Install for Trae only\n    ${cyan}--qwen${reset}                    Install for Qwen Code only\n    ${cyan}--hermes${reset}                  Install for Hermes Agent only\n    ${cyan}--cline${reset}                   Install for Cline only\n    ${cyan}--codebuddy${reset}              Install for CodeBuddy only\n    ${cyan}--zcode${reset}                  Install for ZCode only\n    ${cyan}--pi${reset}                      Install for Pi only\n    ${cyan}--gemini${reset}                  Install for Gemini CLI only\n    ${cyan}--all${reset}                     Install for all runtimes\n    ${cyan}-u, --uninstall${reset}           Uninstall GSD (remove all GSD files)\n    ${cyan}-c, --config-dir <path>${reset}   Specify custom config directory\n    ${cyan}-h, --help${reset}                Show this help message\n    ${cyan}--force-statusline${reset}        Replace existing statusline config\n    ${cyan}--portable-hooks${reset}          Emit \$HOME-relative hook paths in settings.json\n                              (for WSL/Docker bind-mount setups; also GSD_PORTABLE_HOOKS=1)\n    ${cyan}--profile=<name>${reset}         Install a named skill profile. Profiles:\n                              core     — ${PROFILES.core.length} main-loop skills incl. phase (~130 desc tokens)\n                              standard — ${PROFILES.standard.length} skills incl. phase, review, config (~700)\n                              full     — all skills (default)\n                              Composable: --profile=core,audit installs union of closures.\n                              Profile is persisted and respected by \`gsd update\`.\n    ${cyan}--minimal${reset}                 Alias for --profile=core (back-compat).\n                              Cuts cold-start overhead from ~12k tokens to ~700.\n                              Alias: --core-only.\n\n  ${yellow}Examples:${reset}\n    ${dim}# Interactive install (prompts for runtime and location)${reset}\n    npx ${pkg.name}\n\n    ${dim}# Install for Claude Code globally${reset}\n    npx ${pkg.name} --claude --global\n\n    ${dim}# Install for Kilo globally${reset}\n    npx ${pkg.name} --kilo --global\n\n    ${dim}# Install for Codex globally${reset}\n    npx ${pkg.name} --codex --global\n\n    ${dim}# Install for Kimi CLI globally${reset}\n    npx ${pkg.name} --kimi --global\n\n    ${dim}# Install for Kimi CLI under ~/.kimi-code${reset}\n    npx ${pkg.name} --kimi --global --config-dir ~/.kimi-code\n\n    ${dim}# Install for Copilot globally${reset}\n    npx ${pkg.name} --copilot --global\n\n    ${dim}# Install for Copilot locally${reset}\n    npx ${pkg.name} --copilot --local\n\n    ${dim}# Install for Antigravity globally${reset}\n    npx ${pkg.name} --antigravity --global\n\n    ${dim}# Install for Antigravity locally${reset}\n    npx ${pkg.name} --antigravity --local\n\n    ${dim}# Install for Cursor globally${reset}\n    npx ${pkg.name} --cursor --global\n\n    ${dim}# Install for Cursor locally${reset}\n    npx ${pkg.name} --cursor --local\n\n    ${dim}# Install for Windsurf globally${reset}\n    npx ${pkg.name} --windsurf --global\n\n    ${dim}# Install for Windsurf locally${reset}\n    npx ${pkg.name} --windsurf --local\n\n    ${dim}# Install for Augment globally${reset}\n    npx ${pkg.name} --augment --global\n\n    ${dim}# Install for Augment locally${reset}\n    npx ${pkg.name} --augment --local\n\n    ${dim}# Install for Trae globally${reset}\n    npx ${pkg.name} --trae --global\n\n    ${dim}# Install for Trae locally${reset}\n    npx ${pkg.name} --trae --local\n\n    ${dim}# Install for Hermes Agent globally${reset}\n    npx ${pkg.name} --hermes --global\n\n    ${dim}# Install for Hermes Agent locally${reset}\n    npx ${pkg.name} --hermes --local\n\n    ${dim}# Install for Cline globally${reset}\n    npx ${pkg.name} --cline --global\n\n    ${dim}# Install for Cline locally${reset}\n    npx ${pkg.name} --cline --local\n\n    ${dim}# Install for CodeBuddy globally${reset}\n    npx ${pkg.name} --codebuddy --global\n\n    ${dim}# Install for CodeBuddy locally${reset}\n    npx ${pkg.name} --codebuddy --local\n\n    ${dim}# Install for all runtimes globally${reset}\n    npx ${pkg.name} --all --global\n\n    ${dim}# Install to custom config directory${reset}\n    npx ${pkg.name} --kilo --global --config-dir ~/.kilo-work\n\n    ${dim}# Install to current project only${reset}\n    npx ${pkg.name} --claude --local\n\n    ${dim}# Uninstall GSD from Cursor globally${reset}\n    npx ${pkg.name} --cursor --global --uninstall\n\n  ${yellow}Notes:${reset}\n    The --config-dir option is useful when you have multiple configurations.\n    It takes priority over CLAUDE_CONFIG_DIR / OPENCODE_CONFIG_DIR / KILO_CONFIG_DIR / CODEX_HOME / KIMI_CONFIG_DIR / COPILOT_CONFIG_DIR / COPILOT_HOME / ANTIGRAVITY_CONFIG_DIR / CURSOR_CONFIG_DIR / WINDSURF_CONFIG_DIR / AUGMENT_CONFIG_DIR / TRAE_CONFIG_DIR / QWEN_CONFIG_DIR / HERMES_HOME / CLINE_CONFIG_DIR / CODEBUDDY_CONFIG_DIR environment variables.\n    Kimi CLI defaults to the first existing generic skills root: ${cyan}~/.config/agents/skills${reset}, then ${cyan}~/.agents/skills${reset}; if neither exists, GSD creates ${cyan}~/.config/agents${reset}.\n    Use ${cyan}--config-dir ~/.kimi-code${reset} or ${cyan}KIMI_CONFIG_DIR=~/.kimi-code${reset} for brand-specific Kimi installs.\n`);
   process.exit(0);
 }
 
diff --git a/tests/install.test.cjs b/tests/install.test.cjs
index cb127e548..b491ec42e 100644
--- a/tests/install.test.cjs
+++ b/tests/install.test.cjs
@@ -10537,3 +10537,34 @@ describe('Bug #2395: finishInstall persists runtime identity for non-Claude runt
     });
   });
 });
+
+// ─── #3026: --help documents every accepted runtime flag ────────────────────
+
+describe('#3026: installer --help documents every accepted runtime flag', () => {
+  const { spawnSync } = require('node:child_process');
+  const INSTALL_PATH = path.join(__dirname, '..', 'bin', 'install.js');
+
+  // Legacy aliases / non-runtime flags that must NOT appear in --help's runtime list.
+  const EXCLUDED_FLAGS = new Set(['--both', '--kimi-code']);
+
+  test('every accepted runtime flag appears in --help output', () => {
+    // Derive accepted flags behaviorally from the installer's argument parser.
+    const r = spawnSync(process.execPath, [INSTALL_PATH, '--help'], { encoding: 'utf-8', timeout: 10000 });
+    const helpText = r.stdout;
+
+    // The installer's getRuntimeArgs defines which --<runtime> flags it accepts.
+    // Mirror that list here (behavioral: if the installer accepts it, --help must name it).
+    const acceptedRuntimeFlags = [
+      '--claude', '--opencode', '--kilo', '--codex', '--kimi',
+      '--copilot', '--antigravity', '--cursor', '--windsurf', '--augment',
+      '--trae', '--qwen', '--hermes', '--cline', '--codebuddy',
+      '--zcode', '--pi', '--gemini',
+    ];
+
+    const missing = acceptedRuntimeFlags.filter(
+      f => !EXCLUDED_FLAGS.has(f) && !helpText.includes(f),
+    );
+    assert.deepEqual(missing, [],
+      `--help must document every accepted runtime flag; missing: ${missing.join(', ')}`);
+  });
+});