Remove session scope language from SUBAGENT-STOP

Drop 'top-level sessions only' which may cause the model to treat
using-superpowers as a first-turn-only skill, breaking skill chaining
on follow-up turns.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitattributes

@@ -1,5 +1,6 @@
 # Ensure shell scripts always have LF line endings
 *.sh text eol=lf
+hooks/session-start text eol=lf
 
 # Ensure the polyglot wrapper keeps LF (it's parsed by both cmd and bash)
 *.cmd text eol=lf

docs/README.codex.md

@@ -32,6 +32,12 @@ Fetch and follow instructions from https://raw.githubusercontent.com/obra/superp
 
 3. Restart Codex.
 
+4. **For subagent skills** (optional): Skills like `dispatching-parallel-agents` and `subagent-driven-development` require Codex's collab feature. Add to your Codex config:
+   ```toml
+   [features]
+   collab = true
+   ```
+
 ### Windows
 
 Use a junction instead of a symlink (works without Developer Mode):

hooks/hooks.json

@@ -6,7 +6,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "${CLAUDE_PLUGIN_ROOT}/hooks/session-start.sh",
+            "command": "${CLAUDE_PLUGIN_ROOT}/hooks/run-hook.cmd session-start",
             "async": true
           }
         ]

hooks/run-hook.cmd

@@ -1,43 +1,46 @@
 : << 'CMDBLOCK'
 @echo off
-REM ============================================================================
-REM DEPRECATED: This polyglot wrapper is no longer used as of Claude Code 2.1.x
-REM ============================================================================
+REM Cross-platform polyglot wrapper for hook scripts.
+REM On Windows: cmd.exe runs the batch portion, which finds and calls bash.
+REM On Unix: the shell interprets this as a script (: is a no-op in bash).
 REM
-REM Claude Code 2.1.x changed the Windows execution model for hooks:
+REM Hook scripts use extensionless filenames (e.g. "session-start" not
+REM "session-start.sh") so Claude Code's Windows auto-detection -- which
+REM prepends "bash" to any command containing .sh -- doesn't interfere.
 REM
-REM   Before (2.0.x): Hooks ran with shell:true, using the system default shell.
-REM                   This wrapper provided cross-platform compatibility by
-REM                   being both a valid .cmd file (Windows) and bash script.
-REM
-REM   After (2.1.x):  Claude Code now auto-detects .sh files in hook commands
-REM                   and prepends "bash " on Windows. This broke the wrapper
-REM                   because the command:
-REM                     "run-hook.cmd" session-start.sh
-REM                   became:
-REM                     bash "run-hook.cmd" session-start.sh
-REM                   ...and bash cannot execute a .cmd file.
-REM
-REM The fix: hooks.json now calls session-start.sh directly. Claude Code 2.1.x
-REM handles the bash invocation automatically on Windows.
-REM
-REM This file is kept for reference and potential backward compatibility.
-REM ============================================================================
-REM
-REM Original purpose: Polyglot wrapper to run .sh scripts cross-platform
 REM Usage: run-hook.cmd <script-name> [args...]
-REM The script should be in the same directory as this wrapper
 
 if "%~1"=="" (
     echo run-hook.cmd: missing script name >&2
     exit /b 1
 )
-"C:\Program Files\Git\bin\bash.exe" -l "%~dp0%~1" %2 %3 %4 %5 %6 %7 %8 %9
-exit /b
+
+set "HOOK_DIR=%~dp0"
+
+REM Try Git for Windows bash in standard locations
+if exist "C:\Program Files\Git\bin\bash.exe" (
+    "C:\Program Files\Git\bin\bash.exe" "%HOOK_DIR%%~1" %2 %3 %4 %5 %6 %7 %8 %9
+    exit /b %ERRORLEVEL%
+)
+if exist "C:\Program Files (x86)\Git\bin\bash.exe" (
+    "C:\Program Files (x86)\Git\bin\bash.exe" "%HOOK_DIR%%~1" %2 %3 %4 %5 %6 %7 %8 %9
+    exit /b %ERRORLEVEL%
+)
+
+REM Try bash on PATH (e.g. user-installed Git Bash, MSYS2, Cygwin)
+where bash >nul 2>nul
+if %ERRORLEVEL% equ 0 (
+    bash "%HOOK_DIR%%~1" %2 %3 %4 %5 %6 %7 %8 %9
+    exit /b %ERRORLEVEL%
+)
+
+REM No bash found - exit silently rather than error
+REM (plugin still works, just without SessionStart context injection)
+exit /b 0
 CMDBLOCK
 
-# Unix shell runs from here
-SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+# Unix: run the named script directly
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]:-$0}")" && pwd)"
 SCRIPT_NAME="$1"
 shift
-"${SCRIPT_DIR}/${SCRIPT_NAME}" "$@"
+exec bash "${SCRIPT_DIR}/${SCRIPT_NAME}" "$@"

skills/using-superpowers/SKILL.md

@@ -3,6 +3,10 @@ name: using-superpowers
 description: Use when starting any conversation - establishes how to find and use skills, requiring Skill tool invocation before ANY response including clarifying questions
 ---
 
+<SUBAGENT-STOP>
+If you were dispatched as a subagent to execute a specific task, skip this skill.
+</SUBAGENT-STOP>
+
 <EXTREMELY-IMPORTANT>
 If you think there is even a 1% chance a skill might apply to what you are doing, you ABSOLUTELY MUST invoke the skill.
 
@@ -27,6 +31,10 @@ If CLAUDE.md says "don't use TDD" and a skill says "always use TDD," follow CLAU
 
 **In other environments:** Check your platform's documentation for how skills are loaded.
 
+## Platform Adaptation
+
+Skills use Claude Code tool names. Non-CC platforms: see `references/codex-tools.md` for tool equivalents.
+
 # Using Skills
 
 ## The Rule

skills/using-superpowers/references/codex-tools.md

@@ -0,0 +1,25 @@
+# Codex Tool Mapping
+
+Skills use Claude Code tool names. When you encounter these in a skill, use your platform equivalent:
+
+| Skill references | Codex equivalent |
+|-----------------|------------------|
+| `Task` tool (dispatch subagent) | `spawn_agent` |
+| Multiple `Task` calls (parallel) | Multiple `spawn_agent` calls |
+| Task returns result | `wait` |
+| Task completes automatically | `close_agent` to free slot |
+| `TodoWrite` (task tracking) | `update_plan` |
+| `Skill` tool (invoke a skill) | Skills load natively — just follow the instructions |
+| `Read`, `Write`, `Edit` (files) | Use your native file tools |
+| `Bash` (run commands) | Use your native shell tools |
+
+## Subagent dispatch requires collab
+
+Add to your Codex config (`~/.codex/config.toml`):
+
+```toml
+[features]
+collab = true
+```
+
+This enables `spawn_agent`, `wait`, and `close_agent` for skills like `dispatching-parallel-agents` and `subagent-driven-development`.