| # SessionStart hook for superpowers plugin | |
| set -euo pipefail | |
| # Determine plugin root directory | |
| SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)" | |
| PLUGIN_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)" | |
| # Read using-superpowers content | |
| using_superpowers_content=$(cat "${PLUGIN_ROOT}/skills/using-superpowers/SKILL.md" 2>&1 || echo "Error reading using-superpowers skill") | |
| # Escape string for JSON embedding using bash parameter substitution. | |
| # Each ${s//old/new} is a single C-level pass - orders of magnitude | |
| # faster than the character-by-character loop this replaces. | |
| escape_for_json() { | |
| local s="$1" | |
| s="${s//\\/\\\\}" | |
| s="${s//\"/\\\"}" | |
| s="${s//$'\n'/\\n}" | |
| s="${s//$'\r'/\\r}" | |
| s="${s//$'\t'/\\t}" | |
| printf '%s' "$s" | |
| } | |
| using_superpowers_escaped=$(escape_for_json "$using_superpowers_content") | |
| session_context="<EXTREMELY_IMPORTANT>\nYou have superpowers.\n\n**Below is the full content of your 'superpowers:using-superpowers' skill - your introduction to using skills. For all other skills, use the 'Skill' tool:**\n\n${using_superpowers_escaped}\n</EXTREMELY_IMPORTANT>" | |
| # Output context injection as JSON. | |
| # Cursor hooks expect additional_context (snake_case). | |
| # Claude Code hooks expect hookSpecificOutput.additionalContext (nested). | |
| # Copilot CLI (v1.0.11+) and others expect additionalContext (top-level, SDK standard). | |
| # Claude Code reads BOTH additional_context and hookSpecificOutput without | |
| # deduplication, so we must emit only the field the current platform consumes. | |
| # | |
| # Uses printf instead of heredoc to work around bash 5.3+ heredoc hang. | |
| # See: https://github.com/obra/superpowers/issues/571 | |
| if [ -n "${CURSOR_PLUGIN_ROOT:-}" ]; then | |
| # Cursor sets CURSOR_PLUGIN_ROOT (may also set CLAUDE_PLUGIN_ROOT) | |
| printf '{\n "additional_context": "%s"\n}\n' "$session_context" | cat | |
| elif [ -n "${CLAUDE_PLUGIN_ROOT:-}" ] && [ -z "${COPILOT_CLI:-}" ]; then | |
| # Claude Code sets CLAUDE_PLUGIN_ROOT without COPILOT_CLI | |
| printf '{\n "hookSpecificOutput": {\n "hookEventName": "SessionStart",\n "additionalContext": "%s"\n }\n}\n' "$session_context" | cat | |
| else | |
| # Copilot CLI (sets COPILOT_CLI=1) or unknown platform — SDK standard format | |
| printf '{\n "additionalContext": "%s"\n}\n' "$session_context" | cat | |
| fi | |
| exit 0 | |