Simplify Codex hook entrypoint

.codex-plugin/plugin.json

@@ -21,6 +21,7 @@
     "workflow"
   ],
   "skills": "./skills/",
+  "hooks": "./hooks/hooks-codex.json",
   "interface": {
     "displayName": "Superpowers",
     "shortDescription": "Planning, TDD, debugging, and delivery workflows for coding agents",

.pi/extensions/superpowers.ts

@@ -0,0 +1,121 @@
+import { readFileSync } from "node:fs";
+import { dirname, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
+
+const EXTREMELY_IMPORTANT_MARKER = "<EXTREMELY_IMPORTANT>";
+const BOOTSTRAP_MARKER = "superpowers:using-superpowers bootstrap for pi";
+
+const extensionDir = dirname(fileURLToPath(import.meta.url));
+const packageRoot = resolve(extensionDir, "../..");
+const skillsDir = resolve(packageRoot, "skills");
+const bootstrapSkillPath = resolve(skillsDir, "using-superpowers", "SKILL.md");
+
+let cachedBootstrap: string | null | undefined;
+
+export default function superpowersPiExtension(pi: ExtensionAPI) {
+	let injectBootstrap = true;
+
+	pi.on("resources_discover", async () => ({
+		skillPaths: [skillsDir],
+	}));
+
+	pi.on("session_start", async () => {
+		injectBootstrap = true;
+	});
+
+	pi.on("session_compact", async () => {
+		injectBootstrap = true;
+	});
+
+	pi.on("agent_end", async () => {
+		injectBootstrap = false;
+	});
+
+	pi.on("context", async (event) => {
+		if (!injectBootstrap) return;
+		if (event.messages.some(messageContainsBootstrap)) return;
+
+		const bootstrap = getBootstrapContent();
+		if (!bootstrap) return;
+
+		const bootstrapMessage = {
+			role: "user" as const,
+			content: [{ type: "text" as const, text: bootstrap }],
+			timestamp: Date.now(),
+		};
+
+		const insertAt = firstNonCompactionSummaryIndex(event.messages);
+		return {
+			messages: [
+				...event.messages.slice(0, insertAt),
+				bootstrapMessage,
+				...event.messages.slice(insertAt),
+			],
+		};
+	});
+}
+
+function getBootstrapContent(): string | null {
+	if (cachedBootstrap !== undefined) return cachedBootstrap;
+
+	try {
+		const skillContent = readFileSync(bootstrapSkillPath, "utf8");
+		const body = stripFrontmatter(skillContent);
+		cachedBootstrap = `${EXTREMELY_IMPORTANT_MARKER}
+${BOOTSTRAP_MARKER}
+
+You have superpowers.
+
+The using-superpowers skill content is included below and is already loaded for this Pi session. Follow it now. Do not try to load using-superpowers again.
+
+${body}
+
+${piToolMapping()}
+</EXTREMELY_IMPORTANT>`;
+		return cachedBootstrap;
+	} catch {
+		cachedBootstrap = null;
+		return null;
+	}
+}
+
+function stripFrontmatter(content: string): string {
+	const match = content.match(/^---\n[\s\S]*?\n---\n([\s\S]*)$/);
+	return (match ? match[1] : content).trim();
+}
+
+function piToolMapping(): string {
+	return `## Pi tool mapping
+
+Pi has native skills but does not expose Claude Code's \`Skill\` tool. When a Superpowers instruction says to invoke a skill, use Pi's native skill system instead: load the relevant \`SKILL.md\` with \`read\` when the skill applies, or let a human invoke \`/skill:name\` explicitly.
+
+Pi's built-in coding tools are lowercase: \`read\`, \`write\`, \`edit\`, \`bash\`, plus optional \`grep\`, \`find\`, and \`ls\`. Use those for the corresponding actions: read a file, create or edit files, run shell commands, search file contents, find files by name, and list directories.
+
+Pi does not ship a standard subagent tool. If a subagent tool such as \`subagent\` from \`pi-subagents\` is available, use it for Superpowers subagent workflows. If no subagent tool is available, do the work in this session or explain the missing capability instead of inventing \`Task\` calls.
+
+Pi does not ship a standard task-list tool. If an installed todo/task tool is available, use it. Otherwise track work in plan files or a repo-local \`TODO.md\` when task tracking is needed. Treat older \`TodoWrite\` references as this task-tracking action.`;
+}
+
+function messageContainsBootstrap(message: unknown): boolean {
+	const content = (message as { content?: unknown }).content;
+	if (typeof content === "string") return content.includes(BOOTSTRAP_MARKER);
+	if (!Array.isArray(content)) return false;
+	return content.some((part) => {
+		return (
+			part &&
+			typeof part === "object" &&
+			(part as { type?: unknown }).type === "text" &&
+			typeof (part as { text?: unknown }).text === "string" &&
+			(part as { text: string }).text.includes(BOOTSTRAP_MARKER)
+		);
+	});
+}
+
+function firstNonCompactionSummaryIndex(messages: unknown[]): number {
+	let index = 0;
+	while ((messages[index] as { role?: unknown } | undefined)?.role === "compactionSummary") {
+		index += 1;
+	}
+	return index;
+}

README.md

@@ -4,7 +4,7 @@ Superpowers is a complete software development methodology for your coding agent
 
 ## Quickstart
 
-Give your agent Superpowers: [Claude Code](#claude-code), [Codex App](#codex-app), [Codex CLI](#codex-cli), [Cursor](#cursor), [Factory Droid](#factory-droid), [Gemini CLI](#gemini-cli), [GitHub Copilot CLI](#github-copilot-cli), [OpenCode](#opencode).
+Give your agent Superpowers: [Claude Code](#claude-code), [Codex App](#codex-app), [Codex CLI](#codex-cli), [Cursor](#cursor), [Factory Droid](#factory-droid), [Gemini CLI](#gemini-cli), [GitHub Copilot CLI](#github-copilot-cli), [OpenCode](#opencode), [Pi](#pi).
 
 ## How it works
 
@@ -151,6 +151,22 @@ already use it in another harness.
 
 - Detailed docs: [docs/README.opencode.md](docs/README.opencode.md)
 
+### Pi
+
+Install Superpowers as a Pi package from this repository:
+
+```bash
+pi install git:github.com/obra/superpowers
+```
+
+For local development, run Pi with this checkout loaded as a temporary package:
+
+```bash
+pi -e /path/to/superpowers
+```
+
+The Pi package loads the Superpowers skills and a small extension that injects the `using-superpowers` bootstrap at session startup and again after compaction. Pi has native skills, so no compatibility `Skill` tool is required. Subagent and task-list tools remain optional Pi companion packages.
+
 ## The Basic Workflow
 
 1. **brainstorming** - Activates before writing code. Refines rough ideas through questions, explores alternatives, presents design in sections for validation. Saves design document.

docs/superpowers/plans/2026-05-07-pi-extension-and-evals.md

@@ -0,0 +1,143 @@
+# Pi Extension and Evals Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add first-class Pi package support for Superpowers and add Pi as a Drill eval backend.
+
+**Architecture:** The Pi package is declared in the root `package.json` and loads existing `skills/` plus a small Pi extension. The extension injects the `using-superpowers` bootstrap into provider context as a user-role message on session startup and after compaction, with Pi-specific tool mapping. Drill gains a `pi` backend, Pi session-log normalization, and tests.
+
+**Tech Stack:** Pi TypeScript extension API, Node built-in test runner, Drill Python eval harness, pytest.
+
+---
+
+### Task 1: Pi package manifest and extension tests
+
+**Files:**
+- Modify: `package.json`
+- Create: `tests/pi/test-pi-extension.mjs`
+
+- [ ] **Step 1: Write failing package/extension tests**
+
+Create `tests/pi/test-pi-extension.mjs` with tests that import `extensions/superpowers.ts`, register fake Pi handlers, and assert:
+- root `package.json` has `keywords` containing `pi-package`
+- root `package.json` has `pi.skills: ["./skills"]`
+- root `package.json` has `pi.extensions: ["./extensions/superpowers.ts"]`
+- the extension registers `resources_discover`, `session_start`, `session_compact`, `context`, and `agent_end`
+- startup `context` injects exactly one user-role bootstrap message
+- `agent_end` clears startup injection
+- `session_compact` re-enables injection
+- the extension does not register `session_before_compact`
+
+- [ ] **Step 2: Run tests and verify RED**
+
+Run: `node --experimental-strip-types --test tests/pi/test-pi-extension.mjs`
+
+Expected: FAIL because `extensions/superpowers.ts` does not exist and `package.json` lacks the `pi` manifest.
+
+- [ ] **Step 3: Implement manifest fields**
+
+Update `package.json` with `description`, `keywords`, `pi.extensions`, and `pi.skills` while preserving existing `name`, `version`, `type`, and `main`.
+
+- [ ] **Step 4: Implement `extensions/superpowers.ts`**
+
+Create a zero-runtime-dependency extension that:
+- locates the package root from `import.meta.url`
+- reads `skills/using-superpowers/SKILL.md`
+- strips YAML frontmatter
+- appends Pi-specific tool mapping
+- exposes `resources_discover` with the skills path
+- marks bootstrap pending on `session_start` and `session_compact`
+- injects a user-role bootstrap message in `context`
+- inserts post-compact bootstrap after leading `compactionSummary` messages
+- clears pending bootstrap on `agent_end`
+
+- [ ] **Step 5: Run tests and verify GREEN**
+
+Run: `node --experimental-strip-types --test tests/pi/test-pi-extension.mjs`
+
+Expected: PASS.
+
+### Task 2: Pi tool mapping reference
+
+**Files:**
+- Create: `skills/using-superpowers/references/pi-tools.md`
+- Modify: `tests/pi/test-pi-extension.mjs`
+
+- [ ] **Step 1: Write failing test for Pi reference doc**
+
+Add assertions that `skills/using-superpowers/references/pi-tools.md` exists and documents mappings for `Skill`, `Task`, `TodoWrite`, and built-in tool names.
+
+- [ ] **Step 2: Run tests and verify RED**
+
+Run: `node --experimental-strip-types --test tests/pi/test-pi-extension.mjs`
+
+Expected: FAIL because `pi-tools.md` does not exist.
+
+- [ ] **Step 3: Add Pi reference doc**
+
+Create `skills/using-superpowers/references/pi-tools.md` explaining Pi-native skills, optional `pi-subagents`, no canonical todo/tasklist plugin, and built-in lowercase tools.
+
+- [ ] **Step 4: Run tests and verify GREEN**
+
+Run: `node --experimental-strip-types --test tests/pi/test-pi-extension.mjs`
+
+Expected: PASS.
+
+### Task 3: Drill Pi backend and session log normalization
+
+**Files:**
+- Create: `evals/backends/pi.yaml`
+- Modify: `evals/drill/backend.py`
+- Modify: `evals/drill/engine.py`
+- Modify: `evals/drill/normalizer.py`
+- Modify: `evals/tests/test_backend.py`
+- Modify: `evals/tests/test_normalizer.py`
+
+- [ ] **Step 1: Write failing backend/normalizer tests**
+
+Add pytest coverage for:
+- `load_backend("pi")` returns `family == "pi"`
+- Pi backend command starts with `pi` and includes `-e ${SUPERPOWERS_ROOT}`
+- `_resolve_log_dir()` for Pi points under `~/.pi/agent/sessions`
+- `filter_pi_logs_by_cwd()` keeps only session files whose header `cwd` matches the scenario workdir
+- `normalize_pi_logs()` extracts `toolCall` blocks from Pi assistant session entries and maps built-in lowercase tools to canonical names
+
+- [ ] **Step 2: Run tests and verify RED**
+
+Run: `uv run pytest evals/tests/test_backend.py evals/tests/test_normalizer.py -q`
+
+Expected: FAIL because the Pi backend and normalizer do not exist.
+
+- [ ] **Step 3: Add `evals/backends/pi.yaml`**
+
+Configure the backend to run `pi -e ${SUPERPOWERS_ROOT}`, use permissive TUI readiness, `/quit` shutdown, and Pi session log location.
+
+- [ ] **Step 4: Implement Pi family support**
+
+Update `Backend.family`, `Engine._resolve_log_dir`, `Engine._collect_tool_calls`, and `normalizer.py` with Pi log filtering and normalizing.
+
+- [ ] **Step 5: Run tests and verify GREEN**
+
+Run: `uv run pytest evals/tests/test_backend.py evals/tests/test_normalizer.py -q`
+
+Expected: PASS.
+
+### Task 4: Documentation and full verification
+
+**Files:**
+- Modify: `README.md`
+- Modify: `evals/README.md`
+
+- [ ] **Step 1: Document Pi install and eval backend**
+
+Add Pi to README quickstart/install list and add backend entry/usage to `evals/README.md`.
+
+- [ ] **Step 2: Run verification**
+
+Run:
+```bash
+node --experimental-strip-types --test tests/pi/test-pi-extension.mjs
+uv run pytest evals/tests/test_backend.py evals/tests/test_setup.py evals/tests/test_normalizer.py -q
+```
+
+Expected: all tests pass.

hooks/hooks-codex.json

@@ -0,0 +1,16 @@
+{
+  "hooks": {
+    "SessionStart": [
+      {
+        "matcher": "startup|resume|clear",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "\"${PLUGIN_ROOT}/hooks/run-hook.cmd\" session-start-codex",
+            "async": false
+          }
+        ]
+      }
+    ]
+  }
+}

hooks/session-start

@@ -7,13 +7,6 @@ set -euo pipefail
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 PLUGIN_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
 
-# Check if legacy skills directory exists and build warning
-warning_message=""
-legacy_skills_dir="${HOME}/.config/superpowers/skills"
-if [ -d "$legacy_skills_dir" ]; then
-    warning_message="\n\n<important-reminder>IN YOUR FIRST REPLY AFTER SEEING THIS MESSAGE YOU MUST TELL THE USER:⚠️ **WARNING:** Superpowers now uses Claude Code's skills system. Custom skills in ~/.config/superpowers/skills will not be read. Move custom skills to ~/.claude/skills instead. To make this message go away, remove ~/.config/superpowers/skills</important-reminder>"
-fi
-
 # Read using-superpowers content
 using_superpowers_content=$(cat "${PLUGIN_ROOT}/skills/using-superpowers/SKILL.md" 2>&1 || echo "Error reading using-superpowers skill")
 
@@ -31,8 +24,7 @@ escape_for_json() {
 }
 
 using_superpowers_escaped=$(escape_for_json "$using_superpowers_content")
-warning_escaped=$(escape_for_json "$warning_message")
+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${using_superpowers_escaped}\n</EXTREMELY_IMPORTANT>"
-session_context="<EXTREMELY_IMPORTANT>\nYou have superpowers.\n\n**Below is the full content of your 'superpowers:using-superpowers' skill - your introduction to using skills. For all other skills, use the 'Skill' tool:**\n\n${using_superpowers_escaped}\n\n${warning_escaped}\n</EXTREMELY_IMPORTANT>"
 
 # Output context injection as JSON.
 # Cursor hooks expect additional_context (snake_case).

hooks/session-start-codex

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# Codex SessionStart hook for superpowers plugin
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PLUGIN_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
+
+using_superpowers_content=$(cat "${PLUGIN_ROOT}/skills/using-superpowers/SKILL.md" 2>&1 || echo "Error reading using-superpowers skill")
+
+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, follow the Codex skill-loading instructions in that skill:**\n\n${using_superpowers_escaped}\n</EXTREMELY_IMPORTANT>"
+
+printf '{\n  "hookSpecificOutput": {\n    "hookEventName": "SessionStart",\n    "additionalContext": "%s"\n  }\n}\n' "$session_context"
+
+exit 0

package.json

@@ -1,6 +1,23 @@
 {
   "name": "superpowers",
   "version": "5.1.0",
+  "description": "Superpowers skills and runtime bootstrap for coding agents",
   "type": "module",
-  "main": ".opencode/plugins/superpowers.js"
+  "main": ".opencode/plugins/superpowers.js",
+  "keywords": [
+    "pi-package",
+    "skills",
+    "tdd",
+    "debugging",
+    "collaboration",
+    "workflow"
+  ],
+  "pi": {
+    "extensions": [
+      "./.pi/extensions/superpowers.ts"
+    ],
+    "skills": [
+      "./skills"
+    ]
+  }
 }

scripts/sync-to-codex-plugin.sh

@@ -70,7 +70,6 @@ EXCLUDES=(
   "/commands/"
   "/docs/"
   "/evals/"
-  "/hooks/"
   "/lib/"
   "/scripts/"
   "/tests/"
@@ -420,7 +419,7 @@ if [[ $BOOTSTRAP -eq 1 ]]; then
   COMMIT_TITLE="bootstrap superpowers v$UPSTREAM_VERSION from upstream main @ $UPSTREAM_SHORT"
   PR_BODY="Initial bootstrap of the superpowers plugin from upstream \`main\` @ \`$UPSTREAM_SHORT\` (v$UPSTREAM_VERSION).
 
-Creates \`plugins/superpowers/\` by copying the tracked plugin files from upstream, including \`.codex-plugin/plugin.json\` and \`assets/\`.
+Creates \`plugins/superpowers/\` by copying the tracked plugin files from upstream, including \`.codex-plugin/plugin.json\`, \`assets/\`, and \`hooks/\`.
 
 Run via: \`scripts/sync-to-codex-plugin.sh --bootstrap\`
 Upstream commit: https://github.com/obra/superpowers/commit/$UPSTREAM_SHA
@@ -430,7 +429,7 @@ else
   COMMIT_TITLE="sync superpowers v$UPSTREAM_VERSION from upstream main @ $UPSTREAM_SHORT"
   PR_BODY="Automated sync from superpowers upstream \`main\` @ \`$UPSTREAM_SHORT\` (v$UPSTREAM_VERSION).
 
-Copies the tracked plugin files from upstream, including the committed Codex manifest and assets.
+Copies the tracked plugin files from upstream, including the committed Codex manifest, assets, and hooks.
 
 Run via: \`scripts/sync-to-codex-plugin.sh\`
 Upstream commit: https://github.com/obra/superpowers/commit/$UPSTREAM_SHA

skills/using-superpowers/SKILL.md

@@ -41,7 +41,7 @@ If CLAUDE.md, GEMINI.md, or AGENTS.md says "don't use TDD" and a skill says "alw
 
 ## Platform Adaptation
 
-Skills speak in actions ("dispatch a subagent", "create a todo", "read a file") rather than naming any one runtime's tools. For per-platform tool equivalents and instructions-file conventions, see [claude-code-tools.md](references/claude-code-tools.md), [codex-tools.md](references/codex-tools.md), [copilot-tools.md](references/copilot-tools.md), and [gemini-tools.md](references/gemini-tools.md). Gemini CLI users get the tool mapping loaded automatically via GEMINI.md.
+Skills speak in actions ("dispatch a subagent", "create a todo", "read a file") rather than naming any one runtime's tools. For per-platform tool equivalents and instructions-file conventions, see [claude-code-tools.md](references/claude-code-tools.md), [codex-tools.md](references/codex-tools.md), [copilot-tools.md](references/copilot-tools.md), [gemini-tools.md](references/gemini-tools.md), and [pi-tools.md](references/pi-tools.md). Gemini CLI users get the tool mapping loaded automatically via GEMINI.md.
 
 # Using Skills
 

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

@@ -0,0 +1,28 @@
+# Pi Tool Mapping
+
+Skills speak in actions ("dispatch a subagent", "create a todo", "read a file"). On Pi these resolve to the tools below.
+
+| Action skills request | Pi equivalent |
+| --- | --- |
+| Invoke a skill | Pi native skills: load the relevant `SKILL.md` with `read`, or let the human use `/skill:name` |
+| Read a file | `read` |
+| Create a file | `write` |
+| Edit a file | `edit` |
+| Run a shell command | `bash` |
+| Search file contents | `grep` when active; otherwise `bash` with `rg`/`grep` |
+| Find files by name | `find` or `bash` with shell globs |
+| List files and subdirectories | `ls` when active; otherwise `bash` with `ls` |
+| Dispatch a subagent (`Subagent (general-purpose):` template) | Use an installed subagent tool such as `subagent` from `pi-subagents` if available |
+| Task tracking ("create a todo", "mark complete") | Use an installed todo/task tool if available, otherwise track tasks in the plan or `TODO.md` |
+
+## Skills
+
+Pi discovers skills from configured skill directories and installed Pi packages. A Superpowers Pi package should expose `skills/` through its `pi.skills` manifest entry. Pi does not expose Claude Code's `Skill` tool, but the agent should still follow the Superpowers rule: when a skill applies, load and follow it before responding.
+
+## Subagents
+
+Pi core does not ship a standard subagent tool. The `pi-subagents` package is a strong optional companion and provides a `subagent` tool with single-agent, chain, parallel, async, forked-context, and resume/status workflows. If no subagent tool is available, do not fabricate `Task` calls; execute sequentially in the current session or explain that the optional subagent capability is not installed.
+
+## Task lists
+
+Pi core does not ship a standard task-list tool. If a todo/task extension is installed, use its documented tool. Otherwise use Superpowers plan files, checklists in Markdown, or a repo-local `TODO.md` for task tracking. Older Superpowers docs may refer to `TodoWrite`; treat that as the task-tracking action above.

tests/codex-plugin-sync/test-sync-to-codex-plugin.sh

@@ -178,6 +178,7 @@ write_upstream_fixture() {
         "$repo/.private-journal" \
         "$repo/assets" \
         "$repo/evals/drill" \
+        "$repo/hooks" \
         "$repo/scripts" \
         "$repo/skills/example"
 
@@ -218,6 +219,40 @@ EOF
     printf 'png fixture\n' > "$repo/assets/app-icon.png"
     printf 'eval harness fixture\n' > "$repo/evals/drill/README.md"
 
+    cat > "$repo/hooks/hooks-codex.json" <<'EOF'
+{
+  "hooks": {
+    "SessionStart": [
+      {
+        "matcher": "startup|resume|clear",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "\"${PLUGIN_ROOT}/hooks/run-hook.cmd\" session-start-codex",
+            "async": false
+          }
+        ]
+      }
+    ]
+  }
+}
+EOF
+
+    cat > "$repo/hooks/session-start" <<'EOF'
+#!/usr/bin/env sh
+echo "session-start fixture"
+EOF
+    cat > "$repo/hooks/session-start-codex" <<'EOF'
+#!/usr/bin/env sh
+echo "session-start-codex fixture"
+EOF
+
+    cat > "$repo/hooks/run-hook.cmd" <<'EOF'
+@echo off
+echo run-hook fixture
+EOF
+    chmod +x "$repo/hooks/session-start" "$repo/hooks/session-start-codex" "$repo/hooks/run-hook.cmd"
+
     cat > "$repo/skills/example/SKILL.md" <<'EOF'
 # Example Skill
 
@@ -236,6 +271,10 @@ EOF
         assets/app-icon.png \
         assets/superpowers-small.svg \
         evals/drill/README.md \
+        hooks/hooks-codex.json \
+        hooks/run-hook.cmd \
+        hooks/session-start \
+        hooks/session-start-codex \
         package.json \
         scripts/sync-to-codex-plugin.sh \
         skills/example/SKILL.md
@@ -293,6 +332,7 @@ write_synced_destination_fixture() {
         "$repo/plugins/superpowers/.codex-plugin" \
         "$repo/plugins/superpowers/.private-journal" \
         "$repo/plugins/superpowers/assets" \
+        "$repo/plugins/superpowers/hooks" \
         "$repo/plugins/superpowers/skills/example/agents" \
         "$repo/plugins/superpowers/skills/example"
 
@@ -309,6 +349,40 @@ EOF
 
     printf 'png fixture\n' > "$repo/plugins/superpowers/assets/app-icon.png"
 
+    cat > "$repo/plugins/superpowers/hooks/hooks-codex.json" <<'EOF'
+{
+  "hooks": {
+    "SessionStart": [
+      {
+        "matcher": "startup|resume|clear",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "\"${PLUGIN_ROOT}/hooks/run-hook.cmd\" session-start-codex",
+            "async": false
+          }
+        ]
+      }
+    ]
+  }
+}
+EOF
+
+    cat > "$repo/plugins/superpowers/hooks/session-start" <<'EOF'
+#!/usr/bin/env sh
+echo "session-start fixture"
+EOF
+    cat > "$repo/plugins/superpowers/hooks/session-start-codex" <<'EOF'
+#!/usr/bin/env sh
+echo "session-start-codex fixture"
+EOF
+
+    cat > "$repo/plugins/superpowers/hooks/run-hook.cmd" <<'EOF'
+@echo off
+echo run-hook fixture
+EOF
+    chmod +x "$repo/plugins/superpowers/hooks/session-start" "$repo/plugins/superpowers/hooks/session-start-codex" "$repo/plugins/superpowers/hooks/run-hook.cmd"
+
     cat > "$repo/plugins/superpowers/skills/example/SKILL.md" <<'EOF'
 # Example Skill
 
@@ -327,6 +401,10 @@ EOF
         plugins/superpowers/.codex-plugin/plugin.json \
         plugins/superpowers/assets/app-icon.png \
         plugins/superpowers/assets/superpowers-small.svg \
+        plugins/superpowers/hooks/hooks-codex.json \
+        plugins/superpowers/hooks/run-hook.cmd \
+        plugins/superpowers/hooks/session-start \
+        plugins/superpowers/hooks/session-start-codex \
         plugins/superpowers/skills/example/agents/openai.yaml \
         plugins/superpowers/skills/example/SKILL.md \
         plugins/superpowers/.private-journal/keep.txt
@@ -542,6 +620,10 @@ main() {
     assert_contains "$preview_section" ".codex-plugin/plugin.json" "Preview includes manifest path"
     assert_contains "$preview_section" "assets/superpowers-small.svg" "Preview includes SVG asset"
     assert_contains "$preview_section" "assets/app-icon.png" "Preview includes PNG asset"
+    assert_contains "$preview_section" "hooks/hooks-codex.json" "Preview includes Codex hook manifest"
+    assert_contains "$preview_section" "hooks/session-start" "Preview includes session-start hook"
+    assert_contains "$preview_section" "hooks/session-start-codex" "Preview includes Codex session-start hook"
+    assert_contains "$preview_section" "hooks/run-hook.cmd" "Preview includes hook command wrapper"
     assert_contains "$preview_section" ".private-journal/keep.txt" "Preview includes tracked ignored file"
     assert_not_contains "$preview_section" ".private-journal/leak.txt" "Preview excludes ignored untracked file"
     assert_not_contains "$preview_section" "ignored-cache/" "Preview excludes pure ignored directories"

tests/hooks/test-session-start.sh

@@ -0,0 +1,240 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+HOOK_UNDER_TEST="$REPO_ROOT/hooks/session-start"
+CODEX_HOOK_UNDER_TEST="$REPO_ROOT/hooks/session-start-codex"
+WRAPPER_UNDER_TEST="$REPO_ROOT/hooks/run-hook.cmd"
+
+FAILURES=0
+TEST_ROOT="$(mktemp -d)"
+
+cleanup() {
+    rm -rf "$TEST_ROOT"
+}
+trap cleanup EXIT
+
+pass() {
+    echo "  [PASS] $1"
+}
+
+fail() {
+    echo "  [FAIL] $1"
+    FAILURES=$((FAILURES + 1))
+}
+
+make_home() {
+    local name="$1"
+    local home="$TEST_ROOT/$name/home"
+    mkdir -p "$home"
+    printf '%s\n' "$home"
+}
+
+assert_command_output() {
+    local description="$1"
+    local shape="$2"
+    local contains="$3"
+    local not_contains="$4"
+    local home="$5"
+    shift 5
+
+    local output
+    if ! output="$(env -i PATH="${PATH:-}" HOME="$home" "$@" 2>&1)"; then
+        fail "$description"
+        echo "    hook exited non-zero"
+        echo "$output" | sed 's/^/      /'
+        return
+    fi
+
+    if printf '%s' "$output" | \
+        EXPECT_SHAPE="$shape" \
+        EXPECT_CONTAINS="$contains" \
+        EXPECT_NOT_CONTAINS="$not_contains" \
+        node -e '
+const fs = require("fs");
+
+const input = fs.readFileSync(0, "utf8");
+let payload;
+try {
+  payload = JSON.parse(input);
+} catch (error) {
+  console.error(`invalid JSON: ${error.message}`);
+  process.exit(1);
+}
+
+function hasOwn(object, key) {
+  return Object.prototype.hasOwnProperty.call(object, key);
+}
+
+function fail(message) {
+  console.error(message);
+  process.exit(1);
+}
+
+const shape = process.env.EXPECT_SHAPE;
+let context;
+
+if (shape === "nested") {
+  if (!hasOwn(payload, "hookSpecificOutput")) {
+    fail("missing hookSpecificOutput");
+  }
+  if (hasOwn(payload, "additional_context") || hasOwn(payload, "additionalContext")) {
+    fail("nested output also included a top-level context field");
+  }
+  const hookOutput = payload.hookSpecificOutput;
+  if (!hookOutput || typeof hookOutput !== "object" || Array.isArray(hookOutput)) {
+    fail("hookSpecificOutput is not an object");
+  }
+  if (hookOutput.hookEventName !== "SessionStart") {
+    fail(`unexpected hookEventName: ${hookOutput.hookEventName}`);
+  }
+  context = hookOutput.additionalContext;
+} else if (shape === "cursor") {
+  if (hasOwn(payload, "hookSpecificOutput")) {
+    fail("cursor output included hookSpecificOutput");
+  }
+  if (!hasOwn(payload, "additional_context")) {
+    fail("cursor output missing additional_context");
+  }
+  if (hasOwn(payload, "additionalContext")) {
+    fail("cursor output included additionalContext");
+  }
+  context = payload.additional_context;
+} else if (shape === "sdk") {
+  if (hasOwn(payload, "hookSpecificOutput")) {
+    fail("sdk output included hookSpecificOutput");
+  }
+  if (!hasOwn(payload, "additionalContext")) {
+    fail("sdk output missing additionalContext");
+  }
+  if (hasOwn(payload, "additional_context")) {
+    fail("sdk output included additional_context");
+  }
+  context = payload.additionalContext;
+} else {
+  fail(`unknown expected shape: ${shape}`);
+}
+
+if (typeof context !== "string" || context.trim() === "") {
+  fail("injected context was empty");
+}
+
+const expectedText = process.env.EXPECT_CONTAINS || "";
+if (expectedText && !context.includes(expectedText)) {
+  fail(`context did not contain expected text: ${expectedText}`);
+}
+
+const forbiddenTexts = (process.env.EXPECT_NOT_CONTAINS || "")
+  .split("\u001f")
+  .filter(Boolean);
+for (const forbiddenText of forbiddenTexts) {
+  if (context.includes(forbiddenText)) {
+    fail(`context contained forbidden text: ${forbiddenText}`);
+  }
+}
+'; then
+        pass "$description"
+    else
+        fail "$description"
+        echo "    output:"
+        echo "$output" | sed 's/^/      /'
+    fi
+}
+
+echo "SessionStart hook output tests"
+
+claude_home="$(make_home claude-code)"
+assert_command_output \
+    "Claude Code emits nested SessionStart additionalContext" \
+    "nested" \
+    "" \
+    "" \
+    "$claude_home" \
+    CLAUDE_PLUGIN_ROOT="$REPO_ROOT" \
+    bash "$HOOK_UNDER_TEST"
+
+codex_home="$(make_home codex-plugin-hooks)"
+codex_data="$TEST_ROOT/codex-plugin-hooks/data"
+mkdir -p "$codex_data"
+assert_command_output \
+    "Codex plugin hooks use dedicated script and emit nested SessionStart additionalContext" \
+    "nested" \
+    "" \
+    "" \
+    "$codex_home" \
+    PLUGIN_DATA="$codex_data" \
+    CLAUDE_PLUGIN_DATA="$codex_data" \
+    PLUGIN_ROOT="$REPO_ROOT" \
+    CLAUDE_PLUGIN_ROOT="$REPO_ROOT" \
+    bash "$CODEX_HOOK_UNDER_TEST"
+
+codex_wrapper_home="$(make_home codex-wrapper)"
+codex_wrapper_data="$TEST_ROOT/codex-wrapper/data"
+mkdir -p "$codex_wrapper_data"
+assert_command_output \
+    "Codex wrapper path dispatches to dedicated script" \
+    "nested" \
+    "" \
+    "" \
+    "$codex_wrapper_home" \
+    PLUGIN_DATA="$codex_wrapper_data" \
+    CLAUDE_PLUGIN_DATA="$codex_wrapper_data" \
+    PLUGIN_ROOT="$REPO_ROOT" \
+    CLAUDE_PLUGIN_ROOT="$REPO_ROOT" \
+    bash "$WRAPPER_UNDER_TEST" session-start-codex
+
+cursor_home="$(make_home cursor)"
+assert_command_output \
+    "Cursor emits top-level additional_context only" \
+    "cursor" \
+    "" \
+    "" \
+    "$cursor_home" \
+    CURSOR_PLUGIN_ROOT="$REPO_ROOT" \
+    CLAUDE_PLUGIN_ROOT="$REPO_ROOT" \
+    bash "$HOOK_UNDER_TEST"
+
+copilot_home="$(make_home copilot-cli)"
+assert_command_output \
+    "Copilot CLI emits top-level additionalContext only" \
+    "sdk" \
+    "" \
+    "" \
+    "$copilot_home" \
+    COPILOT_CLI=1 \
+    CLAUDE_PLUGIN_ROOT="$REPO_ROOT" \
+    bash "$HOOK_UNDER_TEST"
+
+legacy_home="$(make_home legacy-warning-removed)"
+mkdir -p "$legacy_home/.config/superpowers/skills"
+assert_command_output \
+    "SessionStart omits obsolete legacy custom-skill warning" \
+    "nested" \
+    "" \
+    "Superpowers now uses"$'\037'"~/.config/superpowers/skills"$'\037'"~/.claude/skills"$'\037'"legacy" \
+    "$legacy_home" \
+    CLAUDE_PLUGIN_ROOT="$REPO_ROOT" \
+    bash "$HOOK_UNDER_TEST"
+
+codex_legacy_home="$(make_home codex-legacy-warning-removed)"
+codex_legacy_data="$TEST_ROOT/codex-legacy-warning-removed/data"
+mkdir -p "$codex_legacy_home/.config/superpowers/skills" "$codex_legacy_data"
+assert_command_output \
+    "Codex SessionStart omits obsolete legacy custom-skill warning" \
+    "nested" \
+    "" \
+    "Superpowers now uses"$'\037'"~/.config/superpowers/skills"$'\037'"~/.claude/skills"$'\037'"legacy" \
+    "$codex_legacy_home" \
+    PLUGIN_DATA="$codex_legacy_data" \
+    CLAUDE_PLUGIN_DATA="$codex_legacy_data" \
+    PLUGIN_ROOT="$REPO_ROOT" \
+    CLAUDE_PLUGIN_ROOT="$REPO_ROOT" \
+    bash "$CODEX_HOOK_UNDER_TEST"
+
+if [[ "$FAILURES" -gt 0 ]]; then
+    echo "STATUS: FAILED ($FAILURES failure(s))"
+    exit 1
+fi
+
+echo "STATUS: PASSED"

tests/pi/test-pi-extension.mjs

@@ -0,0 +1,128 @@
+import assert from 'node:assert/strict';
+import { readFile } from 'node:fs/promises';
+import { existsSync } from 'node:fs';
+import { dirname, resolve } from 'node:path';
+import { fileURLToPath, pathToFileURL } from 'node:url';
+import test from 'node:test';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const repoRoot = resolve(__dirname, '../..');
+const packageJsonPath = resolve(repoRoot, 'package.json');
+const extensionPath = resolve(repoRoot, '.pi/extensions/superpowers.ts');
+const piToolsPath = resolve(repoRoot, 'skills/using-superpowers/references/pi-tools.md');
+
+async function readPackageJson() {
+  return JSON.parse(await readFile(packageJsonPath, 'utf8'));
+}
+
+async function loadExtension() {
+  const handlers = new Map();
+  const pi = {
+    on(event, handler) {
+      if (!handlers.has(event)) handlers.set(event, []);
+      handlers.get(event).push(handler);
+    },
+  };
+  const mod = await import(pathToFileURL(extensionPath).href + `?cachebust=${Date.now()}-${Math.random()}`);
+  mod.default(pi);
+  return { handlers };
+}
+
+function firstHandler(handlers, event) {
+  const eventHandlers = handlers.get(event) ?? [];
+  assert.equal(eventHandlers.length, 1, `expected one ${event} handler`);
+  return eventHandlers[0];
+}
+
+function textOf(message) {
+  if (typeof message.content === 'string') return message.content;
+  return message.content
+    .filter((part) => part.type === 'text')
+    .map((part) => part.text)
+    .join('\n');
+}
+
+test('package.json declares a pi package with skills and extension resources', async () => {
+  const pkg = await readPackageJson();
+
+  assert.equal(pkg.name, 'superpowers');
+  assert.ok(pkg.keywords.includes('pi-package'));
+  assert.deepEqual(pkg.pi.skills, ['./skills']);
+  assert.deepEqual(pkg.pi.extensions, ['./.pi/extensions/superpowers.ts']);
+});
+
+test('extension registers lifecycle hooks without pre-compaction injection', async () => {
+  const { handlers } = await loadExtension();
+
+  for (const event of ['resources_discover', 'session_start', 'session_compact', 'context', 'agent_end']) {
+    assert.equal((handlers.get(event) ?? []).length, 1, `missing ${event} handler`);
+  }
+  assert.equal((handlers.get('session_before_compact') ?? []).length, 0);
+});
+
+test('resources_discover contributes the bundled skills directory', async () => {
+  const { handlers } = await loadExtension();
+  const discover = firstHandler(handlers, 'resources_discover');
+
+  const result = await discover({ type: 'resources_discover', cwd: repoRoot, reason: 'startup' }, {});
+
+  assert.deepEqual(result.skillPaths, [resolve(repoRoot, 'skills')]);
+});
+
+test('startup context injects the bootstrap as one user message until agent_end', async () => {
+  const { handlers } = await loadExtension();
+  const sessionStart = firstHandler(handlers, 'session_start');
+  const context = firstHandler(handlers, 'context');
+  const agentEnd = firstHandler(handlers, 'agent_end');
+
+  await sessionStart({ type: 'session_start', reason: 'startup' }, {});
+
+  const originalMessages = [
+    { role: 'user', content: [{ type: 'text', text: 'Let us make a react todo list' }], timestamp: 1 },
+  ];
+  const result = await context({ type: 'context', messages: originalMessages }, {});
+
+  assert.equal(result.messages.length, 2);
+  assert.equal(result.messages[0].role, 'user');
+  assert.match(textOf(result.messages[0]), /You have superpowers/);
+  assert.match(textOf(result.messages[0]), /Pi tool mapping/);
+  assert.equal(result.messages[1], originalMessages[0]);
+
+  const repeatedProviderRequest = await context({ type: 'context', messages: originalMessages }, {});
+  assert.equal(repeatedProviderRequest.messages.length, 2);
+  assert.match(textOf(repeatedProviderRequest.messages[0]), /You have superpowers/);
+
+  const alreadyInjected = await context({ type: 'context', messages: result.messages }, {});
+  assert.equal(alreadyInjected, undefined, 'bootstrap should not duplicate when already present');
+
+  await agentEnd({ type: 'agent_end', messages: [] }, {});
+  const afterEnd = await context({ type: 'context', messages: originalMessages }, {});
+  assert.equal(afterEnd, undefined, 'startup bootstrap should clear after agent_end');
+});
+
+test('session_compact injects bootstrap after compaction summaries, not before compaction', async () => {
+  const { handlers } = await loadExtension();
+  const sessionCompact = firstHandler(handlers, 'session_compact');
+  const context = firstHandler(handlers, 'context');
+
+  await sessionCompact({ type: 'session_compact', compactionEntry: {}, fromExtension: false }, {});
+
+  const summary = { role: 'compactionSummary', summary: 'Prior work summary', tokensBefore: 123, timestamp: 1 };
+  const user = { role: 'user', content: [{ type: 'text', text: 'Continue' }], timestamp: 2 };
+  const result = await context({ type: 'context', messages: [summary, user] }, {});
+
+  assert.equal(result.messages.length, 3);
+  assert.equal(result.messages[0], summary);
+  assert.equal(result.messages[1].role, 'user');
+  assert.match(textOf(result.messages[1]), /You have superpowers/);
+  assert.equal(result.messages[2], user);
+});
+
+test('pi tools reference documents pi-specific mappings', async () => {
+  assert.equal(existsSync(piToolsPath), true, 'pi-tools.md should exist');
+  const text = await readFile(piToolsPath, 'utf8');
+
+  for (const expected of ['Skill', 'Task', 'TodoWrite', 'read', 'write', 'edit', 'bash']) {
+    assert.match(text, new RegExp(expected));
+  }
+});