feat: add pi superpowers package extension

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 CLI](#codex-cli), [Codex App](#codex-app), [Factory Droid](#factory-droid), [Gemini CLI](#gemini-cli), [OpenCode](#opencode), [Cursor](#cursor), [GitHub Copilot CLI](#github-copilot-cli).
+Give your agent Superpowers: [Claude Code](#claude-code), [Codex CLI](#codex-cli), [Codex App](#codex-app), [Factory Droid](#factory-droid), [Gemini CLI](#gemini-cli), [Pi](#pi), [OpenCode](#opencode), [Cursor](#cursor), [GitHub Copilot CLI](#github-copilot-cli).
 
 ## How it works
 
@@ -114,6 +114,22 @@ Superpowers is available via the [official Codex plugin marketplace](https://git
   gemini extensions update superpowers
   ```
 
+### 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.
+
 ### OpenCode
 
 OpenCode uses its own plugin install; install Superpowers separately even if you

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 use the \`Skill\` tool, 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\`. Map Claude-style tool names \`Read\`, \`Write\`, \`Edit\`, and \`Bash\` to those Pi tools.
+
+Pi does not ship a standard \`Task\` 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 tool calls.
+
+Pi does not ship a standard \`TodoWrite\` 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.`;
+}
+
+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;
+}

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": [
+      "./extensions/superpowers.ts"
+    ],
+    "skills": [
+      "./skills"
+    ]
+  }
 }

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

@@ -0,0 +1,30 @@
+# Pi Tool Mapping
+
+Pi supports Superpowers skills natively through skill discovery and `/skill:name` commands. It does not expose Claude Code's `Skill` tool.
+
+When a Superpowers skill mentions Claude Code tool names, use these Pi equivalents:
+
+| Superpowers / Claude Code name | Pi equivalent |
+| --- | --- |
+| `Skill` | Pi native skills: load the relevant `SKILL.md` with `read`, or let the human use `/skill:name` |
+| `Read` | `read` |
+| `Write` | `write` |
+| `Edit` | `edit` |
+| `Bash` | `bash` |
+| `Grep` | `grep` when active; otherwise `bash` with `rg`/`grep` |
+| `Glob` | `find` or `bash` with shell globs |
+| `LS` / `List` | `ls` when active; otherwise `bash` with `ls` |
+| `Task` | Use an installed subagent tool such as `subagent` from `pi-subagents` if available |
+| `TodoWrite` | 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. 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.

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, '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, ['./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));
+  }
+});