nanoclaw/setup/lib/claude-handoff.ts

/**
 * User-initiated handoff to interactive Claude, parallel to claude-assist.ts.
 *
 * claude-assist is for failures: it runs `claude -p` non-interactively, parses
 * a suggested command, and offers to run it. This module is for the opposite
 * case — the user is mid-flow, not stuck on an error, and wants Claude to
 * walk them through something the driver can't fully automate (Azure portal
 * clickthrough, writing a manifest, tunneling a port, etc.).
 *
 * Flow:
 *   1. Build a handoff prompt from the caller's context: channel, current
 *      step, completed steps, collected values (secrets redacted), relevant
 *      files to read.
 *   2. Spawn `claude --append-system-prompt "<context>"
 *      --permission-mode acceptEdits` with `stdio: 'inherit'` so Claude owns
 *      the terminal.
 *   3. When Claude exits (user types /exit, Ctrl-D, or closes the session),
 *      control returns to the setup driver. The driver can then re-offer the
 *      same step (e.g., "How did that go?" select).
 *
 * Also exports a small helper for text/password prompts: `validateWithHelpEscape`
 * wraps a validate callback so typing `?` triggers the handoff instead of
 * attempting to parse it as a real answer.
 */
import { execSync, spawn } from 'child_process';

import * as p from '@clack/prompts';
import k from 'kleur';

import { brandBody, note } from './theme.js';

export interface HandoffContext {
  /** Channel this handoff is happening in (e.g., 'teams'). */
  channel: string;
  /** Short name of the current step the user is stuck on. */
  step: string;
  /** Human-readable summary of what the user was trying to do at this step. */
  stepDescription: string;
  /** Checklist of sub-steps already completed (displayed as `✓ <item>`). */
  completedSteps?: string[];
  /**
   * Key/value pairs of values collected so far. Callers should redact
   * secrets before passing (e.g., show last 4 chars). Used to give Claude
   * the state of the operator's progress.
   */
  collectedValues?: Record<string, string>;
  /**
   * Repo-relative paths Claude should consider reading. Always gets
   * logs/setup.log and the relevant SKILL.md appended by the builder.
   */
  files?: string[];
}

/**
 * Spawn interactive Claude with context pre-loaded as a system-prompt
 * append. Returns when Claude exits.
 *
 * Silently no-ops (returns `false`) if `claude` isn't on PATH — setup runs
 * where the binary is guaranteed to exist (we install it in the auth step),
 * but an ultra-early flow failure could technically reach this before that
 * install, and crashing the handoff would be worse than the handoff not
 * firing.
 */
export async function offerClaudeHandoff(ctx: HandoffContext): Promise<boolean> {
  if (!isClaudeUsable()) {
    p.log.warn(
      brandBody("Claude isn't installed yet — can't hand you off here. Finish setup first, then retry."),
    );
    return false;
  }

  const systemPrompt = buildSystemPrompt(ctx);

  note(
    [
      "I'm handing you off to Claude in interactive mode.",
      "It has the context of where you are in setup.",
      "",
      k.dim("Type /exit (or press Ctrl-D) when you're ready to come back to setup."),
    ].join('\n'),
    'Handing off to Claude',
  );

  return new Promise<boolean>((resolve) => {
    const child = spawn(
      'claude',
      [
        '--append-system-prompt',
        systemPrompt,
        '--permission-mode',
        'acceptEdits',
      ],
      { stdio: 'inherit' },
    );
    child.on('close', () => {
      p.log.success(brandBody("Back from Claude. Let's continue."));
      resolve(true);
    });
    child.on('error', () => {
      p.log.error("Couldn't launch Claude. Continuing without handoff.");
      resolve(false);
    });
  });
}

/**
 * Sentinel returned by `validateWithHelpEscape` when the user types `?`.
 * The caller compares against this to decide whether to trigger a handoff.
 */
export const HELP_ESCAPE_SENTINEL = '__NANOCLAW_HELP_ESCAPE__';

/**
 * Wrap a clack `validate` callback so typing `?` short-circuits validation
 * and returns the HELP_ESCAPE_SENTINEL. Caller should check for the sentinel
 * after awaiting the prompt and trigger offerClaudeHandoff if matched.
 *
 * Usage:
 *   const answer = await p.text({
 *     message: 'Paste your Azure App ID',
 *     validate: validateWithHelpEscape((v) => {
 *       if (!/^[0-9a-f-]{36}$/.test(v)) return 'Expected a UUID';
 *       return undefined;
 *     }),
 *   });
 *   if (answer === HELP_ESCAPE_SENTINEL) { await offerClaudeHandoff(ctx); ... }
 */
export function validateWithHelpEscape(
  inner?: (value: string) => string | Error | undefined,
): (value: string) => string | Error | undefined {
  return (value: string) => {
    if ((value ?? '').trim() === '?') {
      // Returning undefined lets clack accept the `?` as the "answer". The
      // caller sees a literal "?" and should compare + escape to handoff.
      return undefined;
    }
    return inner ? inner(value) : undefined;
  };
}

/**
 * True if the value returned by a text/password prompt should trigger a
 * handoff. Abstracts the sentinel check so callers don't have to import it
 * directly at every site.
 */
export function isHelpEscape(value: unknown): boolean {
  return typeof value === 'string' && value.trim() === '?';
}

function isClaudeUsable(): boolean {
  try {
    execSync('command -v claude', { stdio: 'ignore' });
    return true;
  } catch {
    return false;
  }
}

function buildSystemPrompt(ctx: HandoffContext): string {
  const lines: string[] = [
    `The user is running NanoClaw's interactive \`setup:auto\` flow to wire the ${ctx.channel} channel.`,
    `They got stuck at the step: "${ctx.step}" (${ctx.stepDescription}) and asked for help.`,
    '',
    "Your job: help them complete this specific step and get back to setup.",
    "You can read files, run commands (with acceptEdits permissions), search the web,",
    "and explain concepts. Be concise. When they're ready to resume, tell them to type",
    "/exit and they'll return to the setup flow at the same step.",
    '',
  ];

  if (ctx.completedSteps && ctx.completedSteps.length > 0) {
    lines.push('Steps they have already completed:');
    for (const s of ctx.completedSteps) lines.push(`  ✓ ${s}`);
    lines.push('');
  }

  if (ctx.collectedValues && Object.keys(ctx.collectedValues).length > 0) {
    lines.push('Values collected so far (secrets redacted):');
    for (const [k, v] of Object.entries(ctx.collectedValues)) {
      lines.push(`  ${k}: ${v}`);
    }
    lines.push('');
  }

  const files = [
    ...(ctx.files ?? []),
    'logs/setup.log',
    'logs/setup-steps/',
    `.claude/skills/add-${ctx.channel}/SKILL.md`,
    `setup/channels/${ctx.channel}.ts`,
  ].filter((v, i, a) => a.indexOf(v) === i);

  lines.push('Relevant files (read as needed with the Read tool):');
  for (const f of files) lines.push(`  - ${f}`);

  return lines.join('\n');
}