diff --git a/packages/cli/bin/journal.js b/packages/cli/bin/journal.js
new file mode 100644
index 0000000..94db200
--- /dev/null
+++ b/packages/cli/bin/journal.js
@@ -0,0 +1,7 @@
+#!/usr/bin/env node
+import { main } from '../src/cli.js';
+
+main(process.argv.slice(2)).catch((err) => {
+  console.error(`journal: ${err.message}`);
+  process.exit(1);
+});
diff --git a/packages/cli/package.json b/packages/cli/package.json
new file mode 100644
index 0000000..2fdfa9f
--- /dev/null
+++ b/packages/cli/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "@solo/cli",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "description": "The `journal` command: rolls dice, consults the oracle, and validates campaigns.",
+  "bin": {
+    "journal": "bin/journal.js"
+  },
+  "dependencies": {
+    "@solo/oracle": "workspace:*"
+  }
+}
diff --git a/packages/cli/src/cli.js b/packages/cli/src/cli.js
new file mode 100644
index 0000000..32395cc
--- /dev/null
+++ b/packages/cli/src/cli.js
@@ -0,0 +1,583 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath, pathToFileURL } from 'node:url';
+import {
+  rollDie,
+  rollExpr,
+  oracle as rollOracle,
+  parseTable,
+  tableRange,
+  rollTable,
+} from '@solo/oracle';
+
+const HERE = path.dirname(fileURLToPath(import.meta.url));
+
+const REQUIRED_DIRS = [
+  'world/locations',
+  'world/npcs',
+  'world/factions',
+  'characters',
+  'state',
+  'sessions',
+];
+
+const HELP = `journal — solo journaling tooling
+
+Usage:
+  journal roll <table> [--campaign <name>] [--game <id>] [--tag <tag>] [--count <n>]
+  journal oracle [<question>] [--complicate] [--campaign <name>] [--game <id>] [--table <name>]
+  journal dice <expr>
+  journal tables [--campaign <name>] [--game <id>]
+  journal check [--campaign <name>] [--game <id>]
+  journal new-campaign <name> [--game <id>]
+  journal games
+  journal game [<id>]
+  journal <game-command> [...]          provided by the campaign's game package
+
+Context:
+  Tables are looked up in the campaign first, then the campaign's game.
+  Pass --campaign <name>, set JOURNAL_CAMPAIGN, or have exactly one campaign.
+  Pass --game <id> to work with a game without a campaign.
+
+Examples:
+  journal roll sparks --campaign ashfall
+  journal oracle "Is the gate locked?" --complicate --campaign ashfall
+  journal background --campaign ashfall
+  journal dice 2d6+1
+`;
+
+/**
+ * @param {string[]} argv
+ * @returns {{ positional: string[], flags: Record<string, string | true> }}
+ */
+function parseArgs(argv) {
+  const positional = [];
+  const flags = {};
+
+  for (let i = 0; i < argv.length; i++) {
+    const arg = argv[i];
+    if (arg.startsWith('--')) {
+      const [key, inline] = arg.slice(2).split('=');
+      if (inline !== undefined) {
+        flags[key] = inline;
+      } else if (argv[i + 1] && !argv[i + 1].startsWith('--')) {
+        flags[key] = argv[++i];
+      } else {
+        flags[key] = true;
+      }
+    } else {
+      positional.push(arg);
+    }
+  }
+
+  return { positional, flags };
+}
+
+/** Walk upward until the workspace root is found. */
+function findRoot(start) {
+  let dir = start;
+  for (;;) {
+    if (fs.existsSync(path.join(dir, 'pnpm-workspace.yaml'))) return dir;
+    const parent = path.dirname(dir);
+    if (parent === dir) {
+      throw new Error('Could not locate project root (pnpm-workspace.yaml)');
+    }
+    dir = parent;
+  }
+}
+
+function subdirectories(dir) {
+  if (!fs.existsSync(dir)) return [];
+  return fs
+    .readdirSync(dir, { withFileTypes: true })
+    .filter((d) => d.isDirectory())
+    .map((d) => d.name)
+    .sort();
+}
+
+/**
+ * Read the scalar keys from a markdown file's YAML frontmatter. Only the flat
+ * `key: value` shape is supported, which is all the campaign header needs.
+ */
+function readFrontmatter(file) {
+  if (!fs.existsSync(file)) return {};
+  const text = fs.readFileSync(file, 'utf8').replace(/\r\n/g, '\n');
+  if (!text.startsWith('---')) return {};
+
+  const end = text.indexOf('\n---', 3);
+  if (end === -1) return {};
+
+  const out = {};
+  for (const line of text.slice(3, end).split('\n')) {
+    const match = line.match(/^([A-Za-z0-9_-]+):\s*(.*)$/);
+    if (match) out[match[1]] = match[2].trim().replace(/^["']|["']$/g, '');
+  }
+  return out;
+}
+
+/**
+ * Resolve the campaign from flags/env, without touching the games directory.
+ *
+ * @returns {{ root: string, campaignsDir: string, gamesDir: string,
+ *            campaignDir: string | null, campaign: object | null }}
+ */
+function resolveCampaign(flags) {
+  const root = findRoot(HERE);
+  const campaignsDir = path.join(root, 'campaigns');
+  const gamesDir = path.join(root, 'games');
+
+  const requested =
+    typeof flags.campaign === 'string' ? flags.campaign : process.env.JOURNAL_CAMPAIGN;
+  const real = subdirectories(campaignsDir).filter((n) => !n.startsWith('_'));
+
+  let campaignDir = null;
+  if (requested) {
+    campaignDir = path.join(campaignsDir, requested);
+    if (!fs.existsSync(campaignDir)) {
+      throw new Error(
+        `No such campaign: ${requested}\nAvailable: ${real.join(', ') || '(none)'}`,
+      );
+    }
+  } else if (real.length === 1) {
+    campaignDir = path.join(campaignsDir, real[0]);
+  } else if (real.length > 1 && typeof flags.game !== 'string') {
+    throw new Error(
+      `Multiple campaigns found; pass --campaign <name>.\nAvailable: ${real.join(', ')}`,
+    );
+  }
+
+  const campaign = campaignDir
+    ? { name: path.basename(campaignDir), ...readFrontmatter(path.join(campaignDir, 'campaign.md')) }
+    : null;
+
+  return { root, campaignsDir, gamesDir, campaignDir, campaign };
+}
+
+/**
+ * Load a game package's manifest.
+ *
+ * @param {string} gamesDir
+ * @param {string} id
+ */
+async function loadGame(gamesDir, id) {
+  const dir = path.join(gamesDir, id);
+  if (!fs.existsSync(dir) || !fs.statSync(dir).isDirectory()) {
+    const available = subdirectories(gamesDir);
+    throw new Error(`No such game: ${id}\nAvailable: ${available.join(', ') || '(none)'}`);
+  }
+
+  let manifest = {};
+  const entry = path.join(dir, 'index.js');
+  if (fs.existsSync(entry)) {
+    const mod = await import(pathToFileURL(entry).href);
+    manifest = mod.default ?? mod;
+  }
+
+  return {
+    id,
+    dir,
+    title: manifest.title ?? id,
+    description: manifest.description ?? '',
+    rules: manifest.rules ?? 'game.md',
+    commands: manifest.commands ?? {},
+  };
+}
+
+/**
+ * Resolve campaign + game for a command.
+ */
+async function resolveContext(flags) {
+  const base = resolveCampaign(flags);
+  const gameId = typeof flags.game === 'string' ? flags.game : base.campaign?.game || null;
+  const game = gameId ? await loadGame(base.gamesDir, gameId) : null;
+
+  return {
+    ...base,
+    game,
+    findTable: (name) => findTable({ ...base, game }, name),
+    helpers: {
+      rollDie,
+      rollExpr,
+      oracle: rollOracle,
+      parseTable,
+      rollTable,
+      tableRange,
+      findTable: (name) => findTable({ ...base, game }, name),
+    },
+  };
+}
+
+function tableDirs(ctx) {
+  const dirs = [];
+  if (ctx.campaignDir) {
+    dirs.push({ label: `campaign/${ctx.campaign.name}`, dir: path.join(ctx.campaignDir, 'tables') });
+  }
+  if (ctx.game) {
+    dirs.push({ label: `game/${ctx.game.id}`, dir: path.join(ctx.game.dir, 'tables') });
+  }
+  return dirs;
+}
+
+/**
+ * Find a table by name, searching the campaign's tables before the game's.
+ *
+ * @returns {{ file: string, label: string, entries: Array<object> }}
+ */
+function findTable(ctx, name) {
+  const dirs = tableDirs(ctx);
+
+  if (path.isAbsolute(name) && fs.existsSync(name)) {
+    return { file: name, label: 'file', entries: parseTable(fs.readFileSync(name, 'utf8')) };
+  }
+
+  for (const { label, dir } of dirs) {
+    for (const candidate of [path.join(dir, name), path.join(dir, `${name}.csv`)]) {
+      if (fs.existsSync(candidate) && fs.statSync(candidate).isFile()) {
+        return { file: candidate, label, entries: parseTable(fs.readFileSync(candidate, 'utf8')) };
+      }
+    }
+  }
+
+  const available = [];
+  for (const { label, dir } of dirs) {
+    if (!fs.existsSync(dir)) continue;
+    for (const file of fs.readdirSync(dir).filter((f) => f.endsWith('.csv')).sort()) {
+      available.push(`${label}:${file.replace(/\.csv$/, '')}`);
+    }
+  }
+  throw new Error(`Table not found: ${name}\nAvailable: ${available.join(', ') || '(none)'}`);
+}
+
+function countTables(dir) {
+  if (!fs.existsSync(dir)) return 0;
+  return fs.readdirSync(dir).filter((f) => f.endsWith('.csv')).length;
+}
+
+function relative(root, target) {
+  return path.relative(root, target).split(path.sep).join('/');
+}
+
+async function cmdRoll(positional, flags) {
+  const name = positional[0];
+  if (!name) {
+    throw new Error('Usage: journal roll <table> [--campaign <name>] [--game <id>] [--tag <tag>] [--count <n>]');
+  }
+
+  const ctx = await resolveContext(flags);
+  const { file, label, entries } = ctx.findTable(name);
+  const tag = typeof flags.tag === 'string' ? flags.tag : undefined;
+  const count = flags.count ? Number(flags.count) : 1;
+
+  if (!Number.isInteger(count) || count < 1) throw new Error('--count must be a positive integer');
+
+  const lines = [];
+  for (let i = 0; i < count; i++) {
+    const { roll, entry } = rollTable(entries, { tag });
+    const tags = entry.tags.length ? `  [${entry.tags.join(', ')}]` : '';
+    const rollLabel = roll === null ? 'tagged' : `roll ${roll}`;
+    lines.push(`${path.basename(file)} (${label})  ${rollLabel} → "${entry.text}"${tags}`);
+  }
+
+  console.log(lines.join('\n'));
+}
+
+async function cmdOracle(positional, flags) {
+  const question = typeof flags.question === 'string' ? flags.question : positional.join(' ');
+  const result = rollOracle();
+
+  const out = [];
+  if (question) out.push(`Q: ${question}`);
+  out.push(`d6=${result.roll} → ${result.label}`);
+
+  if (flags.complicate) {
+    const ctx = await resolveContext(flags);
+    const tableName = typeof flags.table === 'string' ? flags.table : 'complication-themes';
+    const { entries } = ctx.findTable(tableName);
+    const { entry } = rollTable(entries);
+    out.push(`complication → "${entry.text}"`);
+  }
+
+  console.log(out.join('\n'));
+}
+
+function cmdDice(positional) {
+  const expr = positional.join(' ');
+  if (!expr) throw new Error('Usage: journal dice <expr>  (e.g. journal dice 2d6+1)');
+
+  const result = rollExpr(expr);
+  const detail = result.parts
+    .map((p) => (p.rolls ? `[${p.rolls.join(', ')}]` : `${p.sign < 0 ? '-' : '+'}${p.constant}`))
+    .join(' ');
+
+  console.log(`${result.expr} = ${result.total}   ${detail}`);
+}
+
+async function cmdTables(positional, flags) {
+  const ctx = await resolveContext(flags);
+  const dirs = tableDirs(ctx);
+
+  if (!dirs.length) throw new Error('No campaign or game to list tables for');
+
+  let any = false;
+  for (const { label, dir } of dirs) {
+    if (!fs.existsSync(dir)) {
+      console.log(`${label}  (no tables directory)`);
+      continue;
+    }
+    for (const file of fs.readdirSync(dir).filter((f) => f.endsWith('.csv')).sort()) {
+      any = true;
+      try {
+        const entries = parseTable(fs.readFileSync(path.join(dir, file), 'utf8'));
+        const { min, max } = tableRange(entries);
+        console.log(`${label}  ${file.replace(/\.csv$/, '')}  ${min}-${max}  (${entries.length} entries)`);
+      } catch (err) {
+        console.log(`${label}  ${file}  ERROR: ${err.message}`);
+      }
+    }
+  }
+
+  if (!any) console.log('(no tables)');
+}
+
+function checkTablesDir(dir, label) {
+  const problems = [];
+  const warnings = [];
+  if (!fs.existsSync(dir)) return { problems, warnings };
+
+  for (const file of fs.readdirSync(dir).filter((f) => f.endsWith('.csv')).sort()) {
+    try {
+      const entries = parseTable(fs.readFileSync(path.join(dir, file), 'utf8'));
+      const sorted = [...entries].sort((a, b) => a.min - b.min);
+      let cursor = sorted[0].min;
+      for (const entry of sorted) {
+        if (entry.min > cursor) {
+          warnings.push(`${label}/${file}: gap between ${cursor - 1} and ${entry.min}`);
+        }
+        if (entry.min < cursor) {
+          problems.push(`${label}/${file}: overlapping range at ${entry.min}`);
+        }
+        cursor = Math.max(cursor, entry.max + 1);
+      }
+    } catch (err) {
+      problems.push(`${label}/${file}: ${err.message}`);
+    }
+  }
+
+  return { problems, warnings };
+}
+
+function checkGamePackage(gameDir, id) {
+  const problems = [];
+  const warnings = [];
+
+  const pkgFile = path.join(gameDir, 'package.json');
+  if (!fs.existsSync(pkgFile)) {
+    problems.push(`${id}: missing package.json`);
+  } else {
+    try {
+      const pkg = JSON.parse(fs.readFileSync(pkgFile, 'utf8'));
+      const expected = `@solo/game-${id}`;
+      if (pkg.name !== expected) {
+        warnings.push(`${id}: package.json name is "${pkg.name}", expected "${expected}"`);
+      }
+      if (pkg.type !== 'module') {
+        warnings.push(`${id}: package.json should set "type": "module"`);
+      }
+    } catch (err) {
+      problems.push(`${id}: package.json is not valid JSON (${err.message})`);
+    }
+  }
+
+  if (!fs.existsSync(path.join(gameDir, 'index.js'))) {
+    warnings.push(`${id}: no index.js manifest`);
+  }
+  if (!fs.existsSync(path.join(gameDir, 'tables'))) {
+    warnings.push(`${id}: no tables/ directory`);
+  }
+  if (!fs.existsSync(path.join(gameDir, 'characters'))) {
+    warnings.push(`${id}: no characters/ directory`);
+  }
+
+  return { problems, warnings };
+}
+
+async function cmdCheck(positional, flags) {
+  const base = resolveCampaign(flags);
+  const problems = [];
+  const warnings = [];
+
+  if (base.campaignDir) {
+    const name = base.campaign.name;
+    for (const dir of REQUIRED_DIRS) {
+      if (!fs.existsSync(path.join(base.campaignDir, dir))) {
+        warnings.push(`${name}: missing directory ${dir}/`);
+      }
+    }
+    const campaignTables = checkTablesDir(path.join(base.campaignDir, 'tables'), name);
+    problems.push(...campaignTables.problems);
+    warnings.push(...campaignTables.warnings);
+
+    if (!base.campaign.game) {
+      warnings.push(`${name}: campaign.md has no 'game' frontmatter`);
+    }
+  }
+
+  const gameId = typeof flags.game === 'string' ? flags.game : base.campaign?.game || null;
+  if (gameId) {
+    try {
+      const game = await loadGame(base.gamesDir, gameId);
+      const gameTables = checkTablesDir(path.join(game.dir, 'tables'), game.id);
+      problems.push(...gameTables.problems);
+      warnings.push(...gameTables.warnings);
+      if (!fs.existsSync(path.join(game.dir, game.rules))) {
+        warnings.push(`${game.id}: rules file '${game.rules}' not found`);
+      }
+      const pkg = checkGamePackage(game.dir, game.id);
+      problems.push(...pkg.problems);
+      warnings.push(...pkg.warnings);
+    } catch (err) {
+      problems.push(err.message.split('\n')[0]);
+    }
+  }
+
+  const label = base.campaign ? base.campaign.name : gameId || 'project';
+  for (const warning of warnings) console.log(`warning: ${warning}`);
+  for (const problem of problems) console.log(`error:   ${problem}`);
+  if (!problems.length && !warnings.length) console.log(`ok: ${label}`);
+  else if (!problems.length) console.log(`ok: ${label} (${warnings.length} warning${warnings.length === 1 ? '' : 's'})`);
+
+  if (problems.length) process.exitCode = 1;
+}
+
+async function cmdNewCampaign(positional, flags) {
+  const name = positional[0];
+  if (!name) throw new Error('Usage: journal new-campaign <name> [--game <id>]');
+  if (!/^[a-z0-9][a-z0-9-]*$/.test(name)) {
+    throw new Error('Campaign name must be lowercase letters, digits, and hyphens');
+  }
+
+  const root = findRoot(HERE);
+  const gamesDir = path.join(root, 'games');
+  const gameId = typeof flags.game === 'string' ? flags.game : 'generic';
+
+  if (!fs.existsSync(path.join(gamesDir, gameId))) {
+    throw new Error(
+      `No such game: ${gameId}\nAvailable: ${subdirectories(gamesDir).join(', ') || '(none)'}`,
+    );
+  }
+
+  const source = path.join(root, 'campaigns', '_template');
+  const dest = path.join(root, 'campaigns', name);
+
+  if (!fs.existsSync(source)) throw new Error('Template campaign not found: campaigns/_template');
+  if (fs.existsSync(dest)) throw new Error(`Campaign already exists: ${name}`);
+
+  fs.cpSync(source, dest, { recursive: true });
+
+  const campaignFile = path.join(dest, 'campaign.md');
+  const filled = fs
+    .readFileSync(campaignFile, 'utf8')
+    .replaceAll('{{name}}', name)
+    .replaceAll('{{game}}', gameId)
+    .replaceAll('{{date}}', new Date().toISOString().slice(0, 10));
+  fs.writeFileSync(campaignFile, filled);
+
+  console.log(`Created campaign: campaigns/${name} (game: ${gameId})`);
+  console.log('Next: fill in campaign.md, then create the PC sheet in characters/.');
+}
+
+async function cmdGames() {
+  const gamesDir = path.join(findRoot(HERE), 'games');
+  const ids = subdirectories(gamesDir);
+  if (!ids.length) {
+    console.log('(no games)');
+    return;
+  }
+
+  for (const id of ids) {
+    try {
+      const game = await loadGame(gamesDir, id);
+      const tables = countTables(path.join(game.dir, 'tables'));
+      const commands = Object.keys(game.commands).length;
+      console.log(
+        `${id.padEnd(16)} ${game.title.padEnd(26)} ${String(tables).padStart(2)} tables  ${commands} commands  rules: ${game.rules}`,
+      );
+    } catch (err) {
+      console.log(`${id.padEnd(16)} ERROR: ${err.message}`);
+    }
+  }
+}
+
+async function cmdGame(positional, flags) {
+  const root = findRoot(HERE);
+  const gamesDir = path.join(root, 'games');
+
+  let id = positional[0];
+  if (!id) {
+    const ctx = await resolveContext(flags);
+    if (!ctx.game) throw new Error('No game resolved; pass a game id or use --campaign <name>');
+    id = ctx.game.id;
+  }
+
+  const game = await loadGame(gamesDir, id);
+  console.log(`${game.id} — ${game.title}`);
+  if (game.description) console.log(`  ${game.description}`);
+  console.log(`  rules:      ${relative(root, path.join(game.dir, game.rules))}`);
+
+  const tablesDir = path.join(game.dir, 'tables');
+  console.log(`  tables:     ${relative(root, tablesDir)} (${countTables(tablesDir)})`);
+  console.log(`  characters: ${relative(root, path.join(game.dir, 'characters'))}`);
+
+  const names = Object.keys(game.commands);
+  if (!names.length) {
+    console.log('  commands:   (none)');
+    return;
+  }
+  console.log('  commands:');
+  for (const name of names) {
+    const entry = game.commands[name];
+    const description = typeof entry === 'function' ? '' : entry.description ?? '';
+    console.log(`    ${name.padEnd(14)} ${description}`);
+  }
+}
+
+/**
+ * @param {string[]} argv
+ */
+export async function main(argv) {
+  const { positional, flags } = parseArgs(argv);
+  const command = positional.shift();
+
+  switch (command) {
+    case 'roll':
+      return cmdRoll(positional, flags);
+    case 'oracle':
+      return cmdOracle(positional, flags);
+    case 'dice':
+      return cmdDice(positional);
+    case 'tables':
+      return cmdTables(positional, flags);
+    case 'check':
+      return cmdCheck(positional, flags);
+    case 'new-campaign':
+      return cmdNewCampaign(positional, flags);
+    case 'games':
+      return cmdGames();
+    case 'game':
+      return cmdGame(positional, flags);
+    case 'help':
+    case undefined:
+      return console.log(HELP);
+  }
+
+  // Anything else may be a command contributed by the campaign's game package.
+  const ctx = await resolveContext(flags);
+  const entry = ctx.game?.commands?.[command];
+  if (entry) {
+    const run = typeof entry === 'function' ? entry : entry.run;
+    if (typeof run !== 'function') throw new Error(`Game command "${command}" is not runnable`);
+    return run({ positional, flags }, ctx);
+  }
+
+  throw new Error(`Unknown command: ${command}\n\n${HELP}`);
+}