The standard library ships 22 canonical modules. They are not loaded by default - import them when you need them.

| **Module** | **Import** | **Purpose** |
|--------|--------|---------|
| Bytes | `import bytes` | Binary data, encoding/decoding (base64, hex) |
| CLI | `import cli` | Command-line argument parsing |
| Collections | `from collections import ...` | List, dict, and set operations (map, filter, reduce, keys, values, etc.) |
| Crypto | `import crypto` | Hashing, encryption, HMAC, signatures, encoding |
| CSV | `import csv` | RFC 4180 CSV parsing and writing |
| Decimal | `import decimal` | Arbitrary-precision decimal arithmetic |
| Environment | `import env` | Environment variable access |
| Filesystem | `import fs` | File I/O with typed paths and Result returns |
| HTTP | `import http` | HTTP client (GET, POST, PUT, DELETE) and static file server |
| JSON | `import json` | Tree API, streaming, mutable building |
| JSON Schema | `import json_schema` | Schema-based JSON validation |
| Logging | `import log` | Log level, sink, capture |
| Math | `import math` | Trigonometry, logarithms, rounding, constants |
| Money | `import money` | Currency-safe monetary arithmetic |
| Path | `import path` | Pure path manipulation utilities |
| Process | `import process` | Subprocess execution, argv, exit, cwd |
| Random | `import random` | Random integer generation |
| Scanner | `import scanner` | Text scanning and pattern matching |
| Text | `import text` | String utilities (split, join, trim, pad, etc.) |
| Time | `import time` | Instant, Duration, Clock. Typed time API |
| URL | `import url` | URL parsing, building, and query encoding |
| UUID | `import uuid` | UUID v4 generation, parsing, and validation |