Python stdlib for agents

The modules Joeven Try-it boxes actually use: json, re, math, hashlib, copy, collections.

Joeven browser examples stay on the stdlib. No NumPy, no requests.

Cheat sheet

Module	Agent job
`json`	actions, traces, reports
`re`	ReAct parse, tokenize, redact
`math`	cosine, softmax, sqrt
`hashlib`	approval digests, file hashes
`copy.deepcopy`	snapshot worlds
`collections.Counter`	bag-of-words counts
`itertools`	product of eval grids
`functools.lru_cache`	cache embeddings of chunks
`dataclasses` (optional)	typed traces on disk

Regex fragments

Pattern	Meaning
`[a-z]{3,}`	tokens length ≥ 3
`Thought:\s(.)`	ReAct thought line
`sk-[A-Za-z0-9]{6,}`	fake API keys to redact
`(?m)^#`	markdown headings
`(?<=\.)\s+`	sentence split

hashlib

python

import hashlib, json
def sha(obj):
    blob = json.dumps(obj, sort_keys=True, separators=(class="tok-s">",", class="tok-s">":"))
    return hashlib.sha256(blob.encode()).hexdigest()

Always encode() — sha256 wants bytes.

copy

Call	When
`dict(d)`	shallow, values immutable/strings
`list(xs)`	copy a log tail
`copy.deepcopy(world)`	nested metrics dicts

Watch out:exec / eval are stdlib and still hostile. Use only in the multi-agent classroom oracle with tiny __builtins__.