A Brief, a Gate and a Log: What an Agent-Era Agency Sells, in Code

dev.to2026-10-19 13:050 views

If agencies sell judgment and a working system instead of hours, the product is a small "pod" setup: a brief an agent can follow, a gate a human must pass, and a log. This post sketches that in Python. It is an illustration, not a customer story, and I have no results to share.

The idea comes from public writing by BCG and Google on agent-native marketing. Both say human marketers move toward direction and oversight, and that work is checked before it goes out.

1. A brief the agent can follow

from dataclasses import dataclass, field @dataclass class Brief: goal: str audience: str must_say: list[str] must_not_say: list[str] owner: str # the accountable human  learning_question: str # what we want to learn from this run

2. A review gate

@dataclass class Draft: text: str brief: Brief flags: list[str] = field(default_factory=list) def check(draft: Draft) -> Draft: for phrase in draft.brief.must_not_say: if phrase.lower() in draft.text.lower(): draft.flags.append(f"banned phrase: {phrase}") for phrase in draft.brief.must_say: if phrase.lower() not in draft.text.lower(): draft.flags.append(f"missing: {phrase}") return draft

3. Human sign-off and a log

import json, time def release(draft: Draft, approved_by: str, path="release_log.jsonl"): if draft.flags: raise ValueError(f"fix flags first: {draft.flags}") entry = {"ts": time.time(), "owner": draft.brief.owner, "approved_by": approved_by, "goal": draft.brief.goal, "learning_question": draft.brief.learning_question} with open(path, "a") as f: f.write(json.dumps(entry) + "\n") return entry

What this shows

The agent writes the draft. The code checks it. A named person approves it. The log says who. The four things an agency can still sell sit in these 40 lines: strategy (the brief), system design (the gate), oversight (the approval) and accountability (the owner field).