Agent 全栈：约束的归属决定系统的下限

from dataclasses import dataclass, field
from enum import Enum

class Verdict(Enum): ALLOW=1; ASK=2; DENY=3

@dataclass
class Action:
    name: str; target: str; reversible: bool
    risk: float
    state: str = "REQUESTED"

POLICY = {"production.deploy": Verdict.ASK, "change.create": Verdict.ALLOW}
DENY_TARGETS = ["prod-db", "iam:", "secrets/"]

def harness_gate(a: Action) -> Verdict:
    if any(d in a.target for d in DENY_TARGETS):
        return Verdict.DENY          # deny 优先，风险分再低也拦
    base = POLICY.get(a.name, Verdict.ASK)
    if not a.reversible and a.risk > 0.6:
        return Verdict.DENY          # 不可逆且高风险，策略升级
    return base

def transition(a: Action) -> str:
    v = harness_gate(a)
    if v == Verdict.DENY: return "BLOCKED"
    if v == Verdict.ASK:  return "WAITING_APPROVAL"
    return "AUTHORIZED" if a.state == "VALIDATED" else "VALIDATED"

from dataclasses import dataclass
import time

@dataclass
class MemoryEntry:
    kind: str          # episodic / semantic
    content: str
    evidence_ref: str
    ts: float = field(default_factory=time.time)

class MemoryStore:
    def __init__(self): self.entries = []
    def write_if_durable(self, raw: str, decision: str, evidence: str):
        # 只保留后续可能复用的决策与事实，不存全部原文
        if decision in ("CANCELLED", "APPROVED", "ROLLED_BACK"):
            self.entries.append(MemoryEntry("episodic", raw[:300], evidence))
    def recall(self, kind: str, limit: int = 3):
        return [e for e in self.entries if e.kind == kind][-limit:]

def release_gate(trials: list[dict], budget: float) -> str:
    k = len(trials)
    all_pass = all(t["task_ok"] and t["policy_ok"] for t in trials)
    cost = sum(t["cost"] for t in trials) / k
    if not all_pass:
        return f"BLOCK: pass^{k} 未达标（{sum(t['task_ok'] for t in trials)}/{k}）"
    if cost > budget:
        return f"BLOCK: 单任务均成本 {cost:.3f} 超出预算 {budget}"
    return f"PASS: pass^{k}={k}/{k}, 均成本={cost:.3f}"

print(release_gate([
    {"task_ok": True, "policy_ok": True, "cost": 0.42},
    {"task_ok": True, "policy_ok": True, "cost": 0.51},
], budget=0.50))
# BLOCK: 单任务均成本 0.465 超出预算 0.50