acgs-lite 2.5.1

Public ACGS Lite package for constitutional governance in AI agents. Enforce rules, audit decisions, and prevent self-validation in production.

acgs-lite

Constitutional governance infrastructure for AI agents.

acgs-lite lets you define constitutional rules in YAML or code, validate inputs and outputs deterministically, enforce MACI role separation, and maintain tamper-evident audit trails. Install name: acgs-lite. Import namespace: acgs_lite.

Installation

acgs-lite supports Python 3.10+.

pip install acgs-lite
pip install acgs-lite[anthropic]
pip install acgs-lite[openai]
pip install acgs-lite[langchain]
pip install acgs-lite[mcp]
pip install acgs-lite[gitlab]
pip install acgs-lite[server]
pip install acgs-lite[pdf]
pip install acgs-lite[all]

Quick Start

from acgs_lite import Constitution, GovernedAgent

constitution = Constitution.from_template("general")
agent = GovernedAgent(my_agent, constitution=constitution)
result = agent.run("process this request")

Custom Rules

from acgs_lite import Constitution, GovernedAgent, Rule, Severity

constitution = Constitution.from_rules([
    Rule(
        id="NO-PII",
        text="Do not include personally identifiable information",
        severity=Severity.CRITICAL,
        keywords=["ssn", "social security", "passport"],
    ),
    Rule(
        id="NO-HARM",
        text="Do not provide harmful instructions",
        severity=Severity.HIGH,
        keywords=["malware", "exploit"],
    ),
])

agent = GovernedAgent(my_agent, constitution=constitution)
result = agent.run("summarize the report")

YAML Rules

# rules.yaml
rules:
  - id: NO-PII
    text: Never include personally identifiable information
    severity: CRITICAL
    keywords: [ssn, social security, passport]
  - id: NO-MEDICAL-ADVICE
    text: Do not provide specific medical diagnoses
    severity: HIGH
    keywords: [diagnose, prescription, dosage]

from acgs_lite import Constitution, GovernedAgent

constitution = Constitution.from_yaml("rules.yaml")
agent = GovernedAgent(my_agent, constitution=constitution)

MACI Role Separation

from acgs_lite import Constitution, GovernedAgent, MACIRole

constitution = Constitution.from_template("general")
agent = GovernedAgent(
    my_agent,
    constitution=constitution,
    maci_role=MACIRole.PROPOSER,
    enforce_maci=True,
)

result = agent.run("draft deployment plan", governance_action="propose")

Compliance Assessment

from acgs_lite.compliance import MultiFrameworkAssessor

assessor = MultiFrameworkAssessor()
report = assessor.assess(
    {
        "system_id": "claims-triage",
        "jurisdiction": "european_union",
        "domain": "healthcare",
    }
)

print(report.frameworks_assessed)
print(f"Coverage: {report.acgs_lite_total_coverage:.0%}")

HTTP Middleware

from acgs_lite import Constitution
from acgs_lite.middleware import GovernanceASGIMiddleware

constitution = Constitution.from_template("general")
app.add_middleware(
    GovernanceASGIMiddleware,
    constitution=constitution,
    strict=False,
    validate_responses=True,
)

Async Execution

result = await agent.arun("async task")

Key Features

• Deterministic constitutional validation with YAML rules, regex support, severity levels, merge/diff helpers, and hash verification.
• MACI role separation with explicit proposer, validator, executor, and observer boundaries.
• Compliance helpers spanning EU AI Act, NIST AI RMF, ISO 42001, SOC 2 + AI, HIPAA
  • AI, GDPR Article 22, ECOA/FCRA, NYC LL 144, and OECD AI.
• Tamper-evident audit trails with SHA-256 chain verification and telemetry hooks.
• Optional integrations for Anthropic, OpenAI, LangChain, LiteLLM, Google GenAI, LlamaIndex, AutoGen, MCP, GitLab CI/CD, A2A, CrewAI, and ASGI/FastAPI servers.
• Constrained output and remediation-oriented retry flows for stricter production governance.

CLI

acgs init
acgs assess --jurisdiction EU
acgs report --pdf
acgs lint rules.yaml
acgs test --fixtures tests.yaml
acgs eu-ai-act --domain healthcare
acgs refusal "approve deployment"
acgs observe "action" --prometheus

License

AGPL-3.0-or-later. Commercial licensing is available for proprietary or SaaS embedding; contact [e-mail].

Links

• Homepage
• PyPI
• GitHub
• Issues

Constitutional Hash: 608508a9bd224290