agent-governance-patterns

name	agent-governance-patterns
description	Design and implement governance controls for tool-using and multi-agent AI systems, including policy enforcement, approval gates, audit trails, trust scoring, rate limits, and safe tool execution.
metadata	{"skill-author":"Marie-Lynne Block"}

Agent Governance Patterns

Patterns for adding safety, trust, and deterministic policy enforcement to tool-using and multi-agent AI systems.

Overview

Governance patterns ensure AI agents operate within defined boundaries — controlling which tools they can call, what content they can process, how much they can do, and maintaining accountability through audit trails. Use this skill to design or implement controls; use a compliance-focused skill when the task is to score an existing system against a formal standard.

User Request → Intent Classification → Policy Check → Tool Execution → Audit Log
                     ↓                      ↓               ↓
              Threat Detection         Allow/Deny      Trust Update

Use This Skill When

• Agents with tool access: Any agent that calls external tools (APIs, databases, shell commands)
• Multi-agent systems: Agents delegating to other agents need trust boundaries
• Production deployments: Compliance, audit, and safety requirements
• Sensitive operations: Financial transactions, data access, infrastructure management
• Policy enforcement: Tool allowlists, blocklists, approval gates, rate limits, or content filters are needed
• Operational accountability: Tool calls need structured audit trails, denial reasons, or replayable records

Do Not Use This Skill For

• General security reviews where agent governance is not the focus
• OWASP ASI compliance scoring or gap reporting
• Supply-chain integrity, signing, plugin provenance, or manifest verification
• Broad agent architecture design unless policy enforcement, trust boundaries, or auditability are central

---

Pattern 1: Governance Policy

Define what an agent is allowed to do as a composable, serializable policy object.

from dataclasses import dataclass, field
from enum import Enum
from typing import Optional
import re

class PolicyAction(Enum):
    ALLOW = "allow"
    DENY = "deny"
    REVIEW = "review"  # flag for human review

@dataclass
class GovernancePolicy:
    """Declarative policy controlling agent behavior."""
    name: str
    allowed_tools: list[str] = field(default_factory=list)       # allowlist
    blocked_tools: list[str] = field(default_factory=list)       # blocklist
    blocked_patterns: list[str] = field(default_factory=list)    # content filters
    max_calls_per_request: int = 100                             # rate limit
    require_human_approval: list[str] = field(default_factory=list)  # tools needing approval

    def check_tool(self, tool_name: str) -> PolicyAction:
        """Check if a tool is allowed by this policy."""
        if tool_name in self.blocked_tools:
            return PolicyAction.DENY
        if tool_name in self.require_human_approval:
            return PolicyAction.REVIEW
        if self.allowed_tools and tool_name not in self.allowed_tools:
            return PolicyAction.DENY
        return PolicyAction.ALLOW

    def check_content(self, content: str) -> Optional[str]:
        """Check content against blocked patterns. Returns matched pattern or None."""
        for pattern in self.blocked_patterns:
            if re.search(pattern, content, re.IGNORECASE):
                return pattern
        return None

Policy Composition

Combine multiple policies (e.g., org-wide + team + agent-specific):

def compose_policies(*policies: GovernancePolicy) -> GovernancePolicy:
    """Merge policies with most-restrictive-wins semantics."""
    combined = GovernancePolicy(name="composed")

    for policy in policies:
        combined.blocked_tools.extend(policy.blocked_tools)
        combined.blocked_patterns.extend(policy.blocked_patterns)
        combined.require_human_approval.extend(policy.require_human_approval)
        combined.max_calls_per_request = min(
            combined.max_calls_per_request,
            policy.max_calls_per_request
        )
        if policy.allowed_tools:
            if combined.allowed_tools:
                combined.allowed_tools = [
                    t for t in combined.allowed_tools if t in policy.allowed_tools
                ]
            else:
                combined.allowed_tools = list(policy.allowed_tools)

    return combined


# Usage: layer policies from broad to specific
org_policy = GovernancePolicy(
    name="org-wide",
    blocked_tools=["shell_exec", "delete_database"],
    blocked_patterns=[r"(?i)(api[_-]?key|secret|password)\s*[:=]"],
    max_calls_per_request=50
)
team_policy = GovernancePolicy(
    name="data-team",
    allowed_tools=["query_db", "read_file", "write_report"],
    require_human_approval=["write_report"]
)
agent_policy = compose_policies(org_policy, team_policy)

Policy as YAML

Store policies as configuration, not code:

# governance-policy.yaml
name: production-agent
allowed_tools:
  - search_documents
  - query_database
  - send_email
blocked_tools:
  - shell_exec
  - delete_record
blocked_patterns:
  - "(?i)(api[_-]?key|secret|password)\\s*[:=]"
  - "(?i)(drop|truncate|delete from)\\s+\\w+"
max_calls_per_request: 25
require_human_approval:
  - send_email

import yaml

def load_policy(path: str) -> GovernancePolicy:
    with open(path) as f:
        data = yaml.safe_load(f)
    return GovernancePolicy(**data)

---

Pattern 2: Semantic Intent Classification

Detect dangerous intent in prompts before they reach the agent, using pattern-based signals.

from dataclasses import dataclass

@dataclass
class IntentSignal:
    category: str       # e.g., "data_exfiltration", "privilege_escalation"
    confidence: float   # 0.0 to 1.0
    evidence: str       # what triggered the detection

# Weighted signal patterns for threat detection
THREAT_SIGNALS = [
    # Data exfiltration
    (r"(?i)send\s+(all|every|entire)\s+\w+\s+to\s+", "data_exfiltration", 0.8),
    (r"(?i)export\s+.*\s+to\s+(external|outside|third.?party)", "data_exfiltration", 0.9),
    (r"(?i)curl\s+.*\s+-d\s+", "data_exfiltration", 0.7),

    # Privilege escalation
    (r"(?i)(sudo|as\s+root|admin\s+access)", "privilege_escalation", 0.8),
    (r"(?i)chmod\s+777", "privilege_escalation", 0.9),

    # System modification
    (r"(?i)(rm\s+-rf|del\s+/[sq]|format\s+c:)", "system_destruction", 0.95),
    (r"(?i)(drop\s+database|truncate\s+table)", "system_destruction", 0.9),

    # Prompt injection
    (r"(?i)ignore\s+(previous|above|all)\s+(instructions?|rules?)", "prompt_injection", 0.9),
    (r"(?i)you\s+are\s+now\s+(a|an)\s+", "prompt_injection", 0.7),
]

def classify_intent(content: str) -> list[IntentSignal]:
    """Classify content for threat signals."""
    signals = []
    for pattern, category, weight in THREAT_SIGNALS:
        match = re.search(pattern, content)
        if match:
            signals.append(IntentSignal(
                category=category,
                confidence=weight,
                evidence=match.group()
            ))
    return signals

def is_safe(content: str, threshold: float = 0.7) -> bool:
    """Quick check: is the content safe above the given threshold?"""
    signals = classify_intent(content)
    return not any(s.confidence >= threshold for s in signals)

Key insight: Intent classification happens before tool execution, acting as a pre-flight safety check. This is fundamentally different from output guardrails which only check after generation.

Pattern-based classification is a baseline control, not complete sensitive-data detection. For regulated or high-risk systems, combine it with structured validators, data-loss prevention controls, and human approval for high-impact actions.

---

Pattern 3: Tool-Level Governance Decorator

Wrap individual tool functions with governance checks:

import functools
import time
import contextvars

_call_counters: contextvars.ContextVar[dict[str, int] | None] = contextvars.ContextVar(
    "governance_call_counters",
    default=None,
)

def _request_call_counters() -> dict[str, int]:
    counters = _call_counters.get()
    if counters is None:
        counters = {}
        _call_counters.set(counters)
    return counters

def govern(policy: GovernancePolicy, audit_trail=None):
    """Decorator that enforces governance policy on a tool function."""
    def decorator(func):
        @functools.wraps(func)
        async def wrapper(*args, **kwargs):
            tool_name = func.__name__
            start = time.monotonic()

            def audit(action: str, **details):
                if audit_trail is not None:
                    audit_trail.append({
                        "tool": tool_name,
                        "action": action,
                        "policy": policy.name,
                        "timestamp": time.time(),
                        **details,
                    })

            try:
                # 1. Check tool allowlist/blocklist
                action = policy.check_tool(tool_name)
                if action == PolicyAction.DENY:
                    raise PermissionError(f"Policy '{policy.name}' blocks tool '{tool_name}'")
                if action == PolicyAction.REVIEW:
                    raise PermissionError(f"Tool '{tool_name}' requires human approval")

                # 2. Check rate limit for this request/execution context
                counters = _request_call_counters()
                counters[policy.name] = counters.get(policy.name, 0) + 1
                if counters[policy.name] > policy.max_calls_per_request:
                    raise PermissionError(f"Rate limit exceeded: {policy.max_calls_per_request} calls")

                # 3. Check content in arguments
                for arg in list(args) + list(kwargs.values()):
                    if isinstance(arg, str):
                        matched = policy.check_content(arg)
                        if matched:
                            raise PermissionError(f"Blocked pattern detected: {matched}")
            except PermissionError as error:
                audit("denied", reason=str(error))
                raise
            except Exception as error:
                audit("denied", reason="governance_check_failed", error=str(error))
                raise PermissionError("Governance check failed closed") from error

            # 4. Execute and audit
            try:
                result = await func(*args, **kwargs)
                audit("allowed", duration_ms=(time.monotonic() - start) * 1000)
                return result
            except Exception as e:
                audit("error", error=str(e))
                raise

        return wrapper
    return decorator


# Usage with any agent framework
audit_log = []
policy = GovernancePolicy(
    name="search-agent",
    allowed_tools=["search", "summarize"],
    blocked_patterns=[r"(?i)password"],
    max_calls_per_request=10
)

@govern(policy, audit_trail=audit_log)
async def search(query: str) -> str:
    """Search documents — governed by policy."""
    return f"Results for: {query}"

# Passes: search("latest quarterly report")
# Blocked: search("show me the admin password")

---

Pattern 4: Trust Scoring

Track agent reliability over time with decay-based trust scores:

from dataclasses import dataclass, field
import math
import time

@dataclass
class TrustScore:
    """Trust score with temporal decay."""
    score: float = 0.5          # 0.0 (untrusted) to 1.0 (fully trusted)
    successes: int = 0
    failures: int = 0
    last_updated: float = field(default_factory=time.time)

    def record_success(self, reward: float = 0.05):
        self.successes += 1
        self.score = min(1.0, self.score + reward * (1 - self.score))
        self.last_updated = time.time()

    def record_failure(self, penalty: float = 0.15):
        self.failures += 1
        self.score = max(0.0, self.score - penalty * self.score)
        self.last_updated = time.time()

    def current(self, decay_rate: float = 0.001) -> float:
        """Get score with temporal decay — trust erodes without activity."""
        elapsed = time.time() - self.last_updated
        decay = math.exp(-decay_rate * elapsed)
        return self.score * decay

    @property
    def reliability(self) -> float:
        total = self.successes + self.failures
        return self.successes / total if total > 0 else 0.0


# Usage in multi-agent systems
trust = TrustScore()

# Agent completes tasks successfully
trust.record_success()  # 0.525
trust.record_success()  # 0.549

# Agent makes an error
trust.record_failure()  # 0.467

# Gate sensitive operations on trust
if trust.current() >= 0.7:
    # Allow autonomous operation
    pass
elif trust.current() >= 0.4:
    # Allow with human oversight
    pass
else:
    # Deny or require explicit approval
    pass

Multi-agent trust: In systems where agents delegate to other agents, each agent maintains trust scores for its delegates:

class AgentTrustRegistry:
    def __init__(self):
        self.scores: dict[str, TrustScore] = {}

    def get_trust(self, agent_id: str) -> TrustScore:
        if agent_id not in self.scores:
            self.scores[agent_id] = TrustScore()
        return self.scores[agent_id]

    def most_trusted(self, agents: list[str]) -> str:
        return max(agents, key=lambda a: self.get_trust(a).current())

    def meets_threshold(self, agent_id: str, threshold: float) -> bool:
        return self.get_trust(agent_id).current() >= threshold

---

Pattern 5: Audit Trail

Append-only audit log for all agent actions — critical for compliance and debugging:

from dataclasses import dataclass, field
import json
import time

@dataclass
class AuditEntry:
    timestamp: float
    agent_id: str
    tool_name: str
    action: str           # "allowed", "denied", "error"
    policy_name: str
    details: dict = field(default_factory=dict)

class AuditTrail:
    """Append-only audit trail for agent governance events."""
    def __init__(self):
        self._entries: list[AuditEntry] = []

    def log(self, agent_id: str, tool_name: str, action: str,
            policy_name: str, **details):
        self._entries.append(AuditEntry(
            timestamp=time.time(),
            agent_id=agent_id,
            tool_name=tool_name,
            action=action,
            policy_name=policy_name,
            details=details
        ))

    def denied(self) -> list[AuditEntry]:
        """Get all denied actions — useful for security review."""
        return [e for e in self._entries if e.action == "denied"]

    def by_agent(self, agent_id: str) -> list[AuditEntry]:
        return [e for e in self._entries if e.agent_id == agent_id]

    def export_jsonl(self, path: str):
        """Export as JSON Lines for log aggregation systems."""
        with open(path, "w") as f:
            for entry in self._entries:
                f.write(json.dumps({
                    "timestamp": entry.timestamp,
                    "agent_id": entry.agent_id,
                    "tool": entry.tool_name,
                    "action": entry.action,
                    "policy": entry.policy_name,
                    **entry.details
                }) + "\n")

---

Pattern 6: Framework Integration

These examples show where to attach the governance wrapper in common agent frameworks. Treat them as adaptation sketches and verify the exact decorator signatures, tool registration APIs, and version constraints against the framework version used in your project.

PydanticAI

from pydantic_ai import Agent

policy = GovernancePolicy(
    name="support-bot",
    allowed_tools=["search_docs", "create_ticket"],
    blocked_patterns=[r"(?i)(ssn|social\s+security|credit\s+card)"],
    max_calls_per_request=20
)

agent = Agent("openai:gpt-4o", system_prompt="You are a support assistant.")

@agent.tool
@govern(policy)
async def search_docs(ctx, query: str) -> str:
    """Search knowledge base — governed."""
    return await kb.search(query)

@agent.tool
@govern(policy)
async def create_ticket(ctx, title: str, body: str) -> str:
    """Create support ticket — governed."""
    return await tickets.create(title=title, body=body)

CrewAI

from crewai import Agent, Task, Crew

policy = GovernancePolicy(
    name="research-crew",
    allowed_tools=["search", "analyze"],
    max_calls_per_request=30
)

# Apply governance at the crew level
def governed_crew_run(crew: Crew, policy: GovernancePolicy):
    """Wrap crew execution with governance checks."""
    audit = AuditTrail()
    for agent in crew.agents:
        for tool in agent.tools:
            original = tool.func
            tool.func = govern(policy, audit_trail=audit)(original)
    result = crew.kickoff()
    return result, audit

OpenAI Agents SDK

from agents import Agent, function_tool

policy = GovernancePolicy(
    name="coding-agent",
    allowed_tools=["read_file", "write_file", "run_tests"],
    blocked_tools=["shell_exec"],
    max_calls_per_request=50
)

@function_tool
@govern(policy)
async def read_file(path: str) -> str:
    """Read file contents — governed."""
    from pathlib import Path

    root = Path(".").resolve()
    safe_path = Path(path).resolve()
    if root not in safe_path.parents and safe_path != root:
        raise ValueError("Path traversal blocked by governance")
    with safe_path.open() as f:
        return f.read()

---

Governance Levels

Match governance strictness to risk level:

Level	Controls	Use Case
Open	Audit only, no restrictions	Internal dev/testing
Standard	Tool allowlist + content filters	General production agents
Strict	All controls + human approval for sensitive ops	Financial, healthcare, legal
Locked	Allowlist only, no dynamic tools, full audit	Compliance-critical systems

---

Best Practices

Practice	Rationale
Policy as configuration	Store policies in YAML/JSON, not hardcoded — enables change without deploys
Most-restrictive-wins	When composing policies, deny always overrides allow
Deterministic decisions	Use explicit policy checks for allow/deny/review rather than asking an LLM to decide permissions
Pre-flight intent check	Classify intent before tool execution, not after
Trust decay	Trust scores should decay over time — require ongoing good behaviour
Append-only audit	Never modify or delete audit entries — immutability enables compliance
Audit redaction	Store enough detail to investigate, but redact secrets, credentials, and unnecessary personal data
Structured denials	Return consistent denial reasons so users, operators, and tests can distinguish policy failures
Fail closed	If governance check errors, deny the action rather than allowing it
Human approval for high-impact actions	Require explicit review for irreversible, external, financial, legal, or privileged operations
Separate policy from logic	Governance enforcement should be independent of agent business logic

---

Quick Start Checklist

This skill includes copyable local resources:

• resources/governance-policy.template.yaml — baseline policy configuration
• resources/governance-checklist.md — implementation and review checklist

## Agent Governance Implementation Checklist

### Setup
- [ ] Define governance policy (allowed tools, blocked patterns, rate limits)
- [ ] Choose governance level (open/standard/strict/locked)
- [ ] Set up audit trail storage

### Implementation
- [ ] Add @govern decorator to all tool functions
- [ ] Add intent classification to user input processing
- [ ] Implement trust scoring for multi-agent interactions
- [ ] Wire up audit trail export

### Validation
- [ ] Test that blocked tools are properly denied
- [ ] Test that content filters catch sensitive patterns
- [ ] Test rate limiting behavior
- [ ] Verify audit trail captures all events
- [ ] Test policy composition (most-restrictive-wins)

---

Related Resources

• Agent Governance Toolkit — Full governance framework
• AgentMesh Integrations — Framework-specific packages
• OWASP Top 10 for LLM Applications