agent-governance

SKILL.md

Agent Governance Patterns

Patterns for adding safety, trust, and policy enforcement to AI agent 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.

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

When to Use

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

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 3: Tool-Level Governance Decorator

Wrap individual tool functions with governance checks:

import functools
import time
from collections import defaultdict

_call_counters: dict[str, int] = defaultdict(int)

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__

            # 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
            _call_counters[policy.name] += 1
            if _call_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}")

            # 4. Execute and audit
            start = time.monotonic()
            try:
                result = await func(*args, **kwargs)
                if audit_trail is not None:
                    audit_trail.append({
                        "tool": tool_name,
                        "action": "allowed",
                        "duration_ms": (time.monotonic() - start) * 1000,
                        "timestamp": time.time()
                    })
                return result
            except Exception as e:
                if audit_trail is not None:
                    audit_trail.append({
                        "tool": tool_name,
                        "action": "error",
                        "error": str(e),
                        "timestamp": time.time()
                    })
                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

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."""
    import os
    safe_path = os.path.realpath(path)
    if not safe_path.startswith(os.path.realpath(".")):
        raise ValueError("Path traversal blocked by governance")
    with open(safe_path) 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

Pre-flight intent check
Classify intent before tool execution, not after

Trust decay
Trust scores should decay over time — require ongoing good behavior

Append-only audit
Never modify or delete audit entries — immutability enables compliance

Fail closed
If governance check errors, deny the action rather than allowing it

Separate policy from logic
Governance enforcement should be independent of agent business logic

Quick Start 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