MCP Servers

aegis

Policy-based governance for AI agent tool calls. YAML policies, approval gates, risk assessment, and audit logging across LangChain, OpenAI, Anthropic, and MCP.

README

<h1 align="center">Aegis</h1> The simplest way to govern AI agent actions. No infra. No lock-in. Just Python. <code>pip install agent-aegis</code> → YAML policy → governance in 5 minutes. Works with LangChain, CrewAI, OpenAI, Anthropic, MCP, and more.

<a href="https://acacian.github.io/aegis/playground/">Try it Live in Your Browser</a> • <a href="#quick-start">Quick Start</a> • <a href="#how-it-works">How It Works</a> • <a href="https://acacian.github.io/aegis/">Documentation</a> • <a href="#integrations">Integrations</a> • <a href="https://github.com/Acacian/aegis/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22">Contributing</a>

English • <a href="./README.ko.md">한국어</a>

Without Aegis vs. With Aegis

Without Aegis — scattered if/else, no audit trail, breaks when you add new tools:

async def handle_agent_action(tool_name, args):
    if tool_name == "delete_users":
        raise Exception("Blocked")                              # fragile
    if tool_name.startswith("bulk_") and args.get("count", 0) > 100:
        approved = await ask_slack_approval(tool_name, args)     # custom per-tool
        if not approved:
            raise Exception("Denied")
    if tool_name == "deploy" and datetime.now().hour >= 18:
        raise Exception("No deploys after hours")               # hardcoded
    result = await execute(tool_name, args)
    # No audit. No consistency. Repeat for every agent, every framework.
    return result

With Aegis — one YAML file governs everything, with audit trail and approval gates built in:

# policy.yaml
rules:
  - name: block_deletes
    match: { type: "delete*" }
    approval: block

  - name: bulk_approval
    match: { type: "bulk_*" }
    conditions: { param_gt: { count: 100 } }
    approval: approve          # asks human via Slack, CLI, Discord, etc.

  - name: no_after_hours
    match: { type: "deploy*" }
    conditions: { time_after: "18:00" }
    approval: block

from aegis import Policy, Runtime

runtime = Runtime(executor=my_executor, policy=Policy.from_yaml("policy.yaml"))
result = await runtime.run_one(action)  # policy check + approval + audit — done.

One pip install. One YAML file. Works across LangChain, CrewAI, OpenAI, Anthropic, and MCP. Full audit trail, human approval gates, and regulatory compliance — without deploying a single server.

How It Works

Core Concepts

Aegis has 3 key components. You need to understand these to use it:

Concept	What it is	Your responsibility
Policy	YAML rules that define what's allowed, what needs approval, and what's blocked.	Write the rules.
Executor	The adapter that actually does things (calls APIs, clicks buttons, runs queries).	Provide one, or use a built-in adapter.
Runtime	The engine that connects Policy + Executor. Evaluates rules, gates approval, executes, logs.	Create it. Call `run_one()` or `plan()` + `execute()`.

The Pipeline

Every action goes through 5 stages. This happens automatically -- you just call runtime.run_one(action):

1. EVALUATE    Your action is matched against policy rules (glob patterns).
               → PolicyDecision: risk level + approval requirement + matched rule

2. APPROVE     Based on the decision:
               - auto:    proceed immediately (low-risk actions)
               - approve: ask a human via CLI, Slack, Discord, Telegram, webhook, or email
               - block:   reject immediately (dangerous actions)

3. EXECUTE     The Executor carries out the action.
               Built-in: Playwright (browser), httpx (HTTP), LangChain, CrewAI, OpenAI, Anthropic, MCP
               Custom: extend BaseExecutor (10 lines)

4. VERIFY      Optional post-execution check (override executor.verify()).

5. AUDIT       Every decision and result is logged to SQLite automatically.
               Export: JSONL, webhook, or query via CLI/API.

Two Ways to Use

Option A: Python library (most common) -- no server needed.

Import Aegis into your agent code. Everything runs in the same process.

runtime = Runtime(executor=MyExecutor(), policy=Policy.from_yaml("policy.yaml"))
result = await runtime.run_one(Action("read", "crm"))

Option B: REST API server -- for non-Python agents (Go, TypeScript, etc.).

pip install 'agent-aegis[server]'
aegis serve policy.yaml --port 8000

curl -X POST localhost:8000/api/v1/evaluate \
  -d '{"action_type": "delete", "target": "db"}'
# => {"risk_level": "CRITICAL", "approval": "block", "is_allowed": false}

Approval Handlers

When a policy rule requires approval: approve, Aegis asks a human. You choose how:

Handler	How it works	Status
CLI (default)	Terminal Y/N prompt	Stable
Slack	Posts Block Kit message, polls thread replies	Stable
Discord	Sends rich embed, polls callback	Stable
Telegram	Inline keyboard buttons, polls getUpdates	Stable
Webhook	POSTs to any URL, reads response	Stable
Email	Sends approval request via SMTP, polls mailbox	Beta
Auto	Approves everything (for testing / server mode)	Stable
Custom	Extend `ApprovalHandler` with your own logic	Stable

Audit Trail

Every action is automatically logged to a local SQLite database. No setup required.

aegis audit                              # View all entries
aegis audit --risk-level HIGH            # Filter by risk
aegis audit --tail                       # Live monitoring (1s poll)
aegis stats                              # Statistics per rule
aegis audit --format jsonl -o export.jsonl  # Export

Quick Start

pip install agent-aegis

1. Generate a policy

aegis init  # Creates policy.yaml with sensible defaults

# policy.yaml
version: "1"
defaults:
  risk_level: medium
  approval: approve

rules:
  - name: read_safe
    match: { type: "read*" }
    risk_level: low
    approval: auto

  - name: bulk_ops_need_approval
    match: { type: "bulk_*" }
    conditions:
      param_gt: { count: 100 }  # Only when count > 100
    risk_level: high
    approval: approve

  - name: no_deletes
    match: { type: "delete*" }
    risk_level: critical
    approval: block

2. Add to your agent

import asyncio
from aegis import Action, Policy, Runtime
from aegis.adapters.base import BaseExecutor
from aegis.core.result import Result, ResultStatus

class MyExecutor(BaseExecutor):
    async def execute(self, action):
        print(f"  Executing: {action.type} -> {action.target}")
        return Result(action=action, status=ResultStatus.SUCCESS)

async def main():
    async with Runtime(
        executor=MyExecutor(),
        policy=Policy.from_yaml("policy.yaml"),
    ) as runtime:
        plan = runtime.plan([
            Action("read", "crm", description="Fetch contacts"),
            Action("bulk_update", "crm", params={"count": 150}),
            Action("delete", "crm", description="Drop table"),
        ])
        print(plan.summary())
        results = await runtime.execute(plan)

asyncio.run(main())

3. See what happened

aegis audit

  ID  Session       Action        Target   Risk      Decision    Result
  1   a1b2c3d4...   read          crm      LOW       auto        success
  2   a1b2c3d4...   bulk_update   crm      HIGH      approved    success
  3   a1b2c3d4...   delete        crm      CRITICAL  block       blocked

Features

Core — what you get out of the box:


YAML policies	Glob matching, first-match-wins, smart conditions (`time_after`, `param_gt`, `weekdays`, regex, etc.)
4-tier risk model	`low` / `medium` / `high` / `critical` with per-rule overrides
Approval gates	CLI, Slack, Discord, Telegram, email, webhook, or custom
Audit trail	Automatic SQLite logging. Export: JSONL, webhook, or query via CLI/API
7 adapters	LangChain, CrewAI, OpenAI Agents, Anthropic, MCP, Playwright, httpx
REST API + Dashboard	`aegis serve policy.yaml` — web UI with KPIs, audit log, compliance reports

Enterprise — production-grade governance:


Cryptographic audit chain	SHA-256/SHA3-256 hash-linked tamper-evident trail (EU AI Act Art.12, SOC2 CC7.2)
Regulatory mapper	EU AI Act, NIST AI RMF, SOC2, ISO 42001, OWASP Agentic Top 10 — gap analysis + evidence
Behavioral anomaly detection	Per-agent profiling, auto-policy generation from observed behavior
RBAC	12 permissions, 5 hierarchical roles, thread-safe AccessController
Multi-tenant isolation	TenantContext, quota enforcement, data separation
Policy versioning	Git-like commit, diff, rollback, tagging

MCP Supply Chain Security — defense-in-depth for MCP tool calls:


Tool poisoning detection	10 regex patterns against Unicode-normalized text, schema recursion
Rug pull detection	SHA-256 hash pinning, definition change alerts
Argument sanitization	Path traversal, command injection, null byte detection
Trust scoring (L0-L4)	Automated trust levels from scan + pin + audit status
Vulnerability database	8 built-in CVEs for popular MCP servers, version-range matching, auto-block
SBOM generation	CycloneDX-inspired bill of materials with vulnerability overlay
Session replay	Record/replay agent sessions with retroactive security scanning (20 patterns)

Multi-Agent Governance:


Cost circuit breaker	17 model pricing entries, loop detection, hierarchical budgets, thread-safe
Cross-framework cost tracking	LangChain + OpenAI + Anthropic + Google → unified CostTracker
Multi-agent cost attribution	Delegation trees, subtree rollup, formatted attribution reports
A2A communication governance	Capability-gated messaging, PII/credential redaction, rate limiting, audit log
Policy-as-code Git integration	Diff formatting, impact analysis, drift detection, YAML export
OpenTelemetry export	Policy/cost/anomaly/MCP events → OTel spans, in-memory fallback

Developer experience:


`aegis scan`	AST-based detection of ungoverned AI calls in your codebase
`aegis probe`	Adversarial policy testing — glob bypass, missing coverage, escalation
`aegis autopolicy`	Natural language → YAML (`"block deletes, allow reads"`)
`aegis score`	Governance coverage 0-100 with shields.io badge
Policy-as-Code SDK	Fluent `PolicyBuilder` API for programmatic construction
GitHub Action	CI/CD governance gates in your pipeline
9 policy templates	Pre-built for CRM, finance, DevOps, healthcare, and more
Interactive playground	Try in browser — no install needed

Real-World Use Cases

Scenario	Policy	Outcome
Finance	Block bulk transfers > $10K without CFO approval	Agents can process invoices safely; large amounts trigger Slack approval
SaaS Ops	Auto-approve reads; require approval for account mutations	Support agents handle tickets without accidentally deleting accounts
DevOps	Allow deploys Mon-Fri 9-5; block after hours	CI/CD agents can't push to prod at 3am
Data Pipeline	Block DELETE on production tables; auto-approve staging	ETL agents can't drop prod data, even if the LLM hallucinates
Compliance	Log every external API call with full context	Auditors get a complete trail for SOC2 / GDPR evidence

Policy Templates

Pre-built YAML policies for common industries. Copy one, customize it, deploy:

Template	Use Case	Key Rules
`crm-agent.yaml`	Salesforce, HubSpot, CRM	Read=auto, Write=approve, Delete=block
`code-agent.yaml`	Cursor, Copilot, Aider	Read=auto, Shell=high, Deploy=block
`financial-agent.yaml`	Payments, invoicing	View=auto, Payments=approve, Transfers=critical
`browser-agent.yaml`	Playwright, Selenium	Navigate=auto, Click=approve, JS eval=block
`data-pipeline.yaml`	ETL, database ops	SELECT=auto, INSERT=approve, DROP=block
`devops-agent.yaml`	CI/CD, infrastructure	Monitor=auto, Deploy=approve, Destroy=block
`healthcare-agent.yaml`	Healthcare, HIPAA	Search=auto, PHI=approve, Delete=block
`ecommerce-agent.yaml`	Online stores	View=auto, Refund=approve, Delete=block
`support-agent.yaml`	Customer support	Read=auto, Respond=approve, Delete=block

policy = Policy.from_yaml("policies/crm-agent.yaml")

Production Ready

Aspect	Detail
1,950+ tests, 92% coverage	Every adapter, handler, and edge case tested
Type-safe	`mypy --strict` with zero errors, `py.typed` marker
Performance	Policy evaluation < 1ms; auto-approved actions add < 5ms overhead
Fail-safe	Blocked actions never execute; can't be bypassed without policy change
Audit immutability	Results are frozen dataclasses; audit writes happen before returning
No magic	Pure Python, no monkey-patching, no global state

Compliance & Audit

Aegis audit trails provide evidence for regulatory and internal compliance:

Standard	What Aegis provides
SOC2	Immutable audit log of every agent action, decision, and approval
GDPR	Data access documentation -- who/what accessed which system and when
HIPAA	PHI access trail with full action context and approval chain
Internal	Change management evidence, risk assessment per action

Export as JSONL, query via CLI/API, or stream to external SIEM via webhook. For defense-in-depth with container isolation, see the Security Model guide.

Integrations

Works with the agent frameworks you already use:

pip install langchain-aegis               # LangChain (standalone integration)
pip install 'agent-aegis[langchain]'      # LangChain (adapter)
pip install 'agent-aegis[crewai]'         # CrewAI
pip install 'agent-aegis[openai-agents]'  # OpenAI Agents SDK
pip install 'agent-aegis[anthropic]'      # Anthropic Claude
pip install 'agent-aegis[httpx]'          # Webhook approval/audit
pip install 'agent-aegis[playwright]'     # Browser automation
pip install 'agent-aegis[server]'         # REST API server
pip install 'agent-aegis[all]'            # Everything

<details> <summary>LangChain -- govern any LangChain tool with one function call</summary>

Option A: langchain-aegis (recommended) — standalone integration package

pip install langchain-aegis

from langchain_aegis import govern_tools

# Add governance to existing tools — no other code changes
governed = govern_tools(tools, policy="policy.yaml")
agent = create_react_agent(model, governed)

Option B: AgentMiddleware — intercepts every tool call via LangChain's middleware protocol

from aegis.adapters.langchain import AegisMiddleware

middleware = AegisMiddleware(policy=Policy.from_yaml("policy.yaml"))
# Blocked calls return a ToolMessage explaining the policy violation
# Allowed calls proceed normally

Option C: Executor/Tool adapter

from aegis.adapters.langchain import LangChainExecutor, AegisTool

executor = LangChainExecutor(tools=[DuckDuckGoSearchRun()])
runtime = Runtime(executor=executor, policy=Policy.from_yaml("policy.yaml"))

</details>

<details> <summary>OpenAI Agents SDK -- native guardrails + decorator governance</summary>

Option A: Native guardrails (recommended) — uses SDK's @tool_input_guardrail / @tool_output_guardrail

from agents import function_tool
from aegis import Policy
from aegis.adapters.openai_agents import (
    create_aegis_input_guardrail,
    create_aegis_output_guardrail,
)

policy = Policy.from_yaml("policy.yaml")
input_guard = create_aegis_input_guardrail(policy=policy, fail_closed=True)
output_guard = create_aegis_output_guardrail(policy=policy)

@function_tool(
    tool_input_guardrails=[input_guard],
    tool_output_guardrails=[output_guard],
)
def web_search(query: str) -> str:
    """Search the web -- Aegis evaluates before AND after execution."""
    return do_search(query)

Option B: Decorator-based — wraps function with full governance pipeline

from aegis.adapters.openai_agents import governed_tool

@governed_tool(runtime=runtime, action_type="write", action_target="crm")
async def update_contact(name: str, email: str) -> str:
    """Update a CRM contact -- governed by Aegis policy."""
    return await crm.update(name=name, email=email)

</details>

<details> <summary>CrewAI -- global guardrail hook + per-tool governance</summary>

Option A: Global guardrail (recommended) — governs ALL tool calls across all Crews

from aegis.adapters.crewai import enable_aegis_guardrail

# One line — every tool call now goes through Aegis policy
provider = enable_aegis_guardrail(runtime=my_runtime)

Option B: Per-tool wrapper

from aegis.adapters.crewai import AegisCrewAITool

tool = AegisCrewAITool(runtime=runtime, name="governed_search",
    description="Search with governance", action_type="search",
    action_target="web", fn=lambda query: do_search(query))

</details>

<details> <summary>Anthropic Claude -- govern tool_use calls</summary>

from aegis.adapters.anthropic import govern_tool_call

for block in response.content:
    if block.type == "tool_use":
        result = await govern_tool_call(
            runtime=runtime, tool_name=block.name,
            tool_input=block.input, target="my_system")

</details>

<details> <summary>httpx -- governed REST API calls</summary>

from aegis.adapters.httpx_adapter import HttpxExecutor

executor = HttpxExecutor(base_url="https://api.example.com",
    default_headers={"Authorization": "Bearer ..."})
runtime = Runtime(executor=executor, policy=Policy.from_yaml("policy.yaml"))

# Action types map to HTTP methods: get, post, put, patch, delete
plan = runtime.plan([Action("get", "/users"), Action("delete", "/users/1")])

</details>

<details> <summary>MCP (Model Context Protocol) -- govern any MCP tool call</summary>

from aegis.adapters.mcp import govern_mcp_tool_call, AegisMCPToolFilter

# Option 1: Govern individual tool calls
result = await govern_mcp_tool_call(
    runtime=runtime, tool_name="read_file",
    arguments={"path": "/data.csv"}, server_name="filesystem")

# Option 2: Filter-based governance
tool_filter = AegisMCPToolFilter(runtime=runtime)
result = await tool_filter.check(server="filesystem", tool="delete_file")
if result.ok:
    # Proceed with actual MCP call
    pass

</details>

<details> <summary>REST API -- govern from any language</summary>

pip install 'agent-aegis[server]'
aegis serve policy.yaml --port 8000

# Evaluate an action (dry-run)
curl -X POST http://localhost:8000/api/v1/evaluate \
    -H "Content-Type: application/json" \
    -d '{"action_type": "delete", "target": "db"}'
# => {"risk_level": "CRITICAL", "approval": "block", "is_allowed": false}

# Execute through full governance pipeline
curl -X POST http://localhost:8000/api/v1/execute \
    -H "Content-Type: application/json" \
    -d '{"action_type": "read", "target": "crm"}'

# Query audit log
curl http://localhost:8000/api/v1/audit?action_type=delete

# Hot-reload policy
curl -X PUT http://localhost:8000/api/v1/policy \
    -H "Content-Type: application/json" \
    -d '{"yaml": "rules:\n  - name: block_all\n    match: {type: \"*\"}\n    approval: block"}'

</details>

<details> <summary>MCP Server -- one-click governance for Claude, Cursor, VS Code, Windsurf</summary>

pip install 'agent-aegis[mcp]'
aegis-mcp-server --policy policy.yaml

Claude Desktop — add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{ "mcpServers": { "aegis": { "command": "uvx", "args": ["--from", "agent-aegis[mcp]", "aegis-mcp-server"] }}}

Cursor — add to .cursor/mcp.json:

{ "mcpServers": { "aegis": { "command": "uvx", "args": ["--from", "agent-aegis[mcp]", "aegis-mcp-server"] }}}

VS Code Copilot — add to .vscode/mcp.json:

{ "servers": { "aegis": { "command": "uvx", "args": ["--from", "agent-aegis[mcp]", "aegis-mcp-server"] }}}

Windsurf — add to ~/.codeium/windsurf/mcp_config.json:

{ "mcpServers": { "aegis": { "command": "uvx", "args": ["--from", "agent-aegis[mcp]", "aegis-mcp-server"] }}}

</details>

<details> <summary>Custom adapters -- 10 lines to integrate anything</summary>

from aegis.adapters.base import BaseExecutor
from aegis.core.action import Action
from aegis.core.result import Result, ResultStatus

class MyAPIExecutor(BaseExecutor):
    async def execute(self, action: Action) -> Result:
        response = await my_api.call(action.type, action.target, **action.params)
        return Result(action=action, status=ResultStatus.SUCCESS, data=response)

    async def verify(self, action: Action, result: Result) -> bool:
        return result.data.get("status") == "ok"

</details>

Policy Conditions

Go beyond glob matching with smart conditions:

rules:
  # Block writes after business hours
  - name: after_hours_block
    match: { type: "write*" }
    conditions:
      time_after: "18:00"
    risk_level: critical
    approval: block

  # Escalate bulk operations over threshold
  - name: large_bulk_ops
    match: { type: "update*" }
    conditions:
      param_gt: { count: 100 }
    risk_level: high
    approval: approve

  # Only allow deploys on weekdays
  - name: weekday_deploys
    match: { type: "deploy*" }
    conditions:
      weekdays: [1, 2, 3, 4, 5]
    risk_level: medium
    approval: approve

Available: time_after, time_before, weekdays, param_eq, param_gt, param_lt, param_gte, param_lte, param_contains, param_matches (regex).

Semantic Conditions

Go beyond keyword matching with the two-tier semantic conditions engine:

rules:
  - name: block_harmful_content
    match: { type: "generate*" }
    conditions:
      semantic: "contains harmful, violent, or illegal content"
    risk_level: critical
    approval: block

Tier 1 uses fast built-in keyword matching. Tier 2 plugs in any LLM evaluator via the SemanticEvaluator protocol -- bring your own model for nuanced content analysis.

Governance Dashboard

Built-in web dashboard for real-time agent governance monitoring. No separate frontend build needed.

# Quick start
pip install 'agent-aegis[server]'
aegis serve policy.yaml

# Open http://localhost:8000

7 dashboard pages:

Page	What it shows
Overview	KPI cards, action volume chart, risk distribution, compliance grade
Audit Log	Filterable/paginated history of all agent actions and decisions
Policy	Current rules, governance score (0-100), score breakdown
Anomalies	Agent behavior profiles, block rates, anomaly alerts
Compliance	SOC2/GDPR/governance reports with findings and letter grades
Regulatory	EU AI Act, NIST, SOC2, ISO 42001 gap analysis
System	Health status, version, API endpoints

11 REST API endpoints under /api/v1/dashboard/ -- use programmatically or through the UI.

# Programmatic access
from aegis.server.app import create_app

app = create_app(
    policy_path="policy.yaml",
    audit_db_path="audit.db",
    enable_dashboard=True,
    anomaly_detector=detector,  # optional
)

Deep Features

Advanced capabilities for production-grade agent governance.

Behavioral Anomaly Detection

Aegis learns per-agent behavior profiles and automatically detects anomalies -- no manual threshold tuning required.

from aegis.core.anomaly import AnomalyDetector

detector = AnomalyDetector()

# Feed observed actions to build per-agent behavior profiles
detector.observe(agent_id="agent-1", action_type="read", target="crm")
detector.observe(agent_id="agent-1", action_type="read", target="crm")
detector.observe(agent_id="agent-1", action_type="read", target="crm")

# Detect anomalies: rate spikes, bursts, new actions, unusual targets, high block rates
alerts = detector.check(agent_id="agent-1", action_type="delete", target="prod_db")
# => [Anomaly(type=NEW_ACTION, detail="action 'delete' never seen for agent-1")]

# Auto-generate a policy from observed behavior
learned_policy = detector.generate_policy(agent_id="agent-1")

Detects: rate spikes | burst patterns | never-seen actions | unusual targets | high block rates

Compliance Report Generator

Generate audit-ready compliance reports from your existing audit logs. No additional tooling needed.

aegis compliance --type soc2 --output report.json
aegis compliance --type gdpr --output gdpr-report.json
aegis compliance --type governance --days 30

from aegis.core.compliance import ComplianceReporter

reporter = ComplianceReporter(audit_store=runtime.audit_store)
report = await reporter.generate(report_type="soc2", days=90)

print(report.score)        # 87.5
print(report.findings)     # List of findings with severity
print(report.evidence)     # Linked audit log entries

Supported report types: SOC2 | GDPR | Governance -- each with scoring, findings, and evidence links.

Policy Diff & Impact Analysis

Compare two policy files and understand exactly what changed and what impact it will have.

# Show added/removed/modified rules between two policies
aegis diff policy-v1.yaml policy-v2.yaml

# Replay historical actions against the new policy to see impact
aegis diff policy-v1.yaml policy-v2.yaml --replay audit.db

 Rules: 2 added, 1 removed, 3 modified

 + bulk_write_block     CRITICAL/block   (new)
 + pii_access_approve   HIGH/approve     (new)
 - legacy_allow_all     LOW/auto         (removed)
 ~ read_safe            LOW/auto → LOW/auto  conditions changed
 ~ deploy_prod          HIGH/approve → CRITICAL/block  risk escalated
 ~ bulk_ops             MEDIUM/approve   param_gt.count: 100 → 50

 Impact (replayed 1,247 actions):
   23 actions would change from AUTO → BLOCK
    7 actions would change from APPROVE → BLOCK

Agent Trust Chain

Hierarchical agent identity with delegation and capability-scoped trust.

from aegis.core.trust import TrustChain, AgentIdentity, Capability

# Create a root agent with full capabilities
root = AgentIdentity(
    agent_id="orchestrator",
    capabilities=[Capability("*")],  # glob matching
)

# Delegate a subset of capabilities (intersection semantics)
worker = root.delegate(
    agent_id="data-worker",
    capabilities=[Capability("read:*"), Capability("write:staging_*")],
)

# Worker can only do what both root AND delegation allow
chain = TrustChain()
chain.register(root)
chain.register(worker, parent=root)

# Verify capability at runtime
chain.can(worker, "read:crm")           # True
chain.can(worker, "delete:prod_db")     # False -- not in delegation

# Cascade revocation: revoking parent revokes all children
chain.revoke(root)
chain.can(worker, "read:crm")           # False

Rate Limiter

Per-agent and global sliding-window rate limiting with glob-pattern matching on agent IDs.

from aegis.core.rate_limiter import RateLimiter

limiter = RateLimiter()
limiter.add_rule("agent-*", max_requests=100, window_seconds=60)
limiter.add_rule("agent-untrusted", max_requests=10, window_seconds=60)

limiter.check("agent-untrusted", action_type="write")  # True (allowed)
# After 10 calls in 60s:
limiter.check("agent-untrusted", action_type="write")  # False (rate limited)

RBAC (Role-Based Access Control)

12 granular permissions across 5 hierarchical roles. Thread-safe AccessController for multi-agent environments.

from aegis.core.rbac import AccessController, Role

ac = AccessController()
ac.assign_role("alice", Role.ADMIN)
ac.assign_role("bot-1", Role.OPERATOR)

ac.check("alice", "policy:write")   # True
ac.check("bot-1", "policy:write")   # False -- operators can execute, not configure
ac.check("bot-1", "action:execute") # True

Roles: viewer < operator < admin < policy_admin < super_admin

Policy Versioning

Git-like policy version control with commit, diff, rollback, and tagging.

from aegis.core.versioning import PolicyVersionStore

store = PolicyVersionStore("./policy-versions.json")
store.commit(policy, message="Initial production policy")
store.tag("v1.0")

# Later...
store.commit(updated_policy, message="Relax read rules")
diff = store.diff("v1.0", "HEAD")   # See what changed
store.rollback("v1.0")               # Revert to tagged version

Multi-Tenant Isolation

Context-based tenant isolation with quota enforcement and data separation.

from aegis.core.tenant import TenantContext, TenantRegistry, TenantIsolation

registry = TenantRegistry()
registry.register("acme-corp", quota={"max_actions_per_hour": 1000})

with TenantContext("acme-corp"):
    # All policy evaluations, audit writes, and rate limits
    # are automatically scoped to this tenant
    result = await runtime.run_one(action)

Cryptographic Audit Chain

Tamper-evident audit trail with hash-linked entries. Meets EU AI Act Article 12 and SOC2 CC7.2 requirements.

aegis audit --verify              # Verify chain integrity
aegis audit --export-chain        # Export full hash chain
aegis audit --evidence soc2       # Generate compliance evidence package

from aegis.core.crypto_audit import CryptoAuditLogger

logger = CryptoAuditLogger(algorithm="sha3-256")
# Each entry is hash-linked to the previous -- any tampering breaks the chain
logger.log(action, decision, result)
assert logger.verify_chain()  # True if untampered

Regulatory Compliance Mapper

Maps your governance posture against EU AI Act, NIST AI RMF, SOC2, and ISO 42001. Identifies gaps and generates evidence.

aegis regulatory --framework eu-ai-act    # Gap analysis
aegis regulatory --framework nist-ai-rmf  # NIST mapping
aegis regulatory --all --output report.json

29 regulatory requirements mapped across 4 frameworks with automatic evidence collection from audit logs.

Natural Language Policy Generation

Generate YAML policies from plain English. Two tiers: built-in keyword parser (no dependencies) and pluggable LLM evaluator (bring your own API key).

aegis autopolicy "block all deletes on production, allow reads, require approval for writes over $10K"

# Generated output:
version: '1'
defaults:
  risk_level: medium
  approval: approve
rules:
- name: delete_block
  match: { type: "delete*", target: "prod*" }
  risk_level: critical
  approval: block
- name: read_auto
  match: { type: "read*" }
  risk_level: low
  approval: auto

Tier 2 (LLM-backed): implement the PolicyGenerator protocol with your preferred provider (OpenAI, Anthropic, etc.) -- same pattern as SemanticEvaluator.

Adversarial Policy Probe

Automated testing for governance gaps. Probes for glob bypasses, missing coverage, escalation patterns, and overly permissive defaults.

aegis probe policy.yaml

# Aegis Policy Probe — 205 probes
# ==================================================
#   Robustness score: 72/100
#   Findings: 8
#
#   CRITICAL [missing_coverage]
#     Destructive action 'drop' on 'production' is auto-approved
#     -> Add a rule to block or require approval for 'drop' actions
#
#   HIGH [glob_bypass]
#     'bulk_delete' bypasses block rule 'no_deletes' (pattern: 'delete')
#     -> Broaden the glob pattern to 'delete*' or add a rule for 'bulk_delete'

`aegis scan` -- Static Analysis

AST-based scanner that detects ungoverned AI tool calls in your Python codebase.

aegis scan ./src/

# Output:
# src/agents/mailer.py:42  openai.ChatCompletion.create()  -- ungoverned
# src/agents/writer.py:18  anthropic.messages.create()     -- ungoverned
# src/tools/search.py:7    langchain tool "web_search"     -- ungoverned
#
# 3 ungoverned calls found. Run `aegis score` for governance coverage.

`aegis score` -- Governance Score

Quantify your governance coverage with a 0-100 score and generate a shields.io badge.

aegis score ./src/ --policy policy.yaml

# Governance Score: 84/100
#   Governed calls:   21/25 (84%)
#   Policy coverage:  18 rules covering 6 action types
#   Anomaly detection: enabled
#   Audit trail:       enabled
#
# Badge: https://img.shields.io/badge/aegis_score-84-brightgreen

Add the badge to your repo:

![Aegis Score](https://img.shields.io/badge/aegis_score-84-brightgreen)

Architecture

aegis/
  core/              Action, Policy engine, Conditions, Risk levels, Retry, JSON Schema
  core/anomaly       Behavioral anomaly detection -- per-agent profiling, auto-policy generation
  core/compliance    Compliance report generator -- SOC2, GDPR, governance scoring
  core/trust         Agent trust chain -- hierarchical identity, delegation, revocation
  core/semantic      Semantic conditions engine -- keyword matching + LLM evaluator protocol
  core/diff          Policy diff & impact analysis -- rule comparison, action replay
  core/rate_limiter  Per-agent/global sliding-window rate limiting
  core/rbac          Role-based access control -- 12 permissions, 5 roles, AccessController
  core/versioning    Policy version control -- commit, diff, rollback, tagging
  core/tenant        Multi-tenant isolation -- context, registry, quota enforcement
  core/crypto_audit  Cryptographic audit chain -- hash-linked tamper-evident logs
  core/replay        Action replay engine -- what-if policy analysis
  core/regulatory    EU AI Act / NIST / SOC2 / ISO 42001 compliance mapper
  core/webhooks      Webhook notifications -- Slack, PagerDuty, JSON
  core/builder       Policy-as-Code SDK -- fluent PolicyBuilder API
  core/autopolicy    Natural language -> YAML policy generation (keyword + LLM)
  core/probe         Adversarial policy testing -- gap detection, bypass attempts
  core/tiers         Enterprise tier system -- feature gating with soft nudge
  core/mcp_security  MCP supply chain security -- poisoning, rug pull, sanitization, trust scoring
  core/mcp_vuln_db   MCP vulnerability database -- CVE matching, version ranges, auto-block
  core/mcp_sbom      MCP server SBOM generation -- tool catalog, vulnerability overlay, JSON export
  core/budget        Cost circuit breaker -- 17 model pricing, loop detection, hierarchical budgets
  core/cost_callbacks  Cross-framework cost tracking -- LangChain, OpenAI, Anthropic, Google
  core/cost_attribution  Multi-agent cost attribution -- delegation trees, subtree rollup
  core/a2a_governance  Agent-to-agent communication governance -- capability gates, content filter
  core/policy_git    Policy-as-code Git integration -- diff, impact analysis, drift detection
  core/otel_export   OpenTelemetry export -- governance events → OTel spans
  core/session_replay  Session replay -- record/replay with retroactive security scanning
  adapters/          BaseExecutor, Playwright, httpx, LangChain, CrewAI, OpenAI, Anthropic, MCP
  runtime/           Runtime engine, ApprovalHandler, AuditLogger (SQLite/JSONL/webhook/logging)
  server/            REST API (Starlette ASGI) -- evaluate, execute, audit, policy endpoints
  cli/               aegis validate | audit | schema | init | simulate | serve | stats |
                     scan | score | diff | compliance | regulatory | monitor

Why Aegis?

	Writing your own	Platform guardrails	Enterprise platforms	Aegis
Setup	Days of if/else	Vendor-specific config	Kubernetes + procurement	`pip install` + YAML
Cross-framework	Rewrite per framework	Their ecosystem only	Usually single-vendor	LangChain + CrewAI + OpenAI + Anthropic + MCP
Audit trail	printf debugging	Platform logs only	Cloud dashboard	SQLite + JSONL + webhooks — local, no infra
Compliance	Manual documentation	None	Enterprise sales cycle	EU AI Act, NIST, SOC2, ISO 42001 built-in
Cost	Engineering time	Free-to-$$$ per vendor	$$$$ + infra	Free (MIT). Forever.

CLI

aegis init                              # Generate starter policy
aegis validate policy.yaml              # Validate policy syntax
aegis schema                            # Print JSON Schema (for editor autocomplete)
aegis simulate policy.yaml read:crm delete:db  # Test policies without executing
aegis audit                             # View audit log
aegis audit --session abc --format json # Filter + format
aegis audit --tail                      # Live monitoring
aegis audit --format jsonl -o export.jsonl  # Export
aegis stats                             # Policy rule statistics
aegis serve policy.yaml --port 8000     # Start REST API + dashboard (http://localhost:8000)
aegis scan ./src/                       # Detect ungoverned AI tool calls (AST-based)
aegis score ./src/ --policy policy.yaml # Governance score (0-100) + badge
aegis diff policy-v1.yaml policy-v2.yaml           # Compare policies
aegis diff policy-v1.yaml policy-v2.yaml --replay  # Impact analysis with action replay
aegis compliance --type soc2 --output report.json  # Generate compliance report
aegis autopolicy "block deletes, allow reads"      # Generate policy from English
aegis probe policy.yaml                            # Adversarial policy testing

Roadmap

Version	Status	Features
0.1	Released	Policy engine, 7 adapters (incl. MCP), CLI, audit (SQLite + JSONL + webhook), conditions, JSON Schema
0.1.3	Released	REST API server, retry/rollback, dry-run, hot-reload, policy merge, Slack/Discord/Telegram/email approval, simulate CLI, runtime hooks, stats, live tail
0.1.4	Released	Multi-agent foundations (agent_id, PolicyHierarchy, conflict detection), performance optimizations (compiled globs, batch audit, eval cache), security hardening, MCP/LangChain/CrewAI/OpenAI cookbooks
0.1.5	Released	Behavioral anomaly detection, compliance report generator (SOC2/GDPR), policy diff & impact analysis, semantic conditions engine, agent trust chain, `aegis scan` (static analysis), `aegis score` (governance scoring + badge)
0.1.7	Released	Cryptographic audit chain, rate limiter, RBAC, policy versioning, multi-tenant isolation, regulatory mapper (EU AI Act/NIST/SOC2/ISO 42001), webhook notifications, action replay, PolicyBuilder SDK, policy testing framework, real-time monitor, GitHub Action
0.1.9	Released	Web governance dashboard (7 pages, 11 API endpoints), `aegis serve` with dashboard, natural language autopolicy, adversarial probe
0.2	Released	LangChain AgentMiddleware, CrewAI GuardrailProvider, OpenAI Agents native guardrails, OWASP Agentic Top 10, HTML compliance reports, interactive playground + challenge
0.3	Released	MCP supply chain security (poisoning/rug pull/SBOM/vuln DB), cost circuit breaker (17 models), cross-framework cost tracking (LangChain/OpenAI/Anthropic/Google), A2A communication governance, session replay with retroactive scanning, OpenTelemetry export, policy Git integration
0.4	Q3 2026	Centralized policy server, cross-agent audit correlation
1.0	2027	Distributed governance, hosted SaaS, SSO/SCIM

Contributing

We welcome contributions! Check out:

Good First Issues -- great starting points
Contributing Guide -- setup, code style, PR process
Architecture -- how the codebase is structured

git clone https://github.com/Acacian/aegis.git && cd aegis
make dev      # Install deps + hooks
make test     # Run tests
make lint     # Lint + format check
make coverage # Coverage report

Or jump straight into a cloud environment:

Badge

Using Aegis? Add a badge to your project:

[![Governed by Aegis](https://img.shields.io/badge/governed%20by-aegis-blue?logo=data:image/svg%2bxml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxMDAgMTAwIj48dGV4dCB5PSIuOWVtIiBmb250LXNpemU9IjkwIj7wn5uh77iPPC90ZXh0Pjwvc3ZnPg==)](https://github.com/Acacian/aegis)

License

MIT -- see LICENSE for details.

Built for the era of autonomous AI agents. If Aegis helps you, consider giving it a star -- it helps others find it too.

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aegis

README

Without Aegis vs. With Aegis

How It Works

Core Concepts

The Pipeline

Two Ways to Use

Approval Handlers

Audit Trail

Quick Start

1. Generate a policy

2. Add to your agent

3. See what happened

Features

Real-World Use Cases

Policy Templates

Production Ready

Compliance & Audit

Integrations

Policy Conditions

Semantic Conditions

Governance Dashboard

Deep Features

Behavioral Anomaly Detection

Compliance Report Generator

Policy Diff & Impact Analysis

Agent Trust Chain

Rate Limiter

RBAC (Role-Based Access Control)

Policy Versioning

Multi-Tenant Isolation

Cryptographic Audit Chain

Regulatory Compliance Mapper

Natural Language Policy Generation

Adversarial Policy Probe

aegis scan -- Static Analysis

aegis score -- Governance Score

Architecture

Why Aegis?

CLI

Roadmap

Contributing

Badge

License

Recommended Servers

`aegis scan` -- Static Analysis

`aegis score` -- Governance Score