ao-kernel 2.3.0

Governed AI orchestration runtime — policy-driven, fail-closed, evidence-trail

ao-kernel

Governed AI orchestration runtime — policy-driven, fail-closed, evidence-trail.

ao-kernel is not a general-purpose agent framework. It is a governed runtime that enforces policies, records evidence, and provides deterministic LLM routing for production Python teams.

Installation

pip install ao-kernel                # Core (only jsonschema dependency)
pip install ao-kernel[llm]           # LLM modules (tenacity + tiktoken)
pip install ao-kernel[mcp]           # MCP server support
pip install ao-kernel[otel]          # OpenTelemetry instrumentation
pip install ao-kernel[llm,mcp,otel]  # Everything

Requires Python 3.11+.

Quick Start

# Create workspace
ao-kernel init

# Check health
ao-kernel doctor

# Library mode (no workspace required)
from ao_kernel.config import load_default
policy = load_default("policies", "policy_autonomy.v1.json")

# LLM routing
from ao_kernel.llm import build_request, normalize_response

request = build_request(
    provider_id="openai",
    model="gpt-4",
    messages=[{"role": "user", "content": "Hello"}],
    base_url="https://api.openai.com/v1/chat/completions",
    api_key="sk-...",
)

# Streaming
from ao_kernel.llm import build_request as build_req

stream_request = build_req(
    provider_id="claude",
    model="claude-sonnet-4-20250514",
    messages=[{"role": "user", "content": "Hello"}],
    base_url="https://api.anthropic.com/v1/messages",
    api_key="sk-ant-...",
    stream=True,
)

CLI Reference

Command	Description
ao-kernel init	Create .ao/ workspace
ao-kernel doctor	Workspace health check (8 checks)
ao-kernel migrate [--dry-run] [--backup]	Version migration
ao-kernel version	Print version
ao-kernel mcp serve	Start MCP server (stdio)

Python API

ao_kernel.config

Function	Description
workspace_root(override=None)	Resolve workspace (returns None in library mode)
load_default(resource_type, filename)	Load bundled JSON default
load_with_override(resource_type, filename, workspace)	Workspace override > bundled default

ao_kernel.llm

Function	Description
resolve_route(intent, ...)	Deterministic LLM routing
build_request(provider_id, model, messages, ...)	Provider-native HTTP request
normalize_response(resp_bytes, provider_id)	Extract text + usage + tool_calls
extract_text(resp_bytes)	Extract text from response
execute_request(url, headers, body_bytes, ...)	HTTP with retry + circuit breaker
stream_request(url, headers, ...)	SSE streaming with OK/PARTIAL/FAIL
get_circuit_breaker(provider_id)	Per-provider circuit breaker
count_tokens(messages, provider_id, model)	Token counting

Supported Providers

Provider	Streaming	Tool Use	Embedding
Claude	Yes	Yes	No
OpenAI	Yes	Yes	Yes
Google Gemini	Yes	No	Yes
DeepSeek	Yes	Yes	No
Qwen	Yes	Yes	No
xAI	Yes	Yes	No

AoKernelClient — Unified SDK

Full governed pipeline: route → capabilities → context → build → execute → normalize → decisions → eval → telemetry.

from ao_kernel import AoKernelClient

with AoKernelClient(workspace_root=".") as client:
    result = client.llm_call(
        messages=[{"role": "user", "content": "Hello"}],
        intent="FAST_TEXT",
    )
    print(result["text"])

MCP Server

ao-kernel runs as an MCP (Model Context Protocol) server, exposing governance tools:

ao-kernel mcp serve                          # stdio transport (default)
ao-kernel mcp serve --transport http --port 8080   # HTTP (needs ao-kernel[mcp-http])

Tools:

• ao_policy_check — Validate action against policy (allow/deny)
• ao_llm_route — Resolve provider/model for intent
• ao_llm_call — Execute governed LLM call (thin executor — see matrix below)
• ao_quality_gate — Check output quality
• ao_workspace_status — Workspace health

Resources:

• ao://policies/{name} — Policy JSON
• ao://schemas/{name} — Schema JSON
• ao://registry/{name} — Registry JSON

SDK vs MCP — Which one should I use?

AoKernelClient (SDK) runs the full governed pipeline. ao_llm_call (MCP) is a thin executor — by design, not a limitation. Pick the surface that matches your trust boundary.

Stage	AoKernelClient.llm_call (SDK)	MCP ao_llm_call
Route resolution (provider/model)	✅	✅
Capability gap check	✅	✅ (inside build)
Context injection (3-lane compile)	✅	❌
Transport + retry + circuit breaker	✅	✅
Normalize (text/usage/tool_calls)	✅	✅
Decision extraction + memory loop	✅	❌
Evidence trail (JSONL)	✅	❌
Eval scorecard (diagnostic)	✅	❌
Quality gates (policy-enforced)	✅ (evaluate_quality)	✅ (ao_quality_gate)
OTEL telemetry	✅	❌

Rule of thumb:

• SDK — your own Python process runs the governed loop. Full context, full audit.
• MCP — an external agent (Claude Desktop, Cursor, your own MCP client) delegates a single LLM call through the governance boundary. Context, memory, and telemetry stay in the caller's process, not in the server.

Mixing is fine: an MCP client can call ao_policy_check and ao_quality_gate for governance decisions, run its own LLM, and call back for ao_workspace_status. The server stays thin on purpose.

Context Management

Governed context loop — decisions extracted, scored, and injected automatically.

from ao_kernel.context import start_session, process_turn, compile_context, end_session

# Start session
ctx = start_session(workspace_root=".", session_id="my-session")

# After each LLM turn — automatic extraction + compaction
ctx = process_turn(llm_output, ctx, workspace_root=".", request_id="req-1")

# Compile context for next LLM call (relevance-scored, budget-aware)
compiled = compile_context(ctx, profile="TASK_EXECUTION", max_tokens=4000)
# compiled.preamble → inject into system prompt

# End session — compact + distill + promote
end_session(ctx, workspace_root=".")

SDK Hooks (multi-agent):

from ao_kernel.context.agent_coordination import record_decision, query_memory

record_decision(ws, key="arch.pattern", value="microservices", confidence=0.9)
items = query_memory(ws, key_pattern="arch.*")

Profiles: STARTUP (minimal), TASK_EXECUTION (full), REVIEW (quality focus)

What Makes ao-kernel Different

	ao-kernel	LangGraph	CrewAI	Pydantic AI
Policy engine	96 policies	No	No	No
Fail-closed	Yes	No	No	No
Evidence trail	Self-hosted JSONL	LangSmith SaaS	No	No
Migration CLI	Yes	No	No	No
Doctor	Yes	No	No	No
MCP server	Yes	No	No	No
Streaming	SSE (6 providers)	Yes	Yes	Yes

Architecture

ao_kernel/              <- Public facade (clean API)
  client.py             <- AoKernelClient — unified SDK
  llm.py                <- LLM routing, building, normalization
  governance.py         <- Policy SSOT (4 policy types, fail-closed)
  mcp_server.py         <- MCP server (5 tools, 3 resources)
  context/              <- Context pipeline (compile, inject, extract, promote)
  _internal/            <- Private implementation (do not import directly)
  defaults/             <- 338 bundled JSON (policies, schemas, registry, extensions)

Development

pip install -e ".[dev,llm,mcp]"          # Dev environment
pytest tests/ -x                          # Run tests
ruff check ao_kernel/ tests/              # Lint
mypy ao_kernel/ --ignore-missing-imports  # Type check

Coverage target: 70% branch coverage (excluding _internal).

License

MIT