agentwright

agentwright

agentwright. A small set of typed, composable primitives for building, validating, and running AI agents — and a zero-daemon runtime that executes them. You describe an agent's intent; the system selects the right primitives, configures them, validates the composition against hard invariants, and gives you a runnable, auditable agent.

No framework lock-in, no training, no always-on services. Pure Python, in-process, runs offline with no API key — real LLM and database backends drop in behind the same interfaces when you want them.

pip install agentwright            # or: uv add agentwright

---

Quickstart — the one path that always works

from agentwright import DomainBrief, compose
from agentwright.runtime import AgentRuntime, ReasoningEngine
import asyncio

# 1. Describe intent (what, not how).
brief = DomainBrief(name="My Agent", goal="Summarize inbound leads daily.",
                    domain="sales", long_lived=True)

# 2. Compose -> a validated AgentDefinition (the OS picks + configures primitives).
definition = compose(brief, owner_id="usr_1", created_by="usr_1")
assert not definition.validation_errors      # non-empty => you described something illegal

# 3. Boot the runtime and provision exactly this agent's stores.
rt = AgentRuntime()                           # zero-daemon, all in-process, no API key
rt.instantiate(definition)

# 4. Run it.
engine = ReasoningEngine(rt)
result = asyncio.run(engine.run(definition, task="Summarize today's leads."))
print(result.output, result.stop_reason, result.cost_usd)
rt.close()

If you do nothing else, do that. Everything below is detail and variation. The full agent-facing contract is AGENTS.md.

---

Mental model: three layers, one direction

   YOU (an app / agent / agent system)
        │  express intent as a DomainBrief
        ▼
   Layer 2 — Domain Orchestration
        DomainBrief ─▶ select ─▶ configure ─▶ validate ─▶ register   ─▶ AgentDefinition
        │
        │  an AgentDefinition references…
        ▼
   Layer 1 — Primitives (the vocabulary)
        9 typed building blocks + a discovery/registry API
        │
        │  …which the runtime provisions + executes
        ▼
   Layer 0 — Runtime Infrastructure
        AgentRuntime (stores, vault, bus, scheduler) + ReasoningEngine (the agentic loop)

Direction of control: the AgentDefinition drives the infrastructure. Layer 0 provisions only the stores a definition's primitives declare — it never assumes. You describe needs in the brief; the layers resolve them.

The boundary object is AgentDefinition. It round-trips losslessly, so you can compose in one place and run in another:

blob = definition.model_dump_json()                      # persist / send anywhere
from agentwright import AgentDefinition
definition = AgentDefinition.model_validate_json(blob)   # load and run elsewhere

---

Two kinds of material: execution code vs. agent guidance

Everything above — the three layers, the primitives, the runtime — is execution code: typed, deterministic machinery that runs an agent. It is the how.

Alongside it, guide/ holds agent guidance: prose an agent reads to design itself before it builds. It is the judgment — open-ended best practice, not code:

The split: agentwright/ is the vocabulary an agent executes through; guide/ is how it decides what to build. The primitives stay fixed and typed; the guidance lets the agent self-organize within them. A consuming agent is expected to pick this guidance up automatically — AGENTS.md makes it part of the contract.

---

The 9 primitives (Layer 1 vocabulary)

Four are always present; the rest are selected only when the brief implies them.

Discover them at runtime — every primitive exposes its JSON config schema:

from agentwright import catalogue, describe_primitive
catalogue()                       # [{name, version, dependencies, config_schema}, …]
describe_primitive("permission")  # one primitive, full schema

---

Custom primitives are first-class

The OS is extensible by design: register your own primitive and it flows through the same pipeline as the built-ins — selected, configured from its own schema, version-pinned, dependency-checked, and persisted. No fork, no per-type glue.

from agentwright import PrimitiveTemplate, register_primitive, DomainBrief, compose
from pydantic import BaseModel

class SentimentConfig(BaseModel):
    threshold: float = 0.5

register_primitive(PrimitiveTemplate(
    name="sentiment", version="1.0.0", config_model=SentimentConfig,
    dependencies=("identity",), runtime_contract=("scores text sentiment",),
))

brief = DomainBrief(name="reviews", goal="triage reviews", domain="support",
                    extra_primitives=["sentiment"],
                    custom_config={"sentiment": {"threshold": 0.8}})
defn = compose(brief, owner_id="u", created_by="u")
defn.primitives.custom["sentiment"]          # SentimentConfig(threshold=0.8)

An unsatisfied dependency is a normal validation error; an unregistered name raises. See orchestration/README.md.

---

Layer 0 — what's real vs. interfaced

Layer 0 is zero-daemon: everything runs in your process.

• Real, fully tested offline: SQLite system DB, File Store, Fernet vault, Event Bus, Scheduler (cron), TinyDB document store, LMDB KV, Shell Runner, the ReasoningEngine, and in-memory implementations of every heavy store.

• Real backends behind protocols (runtime/interfaces.py ↔ runtime/real_backends.py): each heavy service has a real adapter implementing the same protocol as its in-memory default, swappable via AgentRuntime(...). SurrealDB (universal) and Chroma (vector) test for real with no API key. Three LLM gateways — Anthropic, OpenAI, Google Gemini — plus a make_gateway(provider) router. Install only what you need:

  pip install "agentwright[anthropic,chroma,surreal]"   # pick extras
  pip install "agentwright[all]"                        # every backend
  

Bring your own backend by implementing a protocol from runtime/interfaces.py (LLMGateway, VectorStore, GraphStore, Memory, …) and passing it to AgentRuntime. That protocol set is the OS's plugin ABI.

---

Install (development)

Uses uv:

uv sync                 # core, offline
uv sync --extra all     # + every real backend
uv run pytest           # run the suite

---

Tests

uv run pytest

164 tests pass offline; 8 live-backend tests skip unless their keys/installs are present. Coverage spans the registry and dependency resolution, the selector matrix, the configurator mapping, custom-primitive composition, every composition invariant and infra gap, the SQLite instance registry, all Layer-0 runtime services, the Layer-2→Layer-1 consumer journey, cross-layer integration, and agent-archetype scenario tests that build realistic agents and run them end to end (L2→L0) — covering all nine primitives and every pattern (each trigger type, each compute backend, generated_ui, sub-agents, the full memory stack, the permission approval flow, multi-tool reasoning, and concurrent agents).

---

Observability

Orchestration boundaries (orchestrate.select/configure/validate/compose/register) emit OpenTelemetry spans, no-ops until a tracer provider is installed. Call agentwright.telemetry.enable_console_tracing() to print spans while debugging. Layer 0 boundaries (run start/stop, tool calls, cost) are recorded in the system DB and audit ledger.

---

Docs

• AGENTS.md — the full integration contract (audience: agents).
• guide/ — design patterns, task decomposition, and context-engineering guidance an agent reads to design itself (audience: agents).
• agentwright/primitives/README.md — Layer 1.
• agentwright/orchestration/README.md — Layer 2.
• agentwright/runtime/README.md — Layer 0.
• design/ — the layer designs this implements.

Acknowledgments

This project stands on the teaching and generosity of others:

• Andrew Ng, whose Agentic AI course shaped much of the thinking behind these primitives and the compose-validate-run model.
• Andrew Lee and the team at Tasklet, for generously sharing the practices behind building an agent OS — a real source of both inspiration and concrete knowledge for this work.
• Matt Dzaman (Stellic), whose Configurable Workflow Platform project idea helped inspire the configuration-driven, composable approach taken here.

Any mistakes or rough edges here are my own.

License

Apache-2.0.