sutra-sdk 1.0.0

The Cloud Harness. Reference Cognitive State Machine engine for the Hybrid Cognitive Sync Protocol: FastAPI + LangGraph + pgvector.

@moolam/cloud-orchestrator

The cloud engine: reference Cognitive State Machine implementation for the Hybrid Cognitive Sync Protocol. Python (FastAPI + LangGraph + pgvector). Any engine that honors the wire contract may replace this one.

Architecture

Domain-agnostic runtime components, each isolated from HTTP concerns:

Module	Responsibility
agent_runtime.py	Composes router, state store, and memory into one agent turn
task_router.py	Cyclical prerequisite-graph routing (LangGraph state machine)
planner.py	Goal decomposition and cyclic plan revision (Python twin of the planning contract)
memory_graph.py	pgvector-backed long-term subject memory (MCE) with kind-aware decay
sync_service.py	CRDT reconciliation over master state documents
contract_models.py	Pydantic mirrors of the canonical TypeScript wire contract
crdt_merge.py	Join-semilattice merge, byte-identical twin of the TS resolver
main.py	FastAPI transport: /v1/sync, /v1/agent/turn, /v1/agent/turn/stream (SSE), /v1/subjects/{id}/state, /v1/subjects/{id}/sync-audit, /v1/health
auth.py	Pluggable AuthVerifier seam + reference API-key / permissive-dev verifiers

No module knows about any profession. Domain configuration (task graphs, charters, tool packs) lives in domains/ and is loaded as data.

AuthN / AuthZ (pluggable)

Default-deny on /v1/* except /v1/health. Self-hosters inject an AuthVerifier at startup — Sutra does not ship an IdP.

Operator guide: docs/pluggable-auth-deployment.md (API-key setup, JWT sketch, mTLS-at-proxy pattern).

Quick API-key mode:

export SUTRA_AUTH_VERIFIER=api_key
export SUTRA_API_KEYS_JSON='{"sk_demo":{"principalId":"ops-1","subjectScope":"*"}}'
uvicorn sutra_orchestrator.main:app --app-dir src

Public API

The HTTP surface is defined by the wire contract in packages/sync-protocol/src/contract.ts. The Pydantic models here must stay field-for-field identical; CI compares generated JSON Schemas.

Quick start

pip install -e ".[dev]"
uvicorn sutra_orchestrator.main:app --reload --app-dir src
# with persistence:
SUTRA_PG_DSN=postgresql://sutra:sutra@localhost:5432/sutra uvicorn sutra_orchestrator.main:app --app-dir src

Or via the repo root: pnpm infra:up (see infra/docker-compose.yml).

Task graph pack (production)

Boot loads a versioned JSON pack via resolve_production_task_graph (not an inline demo graph):

# Optional override (compose sets this to the bundled pack path):
export TASK_GRAPH_PACK=/path/to/task-graph.v1.json
uvicorn sutra_orchestrator.main:app --app-dir src

When unset, the bundled sutra_orchestrator/packs/teacher-cbse-slice.json is used (same bytes as @moolam/domain-loader / playground). Override with TASK_GRAPH_PACK for alternate packs (e.g. demo-math-sd-slice.json). Postgres row injection is supported by the same resolver (pack_row=…) with threshold fallback when the row omits thresholds.

Operator runbooks:

• Local dev and compose bring-up — pnpm install, Python venv, compose up, smoke_test.py, playground at http://localhost:3000
• Sync audit query (SYNC-06) — SQL + API listing advisories by subject / device / code, remediation table, seeded fixture
• Incident triage basics — X-Request-Id correlation; sync storm vs turn latency metrics; quarantined vs exhausted

Live verification (compose): bash packages/cloud-orchestrator/scripts/verify_operator_surfaces_compose.sh (HEALMETREN-003 + OPERRUNB-004).

All three link metrics (/v1/metrics) and the event catalog.

Dependency-light smoke test (pydantic only):

python smoke_test.py

Versioning

Distribution semver and the wire PROTOCOL_VERSION constant move together at release. See docs/protocol/VERSION-LOCKSTEP.md for the file list, bump procedure, and PyPI/npm alignment rules.

Contributing notes

• Never change contract_models.py without changing contract.ts in the same PR (contract-parity checklist in the PR template).
• The merge in crdt_merge.py must remain commutative, associative, and idempotent; the smoke test asserts this on every run.
• Keep runtime components free of domain vocabulary; see docs/adr/0005-runtime.md.

Examples

examples/cloud-sync/ exercises the same merge algebra from TypeScript; smoke_test.py covers the Python side including the planner.