NeoGraph

A fast C++ graph runtime with a durable programmable agent control plane.
Static Core execution when latency matters. QuickJS Programs, sub-agents, Hooks, runtime context, and verified topology evolution when control matters.

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Quick Start · Architecture · Python · Examples · C++ Reference · Python Reference

What NeoGraph is today

NeoGraph has two deliberately separate execution layers:

Layer	Use it for	Contract
GraphEngine / Core	Fixed or host-selected graphs, low overhead, embedded deployment	Immutable compiled topology; C++ nodes execute through Pregel-style super-steps
ProgramRuntime / QuickJS	Runtime control, child Programs, structured concurrency, topology replacement and migration	Immutable Program generations; durable typed commands; journaled transitions and replay

The model never receives compiler, catalog, credential, migration, or authority-granting access. Generated source follows:

proposal → reserve → compile → semantic validate → admit → publish → migrate or spawn

A rejected proposal cannot publish a ProgramVersion, and its dynamic-compile budget is not restored. See Strict Runtime Interposition and DSL capability evaluation.

Quick Start

C++ Core

git clone https://github.com/fox1245/NeoGraph.git
cd NeoGraph
cmake -S . -B build -DNEOGRAPH_BUILD_EXAMPLES=ON
cmake --build build --parallel
./build/example_core_quickstart

The complete source is examples/62_core_quickstart.cpp. It registers one C++ node, compiles a strict graph, runs it, and reads a typed channel.

Enable the programmable control plane when needed:

cmake -S . -B build-program \
  -DNEOGRAPH_BUILD_PROGRAM=ON \
  -DNEOGRAPH_BUILD_QUICKJS_CONTROL=ON \
  -DNEOGRAPH_BUILD_EXAMPLES=ON
cmake --build build-program --parallel
./build-program/example_program_quickstart

See examples/63_program_quickstart.cpp and the QuickJS authoring boundary.

Two runtime layers

GraphEngine / Core

static and conditional edges, cycles, barriers, Send fan-out and Command routing;
checkpoint/resume, exact-checkpoint resume, fork, state history, HITL and NodeInterrupt;
synchronous and coroutine APIs, streaming, cancellation and token accounting;
graph-wide and per-node retry policies, jitter and bounded reusable node caching;
custom registries, providers, tools, MCP, A2A and ACP integration;
safe-point capture and shape-preserving GraphEngine generation migration.

ProgramRuntime / QuickJS

standard JavaScript computation in bounded QuickJS define() and generator main(input);
sealed commands: callCore, spawn, await, all, parallel, race, quorum, emit, checkpoint, cancelScope, and admitted host capabilities;
immutable Program bundles, versions, catalogs, admission profiles and policy snapshots;
durable command journals, exact replay, child lineage, nonrenewable budgets and process recovery;
checkpoint replacement and restricted live GraphEngine topology migration;
host-owned semantic validation before admission of generated Programs.

The installed JavaScript surface is machine-readable through javascript_authoring_capability_manifest() and checked against the actual QuickJS bindings in CI.

Runtime safety and context

NeoGraph moves important behavior outside model discretion:

immutable RAW message history and ContextEpoch selection;
derived context, required Skills and hard constraints;
conservative transformation receipts that preserve required artifacts exactly;
mandatory lifecycle Hooks over native, stdio, or HTTP execution backends;
provider dispatch and terminal-outcome receipts;
durable runtime developer instructions and admitted topology transitions.

NeoGraph guarantees construction, admission, dispatch, and evidence boundaries. It does not claim an LLM attended to every token.

Python

The Python package uses the same C++ engine and now includes the Program, Hook, strict-context, runtime-policy, and SQLite durability surfaces:

pip install neograph-engine

Five-second demo (no API key)

import neograph_engine as ng

@ng.node("greet")
def greet(state):
    return [ng.ChannelWrite(
        "messages",
        [{"role": "assistant", "content": f"Hello, {state.get('name')}!"}],
    )]

definition = {
    "schema_version": ng.TOPOLOGY_SCHEMA_VERSION,
    "name": "demo",
    "channels": {
        "name": {"reducer": "overwrite"},
        "messages": {"reducer": "append"},
    },
    "nodes": {"greet": {"type": "greet"}},
    "edges": [
        {"from": ng.START_NODE, "to": "greet"},
        {"from": "greet", "to": ng.END_NODE},
    ],
}

engine = ng.GraphEngine.compile(definition, ng.NodeContext())
result = engine.run(ng.RunConfig(thread_id="t1", input={"name": "NeoGraph"}))
print(result.output["channels"]["messages"]["value"])

Python additionally exposes:

RetryPolicy, per-node runtime overrides, RunMetadata, exact resume_from, and reusable cache scope;
ProgramSource, ProgramRegistryBuilder, ProgramCompiler, LocalProgramHost, handles and results;
mandatory HookRuntime callbacks and fail-closed lifecycle delivery;
RuntimeContextRequirements, ContextTransformReceipt, SQLite durable context/dispatch stores, and StrictRuntimeProfile.

See Python binding guide and Python examples.

Build configuration

Core-only users do not pay for Program or QuickJS:

cmake -S . -B build-core \
  -DNEOGRAPH_BUILD_PROGRAM=OFF \
  -DNEOGRAPH_BUILD_LLM=OFF \
  -DNEOGRAPH_BUILD_MCP=OFF

Important options:

Option	Purpose
`NEOGRAPH_BUILD_PROGRAM`	Durable Program values, catalog, runtime, lineage and migration
`NEOGRAPH_BUILD_QUICKJS_CONTROL`	QuickJS Program authoring and generator commands
`NEOGRAPH_BUILD_PYBIND`	`neograph-engine` Python extension
`NEOGRAPH_BUILD_SQLITE`	SQLite checkpoint, context, Hook and provider-receipt stores
`NEOGRAPH_BUILD_POSTGRES`	PostgreSQL checkpoint and Program persistence components
`NEOGRAPH_BUILD_MCP_CLIENT` / `SERVER`	MCP client and server roles
`NEOGRAPH_BUILD_A2A` / `ACP` / `GRPC`	Optional protocol integrations

Use the narrow CMake target matching your deployment: neograph::core, neograph::llm, neograph::program, neograph::mcp, neograph::a2a, or another enabled component.

Verification

The repository runs deterministic C++ and Python suites, Program replay/migration probes, DSL capability fixtures, documentation/i18n checks, sanitizers, and optional live-model evaluations. Benchmark claims belong in benchmarks and the dated performance report, not as timeless API guarantees.

Documentation

License

MIT — see LICENSE. Third-party notices: THIRD_PARTY_LICENSES.md.

Metadata

Release files for neograph-engine 0.12.0

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Source distribution for neograph-engine 0.12.0
File	Size	Uploaded
neograph_engine-0.12.0.tar.gz	17.3 MB	Aug 22, 2026	Details

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Table of built distributions (wheels) for neograph-engine 0.12.0
File	Interpreter	ABI	Platform	Reset
neograph_engine-0.12.0-cp313-cp313-win_amd64.whl 8.8 MB Aug 22, 2026	CPython 3.13	CPython 3.13	Windows x86-64	Details
neograph_engine-0.12.0-cp313-cp313-manylinux_2_34_x86_64.whl 15.4 MB Aug 22, 2026	CPython 3.13	CPython 3.13	Linux glibc 2.34+ x86-64	Details
neograph_engine-0.12.0-cp313-cp313-manylinux_2_34_aarch64.whl 14.2 MB Aug 22, 2026	CPython 3.13	CPython 3.13	Linux glibc 2.34+ ARM64	Details
neograph_engine-0.12.0-cp313-cp313-macosx_14_0_arm64.whl 10.6 MB Aug 22, 2026	CPython 3.13	CPython 3.13	macOS 14.0+ ARM64	Details
neograph_engine-0.12.0-cp312-cp312-win_amd64.whl 8.8 MB Aug 22, 2026	CPython 3.12	CPython 3.12	Windows x86-64	Details
neograph_engine-0.12.0-cp312-cp312-manylinux_2_34_x86_64.whl 15.4 MB Aug 22, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.34+ x86-64	Details
neograph_engine-0.12.0-cp312-cp312-manylinux_2_34_aarch64.whl 14.2 MB Aug 22, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.34+ ARM64	Details
neograph_engine-0.12.0-cp312-cp312-macosx_14_0_arm64.whl 10.6 MB Aug 22, 2026	CPython 3.12	CPython 3.12	macOS 14.0+ ARM64	Details
neograph_engine-0.12.0-cp311-cp311-win_amd64.whl 8.8 MB Aug 22, 2026	CPython 3.11	CPython 3.11	Windows x86-64	Details
neograph_engine-0.12.0-cp311-cp311-manylinux_2_34_x86_64.whl 15.4 MB Aug 22, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.34+ x86-64	Details
neograph_engine-0.12.0-cp311-cp311-manylinux_2_34_aarch64.whl 14.2 MB Aug 22, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.34+ ARM64	Details
neograph_engine-0.12.0-cp311-cp311-macosx_14_0_arm64.whl 10.5 MB Aug 22, 2026	CPython 3.11	CPython 3.11	macOS 14.0+ ARM64	Details
neograph_engine-0.12.0-cp310-cp310-win_amd64.whl 8.8 MB Aug 22, 2026	CPython 3.10	CPython 3.10	Windows x86-64	Details
neograph_engine-0.12.0-cp310-cp310-manylinux_2_34_x86_64.whl 15.4 MB Aug 22, 2026	CPython 3.10	CPython 3.10	Linux glibc 2.34+ x86-64	Details
neograph_engine-0.12.0-cp310-cp310-manylinux_2_34_aarch64.whl 14.2 MB Aug 22, 2026	CPython 3.10	CPython 3.10	Linux glibc 2.34+ ARM64	Details
neograph_engine-0.12.0-cp310-cp310-macosx_14_0_arm64.whl 10.5 MB Aug 22, 2026	CPython 3.10	CPython 3.10	macOS 14.0+ ARM64	Details
neograph_engine-0.12.0-cp39-cp39-win_amd64.whl 8.9 MB Aug 22, 2026	CPython 3.9	CPython 3.9	Windows x86-64	Details
neograph_engine-0.12.0-cp39-cp39-manylinux_2_34_x86_64.whl 15.4 MB Aug 22, 2026	CPython 3.9	CPython 3.9	Linux glibc 2.34+ x86-64	Details
neograph_engine-0.12.0-cp39-cp39-manylinux_2_34_aarch64.whl 14.2 MB Aug 22, 2026	CPython 3.9	CPython 3.9	Linux glibc 2.34+ ARM64	Details
neograph_engine-0.12.0-cp39-cp39-macosx_14_0_arm64.whl 10.5 MB Aug 22, 2026	CPython 3.9	CPython 3.9	macOS 14.0+ ARM64	Details

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Release files / neograph_engine-0.12.0-cp311-cp311-manylinux_2_34_x86_64.whl

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Publishing platform: GitHub Actions
Publishing repository: github.com/fox1245/NeoGraph
Publishing commit: github.com/fox1245/NeoGraph/tree/7168e55a53c67f7e93ffa6792bbfe01a52186d91

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Artifact

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Release files / neograph_engine-0.12.0-cp311-cp311-manylinux_2_34_aarch64.whl

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Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/fox1245/NeoGraph
Publishing commit: github.com/fox1245/NeoGraph/tree/7168e55a53c67f7e93ffa6792bbfe01a52186d91

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Artifact

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Release files / neograph_engine-0.12.0-cp311-cp311-macosx_14_0_arm64.whl

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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/fox1245/NeoGraph
Publishing commit: github.com/fox1245/NeoGraph/tree/7168e55a53c67f7e93ffa6792bbfe01a52186d91

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Artifact

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Release files / neograph_engine-0.12.0-cp310-cp310-win_amd64.whl

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Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/fox1245/NeoGraph
Publishing commit: github.com/fox1245/NeoGraph/tree/7168e55a53c67f7e93ffa6792bbfe01a52186d91

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Artifact

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Release files / neograph_engine-0.12.0-cp310-cp310-manylinux_2_34_x86_64.whl

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Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/fox1245/NeoGraph
Publishing commit: github.com/fox1245/NeoGraph/tree/7168e55a53c67f7e93ffa6792bbfe01a52186d91

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Artifact

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Release files / neograph_engine-0.12.0-cp310-cp310-manylinux_2_34_aarch64.whl

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Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/fox1245/NeoGraph
Publishing commit: github.com/fox1245/NeoGraph/tree/7168e55a53c67f7e93ffa6792bbfe01a52186d91

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Artifact

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Release files / neograph_engine-0.12.0-cp310-cp310-macosx_14_0_arm64.whl

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Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/fox1245/NeoGraph
Publishing commit: github.com/fox1245/NeoGraph/tree/7168e55a53c67f7e93ffa6792bbfe01a52186d91

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Artifact

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Release files / neograph_engine-0.12.0-cp39-cp39-win_amd64.whl

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Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/fox1245/NeoGraph
Publishing commit: github.com/fox1245/NeoGraph/tree/7168e55a53c67f7e93ffa6792bbfe01a52186d91

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Artifact

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Release files / neograph_engine-0.12.0-cp39-cp39-manylinux_2_34_x86_64.whl

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Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/fox1245/NeoGraph
Publishing commit: github.com/fox1245/NeoGraph/tree/7168e55a53c67f7e93ffa6792bbfe01a52186d91

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Artifact

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Release files / neograph_engine-0.12.0-cp39-cp39-manylinux_2_34_aarch64.whl

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Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/fox1245/NeoGraph
Publishing commit: github.com/fox1245/NeoGraph/tree/7168e55a53c67f7e93ffa6792bbfe01a52186d91

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Artifact

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Release files / neograph_engine-0.12.0-cp39-cp39-macosx_14_0_arm64.whl

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Upload date	Aug 22, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/fox1245/NeoGraph
Publishing commit: github.com/fox1245/NeoGraph/tree/7168e55a53c67f7e93ffa6792bbfe01a52186d91

Workflow

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Artifact

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SHA-256 checksum: b2e363a0ae3d56b5139fe69bab7b2084874f6a0a5c0caddeed5fb10574e88606 Verifying attestations