MetaCoder is a graph-first AI development tool built for large-scale systems with 10,000+ files. It turns your codebase into a Semantic Knowledge Graph and drives AI development through Harness Engineering — a 10-phase pipeline with machine-verified quality gates. It ships as a free Desktop app for Windows and macOS.

What is Harness Engineering?

Harness Engineering gives AI-driven development a fixed order and machine-verified quality standards. Its spec-kit makes the AI design first, then implement exactly to the design — no more, no less — which prevents hallucinated, out-of-scope features.

Which AI models and APIs does MetaCoder support?

MetaCoder is model-agnostic. It works with Anthropic Claude, DeepSeek, Zhipu GLM and any OpenAI-compatible API. You bring your own API key and keep full control of cost and data residency.

Can MetaCoder handle very large codebases?

Yes. MetaCoder is engineered for enterprise systems with 10,000+ source files, holding the whole system as one queryable knowledge graph so the AI can reason across the entire codebase rather than a few files.

How do I get MetaCoder, and does it set up a database?

Download the free Desktop app for Windows or macOS from metacoder.myaiportal.net. The Desktop edition can provision a TiDB Serverless database and configure your cloud infrastructure automatically.

SEMANTIC DEV INTELLIGENCE

Ship enterprise software
the work of ten engineers,
driven by one.

MetaCoder reads your whole codebase as a Semantic Knowledge Graph...

Download Desktop Explore Harness

Windows · macOS · Linux · Free to start · Bring your own API key

metacoder — console

# MetaCoder Desktop · Harness Engineering

› /modernize --output ./web

Phase 0 · building knowledge graph …

graph 412 entities · 86 routes · 19 services

Phase 4 · multi-agent implementation

✓ gate-implementation typecheck · unit-test

Phase 5 · systest (Chrome MCP)

✓ 28/28 E2E evidence captured

✓ MODERNIZATION_REPORT.md

THE CORE PHILOSOPHY

Harness Engineering

AI writes code fast — but "fast" without order produces drift...

KEY INNOVATION · SPEC-KIT

spec-kit — design first, then build exactly to the design

✕ Without spec-kit

✓ With spec-kit

A state-machine pipeline

Roles that switch automatically

Honest-fail gates

Anti rubber-stamp review

Cross-cutting capture

Full audit trail

The 10-phase pipeline

Each step runs a gate before it can advance.

Requirements

GATE

Design

GATE

Test Spec

GATE

Implementation

GATE

Code Review

GATE

Integration Test

GATE

Performance

GATE

Security

GATE

Deploy Plan

GATE

Confirm

✓ DONE

↩ rollback Same pipeline for humans and AI.

/harness — the command reference

Setup & inspect

/harness init [--template TYPE]

/harness spec [--inputs PATHS] [--advance] <brief>

/harness validate

/harness lint

/harness status

/harness phase init [--feature NAME]

Pipeline control

/harness phase status

/harness phase advance [--reason]

/harness phase rollback [--reason]

/harness gate <gateId>

/harness assume <role>

/harness role

Implement & advanced

/harness implement

/harness context <show|refresh|query>

/harness approve <gateId>

/harness drill [--from --to]

/harness ai-rate [--since N]

/harness ci-init [--target]

AUTOMATION SKILLS

Four super-tools, one engine

Every skill builds on the same Semantic Knowledge Graph...

LEGACY → MODERN WEB

/modernize

REQUIREMENTS → APP

/newproject

AUTO QA · CHROME MCP

/systest

INFRA · SAFETY RAILS

/env

Command deep-dive

/modernize --workspace ./legacy --database <conn> [--output ./web] [--design-style] [--backend-lang] [--frontend-lang] [-v] [--env]

Phase flow

Highlights

$ /newproject --workspace ./app --design-docs ./specs [--database <conn>] [--reference] [--design-style] [-v] [--env]

Phase flow

Highlights

$ /systest run --workspace ./app [--backend-url <url>] [--frontend-url <url>] [--database <conn>] [--env]

Phase flow

Highlights

Subcommands

Highlights

Ship enterprise software
the work of ten engineers,
driven by one.

Engineered for 10,000+ file codebases

Stay on the ideas. Delegate the build.

You focus on

MetaCoder handles

Harness Engineering

spec-kit — design first, then build exactly to the design

A state-machine pipeline

Roles that switch automatically

Honest-fail gates

Anti rubber-stamp review

Cross-cutting capture

Full audit trail

The 10-phase pipeline

/harness — the command reference

Four super-tools, one engine

/modernize

/newproject

/systest

/env

Command deep-dive

Your code becomes intelligence the AI can reason over

TiDB Serverless, built into the Desktop app

One-click TiDB Serverless

Cloud infra by MetaCoder

Zero hand-wiring

Console & Desktop — same engine

Desktop Edition

Works with the APIs you already use

Frequently asked questions

Download MetaCoder

Ship enterprise software the work of ten engineers, driven by one.

Engineered for 10,000+ file codebases

Stay on the ideas. Delegate the build.

You focus on

MetaCoder handles

Harness Engineering

spec-kit — design first, then build exactly to the design

A state-machine pipeline

Roles that switch automatically

Honest-fail gates

Anti rubber-stamp review

Cross-cutting capture

Full audit trail

The 10-phase pipeline

/harness — the command reference

Four super-tools, one engine

/modernize

/newproject

/systest

/env

Command deep-dive

Your code becomes intelligence the AI can reason over

TiDB Serverless, built into the Desktop app

One-click TiDB Serverless

Cloud infra by MetaCoder

Zero hand-wiring

Console & Desktop — same engine

Desktop Edition

Works with the APIs you already use

Frequently asked questions

Download MetaCoder

Ship enterprise software
the work of ten engineers,
driven by one.