Harness Engineering — Technology Landscape

SDD — Spec-Driven Development
OpenSpec
Fission-AI/OpenSpec
Spec-driven development for AI coding assistants
★ 63.6k
spec-kit
github/spec-kit
Toolkit to get started with Spec-Driven Development
★ 125.1k
BMAD
bmad-code-org/bmad-method
Breakthrough Method for Agile AI Driven Development
★ 51.4k
Coding Assistants — Coding assistants usable from a terminal
General Purpose
pi.dev
earendil-works/pi
Minimal agent harness — adapt to your workflow, not vice versa
★ 82.8k
OpenCode
anomalyco/opencode
OpenCode is an open source agent that helps you write code in your terminal, IDE, or desktop.
★ 192.7k
NanoCoder
Nano-Collective/nanocoder
An open coding agent for your terminal, built by a community collective rather than a company. Bring your own model, keep your code on your machine, and owe nothing to anyone.
★ 2.3k
Qwen Code
qwenLM/qwen-code
An open-source AI agent for the terminal, optimized for Qwen series models
★ 26.6k
Local-First
Codehamr
codehamr/codehamr
A minimal, local-first coding agent.
★ 206
Atomic Agent
AtomicBot-ai/atomic-agent
A local-first AI agent that runs on your machine, with local or cloud models.
★ 1.2k
Orchestration
Symphony
openai/symphony
Isolated autonomous implementation runs for teams
★ 26.4k
Conductor
microsoft/conductor
Multi-agent workflows with GitHub Copilot SDK
★ 361
OpenSquilla
opensquilla/opensquilla
Token-efficient AI agent with higher intelligence density
★ 6.5k
Fabro
fabro-sh/fabro
Version-controlled workflow graphs orchestrating AI agents, commands, and human gates
★ 1.5k
smolagents
huggingface/smolagents
Barebones library for agents that think in code
★ 28.6k
OpenHive
aden-hive/hive
Multi-agent harness for production AI workloads
★ 10.8k
bernstein
sipyourdrink-ltd/bernstein
Audit-grade multi-agent orchestration, HMAC-chained audit log
★ 772
AST and Code Parsers
CocoIndex Code
cocoindex-io/cocoindex
AST-based lightweight code search engine CLI; saves 70% tokens
★ 11.2k
CodeGraphContext
CodeGraphContext/CodeGraphContext
MCP server indexing local code into a graph database
★ 4.0k
ast-grep
ast-grep/ast-grep
CLI tool for code structural search, lint and rewriting in Rust
★ 15.4k
Graphify
Graphify-Labs/graphify
Turn code and docs into queryable AI knowledge graphs
★ 101.5k
Sandboxes
NVIDIA OpenShell
docs.nvidia.com
Sandboxed agent runtime with hardware-enforced isolation and policy
forkd
deeplethe/forkd
fork() for AI agent microVMs; spawn 100 children in ~100ms
★ 2.7k
OpenSandbox
opensandbox-group/OpenSandbox
Secure, fast, extensible sandbox runtime for AI agents
★ 12.3k
Daytona
daytonaio/daytona
Elastic infrastructure for running AI-generated code; sub-90ms creation
★ 72.1k
Working with Skills
Skill Reference
Agent Skills
agentskills.io
Standardized open format for extending AI agent capabilities via SKILL.md files
Skill Syntax Validation
skill-validator
agent-ecosystem/skill-validator
Validates skill content against the Agent Skill specification
★ 212
Skill Dependency Management
skills (Vercel Labs)
vercel-labs/skills
Open agent skills CLI; supports OpenCode, Claude Code, Codex, Cursor and 68+ more
★ 27.9k
Skill Security Scanners
DefenseClaw
cisco-ai-defense/defenseclaw
Security governance for agentic AI; scan capabilities, inspect traffic, audit evidence
★ 794
SkillSpector
nvidia/skillspector
Security scanner for AI agent skills; detects vulnerabilities before installation
★ 14.1k
Knowledge Base
LLM Wikis
OpenKnowledge
inkeep/open-knowledge
Beautiful, AI-native markdown IDE and LLM wiki
★ 3.3k
Open Knowledge Format (OKF)
OKF Ecosystem
okf.md
Open Knowledge Format ecosystem; tools, spec and docs for AI agent knowledge bases
okflint
mattdav/okflint
Deterministic compliance linter for OKF bundles; profile-based rule enforcement
★ 4
okf CLI
superops-team/okf
CLI for git-based OKF knowledge bases; keeps bundles fresh via git hooks
★ 19
Technology Specifics
Context7
upstash/context7
Up-to-date documentation for LLMs and AI code editors
★ 60.2k
LangChain docs MCP + skills
docs.langchain.com
Use LangChain Docs Programmatically with MCP and installed skills
NVIDIA Agent Skills
nvidia/skills
Official NVIDIA-verified skills catalog for CUDA-X, AI Blueprints and platform tools
★ 2.8k
Token Control
rtk
rtk-ai/rtk
CLI proxy reduces LLM token consumption by 60-90% on common dev commands; single Rust binary
★ 74.5k
ponytail
dietrichgebert/ponytail
Makes your AI agent think like the laziest senior dev in the room. The best code is the code you never wrote.
★ 94.5k
Headroom Desktop
gglucass/headroom-desktop
MacOS menu bar app cuts Claude Code and Codex token costs by ~50%
★ 489
Observability
Langfuse
langfuse/langfuse
Open source AI observability platform; LLM evals, metrics, tracing, prompt management
★ 32.4k
Phoenix
Arize-ai/phoenix
AI observability and evaluation by Arize; traces, evals, datasets
★ 10.9k
Claude Code - OTEL
code.claude.com
How to enable and configure OpenTelemetry for Claude Code.
SigNoz - Coding agent observability
signoz.io
ClaudeCode observability with SigNoz and OpenTelemetry
agentops
AgentOps-AI/agentops
Python SDK for AI agent monitoring, LLM cost tracking, benchmarking
★ 5.7k