Coding harness configs and SDKs
Skill packs, slash-command libraries, meta-prompting frameworks, and official SDKs that give you the harness (the agent loop, planning, memory, hooks) without bundling a specific IDE or CLI shell.
| # | Project | Stars | Tier | OSS | Description |
|---|---|---|---|---|---|
| 1 | superpowers memoryide | 265k | complex | ✅ | Performance-oriented harness pack for Claude Code, Codex, OpenCode, Cursor: skills, instincts, memory, security, research-first workflows. Treats harness engineering itself as the performance lever. |
| 2 | Anthropic Skills | 166k | mostly simple | ✅ | Anthropic's official Agent Skills repository: SKILL.md-based folders (instructions, scripts, resources) Claude dynamically loads on Claude Code, Claude.ai, and the API. The reference for progressive-disclosure skill packs in 2026. |
| 3 | GStack typescript | 126k | slightly complex | ✅ | Garry Tan's Claude Code skill stack: 23 slash-command modes (CEO/eng/design review, QA, ship, browse, retro, …) that structure one assistant as a virtual engineering team. Daily driver while running YC. |
| 4 | addyosmani/agent-skills workflowide | 81.3k | mostly simple | ✅ | Addy Osmani's production-grade skill pack: 24 engineering skills and 4 specialist agent personas that encode senior-dev workflows (spec through deploy) across 70+ coding agents including Claude Code, Cursor, and Copilot. The **harness** contribution is the skill/workflow layer, not a new agent loop. |
| 5 | awesome-claude-code | 51.5k | super simple | ❓ | Large community-curated index of Claude Code skills, slash commands, status lines, and plugins—resources for extending the harness, not a harness itself, but the most-followed catalog of the genre. |
| 6 | wshobson/agents multi-agentcliide | 38.4k | super simple | ✅ | Cross-harness marketplace of drop-in subagents and skills for Claude Code, Codex CLI, Cursor, OpenCode, and Copilot; specialized, production-ready agent definitions you install rather than hand-write. |
| 7 | planning-with-files memory | 25.9k | mostly simple | ❓ | Skill for persistent, file-based planning across long-running coding-agent sessions: crash-proof markdown plans, session recovery after `/clear`/compaction, and a deterministic completion gate—Manus-style planning as a drop-in **harness** layer via the Agent Skills standard. |
| 8 | SWE-agent memoryevalspython | 20k | slightly complex | ✅ | LM-driven harness built for SWE-bench: edit state, command execution, and issue-focused loop—the reference agent stack next to the benchmark itself. |
| 9 | Claude Agent SDK mcpmemorypythontypescript | 7.8k | complex | ✅ | Official Anthropic SDK (Python + [TypeScript](https://github.com/anthropics/claude-agent-sdk-typescript), [demos](https://github.com/anthropics/claude-agent-sdk-demos), [quickstarts](https://github.com/anthropics/claude-quickstarts)): built-in tools, MCP, long-running coding agents with session bridging. |
| 10 | get-shit-done clipython | 7.6k | mostly simple | ✅ | Goal-backward planning and wave-based execution over fresh context windows; avoids context rot by design. Python/JS meta-prompting for Claude Code, OpenCode, Gemini CLI. |
| 11 | agents-cli evalscli | 5.5k | mostly simple | ❓ | Google's official CLI and skill pack that layers agent-creation, evaluation, and deployment skills on top of whatever coding assistant you already run, rather than shipping its own agent loop—the **harness** as a config/skills add-on, not a new runtime. |
| 12 | skillhub localcliide | 4.8k | mostly simple | ❓ | iFlytek's self-hosted registry for publishing, versioning, and governing agent skill packages—the **harness** config layer treated as an enterprise artifact store rather than a CLI or IDE shell. |
| 13 | Meta-Harness | 1.4k | slightly complex | ❓ | Reference implementation from the Meta-Harness paper: an academic testbed for harness-engineering research, not a product—useful as a citation-grade baseline rather than something you'd run in production. |
| 14 | RepoMaster workflowpython | 541 | slightly complex | ❓ | Repo-scoped research harness: builds function-call and module-dependency graphs to explore only what's needed; large relative gains on MLE-bench and GitTaskBench with lower token use. |
| 15 | AutoHarness memorymulti-agentprovider-agnosticpython | 363 | super simple | ✅ | Lightweight governance harness: wraps any LLM client in ~2 lines for automated harness engineering—6–14 step pipeline, YAML constitution, risk-pattern matching, session persistence with cost tracking, multi-agent profiles. |
| 16 | LoopTroop typescript | 106 | mostly simple | ✅ | Config layer that chains LLM councils for planning, Ralph loops for iterative refinement, and OpenCode worktrees for shipping. The **harness** contribution is the council → loop → worktree pipeline; OpenCode underneath executes. |
| 17 | pmstack evals | 8 | super simple | ✅ | Claude Code config for AI product managers: CLAUDE.md plus skills for competitive analysis, PRD-from-signal, metric frameworks, stakeholder briefs, and agent eval design. "GStack for PMs." |