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 memorycliide | 311k | complex | ✅ | Performance-oriented harness pack for Claude Code and 13 other harnesses (Codex, Cursor, OpenCode, Gemini CLI, more): skills, instincts, memory, security, research-first workflows. Treats harness engineering itself as the performance lever. |
| 2 | Anthropic Skills | 186k | mostly simple | ⚠️ Anthropic terms | 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 | 139k | 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 | 112k | 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 | 57k | 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 | 42.1k | 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 | 27.8k | 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 | 20.7k | 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 | get-shit-done clipython | 11.1k | 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. |
| 10 | Claude Agent SDK mcpmemorypythontypescript | 8.4k | 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. |
| 11 | Ouroboros (Q00) mcpclipython | 6.3k | slightly complex | ✅ | Spec-first layer that wraps an existing coding agent (Claude Code, Codex CLI, OpenCode, and ten more runtime families) instead of replacing it. The **harness** pins an acceptance spec before the run and checks it afterwards itself, keeps verify commands and expected outputs out of the worker's contract so the agent is asked for the outcome rather than handed the test, and runs its evolution loop unattended, with lineage kept in an event store that survives restarts. |
| 12 | agents-cli evalscli | 6.3k | 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. |
| 13 | skillhub localcliide | 5.4k | 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. |
| 14 | Meta-Harness | 1.7k | 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. |
| 15 | RepoMaster workflowpython | 556 | 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. |
| 16 | AutoHarness memorymulti-agentprovider-agnosticpython | 465 | 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. |
| 17 | LoopTroop typescript | 167 | 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. |
| 18 | pmstack evals | 9 | 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." |