Agent skills for human-AI collaboration and AI-as-expert workflows.
A Claude Code plugin with generic skills for AI agents at Levels-of-AGI 3-4 (Collaborator / Expert) -- stateful patrols, agent-to-agent orchestration, self-improvement, durable infra ops. Works for any team running long-running Claude Code agents; no Yesterday-infra dependencies.
Origin: the skills in this plugin are being migrated from
Yesterday-AI/agentic-foundation, where they were initially curated and developed. yastack is the public-facing curated subset of agent-fit skills without Yesterday-infra dependencies. See NOTICE for full provenance.
A curated set of skills that an AI agent uses to drive interactive work with light human supervision -- read its environment, pick up tasks, ship code, review its own work, persist fixes, learn from corrections.
Audience: the agent itself, not its operator. Operators install yastack so their AI agents can use these skills.
14 generic agent-skills, migrated from Yesterday-AI/agentic-foundation (Phase 1, 2026-04-26):
| Skill | Purpose |
|---|---|
| agent-swarm | Multi-agent orchestration in isolated worktrees |
| agentic-news-digest | Curated team news digests via the full pipeline (sources, fact-check, relevance) |
| capability-check | Self-introspection at session start (tools / sub-agents / skills) |
| forward-momentum | Anti-paralysis discipline; tangible output per interaction |
| github-pr-review | Stateful PR review with inline comments + validation |
| github-workflow | Standard Git/GitHub workflows for autonomous agents |
| issue-patrol-routine | Periodic issue scan, classify into actionable queues |
| issue-to-pr-workflow | End-to-end issue -> implementation -> PR -> feedback loop |
| pm-patrol-routine | PM triage: PR completeness, close resolved issues |
| project-engine | Cron-driven autonomous project orchestration |
| project-tracking | Standardized agent project tracking with YAML frontmatter |
| review-patrol-routine | Stateful PR review patrol with heartbeat cycles |
| self-improving | Corrections become improvements; self-improving memory |
| systemic-persistence | Ensure fixes survive reboots; durable system solutions |
Plus cross-marketplace dependencies (auto-pulled via plugin.json):
| Plugin | Purpose |
|---|---|
| creative-productivity | Deliverables orchestrator (excalidraw + miro + reveal/marp + draw.io) |
| para-memory-files | Agent-side persistence using the PARA method |
| skill-creator | Meta-skill for creating new agent skills (from claude-plugins-official) |
| ydstack | Daily-work skills (excalidraw, exa search, GitHub, slack, web/x scrapers) -- maintained for humans, equally useful when an agent needs them |
opentofu (autonomous infrastructure provisioning) was originally planned for yastack but moved to Yesterday-AI/yopstack on 2026-04-25 -- it fits more naturally in the ops-layer with land-and-deploy, canary, setup-deploy. See .ytstack/DECISIONS.md for the rationale.
Status: Phase 1 of the agentic-foundation -> ystacks migration shipped 2026-04-26. Skills copied with em-dash UX hygiene applied. Source still lives in agentic-foundation/skills/ as a deprecated mirror -- per policy, agentic-foundation stays put (not deleted, not archived). The new home in this repo is the source of truth.
/plugin marketplace add Yesterday-AI/yastack
/plugin install yastack@yastackyastack self-marketplaces -- .claude-plugin/marketplace.json lives in this repo. No additional setup required.
/plugin marketplace add Yesterday-AI/ystacks
/plugin install yastack@ystacksYesterday-AI/ystacks is Yesterday's PUBLIC plugin catalog. Same plugin, listed in two marketplaces -- both install paths fetch the identical content from this public repo.
claude --plugin-dir /path/to/yastackSkills appear under /yastack:<skill-name>. Reload after edits with /reload-plugins.
Yesterday-team needs the same agent skills PLUS Yesterday-infra clients (knowledge base, LLM gateway, fleet management). For convenience there is a bundle plugin in the private Yesterday-AI/ystacks-internal marketplace:
/plugin marketplace add Yesterday-AI/ystacks-internal
/plugin install yastack-internal@ystacks-internalThis pulls yastack (cross-marketplace from ystacks) plus Yesterday-internal service plugins (clawrag, llm-gateway, agent-services) as dependencies. External users do not need this.
Part of Yesterday's plugin family with the y{c}stack naming pattern: ytstack (engineering OS), ydstack (daily-work), yastack (agent core), yopstack (ops core), ycstack (consulting). Plus -internal bundle plugins (yastack-internal, yopstack-internal) in the private ystacks-internal catalog.
yastack/
├── .claude-plugin/
│ └── plugin.json
├── skills/ skills migrated from agentic-foundation (planned)
├── README.md this file
├── CLAUDE.md contributor guide for AI agents
├── LICENSE MIT
├── NOTICE attribution
└── .gitignore
MIT. See LICENSE.
Maintained by Yesterday. Listed in the ystacks public plugin catalog.