DVstack

DVstack is an open source plugin marketplace I created to share skills and working files from my own projects.

This is a knowledge collection, not a product. The README only covers plugins that are in the tree.

What's here now: a font switcher, fifteen Playwright testing skills, light agent-ops habits (including a marketplace router and short self-checks), and one harness-engineering skill for the system around the agent.

Ladder: ops-bar (quality bar) → session (token hygiene) → rigor (when to deepen) → harness (system around the agent). Harness owns contracts, tools, verify, and recover; agents stay light habits.

How it's organized

A skill is one unit of knowledge — a SKILL.md plus the real files that go with it. A plugin is a group of related skills with a manifest, so a whole topic installs in one command and updates with the repository. Each plugin also ships Claude Code commands/ that force-load a skill or the whole testing pack.

dvstack/
├── AGENTS.md                         # thin pointers, including using-dvstack
├── CLAUDE.md                         # same pointers for Claude Code
├── CONTRIBUTING.md                   # how to add a plugin, skill, or command
├── CONSTRAINTS.md                    # what this marketplace is allowed to ship
├── docs/using-commands.md            # Claude vs Cursor vs Grok: how to force a skill
├── scripts/check-marketplace.mjs     # marketplace, skill, and command-frontmatter checks
├── .github/workflows/marketplace.yml
├── .claude-plugin/marketplace.json   # marketplace manifest (Claude Code)
├── .cursor-plugin/marketplace.json   # marketplace manifest (Cursor)
└── plugins/
    ├── agents/                       # dvstack-agents
    │   ├── .claude-plugin/plugin.json
    │   ├── .cursor-plugin/plugin.json
    │   ├── commands/                 # ops-bar, session, rigor, using-dvstack, …
    │   └── skills/
    │       ├── using-dvstack/
    │       ├── agent-ops-bar/
    │       ├── agent-session/
    │       ├── agent-rigor/
    │       ├── anti-rationalization/
    │       ├── doubt-check/
    │       └── source-check/
    ├── frontend/                     # dvstack-frontend
    │   ├── .claude-plugin/plugin.json
    │   ├── .cursor-plugin/plugin.json
    │   ├── commands/                 # font-switcher
    │   └── skills/
    │       └── font-switcher/        # SKILL.md + src/ + examples/
    ├── harness/                      # dvstack-harness
    │   ├── .claude-plugin/plugin.json
    │   ├── .cursor-plugin/plugin.json
    │   ├── commands/                 # harness
    │   └── skills/
    │       └── harness-engineering/  # SKILL.md
    └── testing/                      # dvstack-testing
        ├── .claude-plugin/plugin.json
        ├── .cursor-plugin/plugin.json
        ├── commands/          # playwright (whole pack) + one file per skill
        └── skills/            # 15 Playwright skills
            ├── playwright-naming-conventions/
            ├── playwright-test-architecture/   # SKILL.md + files/ to copy
            ├── playwright-test-strategy/
            ├── playwright-step-validation/
            ├── playwright-fixtures/
            ├── playwright-locators/
            ├── playwright-api-testing/
            ├── playwright-network-mocking/
            ├── playwright-hard-interactions/
            ├── playwright-accessibility-testing/
            ├── playwright-visual-testing/
            ├── playwright-code-review/
            ├── playwright-debugging/
            ├── playwright-flaky-tests/
            └── playwright-ci/

Plugin	Covers	Status
agents	Light-by-default agent habits: marketplace router, quality bar, session hygiene, when to deepen, anti-rationalization, doubt-check, source-check	7 skills
frontend	Front-end implementation skills that ship with working source files	1 skill
harness	The system around the model: task contracts, tool gates, verify/recover, durable state, feature maps, hard CI	1 skill
testing	Playwright: architecture, strategy, step validation, fixtures, locators, API, mocking, hard interactions, a11y, visual, review, debugging, flaky tests, CI	15 skills

Install

Claude Code

claude plugin marketplace add vardanyandavit/dvstack
claude plugin install dvstack-agents@dvstack
claude plugin install dvstack-frontend@dvstack
claude plugin install dvstack-harness@dvstack
claude plugin install dvstack-testing@dvstack

Cursor — add this repository as a plugin marketplace, then install dvstack-agents, dvstack-frontend, dvstack-harness, or dvstack-testing.

Once installed, a normal request is enough: ask "add a font switcher" and the agent picks the skill up on its own. No link, no copy step.

Commands

To force a skill (or the whole Playwright pack) instead of hoping auto-discovery fires:

• Claude Code: /dvstack-testing:playwright or /dvstack-testing:playwright-locators (namespaced in /help).
• Cursor: / or @ plus the skill name, or ask "use dvstack-testing".
• Grok Bot / other SKILL.md readers: / or @ if the skill is in that tool's library; otherwise copy the folder or paste the GitHub URL.

See docs/using-commands.md. Commands load skills; they do not invent a second rulebook.

Using a single skill without the plugin

Every skill folder is self-contained, so it also works on its own in any tool that reads SKILL.md:

Copy the skill folder to	Who sees it
~/.claude/skills/<name>/	Claude Code, all your projects
~/.cursor/skills/<name>/	Cursor, all your projects
.claude/skills/<name>/ or .cursor/skills/<name>/ in a repo	That project only

cp -R plugins/frontend/skills/font-switcher ~/.claude/skills/font-switcher

Any other AI. Send the folder URL, for example https://github.com/vardanyandavit/dvstack/tree/main/plugins/frontend/skills/font-switcher, and ask it to implement that skill.

To add a plugin, skill, or command, see CONTRIBUTING.md. Marketplace limits: CONSTRAINTS.md.

What's here now

dvstack-agents — light habits. Not the harness.

• using-dvstack — which DVstack plugin or skill applies; prefer the narrowest; slash command = force-load.
• agent-ops-bar — quality bar scaled to blast radius: outcome and constraints first, one honest verify command in project rules, encode misses, no extra work.
• agent-session — session and token hygiene: context budget, model choice, quiet logs, clear between tasks, side agents that return conclusions.
• agent-rigor — when to deepen only: restate, demand evidence, escalate model or effort, time-boxed exploration when ambiguity or risk is high.
• anti-rationalization — excuse vs reality: skipping verify, "looks right", expanding scope, inventing APIs from memory.
• doubt-check — one self-adversarial pass on a non-trivial decision; not a multi-model bakeoff.
• source-check — installed version + official docs for framework code; cite URLs; flag UNVERIFIED.

dvstack-frontend

• font-switcher — a drop-in font picker for React or plain HTML/JS projects: heading and body font pairs, fonts downloaded only when needed, live previews, and the choice remembered across visits.

dvstack-harness — the heavy system around the agent. Quality bar and session hygiene stay in dvstack-agents.

• harness-engineering — task contracts, compiled context, tool gateway, permissions, durable state, feature maps, hard CI, verify-to-reject, recover, and change receipts. Skip for short low-risk tasks.

dvstack-testing — fifteen Playwright skills: naming conventions, suite architecture, test strategy, step validation and waiting, fixtures, locators, API-driven setup, network mocking, hard interactions (iframes, dialogs, downloads, drag and drop), accessibility, visual testing, code review, debugging, flaky-test triage, and CI. Page objects injected through fixtures, everything else in constants/, data/, and helpers/, and every test.step closing with a validation that proves the app moved on — never a hard-coded timeout. Force the pack with /dvstack-testing:playwright after install. See the plugin README for the full table.

Status

Early. Public.

License

MIT. Free to use, copy, change, and share — including in commercial projects. Keep the copyright notice. No warranty.

The typefaces the font switcher loads from Google Fonts are not in this repo. They stay under their own SIL Open Font License terms.

Author

Created and maintained by Davit Vardanyan (@vardanyandavit).