AgentSystem

Website: agentsystem.dev · Mission Control Pro: agentsystem.dev

npx @agentsystemlabs/core init --harness claude

A Claude Code plugin marketplace providing agentsystem-core — 37 skills focused on forcing AI to ship production-ready code: feature delivery, debugging, code-quality enforcement, audits, release management. The core plugin also ships 16 read-only reviewer subagents that the skills fan out to for security, perf, contracts, concurrency, data-integrity, accessibility, and bundle audits.

Install

Claude Code (plugin marketplace)

/plugin marketplace add https://github.com/AgentSystemLabs/core
/plugin install agentsystem-core@agentsystem

To update later: /plugin marketplace update agentsystem. To remove: /plugin uninstall agentsystem-core@agentsystem.

Manual install (any tool that reads SKILL.md)

For users not on Claude Code — Claude Agent SDK, Cursor, custom agents, or anything that loads Anthropic-format skills from disk — install via the npm CLI:

# One-shot via npx
npx @agentsystemlabs/core init                                    # → ./.claude/{skills,agents}/
npx @agentsystemlabs/core init --harness codex                    # → ./.codex/{skills,agents}/
npx @agentsystemlabs/core init --harness cursor                   # → ./.cursor/{skills,agents}/
npx @agentsystemlabs/core init --harness opencode                 # → ./.opencode/{skills,agents}/
npx @agentsystemlabs/core init --global                           # → ~/.claude/{skills,agents}/
npx @agentsystemlabs/core init --harness codex --global           # → ~/.codex/{skills,agents}/
npx @agentsystemlabs/core init --harness cursor --global          # → ~/.cursor/{skills,agents}/
npx @agentsystemlabs/core init --harness opencode --global        # → ~/.config/opencode/{skills,agents}/
npx @agentsystemlabs/core init --plugin core                      # subset (short name)
npx @agentsystemlabs/core init --dest ./my-skills                 # custom skills path
npx @agentsystemlabs/core init --skip-agents                      # skills only, no subagents
npx @agentsystemlabs/core list                                    # show available skills + subagents
npx @agentsystemlabs/core uninstall                               # remove installed skills + subagents

# Or install globally
npm install -g @agentsystemlabs/core
agentsystem init

Each skill lands as <harness-root>/skills/<skill-name>/SKILL.md (with its references/ folder if present), so any agent that reads SKILL.md format picks them up directly. Subagents land in parallel at <harness-root>/agents/<agent-name>.<ext> — .md for Claude Code and Cursor (which read the same format), .toml for Codex (auto-converted from the source .md with descriptions truncated to Codex's 1024-char limit), and OpenCode-native .md for OpenCode (adds mode: subagent and read-only permissions). The supported harnesses are claude (alias: claude-code), codex, cursor (alias: cursor-cli), and opencode; --dest overrides the skills path and --agents-dest overrides the subagents path. By default init skips files that already exist — pass --force to overwrite. The --plugin flag accepts short names (e.g., core for agentsystem-core), can be repeated, or comma-separated. Pass --skip-agents to install only the skills.

OpenCode

OpenCode can run alongside Codex, Copilot, and OpenCode Go plan in the same project. Install AgentSystem skills and subagents into OpenCode's native layout:

npx @agentsystemlabs/core init --harness opencode                 # project: .opencode/{skills,agents}/
npx @agentsystemlabs/core init --harness opencode --global          # global: ~/.config/opencode/{skills,agents}/

Skills are discovered from .opencode/skills/*/SKILL.md and loaded on demand via OpenCode's skill tool. Subagents are written as markdown agents with mode: subagent so primary agents (Build, Plan) can invoke them via @mention or the Task tool. See the OpenCode agents, skills, and plugins docs for configuration beyond the install step.

Autopilot — start here

/ship <describe your goal>

/ship is the front door. Hand it any engineering goal and it does three things you'd otherwise have to do yourself:

1. Classifies intent — CREATE / EVOLVE / POLISH / REMOVE / FIX / AUDIT — from your phrasing.
2. Picks a depth mode — fast / balanced / production — from risk and complexity signals (auth, payments, migrations, destructive deletions, jobs/webhooks, external APIs, cache invalidation, concurrency-sensitive mutations, and multi-subsystem changes auto-bump to production).
3. Routes to the matching core skill (add-feature, modify-feature, polish-ui, remove-feature, fix-bug, audit) with the resolved mode, announces the pipeline, and runs it.

It deliberately stops at "code is production-ready" — never commits, pushes, or opens PRs. After it finishes, choose how to publish: /commit (grouped commits only), /commit-and-push, or /open-pr.

# auto-infer everything
/ship "add stripe webhook handler"            # → CREATE + production (touches payments)
/ship "tweak the navbar color"                # → EVOLVE + fast (cosmetic)
/ship "the login button doesn't redirect"     # → FIX + balanced
/ship "delete the old beta-flags page"        # → REMOVE + balanced

# explicit overrides
/ship "scaffold a settings page" mode=fast
/ship "add OAuth flow" mode=production skip=7c

# call the underlying core skill directly when you don't want orchestration
/add-feature "scaffold a settings page" mode=fast

The core skills (add-feature, modify-feature, fix-bug, remove-feature) all accept mode=fast|balanced|production and include= / skip= overrides — /ship is sugar over them, not a replacement.

Skills in agentsystem-core

Workflow & Planning

• /ship — Autopilot orchestrator. Classifies intent, picks a depth mode, routes to the right core skill. Stops at code-ready.
• /add-feature — End-to-end feature delivery in an existing codebase: clarify → explore → design → plan-approval gate → implement → verify → gated reviews → tests. Enforces UI-convention parity (modals/forms/drawers/dialogs must match siblings).
• /modify-feature — Adds a small extension to an existing feature. Pre-flight interrogates the proposed shape, surfaces alternative seams, audits shifted contracts, then runs gated checks.
• /remove-feature — Leaf-first deletion with persisted-data awareness (existing rows holding values from removed enums/columns are first-class concerns). Honors mode=fast|balanced|production.
• /testing-plan — Produce a concrete manual-QA testing plan (actor / route / expected result) for a branch or feature. Refuses to invent credentials; append-not-overwrite.

Debugging & Fixing

• /fix-bug — Diagnose silent integration failures by leading with the runtime contract before hypotheses. Trigger / dispatch / receive / observe trace. Modes: fast / balanced / production.
• /fix-pr-tests — Classify a failing PR test as real-bug / stale-test / flake (3× re-run rule), then fix the right side. Never edits CI config to make a test pass.
• /add-regression-test — Pin a bug fix with a test that fails without the fix and passes with it. Modes A/B/C/D for staged / committed / squashed states.
• /handoff-codex — Hand off a stalled task to the OpenAI Codex CLI for a second pass. Builds a handoff packet (original goal, what was tried, live diff), fires codex exec headless, verifies what changed.
• /resolve-conflict — Walk a merge/rebase conflict file by file. Identical/complementary/incompatible block typology, lockfile-regenerate vs hand-merge, never --theirs on a source file without reading both.

Code Quality & Refactor

• /audit — Whole-codebase tech-debt sweep. Maps architecture + data flow, then orchestrates every audit-* skill and reviewer-* subagent across the repo. Gates mechanical vs structural fixes.
• /simplify — Diff-scoped refactor pass with parallel agent fan-out (Reuse / Quality / Efficiency). Magic numbers, naming, oversized files, parallel-enum drift, repeated literals. Per-fix safety-net rule.
• /realign — Update a code model (types, state machines, vocabulary, persisted data) to match changed business requirements. Migrates persisted-data values as a first-class step.
• /harden-types — Strip any, dangerous casts, missing return types, missing boundary validation. Mechanical / structural / legitimate classification.
• /add-migration — Schema migration with three-class taxonomy (additive / mutating / destructive), explicit multi-step rollout plan, CONCURRENTLY awareness, NOT-NULL-on-populated-table trap, DEFAULT now() per-row gotcha.
• /add-observability — Add structured logging, metrics, traces at the right boundaries. Replaces silent failure paths with explicit logs + telemetry.
• /audit-authz — Identity vs ownership separation, IDOR detection, webhook-signature awareness on every server-side entry point.
• /write-tests — Write tests for an existing code path. Smoke-test hard gate; real test DB over mocks; never mock the layer the bug lives in.
• /add-e2e-test — Playwright workflow with explicit smoke gate, selector preference order, 3× flake check.
• /reorganize-files — Reorganize a directory into a clear grouped layout, then update every reference (static imports, ?url, import.meta.glob, CSS url(), OG metadata). Five reference styles tracked separately.

UX & UI

• /polish-ui — Apply a UX polish checklist to existing UI without changing behavior. Auto-fixes mechanical gaps inline.
• /propagate-ui-pattern — Sibling sweep with per-instance APPLY/SKIP/ASK. Rule-of-three extraction gate; behavior+affordance pairing.
• /add-empty-error-states — Three-state UI model (loading / empty / error) with concrete tsx examples. Handles useSuspenseQuery error boundary correctly.
• /audit-a11y — Whole-app accessibility audit with WCAG thresholds. Sensible auto-fix vs structural split.
• /audit-responsive — Whole-app responsive audit. Inline failure-mode catalog with Tailwind snippets, 4 canonical viewports, 100vh vs 100dvh vs 100svh distinction.
• /audit-perf — Whole-app performance audit. Evidence-anchored — no potential findings.
• /audit-seo-meta — Tag-by-tag SEO/meta severity table. Distinguishes per-route vs repo-level.
• /audit-analytics — Analytics-event coverage audit. SDK detection table, PII classification with severity, MUST/SHOULD/OK rubric.

Release & Docs

• /commit — Split the working tree into one or more logically-grouped commits (schema → backend → frontend; deps before consumers; types before usages). Detects conventional-commits style; never pushes.
• /commit-and-push — Run /commit, then push the current branch to its remote (sets upstream with -u when missing). Never force-pushes.
• /open-pr — Open a GitHub PR from an already-committed branch. Three-dot diff, draft detection, mandatory confirmation gate, integrates release-risk briefing.
• /release — Cut a versioned release. Multi-manifest detection (package.json, pyproject.toml, Cargo.toml, VERSION), plugin-marketplace diff-driven bump, dirty-tree refusal, push-confirm gate.
• /check-pr-readiness — Fail-fast gauntlet before pushing: typecheck, lint, format-only auto-fix, lockfile-aware residue sweep on added lines only.
• /check-release-risk — Pre-publish risk briefing invoked by /commit-and-push, /open-pr, /release. Seven categorizers (public API, persistence, auth, env vars, manual QA, doc/changelog drift, rollback). Informs; never blocks.
• /address-pr-comments — Resolve unresolved GitHub PR review threads end-to-end. Fans out one pr-comment-resolver subagent per thread; sequential commits (one per thread); replies + resolves via the GitHub API.
• /update-changelog — Append a categorized entry to CHANGELOG.md. Canonical emoji set; dedup check; "would a user a year from now care".
• /sync-docs — Update existing project documentation in-place after code changes (Swagger/OpenAPI, README, ADRs, .env.example, setup guides). Never creates new doc files.

Reviewer subagents (read-only, in agentsystem-core/agents/)

The skills above fan out to these read-only subagents for diff-scoped audits. They never edit files; they return severity-ranked findings with file:line refs and concrete fix snippets. They are invoked indirectly by the orchestrating skills (add-feature, modify-feature, fix-bug, audit, etc.); you generally don't call them directly.

| Subagent | What it catches | |---|---| | reviewer-authz | Missing/wrong access checks on server entry points; IDOR; role-without-scope; unsigned webhooks. | | reviewer-security-regression | Logged/leaked secrets, SSRF, unsafe uploads, dangerous HTML, open redirects, missing rate limits. | | reviewer-data-integrity | NOT NULL without backfill, orphan-creating deletes, missing DB constraints, unsafe migrations, stale fixtures. | | reviewer-contracts | Producer/consumer drift — server fn ↔ client, zod ↔ DB, route params ↔ links, stale generated clients. | | reviewer-concurrency | Double-submit duplicates, missing idempotency on webhooks, read-modify-write races, missing transactions, stale async writes. | | reviewer-error-boundaries | Promise rejections leaking to blank screens, server errors becoming generic toasts, double-submit on failure, loader without errorComponent. | | reviewer-loading-states | Submit buttons not disabled, spinner-vs-skeleton inconsistency, optimistic updates without rollback, missing pendingComponent. | | reviewer-accessibility-regression | Icon buttons missing names, dialogs missing focus trap, custom clickable divs, unbound labels, missing alt. (Changed-files only — /audit-a11y is the whole-app sibling.) | | reviewer-client-bundle | Server-only modules in client bundles, non-public env vars in client files, heavy deps added to first-load, lodash full-imports, oversized assets. | | reviewer-observability-coverage | Critical paths without structured logs, swallowed errors, missing correlation ids on jobs/webhooks, PII in log lines. | | reviewer-perf | N+1 queries, missing indexes, oversized SELECT *, sequential awaits, unmemoized hot paths, unbounded fetches, missing virtualization. | | runtime-contract-tracer | Trace an integration end-to-end: trigger → dispatch → receive → observe — with file:line refs. Used by /fix-bug to map silent integration failures. | | crud-surface-mapper | Inventory every place the user creates / edits / configures / imports / duplicates an artifact (Task, Project, etc.) so new fields ship to every CRUD touchpoint. | | ui-pattern-inspector | Returns a sibling-instance inventory for recurring UI surfaces (Modal, Dialog, Drawer, Form, Card, Toast) with convention summary (hotkeys, focus, footer chrome). | | utility-finder | Pre-write lookup for existing helpers — returns ranked candidates with reuse/extend/write-new verdict. Prevents duplicate utilities at the source. | | pr-comment-resolver | Per-thread subagent used by /address-pr-comments. Reads, classifies, applies the fix, replies via the GitHub API, resolves the thread. |

Notes on conventions

Every skill in this marketplace follows a few shared conventions:

• AskUserQuestion protocol — Skills never print numbered options for the user to type a number; they invoke the AskUserQuestion tool for an interactive picker. Free-form questions stay in prose.
• NEVER sections — Each skill ends with a NEVER section. Every entry follows the pattern **NEVER X** / **Instead:** Y / **Why:** Z so the model can judge edge cases, not just follow rules.
• Mode tiers — Core delivery skills (add-feature, modify-feature, fix-bug, remove-feature, audit, ship) accept mode=fast|balanced|production plus include= / skip= overrides.
• Subagent dispatch — Where reviewers exist as both a skill (whole-repo) and a subagent (diff-only), the skill is the user-invocable entry; the subagent is the read-only report-only variant the skills fan out to.

License

See LICENSE in the repository root.