Agent Builder Skill

Agent Builder Skill

Build and deploy Claude Agent SDK applications to your Hetzner VPS.

Metadata

• Name: agent-builder
• Version: 1.1.0
• Author: KnearMe
• Tags: claude, agent-sdk, skills, vps, deployment

When to Use

Use this skill when:

• Creating a new AI agent application (coding or non-coding use cases)
• Designing agent behavior, escalation paths, and decision boundaries
• Deploying agents to the Hetzner VPS
• Setting up multi-agent architectures
• Troubleshooting agent deployments

Non-Dev First Principle

Always consider non-development use cases. Many high-value agents are workflow-focused, not code-focused:

• Customer support triage
• Sales qualification
• Operations checklists
• Marketing content coordination
• Finance/​QA reviews
• Hiring or onboarding workflows

If the request is non-dev or mixed, start with discovery and workflow design before writing code.

Start Here (Design → Build)

1. Define the outcome, user, and trigger → references/​agent-design-guide.md
2. Choose an architecture pattern → references/​architectures.md
3. Select tools with least-privilege → references/​tool-development.md
4. Define roles + escalation rules → references/​role-definition.md
5. Instrument + improve → references/​performance-monitoring.md + references/​improving-agents.md
6. Add UX if needed → references/​ui-development.md
7. Test before shipping → references/​testing-guide.md

Reference Map (Progressive Disclosure)

• references/​agent-design-guide.md — Discovery, use-case fit, tool decision trees, anti-patterns
• references/​architectures.md — Single, orchestrator+subagents, multi-agent fleets
• references/​role-definition.md — Role prompts, delegation patterns, escalation triggers
• references/​tool-development.md — Tool selection, MCP tools, guardrails
• references/​performance-monitoring.md — Metrics, budgets, alerts, logs
• references/​improving-agents.md — Feedback loops, evals, regression tests
• references/​ui-development.md — Chat UX patterns + component examples
• references/​testing-guide.md — Test strategy, fixtures, mocks, evals
• references/​react-chat-component.tsx — Ready-to-use chat UI (React)
• references/​agent-template.ts — Complete agent server template
• references/​non-dev-templates.md — Expanded non-dev templates (support, sales, ops, marketing, finance)
• references/​background-agents.md — Background/​autonomous role execution patterns
• references/​self-improving-agents.md — Self-improving agent loop (AlphaEvolve patterns)

Claude Code Skill Authoring Rules

• Required frontmatter: name (lowercase, hyphen/​underscore) and description (what the skill does + when to use).
• Optional allowed-tools: If present, it limits tools in Claude Code. If omitted, tools are not restricted by the skill file.
• Keep it short: Aim to keep SKILL.md under ~500 lines and move long content into references/.
• Progressive disclosure: Link reference files at most one level deep (no nested reference chains).

Quick Start

Create New Agent

mkdir my-agent && cd my-agent
npm init -y
npm install @anthropic-ai/​claude-agent-sdk express ws
# See references/​agent-template.ts for a full server template

Deploy to VPS (Short Version)

• Run scripts/​setup-vps.sh once per server
• Use scripts/​deploy-agent.sh per agent
• See references/​architectures.md for multi-agent deployments

Non-Dev Agent Templates

Use these when the goal is business workflow impact, not coding. Expanded templates: references/​non-dev-templates.md

1) Support Triage Agent

• Outcome: Accurate category + next action in <2 minutes
• Trigger: New ticket or chat created
• Inputs: Ticket text, user plan, last 5 interactions
• Outputs: Priority, summary, suggested response, escalation flag
• Tools: Read, Glob, Grep, AskUserQuestion (Write for drafts)
• Escalate when: Refunds, security, legal threats, angry users
• Pattern: Single agent → Orchestrator+Subagents as volume grows

2) Sales Qualification Agent

• Outcome: Score lead + recommended next step
• Trigger: Inbound form or sales inbox message
• Inputs: Form fields, source, company size, prior contact
• Outputs: Fit score, objections, suggested reply
• Tools: Read, Glob, Grep, AskUserQuestion (Write for drafts)
• Escalate when: Enterprise/​legal requirements, pricing exceptions
• Pattern: Single agent

3) Ops Checklist Agent

• Outcome: Runbook completed with clear status
• Trigger: Daily/​weekly ops cadence, incident checklist
• Inputs: Runbook file, system status snapshots
• Outputs: Checklist state, anomalies, recommended follow-ups
• Tools: Read, Glob, Grep (Bash only if strictly required)
• Escalate when: Missing signals, critical thresholds
• Pattern: Single agent (orchestrator if many systems)

4) Marketing Content Coordinator

• Outcome: On-brand draft + distribution checklist
• Trigger: New campaign request or content brief
• Inputs: Brand voice docs, product updates, target persona
• Outputs: Draft content, channel checklist, CTA options
• Tools: Read, Glob, Grep, Write, Edit
• Escalate when: Claims need legal review, sensitive topics
• Pattern: Orchestrator+Subagents (researcher/​writer/​reviewer)

5) Finance/​QA Review Agent

• Outcome: Flag anomalies + recommend follow-ups
• Trigger: Monthly close, QA batch, or audit request
• Inputs: Reports, threshold rules, last period baselines
• Outputs: Findings list, confidence, next steps
• Tools: Read, Glob, Grep (no Write unless drafting)
• Escalate when: Large variances, policy violations
• Pattern: Single agent with strict constraints

Non-Dev Decision Checklist

• Is the source of truth clear and accessible?
• What actions are advisory vs automatic?
• What requires human approval?
• What are the escalation triggers?
• What does success look like in measurable terms?
• What is the lowest-risk toolset that still works?

Background Agents (Summary)

• Use job-based execution for discrete tasks (events, cron).
• Use continuous execution for live routing and monitoring.
• Map authority to an autonomy ladder and enforce escalation rules.
• See references/​background-agents.md for full patterns.

Self-Improving Agents (Summary)

• Use a generate → evaluate → promote loop with automated evaluators.
• Treat best prompts/​workflows as a "skill library" that evolves over time.
• Only promote when metrics improve on a fixed regression suite.
• See references/​self-improving-agents.md for AlphaEvolve-inspired patterns.

Architecture Patterns (Summary)

• Single Agent: One domain, simple logic
• Orchestrator + Subagents: Multi-specialty, parallel work
• Multi-Agent Fleet: Separate products/​domains
• See references/​architectures.md for the full decision tree

SDK Essentials (Summary)

const response = query({
  prompt,
  options: {
    systemPrompt,
    allowedTools: ["Read", "Glob", "Grep", "Task", "Skill"],
    agents: SUBAGENTS,
    permissionMode: "acceptEdits",
    settingSources: ["user", "project"],
  },
});

• Task must be in allowedTools for subagents to spawn
• Subagents cannot spawn other subagents
• Skills load only with settingSources and "Skill" in allowedTools
• Include "project" to load CLAUDE.md instructions
• allowed-tools frontmatter applies to Claude Code CLI, not SDK
• See references/​agent-template.ts for streaming/​session examples

Deployment & Ops (Summary)

• Use scripts/​setup-vps.sh + scripts/​deploy-agent.sh
• Put Nginx + SSL in front of web UIs
• Track latency, cost, and error budgets (references/​performance-monitoring.md)
• Add feedback loops and evals (references/​improving-agents.md)

Testing & Quality (Summary)

• Test behavior, not phrasing; keep regression fixtures
• Validate tool safety boundaries and escalation paths
• See references/​testing-guide.md for full patterns

Resources

Claude Agent SDK Docs: https://docs.anthropic.com/claude-code/agent-sdk
Hetzner Cloud Console: https://console.hetzner.cloud
PM2 Documentation: https://pm2.keymetrics.io/docs
Cloudflare Tunnel Docs: https://developers.cloudflare.com/cloudflare-one/connections/connect-apps

Scripts

• scripts/​setup-vps.sh - Initial VPS configuration
• scripts/​deploy-agent.sh - Deploy a new agent
• scripts/​new-agent.sh - Scaffold a new agent project