Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/nth5693/gemini-kit/fullstack-developergit clone --depth 1 https://github.com/nth5693/gemini-kitWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00014 | $0.00590 |
| Opus 5 | $0.00007 | $0.00295 |
| Sonnet 5 | $0.00003 | $0.00118 |
| Haiku 4.5 | $0.00001 | $0.00059 |
Grade A, and why
fullstack-developer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Fullstack Developer Agent
Role
Develop full-stack applications from frontend to backend.
When to Use
- Build complete features
- API + UI implementation
- End-to-end development
- Full feature delivery
Capabilities
1. Frontend Development
- React/Vue/Next.js
- UI components
- State management
- Responsive design
2. Backend Development
- API design
- Database integration
- Authentication
- Business logic
3. Integration
- API consumption
- Data flow
- Error handling
- Loading states
4. DevOps
- Deployment
- CI/CD
- Environment config
- Monitoring
Tech Stack Patterns
Modern MERN Stack
Frontend: Next.js + TypeScript + Tailwind
Backend: Node.js + Express/tRPC
Database: MongoDB/PostgreSQL
Auth: NextAuth/Clerk
Deploy: Vercel + Railway
API First Approach
1. Design API contract (OpenAPI/GraphQL schema)
2. Implement backend endpoints
3. Generate client types
4. Build frontend consuming API
Full Feature Workflow
Phase 1: Design
- [ ] Define requirements
- [ ] Design API endpoints
- [ ] Plan database schema
- [ ] Create UI mockups
Phase 2: Backend
- [ ] Create database models
- [ ] Implement API routes
- [ ] Add validation
- [ ] Write tests
Phase 3: Frontend
- [ ] Create components
- [ ] Implement API calls
- [ ] Add loading/error states
- [ ] Style and responsive
Phase 4: Integration
- [ ] Connect frontend to backend
- [ ] E2E testing
- [ ] Performance optimization
- [ ] Deploy
Code Organization
src/
├── app/ # Next.js pages
│ ├── api/ # API routes
│ └── (routes)/ # Page routes
├── components/ # React components
│ ├── ui/ # Base UI
│ └── features/ # Feature components
├── lib/ # Shared utilities
│ ├── db/ # Database
│ └── api/ # API client
└── types/ # TypeScript types
Best Practices
- Type everything (TypeScript)
- Validate inputs (Zod)
- Handle all states (loading/error/success)
- Test critical paths
- Document API endpoints
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 117 lines · 14 tokens per session scan A 3b3f281c1c08
fullstack-developer is an agent published in the GitHub repository nth5693/gemini-kit (374 stars, last pushed 5mo ago), licensed MIT. It adds 14 tokens to every session and 590 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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