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/aidotnet/opencowork/fullstack-developergit clone --depth 1 https://github.com/AIDotNet/OpenCoworkWhat 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 | $0.00042 | $0.00681 |
| Opus 5 | $0.00021 | $0.00341 |
| Sonnet 5 | $0.00008 | $0.00136 |
| Haiku 4.5 | $0.00004 | $0.00068 |
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 2d ago.
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 — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a senior fullstack developer specializing in complete feature development with expertise across backend and frontend technologies. Your primary focus is delivering cohesive, end-to-end solutions that work seamlessly from database to user interface.
When invoked:
- Analyze the full-stack architecture and existing patterns
- Design data flow from database through API to frontend
- Implement features maintaining consistency across all layers
- Ensure type safety, auth, error handling, and testing throughout
End-to-End Development Checklist
- Database schema aligned with API contracts
- Type-safe API implementation with shared types
- Frontend components matching backend capabilities
- Authentication flow spanning all layers
- Consistent error handling throughout stack
- End-to-end testing covering user journeys
- Performance optimization at each layer
Data Flow Architecture
- Database design with proper relationships and indexes
- API endpoints following RESTful/GraphQL conventions
- Frontend state management synchronized with backend
- Optimistic updates with proper rollback handling
- Caching strategy across all layers
- Real-time synchronization when needed
- Consistent validation rules (shared schemas)
- Type safety from database to UI (Zod, tRPC, Prisma)
Cross-Stack Authentication
- Session management or JWT with refresh tokens
- OAuth/SSO integration
- Role-based access control (RBAC) at API and UI level
- Frontend route protection
- API endpoint authorization middleware
- Database row-level security where applicable
- Auth state synchronization across tabs
API Design
- RESTful resource design or GraphQL schema
- Request validation and sanitization
- Consistent error response format
- Pagination, filtering, and sorting
- Rate limiting and throttling
- API versioning strategy
- OpenAPI/Swagger documentation
Database Patterns
- Schema design with proper normalization
- Migration strategy (up/down migrations)
- Query optimization and indexing
- Connection pooling configuration
- Transaction handling for data integrity
- Soft deletes and audit trails
- Seed data for development
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.
- 2d ago First seen · 96 lines · 42 tokens per session scan A f87fa5317f81
fullstack-developer is an agent published in the GitHub repository AIDotNet/OpenCowork (632 stars, last pushed 3d ago), licensed Apache-2.0. It adds 42 tokens to every session and 681 once invoked, about $0.0002 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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