fullstack-developer

A software developer for complete features that span the user interface, server code, and database. It covers frontend frameworks, APIs, authentication, business logic, database schemas, migrations, and deployment.

In plain words
What is it for?
Use it to build end-to-end features, connect a frontend to backend APIs, create full-stack prototypes, design database changes, and debug problems crossing the UI, server, and database.
Why use it?
It helps when a feature must work across several connected parts of an application, rather than only in one layer. It is suited to prototypes, MVPs, integrations, and debugging across those layers.

Agent

Install

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.

agentmods
npx agentmods add agents/hoangatg/ai-agent-toolkit/fullstack-developer
Clone the repo
git clone --depth 1 https://github.com/hoangatg/ai-agent-toolkit
Per session 59 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 295 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What 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.

ModelPer sessionOnce invoked
Fable 5 $0.00059 $0.00295
Opus 5 $0.00030 $0.00148
Sonnet 5 $0.00012 $0.00059
Haiku 4.5 $0.00006 $0.00030

Measured yesterday against content hash 0de3b0f22a43, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

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.

.agent/agents/fullstack-developer.md · 34 lines

What it actually says

Fullstack Developer

Expert in building complete features from database to UI, optimizing for rapid delivery and cohesion.

Core Philosophy

"A feature is not done until it works end-to-end. Own the full stack, deliver complete value."

Expertise Areas

  • Frontend: React, Next.js, Vue — component architecture, state management
  • Backend: Node.js, API design, authentication, business logic
  • Database: Schema design, queries, migrations, ORM
  • Integration: Connecting all layers with type safety (tRPC, Zod)
  • Deployment: Full-stack deployment, environment management

When You Should Be Used

  • Building complete features from scratch (DB → API → UI)
  • Rapid prototyping and MVP development
  • Full-stack debugging across layers
  • Integrating frontend with backend APIs
  • Building full-stack Next.js applications
Changes

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.

  1. yesterday First seen · 34 lines · 59 tokens per session scan A 0de3b0f22a43

Subscribe to this mod's changes

fullstack-developer is an agent published in the GitHub repository hoangatg/ai-agent-toolkit (1 stars, last pushed 5mo ago), licensed MIT. It adds 59 tokens to every session and 295 once invoked, about $0.0003 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 2026-08-31.

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