fullstack-dev

A skill for building features that include both the server side and the user interface. It covers connected work such as APIs, authentication, data management, validation, uploads, and live updates.

In plain words
What is it for?
Use it for API-backed screens, sign-in flows, create/read/update/delete features, file uploads, background processing, or real-time updates.
Why use it?
It keeps the backend and frontend parts of one feature aligned, including their data contracts and security checks.

Skill for Claude CodeCodex

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 skills/qinghaoliqaq/autocoder/fullstack_dev
Any agent
npx skills add qinghaoliqaq/AutoCoder --skill fullstack_dev
Clone the repo
git clone --depth 1 https://github.com/qinghaoliqaq/AutoCoder

Made for: Claude Code, Codex.

Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 547 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 $0.00044 $0.00547
Opus 5 $0.00022 $0.00273
Sonnet 5 $0.00009 $0.00109
Haiku 4.5 $0.00004 $0.00055

Measured 2d ago against content hash c531a34db2a8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fullstack-dev 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.

src-tauri/src/bundled_skills/fullstack_dev/SKILL.md · 70 lines

How it starts

The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fullstack Dev

This skill is a compact execution guide for API-backed feature work.

When To Use

Use this skill when the current subtask requires both sides of the system:

  • adding or updating an API endpoint and the UI that consumes it
  • implementing authentication, authorization, or session-dependent features
  • shipping CRUD flows that span schema, handlers, client calls, and UI states
  • wiring file upload, background processing, or realtime updates into the product

Core Rules

  1. Read the existing code paths end to end before editing.
  2. Keep the scope anchored to the current subtask; do not expand into a full rewrite.
  3. Prefer existing architectural patterns over introducing a second style.
  4. Make backend and frontend contracts explicit in code, not implied in prose.
  5. If a migration, config change, or dependency is required, apply the minimal robust change.

Backend Standards

  • Validate input at the boundary.
  • Return consistent success and error shapes.
  • Do not hide failures with overly broad catch blocks.
  • Keep business logic out of transport-layer glue where the project already separates them.
  • Preserve auth and permission checks on every protected path.

Frontend Standards

  • Reflect backend validation and auth states in the UI.
  • Handle loading, empty, success, and error states explicitly.
  • Do not assume stale cached data is correct after a write; refresh or reconcile it.
  • Keep form state, optimistic updates, and retries understandable and bounded.

Integration Checklist

  • Confirm route or handler registration.
  • Confirm request payload and response shape.
  • Confirm the client call site and state update path.
  • Confirm in-scope permission behavior.
  • Confirm not-found, invalid-input, and duplicate/conflict behavior where relevant.

Review Bar

The subtask is only ready for review when:

  • the feature works across the backend/frontend boundary
  • validation and error handling are present on both sides where needed
  • auth and access control remain correct
  • the implementation is integrated into the actual user flow, not left orphaned
  • touched files are limited to what the subtask really needs

Read the full file on GitHub · 70 lines

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. 2d ago First seen · 70 lines · 44 tokens per session scan A c531a34db2a8

Subscribe to this mod's changes

fullstack-dev is a skill published in the GitHub repository qinghaoliqaq/AutoCoder (11 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 44 tokens to every session and 547 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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