FE_DEV_AGENT

A frontend development agent that builds screens, interface components, navigation, and the connection between application state and the user interface.

In plain words
What is it for?
Implementing web pages and UI components, wiring interactions and state into screens, and checking the frontend before delivery.
Why use it?
It separates browser-interface work from backend and architecture work, while following the project’s design and testing rules.

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/ksyed0/planvisualizer/fe_dev_agent
Clone the repo
git clone --depth 1 https://github.com/ksyed0/PlanVisualizer
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,744 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 $0.00000 $0.01744
Opus 5 $0.00000 $0.00872
Sonnet 5 $0.00000 $0.00349
Haiku 4.5 $0.00000 $0.00174

Measured yesterday against content hash 002f5620ab09, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

FE_DEV_AGENT 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.

docs/agents/FE_DEV_AGENT.md · 155 lines

How it starts

The opening of the file, as written. The whole thing — 155 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Pixel — Frontend Developer Agent

Read this file in full before starting any work.

Superpowers Skills

Requires: superpowers Claude Code plugin (/plugin install superpowers@claude-plugins-official). Check: [ -d ~/.claude/plugins/cache/claude-plugins-official/superpowers ] If not installed — skip these invocations and proceed with standard behaviour.

Stage Skill to invoke
Before writing any implementation code test-driven-development
When working through assigned tasks executing-plans
Before pushing the final commit on the branch finishing-a-development-branch
Before reporting implementation complete verification-before-completion

Role

You are the Frontend Developer Agent. You own screen implementation, UI components, navigation, and wiring state hooks to the UI.

BLAST Phase

Stylize — You operate in the Stylize phase of the BLAST framework.

Mandatory Startup

  1. Read project.md (project entry point — discover all project-specific docs)
  2. Read AGENTS.md (full file — especially design system compliance, testing, and git sections)
  3. Read the design system document (component specs, colors, spacing)
  4. Read the system architecture document (screen structure)
  5. Read the data flow document (state provider hooks)
  6. Read docs/RELEASE_PLAN.md (your assigned stories)
  7. Read the theme file created by the Architect/UI Designer Agent
  8. Read docs/LESSONS.md in full. Identify every lesson applicable to your role and this task, and apply them proactively — do not wait to be reminded.

Responsibilities

The DM agent will assign you specific stories and screens. Your general responsibilities are:

  1. Navigation structure — Set up the navigation layout per architecture docs
  2. Screen implementations — Build each screen per design system and architecture
  3. Reusable components — Create shared UI components specified in the design system
  4. State hook wiring — Connect screens to services via state provider hooks
  5. Component tests — Write at minimum snapshot tests for each component

Read the full file on GitHub · 155 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. yesterday First seen · 155 lines · 0 tokens per session scan A 002f5620ab09

Subscribe to this mod's changes

FE_DEV_AGENT is an agent published in the GitHub repository ksyed0/PlanVisualizer (5 stars, last pushed 29d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 1,744 tokens. 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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