fec-smell

fec-smell is a command for Claude Code from bovinphang/frontend-craft. It costs 21 tokens per session (192 once invoked), scanned A, original, MIT.

A diagnosis-only command for finding maintainability problems in frontend code, often called code smells. It reports evidence, possible causes, confidence, and candidate refactorings without changing business code.

In plain words
What is it for?
Use it to inspect duplication, responsibilities, dependencies, data flow, or control flow before deciding whether to refactor.
Why use it?
It separates investigation from implementation and requires false-positive checks, so a metric or pattern alone is not treated as proof of a problem.

Command for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the frontend-craft plugin — 56 skills, 11 commands, 14 agents, 5 hooks, 6 MCP servers shipped together

Good fit Use it to inspect duplication, responsibilities, dependencies, data flow, or control flow before deciding whether to refactor.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/bovinphang/frontend-craft/fec-smell
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.

Clone the repo
git clone --depth 1 https://github.com/bovinphang/frontend-craft

Made for: Claude Code.

Or install frontend-craft, the plugin that ships this one along with the rest of its 56 skills, 11 commands, 14 agents, 5 hooks, 6 MCP servers.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for fec-smell

README.md
[![agentmods](https://agentmods.dev/badge/commands/bovinphang/frontend-craft/fec-smell/github.svg)](https://agentmods.dev/commands/bovinphang/frontend-craft/fec-smell)
Your own site
<a href="https://agentmods.dev/commands/bovinphang/frontend-craft/fec-smell"><img src="https://agentmods.dev/badge/commands/bovinphang/frontend-craft/fec-smell/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for fec-smell

Your own site · 80×15
<a href="https://agentmods.dev/commands/bovinphang/frontend-craft/fec-smell"><img src="https://agentmods.dev/badge/commands/bovinphang/frontend-craft/fec-smell.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 21 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 192 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00021 $0.00192
Opus 5 $0.00010 $0.00096
Sonnet 5 $0.00004 $0.00038
Haiku 4.5 $0.00002 $0.00019

Measured 5d ago against content hash 775d68eba0f9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

fec-smell 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 5d 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.

commands/fec-smell.md · 18 lines

What it actually says

Use this command for DIAGNOSE ONLY analysis. Do not modify business code.

Workflow

  1. Discover the requested scope, project/framework facts, and current diff.
  2. Collect concrete evidence about ownership, duplication, change coupling, data flow, control flow, and public boundaries.
  3. Match evidence against the 24-smell catalog and run false-positive checks.
  4. For each finding report: Location, Evidence, Impact, Smell, Confidence, Candidates, Priority, and False-positive check.
  5. LOW-confidence findings remain open questions and must not become automatic edits.
  6. Save the result to reports/refactoring/smell-YYYY-MM-DD-HHmmss.md.

Metrics such as LOC or complexity may focus investigation but are not sufficient proof by themselves.

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. 5d ago First seen · 18 lines · 21 tokens per session scan A 775d68eba0f9

Subscribe to this mod's changes

fec-smell is a command published in the GitHub repository bovinphang/frontend-craft (21 stars, last pushed 8d ago), licensed MIT. It adds 21 tokens to every session and 192 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 2026-09-03.