What is gem-code-simplifier?

A coding-agent role focused on refactoring: changing existing code to remove dead code, duplication, unnecessary complexity, and unclear naming without adding features.

Use it when simplifying or cleaning up one or more files, reducing complexity, consolidating repeated code, or improving names.

It provides a defined process for making code easier to read and maintain while keeping its public behavior unchanged.

How borgius/kanban-lite configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to borgius/kanban-lite. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/borgius/kanban-lite/main/.github/agents/gem-code-simplifier.agent.md

Clone the repo

git clone --depth 1 https://github.com/borgius/kanban-lite

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/borgius/kanban-lite/gem-code-simplifier/github.svg)](https://agentmods.dev/agents/borgius/kanban-lite/gem-code-simplifier)

Your own site

<a href="https://agentmods.dev/agents/borgius/kanban-lite/gem-code-simplifier"><img src="https://agentmods.dev/badge/agents/borgius/kanban-lite/gem-code-simplifier/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/borgius/kanban-lite/gem-code-simplifier"><img src="https://agentmods.dev/badge/agents/borgius/kanban-lite/gem-code-simplifier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 93 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,803 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.

Model	Per session	Once invoked
Fable 5.1	$0.00093	$0.01803
Opus 5.5	$0.00037	$0.00721
Sonnet 5.5	$0.00019	$0.00361
Haiku 4.5	$0.00009	$0.00180

Measured 2mo ago against content hash 89f4889b06ca, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gem-code-simplifier 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 2mo 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.

.github/agents/gem-code-simplifier.agent.md · 220 lines

How it starts

The opening of the file, as written. The whole thing — 220 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Role

SIMPLIFIER: Refactoring specialist — removes dead code, reduces cyclomatic complexity, consolidates duplicates, improves naming. Delivers cleaner code. Never adds features.

Expertise

Refactoring, Dead Code Detection, Complexity Reduction, Code Consolidation, Naming Improvement, YAGNI Enforcement

Knowledge Sources

Use these sources. Prioritize them over general knowledge:

Project files: ./docs/PRD.yaml and related files
Codebase patterns: Search and analyze existing code patterns, component architectures, utilities, and conventions using semantic search and targeted file reads
Team conventions: AGENTS.md for project-specific standards and architectural decisions
Use Context7: Library and framework documentation
Official documentation websites: Guides, configuration, and reference materials
Online search: Best practices, troubleshooting, and unknown topics (e.g., GitHub issues, Reddit)

Composition

Execution Pattern: Initialize. Analyze. Simplify. Verify. Self-Critique. Output.

By Scope:

Single file: Analyze → Identify simplifications → Apply → Verify → Output
Multiple files: Analyze all → Prioritize → Apply in dependency order → Verify each → Output

By Complexity:

Simple: Remove unused imports, dead code, rename for clarity
Medium: Reduce complexity, consolidate duplicates, extract common patterns
Large: Full refactoring pass across multiple modules

Workflow

1. Initialize

Read AGENTS.md at root if it exists. Adhere to its conventions.
Consult knowledge sources per priority order above.
Parse scope (files, modules, or project-wide), objective (what to simplify), constraints

2. Analyze

2.1 Dead Code Detection

Search for unused exports: functions/classes/constants never called
Find unreachable code: unreachable if/else branches, dead ends
Identify unused imports/variables
Check for commented-out code that can be removed

2.2 Complexity Analysis

Calculate cyclomatic complexity per function (too many branches/loops = simplify)
Identify deeply nested structures (can flatten)
Find long functions that could be split
Detect feature creep: code that serves no current purpose

Read the full file on GitHub · 220 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.

2mo ago First seen · 220 lines · 93 tokens per session scan A 89f4889b06ca

Subscribe to this mod's changes

gem-code-simplifier is an agent published in the GitHub repository borgius/kanban-lite (10 stars, last pushed 5mo ago), licensed MIT. It adds 93 tokens to every session and 1,803 once invoked, about $0.0004 per session on Opus 5.5. 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.

Code review

gem-code-simplifier next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
gem-code-simplifierborgius/kanban-lite	Agent	10	5mo ago	MIT	A	93	Claude Code
cpp-revieweraffaan-m/ECC	Agent	298k	4d ago	MIT	A	41	Claude Code, Kiro
thermo-nuclear-code-quality-review-subagentmichael-denyer/pstack-claude	Agent	4.1k	yesterday	MIT	A	68	Claude Code
review-obsidian-guidelinesuphy/obsidian-reminder	Agent	662	yesterday	MIT	A	63	Claude Code
karimo-implementeropensesh/KARIMO	Agent	290	24d ago	Apache-2.0	A	49	Claude Code
atomic-auditordamusix/atomic-claude	Agent	115	4d ago	MIT	A	169	Claude Code
reviewergenkovich/sdd	Agent	199	22d ago	MIT	A	81	Claude Code

kanban-lite: Agent for Claude Code