Awesome GitHub Copilot is a community collection of custom agents, instructions, skills, hooks, workflows, plugins, and configuration for GitHub Copilot. It helps Copilot users customize coding and development tasks. Catalogue entries are individual Copilot add-ons from this collection.
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.
git clone --depth 1 https://github.com/github/awesome-copilotWrote 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.
[](https://agentmods.dev/agents/github/awesome-copilot/gem-code-simplifier)<a href="https://agentmods.dev/agents/github/awesome-copilot/gem-code-simplifier"><img src="https://agentmods.dev/badge/agents/github/awesome-copilot/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.
<a href="https://agentmods.dev/agents/github/awesome-copilot/gem-code-simplifier"><img src="https://agentmods.dev/badge/agents/github/awesome-copilot/gem-code-simplifier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00021 | $0.00639 |
| Opus 5.5 | $0.00008 | $0.00256 |
| Sonnet 5.5 | $0.00004 | $0.00128 |
| Haiku 4.5 | $0.00002 | $0.00064 |
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 8d 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- gem-code-simplifier — 100% identical, 0 lines differ
- gem-code-simplifier — 88% identical, 0 lines differ
What it actually says
CODE SIMPLIFIER
Remove dead code, reduce complexity, consolidate duplicates, improve naming. Never add features.
<skills_guidelines>
- Smells: Long param lists, feature envy, primitive obsession, magic numbers, god classes.
- Principles: Preserve behavior; small steps; version control; one change at a time.
- Don't refactor: Working code that won't change; critical code without tests (add tests first); code under tight deadlines.
- Operations: Extract Method/Class; Rename; Introduce Parameter Object; Replace Conditional with Polymorphism; Magic Number -> Constant; Decompose Conditional; Guard Clauses.
- Use extraction/rename/pattern only when smell is evidenced and change measurably reduces complexity without expanding public contract.
- Process: Prefer speed over ceremony; YAGNI; bias toward action; proportional depth. </skills_guidelines>
<output_format>
{
"status": "completed | failed | needs_retry | blocked",
"reason": "string",
"fail": "fixable | needs_replan | escalate | flaky | regression | new_failure | platform_specific",
"handoff": {
"changed_files": ["string"],
"complexity_delta": 0,
"verdict": "pass | fail"
},
"learn": "string"
}
</output_format>
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.
- 8d ago Changed · +5 lines a448818e6257
- 1mo ago Changed · -38 lines 2ff5a8b6a65d
- 1mo ago Changed · +10 lines a29a32e2f941
- 1mo ago First seen · 90 lines · 21 tokens per session scan A c76b1e1fad25
gem-code-simplifier is an agent published in the GitHub repository github/awesome-copilot (40,285 stars, last pushed today), licensed MIT. It adds 21 tokens to every session and 639 once invoked, about $0.0001 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 2026-09-03.
Other agents, from other repositories
ndv-design
Design judgment specialist. Use when UI code, components, or flows need visual and UX assessment — or when a design decision needs principled justification. Reads code as its rendered visual output. The broken hierarchy, the absent affordance, the interaction that taxes working memory beyond its limit — these register…
ndv-review
Code review specialist. Use when reviewing PRs, changed files, or any code that needs quality assessment. Sensory processing sensitivity — nothing is filtered as background noise, every inconsistency is fully registered and reported at the correct severity.
vibeflow-architect
Senior software architect and technical PM. Plans features, reviews specs, audits implementations. Does NOT write code.
shadow-auditor
Audits agent decisions and session outcomes for compliance and quality. Assign as a shadow for end-of-session review.
skill-reviewer
Skill quality reviewer for SKILL.md format validation, content assessment, and structural refactoring following the agentskills.io standard.
critic
../../src/claude/agents/critic.md.