gem-implementer

gem-implementer is an agent for Claude Code from jiamaozheng/awesome-claude-code. It costs 22 tokens per session (1,120 once invoked), scanned A, original, no licence file.

A test-driven development agent that implements features, fixes bugs, and refactors code by writing tests as part of the process.

In plain words
What is it for?
Use it to build features, repair defects, and restructure code with tests guiding the implementation.
Why use it?
TDD, or test-driven development, helps confirm expected behaviour while code is changed and reduces the chance of regressions.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to build features, repair defects, and restructure code with tests guiding the implementation.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/jiamaozheng/awesome-claude-code/gem-implementer
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/jiamaozheng/awesome-claude-code

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.

agentmods badge for gem-implementer

README.md
[![agentmods](https://agentmods.dev/badge/agents/jiamaozheng/awesome-claude-code/gem-implementer/github.svg)](https://agentmods.dev/agents/jiamaozheng/awesome-claude-code/gem-implementer)
Your own site
<a href="https://agentmods.dev/agents/jiamaozheng/awesome-claude-code/gem-implementer"><img src="https://agentmods.dev/badge/agents/jiamaozheng/awesome-claude-code/gem-implementer/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 gem-implementer

Your own site · 80×15
<a href="https://agentmods.dev/agents/jiamaozheng/awesome-claude-code/gem-implementer"><img src="https://agentmods.dev/badge/agents/jiamaozheng/awesome-claude-code/gem-implementer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 22 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,120 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 unknown 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 $0.00022 $0.01120
Opus 5 $0.00011 $0.00560
Sonnet 5 $0.00004 $0.00224
Haiku 4.5 $0.00002 $0.00112

Measured 6d ago against content hash 14974cedf623, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

gem-implementer 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 6d 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.

agents/gem-implementer.md · 114 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 6d ago First seen · 114 lines · 22 tokens per session scan A 14974cedf623

Subscribe to this mod's changes

gem-implementer is an agent published in the GitHub repository jiamaozheng/awesome-claude-code (1 stars, last pushed yesterday), with no licence file. It adds 22 tokens to every session and 1,120 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.

Related

Other agents, from other repositories

quality-playbook

Run a complete quality engineering audit on any codebase. Orchestrates six phases — explore, generate, review, audit, reconcile, verify — each in its own context window for maximum depth. Then runs iteration strategies to find even more bugs. Finds the 35% of real defects that structural code review alone cannot catch.

github/awesome-copilot · 69 tokens

QA

Meticulous QA subagent for test planning, bug hunting, edge-case analysis, and implementation verification.

github/awesome-copilot · 22 tokens

mutation-tester

Mutation testing specialist that measures test suite quality by injecting code mutations. Supports Stryker (JS/TS), mutmut (Python), go-mutesting (Go). Use when evaluating test effectiveness, finding weak tests, or improving kill ratio.

vibeeval/vibecosystem · 52 tokens

qa-implementer

TDD implementation worker. Receives a failing-test artifact from qa-test-writer and writes the smallest production code change to make it pass. Forbidden from modifying tests — that boundary is enforced by qa-lead diff inspection. Half of the adversarial fix pair.

vinnie357/claude-skills · 57 tokens

qa-test-writer

TDD test-author worker. Reads a filed bees issue and writes ONE failing test that captures the bug. Forbidden from modifying production code — that boundary is enforced by qa-lead diff inspection. Half of the adversarial fix pair.

vinnie357/claude-skills · 51 tokens

deep-debugger

Systematic bug recreation, root cause analysis, and TDD-based resolution with skills-based test framework integration.

FortiumPartners/ensemble · 24 tokens