Subagent

Polyglot Test Implementer

Q: Is Polyglot Test Implementer safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

Implements a single phase from the test plan. Writes test files and verifies they compile and pass. Calls builder, tester, and fixer…

Type: Subagent
Repository: github/awesome-copilot
GitHub stars: 39.4k
License: MIT
Repo last updated: Sep 27, 2026
Source file: README.md

What Polyglot Test Implementer is

Polyglot Test Implementer is a subagent published in the github/awesome-copilot repository on GitHub, which has about 39.4k stars. The repository describes itself as: “Community-contributed instructions, agents, skills, and configurations to help you make the most of GitHub Copilot.”

A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.

Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Polyglot Test Implementer and get back a compact result.

How to install Polyglot Test Implementer

Claude Code

Download README.md from the repository.
Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Claude Cowork

Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from README.md, shared under the repository's MIT license. Read the full file on GitHub.

A community-created collection of custom agents, instructions, skills, hooks, workflows, and plugins to supercharge your GitHub Copilot experience.

> [!TIP] > Explore the full collection on the website → awesome-copilot.github.com > > The website offers full-text search and filtering across hundreds of resources, plus the Learning Hub for guides and tutorials. > > Using this collection in an AI agent? A machine-readable llms.txt is available with structured listings of all agents, instructions, and skills.

📖 Learning Hub

New to GitHub Copilot customization? The Learning Hub on the website offers curated articles, walkthroughs, and reference material — covering everything from core concepts like agents, skills, and instructions to hands-on guides for hooks, agentic workflows, MCP servers, and the Copilot coding agent.

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What's in this repo

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Install a Plugin

For most users, the Awesome Copilot marketplace is already registered in the Copilot CLI/VS Code, so you can install a plugin directly:

copilot plugin install <plugin-name>@awesome-copilot

If you are using an older Copilot CLI version or a custom setup and see an error that the marketplace is unknown, register it once and then install:

copilot plugin marketplace add github/awesome-copilot
copilot plugin install <plugin-name>@awesome-copilot

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Contributing

See CONTRIBUTING.md · AGENTS.md for AI agent guidance · Security · Code of Conduct

> The customizations here are sourced from third-party developers. Please inspect any agent and its documentation before installing.

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Contributors ✨

Thanks goes to these wonderful people (emoji key):

Aaron Powell Matt Soucoup Troy Simeon Taylor Abbas Peter Strömberg Daniel Scott-Raynsford John Haugabook Pavel Simsa Harald Kirschner Muhammad Ubaid Raza Tom Meschter Aung Myo Kyaw JasonYeMSFT Jon Corbin troytaylor-msft Emerson Delatorre Burke Holland Kent Yao Daniel Meppiel Gordon Lam Mads Kristensen Shinji Takenaka spectatora Yohan Lasorsa Vamshi Verma James Montemagno Alessandro Fragnani Ambily krushideep devopsfan Tugdual Grall Oren Me Mike Rousos Justin Yoo Guilherme do Amaral Alves Griffin Ashe Ashley Childress Adrien Clerbois ANGELELLI David Mark Davis Matt Vevang Maximilian Irro NULLchimp Peter Karda Saul Dolgin Shubham Gaikwad Theo van Kraay Tianqi Zhang Will 保哥 Yuta Matsumura anschnapp hizahizi-hizumi 黃健旻 Vincent Huang Bruno Borges Steve Magne Shane Neuville André Silva Allen Greaves Amelia Payne BBoyBen Brooke Hamilton Christopher Harrison Dan Dan Wahlin Debbie O'Brien Ed Harrod Genevieve Warren Guillaume Henrique Nunes Jeremiah Snee Kartik Dhiman Kristiyan Velkov msalaman Per Søderlind Peter Smulovics Ravish Rathod Rick Smit Rob Simpson Robert Altman Salih Sebastian Gräf Sebastien DEGODEZ Sergiy Smyrnov SomeSolutionsArchitect Stu Mace Søren Trudsø Mahon Tj Vita Peli de Halleux Paulo Morgado Paul Crane Pamela Fox Oskar Thornblad Nischay Sharma Nikolay Marinov Nik Sachdeva Nick Taylor Nick Brady Nathan Stanford Sr Máté Barabás Mike Parker Mike Kistler Giovanni de Almeida Martins 이상현 Ankur Sharma Wendy Breiding voidfnc shane lee sdanzo-hrb sauran samqbush pareenaverma oleksiyyurchyna oceans-of-time kshashank57 Meii factory-davidgu dangelov-qa BenoitMaucotel benjisho-aidome Yuki Omoto Will Schultz Waren Gonzaga Vincent Koc Victor Williams Ve Sharma Vasileios Lahanas Udaya Veeramreddygari Tài Lê Tsubasa Ogawa Troy Witthoeft (glsauto) Gerald Versluis George Dernikos Gautam Furkan Enes Florian Mücke Felix Arjuna Eldrick Wega Dobri Danchev Diego Gamboa Derek Clair David Ortinau Daniel Abbatt CypherHK Craig Bekker Christophe Peugnet Christian Lechner Chris Harris Artem Saveliev Antoine Rey Ankit Das Aline Ávila Alexander Martinkevich Aleksandar Dunchev Alan Sprecacenere Akash Kumar Shaw Abdi Daud AIAlchemyForge 4regab Miguel P Z Michael Fairchild Michael A. Volz (Flynn) Michael Mehmet Ali EROL Max Prilutskiy Matteo Bianchi Mark Noble Manish Jayaswal Luke Murray Louella Creemers Sai Koumudi Kaluvakolanu Kenny White KaloyanGenev Kim Skov Rasmussen Julien Dubois José Antonio Garrido Joseph Gonzales Jorge Balderas John Papa John Joe Watkins Jan de Vries Jakub Jareš Jackson Miller Ioana A Hunter Hogan Hashim Warren Gonzalo Gisela Torres Shibi Ramachandran lupritz Héctor Benedicte Ted Vilutis Anthony Shaw Chris McKee CASTResearchLabs 白水淳 Imran Siddique 共产主义接班人 Ivan Charapanau Tadas Labudis Alvin Ashcraft Jan Krivanek Gregg Cochran Josh N ian zhang Garrett Siegel Roberto Perez Dan Velton Lee Reilly Daniel Coelho Vahid Faraji Ashley Wolf Noah Jenkins Jeremy Kohn Harri Sipola Toru Makabe Pham Tien Thuan Phat Benji Shohet Amaury Levé Tim Deschryver Mohammad Asad Alahmadi fondoger Yuval Avidani Csaba Iváncza Tim Heuer lance2k Andrea Liliana Griffiths Ajith Raghavan Catherine Han Igor Shishkin Burrito Verde Joseph Van der Wee Luiz Bon Sanjay Ramassery Babu Russ Rimmerman [MSFT] Roberto Perez Shehab Sherif Smit Patel Steven Vore Subhashis Bhowmik Tim Mulholland Niels Laute Pavel Sulimau PrimedPaul Zhiqi Pu Ramyashree Shetty ZdaPhp pigd0g <td align="center" valign="top" width="14.

Before you install

Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
Try it in a test project or a copy of your files before pointing it at real work.
Pin the version you tested, and review changes before updating.
Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is Polyglot Test Implementer?

Polyglot Test Implementer is a subagent for Claude Code and Claude Cowork from the github/awesome-copilot repository on GitHub. Implements a single phase from the test plan. Writes test files and verifies they compile and pass. Calls builder, tester, and fixer…

How do I install Polyglot Test Implementer in Claude Code?

Download README.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Can I use Polyglot Test Implementer in Claude Cowork?

Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

Is Polyglot Test Implementer safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under MIT. This directory is independent and not affiliated with Anthropic or the resource's authors.