Moss Toolbox
Agent Soul Builder

AI tool

Agent Soul Builder

Give your AI agent a soul, not just a prompt.

Answer a few questions about what your agent is for and who it serves. We assemble the full package - persona, voice, memory seeds, starter skills, boundaries, example interactions - into files you can drop into Claude, Hermes, ChatGPT, or Gemini. Edit everything first. You know your agent better than we do.

How it works

  1. Tell us about the agentWhat is it for? Who does it serve? Pick a vibe or describe the tone in your own words.
  2. We build the soulOne credit. Persona, voice, memory seeds, starter skills, boundaries, and example interactions - assembled from your answers.
  3. Make it yoursEvery field is editable before you save. Fix what is off, keep what sounds right.
  4. Save it to your libraryCome back any time to edit, compare, or export a soul again.
  5. Export itOne click turns a soul into a Claude Skills file, a Hermes skill folder, the Hermes SOUL.md and MEMORY.md files, a ChatGPT custom instructions doc, or a Gemini Gem.

Tell us about the agent

0 / 3500
What voice should it speak in?

This run uses 1 credit

Saving, editing, and exporting cost nothing.

Your souls

No saved souls yet. Build one and it shows up here.

Built with Moss Toolbox. Claude, Hermes, ChatGPT, and Gemini formats are third-party and not affiliated with or endorsed by Anthropic, Nous Research, OpenAI, or Google. Format details can change - exports are verified as of September 11, 2026.

About this tool

What is an agent soul?

A complete identity for an AI agent: who it is, how it talks, what it knows, what it can do, and where it draws the line. Instead of writing a long prompt from scratch, you answer a few questions and get the whole package, ready to edit and export.

Do I need a saved voice profile?

No. If you built one in the Brand Voice Builder it is used as a head start, but you can also paste writing samples or let us shape a fresh voice from your answers.

What costs a credit?

Building a soul costs one credit. Editing, saving, listing, and exporting are free - exports run in your browser.

Which agents does it work with?

Five targets: Claude Skills and Hermes skills (each a SKILL.md file in its own folder), the Hermes SOUL.md and MEMORY.md files, ChatGPT custom instructions, and a Gemini Gem. Every export is plain text, so you can adapt it to any assistant. Custom GPTs need a business workspace now, so the ChatGPT export targets custom instructions instead.

Can I come back and change a soul later?

Yes. Souls save to your library. Load one any time, edit it, and re-export.

Does this run agents for me?

No. This builds the identity files. You drop them into your own agent tools - nothing runs on our servers beyond generating the text.

More tools you can use

Review Response GeneratorPaste a customer review and get three ready-to-post replies written in your tone - calm and professional, even for bad reviews.Brand Voice BuilderPaste a few things you've written and get a reusable profile of your voice - tone, favorite phrases, what to avoid.Content RepurposerPaste one post or newsletter and get Instagram, X, LinkedIn, and email versions written in your brand voice.

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