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Open source for Hermes Agent

Hermes plugins and skills by MadeByBrain

Tools that grew out of working with Hermes every day. Each one solves a specific problem, is open on GitHub and installs with one command.

Browse plugins MadeByBrain on GitHub ↗
  • Free, MIT license
  • Source code open on GitHub
  • Official Hermes interfaces only

In short

Hermes Agent is an open source AI agent by Nous Research. Plugins extend it through official interfaces without touching the core. Skills are instructions that Hermes loads by itself when a task calls for them.

chat-length banner: a speech bubble as a fill gauge with 70 and 90 percent marks

Installation

$ hermes plugins install chat-length --enable$ hermes gateway restart

Requires: Hermes Agent v0.21.6+

New Plugin v1.1.0 · Free · MIT

chat-length

Knows when a fresh chat is the better move.

In the official plugin catalog ↗

When a chat gets too long, Hermes adds a short notice below its answer. It contains a ready-made opener for a new chat. In the new chat, Hermes pulls the rest from the old conversation on its own.

What it does

  • Measures how full the chat is from the real token counts your AI provider reports back. No guessing.
  • Speaks up at 70 and at 90 percent (configurable), each level only once per chat.
  • Hands you an opener with title, session ID, two or three status bullets and the open items. In the new chat, Hermes finds the history itself via session_search.

Who it is for

For anyone who runs long working chats in Hermes Agent and is done writing handover documents.

View on GitHub ↗ Read the article on the problem
How it works

Measured against compaction

Hermes compacts long chats automatically. By default chat-length therefore measures against that point, not against the full context window. Set basis: window to use the full window instead.

Prompt caching stays intact

The notice reaches the user message only on the turn that triggers it, never the system prompt. Verified with request dumps: every earlier message stays byte-identical.

Configurable

Thresholds, basis and language (auto, English or German) in config.yaml or in Hermes Desktop under Settings, Plugins. Background jobs such as cron, subagents and Kanban never get a notice.

Data and privacy

No network calls, no chat content stored. One small entry per chat with token counts, model and the level that fired, removed after 30 days.

Test status

Live-tested with the Hermes CLI on v0.21.6 and v0.22.2, plus 22 offline tests. The plugin runs server-side, so it is built for WebUI, Desktop and Telegram too. We have not live-tested it there yet.

View in the catalog ↗

Why we build plugins

We run Hermes every day, as our own system and for clients. When something is missing, we build it so it helps others too, and we publish it. The bigger picture behind it is B.R.A.I.N., our personal AI system for business owners.

See B.R.A.I.N. →

Frequently asked questions about the Hermes plugins

What is a Hermes plugin?
A plugin extends Hermes Agent, the open source AI agent by Nous Research. It hooks in through official interfaces and does not change the Hermes core. You install it with hermes plugins install.
How do I install chat-length?
Run hermes plugins install chat-length --enable, then hermes gateway restart (or restart your WebUI or Desktop backend). It requires Hermes Agent v0.21.6 or newer.
What do the plugins cost?
Every plugin on this page is free and MIT licensed. If paid packages are added later, they will be listed separately with a price.
Does chat-length work in WebUI, Desktop and Telegram?
The plugin runs server-side inside Hermes, so it is built for every surface. So far we have live-tested it in the CLI on Hermes v0.21.6 and v0.22.2. WebUI, Desktop and Telegram are next.
Is chat-length in the official Hermes plugin catalog?
Yes. Since 23 October 2026 chat-length has been in the official Hermes Agent plugin catalog. Nous Research reviewed and accepted the entry. Find it with hermes plugins search chat-length or on its catalog page at hermes-agent.nousresearch.com/docs/plugins/chat-length.
Does chat-length store my chats?
No. Per chat it only stores token counts, the model and which level fired, and it deletes these entries after 30 days. It makes no network connections.
Do you build custom plugins?
Yes. If your Hermes should do something it cannot do yet, tell us briefly what you need.

Need a plugin of your own for Hermes?

Tell us what your Hermes should be able to do. We will tell you honestly whether a plugin, a skill or a setting is the right way.

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