Noisegate: plugin for Hermes Agent

Q: How do I install Noisegate?

Run uvx --from noisegate-hermes noisegate install-hermes. The same command handles updates, and adding --dry-run previews the steps without changing anything.

Deterministic compaction of noisy tool output for Hermes Agent, with no model calls

What Noisegate does

Noisegate is a small, deterministic compaction layer for Hermes Agent. It reduces output from pytest and unittest, apt, pip and uv installs, npm, pnpm and yarn, git status and git log, and Docker build and log commands. Anything else long falls back to a deterministic head and tail trim. It does not call a model and does not summarize logs.

It deliberately leaves exact content alone: file reads, patches and diffs, rg and grep output, skill documents, memory, MCP, search and web extraction results, complete strict JSON documents and unknown tools unless explicitly allowed. When unsure, it does nothing. It registers the Hermes hooks transform_terminal_output and transform_tool_result, and it also ships a CLI usable in terminals, scripts and CI. Hermes-LCM remains a separate recovery layer, and lcm_ tool results stay exact. The Python package noisegate-hermes must be installed in the same environment that runs hermes.

Key features

Compacts pytest, package-install, git, Docker and similar noisy output
Never calls a model, so results are deterministic
Leaves file reads, diffs, code search, memory and MCP results exact
Registers the transform_terminal_output and transform_tool_result hooks
noisegate install-hermes installs, enables the plugin and runs noisegate doctor
CLI for terminals, scripts and CI, plus an npm installer wrapper

When to use it

Stop a long test run from filling the context window with passing lines
Trim Docker build and package install logs while keeping the errors
Preview the install steps first with the --dry-run option

Who it is for: Hermes Agent users whose tool output regularly floods the context window.

How it fits with Hermes Agent

It is built as a Hermes Agent plugin that must be installed into the same Python environment as the hermes launcher.

How to install Noisegate

These commands are copied from the project's README. Check the repository for the latest steps before you run them.

uvx --from noisegate-hermes noisegate install-hermes

Requirements: Hermes Agent on PATH, installed in a virtual environment, and uv or uvx for the install command

FAQ

What is Noisegate?

Noisegate is a Hermes Agent plugin and CLI that compacts noisy tool output, such as test logs and build output, using deterministic rules and no model calls.

How do I install Noisegate?

Run uvx --from noisegate-hermes noisegate install-hermes. The same command handles updates, and adding --dry-run previews the steps without changing anything.

Is Noisegate free and open source?

Yes, Noisegate is open source under the MIT license.