---
sidebar_position: 9
title: "Tools Runtime"
description: "Runtime behavior of the tool registry, toolsets, dispatch, and terminal environments"
---

# Tools Runtime

Hermes tools are self-registering functions grouped into toolsets and executed through a central registry/dispatch system.

Primary files:

- `tools/registry.py`
- `model_tools.py`
- `toolsets.py`
- `tools/terminal_tool.py`
- `tools/environments/*`

## Tool registration model

Each tool module calls `registry.register(...)` at import time.

`model_tools.py` is responsible for importing/discovering tool modules and building the schema list used by the model.

## Toolset resolution

Toolsets are named bundles of tools. Hermes resolves them through:

- explicit enabled/disabled toolset lists
- platform presets (`hermes-cli`, `hermes-telegram`, etc.)
- dynamic MCP toolsets
- curated special-purpose sets like `hermes-acp`

## Dispatch

At runtime, tools are dispatched through the central registry, with agent-loop exceptions for some agent-level tools such as memory/todo/session-search handling.

## Terminal/runtime environments

The terminal system supports multiple backends:

- local
- docker
- ssh
- singularity
- modal
- daytona

It also supports:

- per-task cwd overrides
- background process management
- PTY mode
- approval callbacks for dangerous commands

## Concurrency

Tool calls may execute sequentially or concurrently depending on the tool mix and interaction requirements.

## Related docs

- [Toolsets Reference](../reference/toolsets-reference.md)
- [Built-in Tools Reference](../reference/tools-reference.md)
- [Agent Loop Internals](./agent-loop.md)
- [ACP Internals](./acp-internals.md)