hermes-agent/website/docs/user-guide/features/tools.md

sidebar_position	title	description
1	Tools & Toolsets	Overview of Hermes Agent's tools — what's available, how toolsets work, and terminal backends

Tools & Toolsets

Tools are functions that extend the agent's capabilities. They're organized into logical toolsets that can be enabled or disabled per platform.

Available Tools

Hermes ships with a broad built-in tool registry covering web search, browser automation, terminal execution, file editing, memory, delegation, RL training, messaging delivery, Home Assistant, and more.

:::note Honcho cross-session memory is available as a memory provider plugin (plugins/memory/honcho/), not as a built-in toolset. See Plugins for installation. :::

High-level categories:

Category	Examples	Description
Web	web_search, web_extract	Search the web and extract page content.
X Search	x_search	Search X (Twitter) posts and threads via xAI's built-in x_search Responses tool — gated on xAI credentials (SuperGrok OAuth or XAI_API_KEY); off by default, opt in via hermes tools → 🐦 X (Twitter) Search.
Terminal & Files	terminal, process, read_file, patch	Execute commands and manipulate files.
Browser	browser_navigate, browser_snapshot, browser_vision	Interactive browser automation with text and vision support.
Media	vision_analyze, image_generate, text_to_speech	Multimodal analysis and generation.
Agent orchestration	todo, clarify, execute_code, delegate_task	Planning, clarification, code execution, and subagent delegation.
Memory & recall	memory, session_search	Persistent memory and session search.
Automation & delivery	cronjob, send_message	Scheduled tasks with create/list/update/pause/resume/run/remove actions, plus outbound messaging delivery.
Integrations	ha_*, MCP server tools, rl_*	Home Assistant, MCP, RL training, and other integrations.

For the authoritative code-derived registry, see Built-in Tools Reference and Toolsets Reference.

:::tip Nous Tool Gateway Paid Nous Portal subscribers can use web search, image generation, TTS, and browser automation through the Tool Gateway — no separate API keys needed. Run hermes model to enable it, or configure individual tools with hermes tools. :::

Using Toolsets

# Use specific toolsets
hermes chat --toolsets "web,terminal"

# See all available tools
hermes tools

# Configure tools per platform (interactive)
hermes tools

Common toolsets include web, search, terminal, file, browser, vision, image_gen, moa, skills, tts, todo, memory, session_search, cronjob, code_execution, delegation, clarify, homeassistant, messaging, spotify, discord, discord_admin, debugging, safe, and rl.

See Toolsets Reference for the full set, including platform presets such as hermes-cli, hermes-telegram, and dynamic MCP toolsets like mcp-<server>.

Terminal Backends

The terminal tool can execute commands in different environments:

Backend	Description	Use Case
local	Run on your machine (default)	Development, trusted tasks
docker	Isolated containers	Security, reproducibility
ssh	Remote server	Sandboxing, keep agent away from its own code
singularity	HPC containers	Cluster computing, rootless
modal	Cloud execution	Serverless, scale
daytona	Cloud sandbox workspace	Persistent remote dev environments
vercel_sandbox	Vercel Sandbox cloud microVM	Cloud execution with snapshot-backed filesystem persistence

Configuration

# In ~/.hermes/config.yaml
terminal:
  backend: local    # or: docker, ssh, singularity, modal, daytona, vercel_sandbox
  cwd: "."          # Working directory
  timeout: 180      # Command timeout in seconds

Docker Backend

terminal:
  backend: docker
  docker_image: python:3.11-slim

One persistent container, shared across the whole process. Hermes starts a single long-lived container on first use (docker run -d ... sleep 2h) and routes every terminal, file, and execute_code call through docker exec into that same container. Working-directory changes, installed packages, environment tweaks, and files written to /workspace all carry over from one tool call to the next, across /new, /reset, and delegate_task subagents, for the lifetime of the Hermes process. The container is stopped and removed on shutdown.

This means the Docker backend behaves like a persistent sandbox VM, not a fresh container per command. If you pip install foo once, it's there for the rest of the session. If you cd /workspace/project, subsequent ls calls see that directory. See Configuration → Docker Backend for the full lifecycle details and the container_persistent flag that controls whether /workspace and /root survive across Hermes restarts.

SSH Backend

Recommended for security — agent can't modify its own code:

terminal:
  backend: ssh

# Set credentials in ~/.hermes/.env
TERMINAL_SSH_HOST=my-server.example.com
TERMINAL_SSH_USER=myuser
TERMINAL_SSH_KEY=~/.ssh/id_rsa

Singularity/Apptainer

# Pre-build SIF for parallel workers
apptainer build ~/python.sif docker://python:3.11-slim

# Configure
hermes config set terminal.backend singularity
hermes config set terminal.singularity_image ~/python.sif

Modal (Serverless Cloud)

uv pip install modal
modal setup
hermes config set terminal.backend modal

Vercel Sandbox

pip install 'hermes-agent[vercel]'
hermes config set terminal.backend vercel_sandbox
hermes config set terminal.vercel_runtime node24

Authenticate with all three of VERCEL_TOKEN, VERCEL_PROJECT_ID, and VERCEL_TEAM_ID. This access-token setup is the supported path for deployments and normal long-running Hermes processes on Render, Railway, Docker, and similar hosts. Supported runtimes are node24, node22, and python3.13; Hermes defaults to /vercel/sandbox as the remote workspace root.

For one-off local development, Hermes also accepts short-lived Vercel OIDC tokens:

VERCEL_OIDC_TOKEN="$(vc project token <project-name>)" hermes chat

From a linked Vercel project directory:

VERCEL_OIDC_TOKEN="$(vc project token)" hermes chat

With container_persistent: true, Hermes uses Vercel snapshots to preserve filesystem state across sandbox recreation for the same task. This can include Hermes-synced credentials, skills, and cache files inside the sandbox. Snapshots do not preserve live processes, PID space, or the same live sandbox identity.

Background terminal commands use Hermes' generic non-local process flow: spawn, poll, wait, log, and kill work through the normal process tool while the sandbox is alive, but Hermes does not provide native Vercel detached-process recovery after cleanup or restart.

Leave container_disk unset or at the shared default 51200; custom disk sizing is unsupported for Vercel Sandbox and will fail diagnostics/backend creation.

Container Resources

Configure CPU, memory, disk, and persistence for all container backends:

terminal:
  backend: docker  # or singularity, modal, daytona, vercel_sandbox
  container_cpu: 1              # CPU cores (default: 1)
  container_memory: 5120        # Memory in MB (default: 5GB)
  container_disk: 51200         # Disk in MB (default: 50GB)
  container_persistent: true    # Persist filesystem across sessions (default: true)

When container_persistent: true, installed packages, files, and config survive across sessions.

Container Security

All container backends run with security hardening:

• Read-only root filesystem (Docker)
• All Linux capabilities dropped
• No privilege escalation
• PID limits (256 processes)
• Full namespace isolation
• Persistent workspace via volumes, not writable root layer

Docker can optionally receive an explicit env allowlist via terminal.docker_forward_env, but forwarded variables are visible to commands inside the container and should be treated as exposed to that session.

Background Process Management

Start background processes and manage them:

terminal(command="pytest -v tests/", background=true)
# Returns: {"session_id": "proc_abc123", "pid": 12345}

# Then manage with the process tool:
process(action="list")       # Show all running processes
process(action="poll", session_id="proc_abc123")   # Check status
process(action="wait", session_id="proc_abc123")   # Block until done
process(action="log", session_id="proc_abc123")    # Full output
process(action="kill", session_id="proc_abc123")   # Terminate
process(action="write", session_id="proc_abc123", data="y")  # Send input

PTY mode (pty=true) enables interactive CLI tools like Codex and Claude Code.

Sudo Support

If a command needs sudo, you'll be prompted for your password (cached for the session). Or set SUDO_PASSWORD in ~/.hermes/.env.

:::warning On messaging platforms, if sudo fails, the output includes a tip to add SUDO_PASSWORD to ~/.hermes/.env. :::