Fence

fence

Lightweight sandbox for running commands with filesystem and network restrictions

Runs as fence|macOS, Linux, Windows|github.com

Open form in Otty otty.toml

Command form

ai-draft · 2 tasks · 7 fields

Run a command inside Fence's sandbox, optionally with a template or settings file. Monitor logging is included; config subcommands and import are left out.

Opens the form; the finished command lands at your prompt, unrun

Run in Otty

otty gui fence

Run in sandboxExample values, fixed in this page — nothing here reaches a terminal

Basic

Command and arguments*

string

Template

string

Monitor violations

-m

Advanced

Settings file

file

Debug logging

-d

TasksEach one presets the form for one job

Run a command sandboxed

templatesettingsmonitordebugargs

Run a shell string

templatesettingsmonitordebugshell_command

ParametersOnly these flags are editable in the form

Template

string

--template-tcode

Settings file

path

--settings

Monitor violations

boolean

-m

Debug logging

boolean

-d

Fence log file

path

--fence-log-file

Shell command string

Run this string through a shell (-c). Use instead of the argument list.
string

-c

Command and arguments

string · positional 0 · repeatable

SourcesEvery flag above is checked against these

readme

fence -c "echo hello && ls" fence -d curl https://example.com fence -t code -- claude # Runs Claude Code using `code` template config fence -m npm install fence -m --fence-log-file /tmp/fence.log -- claude Use `fence --settings ./custom.json` to specify a different config. fence config show --template code fence -- claude --dangerously-skip-permissions

manualHEAD 2026-10-27

github.com

Before it fills your prompt, Otty checks the installed fence against its version. A form that does not match your version is not offered.