Docker Container Sandbox

ID	docker_container
Category	Sandboxes
Features	None
Dependencies	None

Run commands and manage files in a Docker container tied to the session. The container is lazily started on first use and persists for the session duration. A self-hosted alternative to cloud sandbox providers like Daytona or E2B.

Experimental: This capability may change significantly in future releases.

Tools

docker_exec

Execute a command inside the Docker container.

Parameter	Type	Required	Description
command	string	yes	Shell command to run
cwd	string	no	Working directory
timeout_ms	integer	no	Timeout in milliseconds

Returns stdout, stderr, and exit code. Container is started automatically if not already running.

docker_read_file

Read a text file from the container filesystem.

Parameter	Type	Required	Description
path	string	yes	File path
offset	integer	no	Line offset to start reading from
limit	integer	no	Maximum number of lines to return

docker_write_file

Write a text file into the container filesystem.

Parameter	Type	Required	Description
path	string	yes	File path
content	string	yes	File content

docker_logs

Retrieve recent logs from the Docker container.

Parameter	Type	Required	Description
tail	integer	no	Number of log lines to return

docker_stop

Stop the Docker container for this session.

Configuration

Configure the Docker container via the capability settings:

Setting	Description
image	Docker image to use (e.g. ubuntu:24.04)
env	Environment variables to inject
binds	Host path mounts

Notes

• Only one container runs per session
• The container is stopped when the session ends or docker_stop is called
• Docker Engine must be accessible from the server running Everruns

See Also

• Container Sandbox integration guide — setup and configuration
• Capabilities Overview