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Custom Agent Runner Images

The default runner image is:

ghcr.io/agenta-ai/agenta-sandbox-agent:latest

Build a custom image when you need extra system packages, custom certificates, or a pinned runner build.

Build​

From the repository root:

docker build \
  -f services/agent/docker/Dockerfile \
  -t ghcr.io/<org>/agenta-sandbox-agent:<tag> \
  services/agent

The published image does not bundle Claude Code. If a harness needs Claude Code, the runner installs it from Anthropic at runtime.

Configure Compose​

AGENTA_SANDBOX_AGENT_IMAGE_NAME=<org>/agenta-sandbox-agent
AGENTA_SANDBOX_AGENT_IMAGE_TAG=<tag>

Configure Helm​

agentRunner:
  image:
    repository: ghcr.io/<org>/agenta-sandbox-agent
    tag: <tag>

Configure Railway​

export AGENTA_SANDBOX_AGENT_IMAGE="ghcr.io/<org>/agenta-sandbox-agent:<tag>"

Then run the normal Railway deploy flow.