sbx/claude-sbx-statusline-kit:latest

schemaVersion: "2"
kind: mixin
name: claude-sbx-statusline
displayName: Claude Code Status Line
description: Adds a two-line Docker Sandboxes status line to Claude Code (host, cwd, git branch, model, context %, memory, load, cost). Ships ~/.claude/statusline.sh and sets the statusLine key in ~/.claude/settings.json, merging so every other setting is preserved (an existing statusLine is intentionally replaced, since installing this status line is the point of the kit).
requires:
    agent: claude
agentInstructions:
    content: |
        ## Status line

        This sandbox renders a custom Claude Code status line via
        ~/.claude/statusline.sh, registered under `statusLine` in
        ~/.claude/settings.json. It shows the sandbox host, working directory, git
        branch, model, context-window %, memory, load average, and session cost.
setup:
    install:
        - command: |
            set -e
            mkdir -p /home/agent/.claude
            f=/home/agent/.claude/settings.json
            [ -f "$f" ] || echo '{}' > "$f"
            # Set only the statusLine key (any existing one is replaced by design);
            # the jq merge leaves all other settings untouched. Temp file lives in the
            # same dir as $f so the mv below is an atomic rename, not a cross-fs copy.
            tmp=$(mktemp -p /home/agent/.claude)
            jq '.statusLine = {type: "command", command: "~/.claude/statusline.sh"}' "$f" > "$tmp"
            mv "$tmp" "$f"
            # Shipped files arrive 0644; unexecutable, it renders nothing and no error.
            chmod +x /home/agent/.claude/statusline.sh
            # Enumerated, not recursive: ~/.claude holds runtime-managed content
            # this kit doesn't own, so `chown -R` on the parent would take
            # ownership of paths outside the kit's control.
            chown agent:agent /home/agent/.claude "$f" /home/agent/.claude/statusline.sh
          user: "0"
          description: Set the statusLine key in ~/.claude/settings.json to ~/.claude/statusline.sh (jq merge, so all other keys are preserved; any existing statusLine is replaced by design) and make the script executable