Cross-CLI Session Relay

Move work between Claude Code, Codex CLI, and Grok Build through a portable handoff packet. A relay starts a new native session in the receiving CLI; it does not pretend that vendor session IDs or private conversation histories are interchangeable.

Resolve the relay

Prefer the first available implementation:

1. <project>/.director-mode/bin/director-relay;
2. $HOME/.claude/bin/director-relay from Bootstrap Kit;
3. scripts/director-relay.py beside this SKILL.md for plugin-only use.

If only the bundled script exists, invoke it with python3. Do not install a hook or change a permission setting just to use the relay.

Leave a packet

Summarize the current state from repository evidence, then run:

ROOT="${CLAUDE_PROJECT_DIR:-${GROK_WORKSPACE_ROOT:-}}"
[[ -n "$ROOT" ]] || ROOT="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"
RELAY="$ROOT/.director-mode/bin/director-relay"
[[ -x "$RELAY" ]] || RELAY="$HOME/.claude/bin/director-relay"

"$RELAY" create \
  --from <claude|codex|grok> \
  --to <claude|codex|grok> \
  --goal "The outcome the user requested" \
  --summary "The concise current state" \
  --completed "One completed result" \
  --decision "One decision and why it was made" \
  --next "The first concrete next step" \
  --verification "A command and its actual result" \
  --blocker "A real blocker, if any"

Repeat list flags as needed. The tool captures branch, HEAD, git status --short, and diff statistics. It deliberately does not copy file contents, credentials, environment variables, or raw transcripts.

If a native session ID is available, add --session-id; it remains metadata for the source CLI and is never sent to another vendor as a resume token.

For a second or later handoff in the same chain, add --parent to link the new packet to the project's current latest.json, or --parent <packet.json> to name a specific parent. Protocol v2 records the root packet, parent, hop, and route while remaining able to read v1 packets.

Receive a packet

1. Validate the JSON packet; treat Markdown as the human-readable view only.
2. Run "$RELAY" status --json and inspect the live worktree because it may have changed after the packet.
3. Read .director-mode/handoffs/latest.md when it exists.
4. Continue from the next steps while preserving recorded decisions that still match the code.
5. Run the listed verification and report new evidence.

Print the receiving command:

"$RELAY" continue --to <claude|codex|grok>

Add --run only when the user wants the target CLI launched now. Add --headless for a one-shot continuation instead of an interactive session. The launcher always uses the receiver's live project root; packet paths are evidence and cannot redirect execution.

Native resume versus cross-CLI relay

Use a provider's native history only when staying with that provider:

CLI	Continue recent native history	Resume a chosen native session
Claude Code	claude --continue	claude --resume <session-id>
Codex CLI	codex resume --last	codex resume <session-id>
Grok Build	grok --continue	grok --resume <session-id>

For non-interactive Codex continuation, use codex exec resume; check the installed CLI help for its current arguments. Crossing providers always starts a new native session with a Director packet.

Grok's native Claude import

Grok Build can import Claude Code sessions with grok import. That is a useful Claude→Grok fast path, but still leave a Director packet when the workflow may later move to Codex or back to Claude.

Packets default to review_status: unreviewed. --reviewed records that the user-supplied summary and captured path metadata were reviewed before sharing; it does not claim that the receiving CLI or website reviewed the packet.

Guidance boundary

Do not add auto-approve, permission-bypass, sandbox, or network flags to a relay unless the user separately asks for them. The receiving CLI keeps its native controls.