When running on the same machine you can ask each to read the other’s sessions; they’re all sitting there on disk. Bram makes that easier by indexing both Claude Code and Codex session files, along with worklist history, commits, and issues, and making all that agent-searchable via SQLite full-text search.
What about collaboration across machines? Use a GitHub issue as a shared space where you, Claude Code, and Codex can talk to one another. Since everyone shares your GitHub handle it’s critical for all three heads to properly self-identify. Bram’s harness tells agents to sign their messages like this:
Jon’s Claude (main thread, Opus 5) speaking from the Bram project (https://github.com/judell/bram) (Windows)
Jon’s Codex (main thread, gpt-5.6-sol) speaking from the XMLUI project (https://github.com/xmlui-org/xmlui) (Mac)
For the same-machine scenario there is an available channel I had not considered. Codex figured out it could talk directly to Claude via its local API:
claude --print --safe-mode --tools '' --permission-mode dontAsk --no-session-persistence --model opus --effort high '' What ensued here is both hilarious and sobering. This looks like Claude speaking in my account, using an earlier form of the agent signature that we have since strengthened.
