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feat(box): berthd agent-host keeps a structured agent alive, and a log of everything it says - #75
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…g of everything it says `berthd agent-host --dir D -- COMMAND` runs as a tmux session's program and owns the agent's stdin and stdout. Everything that passes between them, streamed partials included, goes into the conversation's own append-only events.jsonl. A unix socket serves "attach from seq N" with nothing missed, plus write and stop. A stop closes stdin, then sends SIGTERM, then kills the whole process tree, including what tools started in sessions of their own. A host started again in the same folder carries the log on. No driver uses it yet; the Claude driver is next (design/structured-agents/plan.md, phase 2). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Phase 2 of
design/structured-agents/plan.md. Nothing uses it yet, so this PR changes no behaviour; the Claude driver (phase 3) is the first user.berthd agent-host --dir D [--socket S] [--cwd W] -- COMMANDruns as the agent's tmux session program:D/events.jsonlis append-only and numbered (seq). It holds agent stdout (JSON kept as-is, other lines as text), what was written to stdin, stderr, andstarted/exitedhost entries. Streamed partials are kept, which the agents' own transcripts lose when killed mid-turn. A line cut short by a crash is dropped on reopen, and a host started again in the same folder carries the numbering on (resume).D/host.socktakes JSON-line calls:attach(from a seq, gap-free between replay and live, ending afterexited; a reader that falls 1024 behind is let go and attaches again),write(one JSON line to stdin, logged first, non-JSON refused) andstop.exitedentry before the host exits.Tests cover the logged exchange, gap-free late attach, the log outliving the host, a second host carrying the log on, killing a setsid child that ignores SIGTERM, a cut-short log line, and a slow reader. I also ran it end to end against real
claude -p --input-format stream-json --output-format stream-json --include-partial-messages(haiku): write, then attach untilresult, then stop, with exit 0 and a 30-entry log.The plan's SQLite conversation index moves to phase 3, which is the first thing with data to put in it.
Checks run:
go vet ./...(plusGOOS=linux), andgo test -racefor./cmd/...and./internal/agenthost(-count=5on the new package).🤖 Generated with Claude Code