A task typed on Home can land in another project's repository

[AbirAbbas]

Seen on dev@debffabf6.

What happened

On 2026-09-24, a /task typed directly on Home while Home showed project B opened a conversation attached to project A's still-running engine. The task commit landed in A; B was untouched. The same result occurred on #1410's merge-base. A plain message typed on Home stayed in B. One run also showed could not start the task · the engine did not answer in time despite the task having started elsewhere; that notice was observed once, not independently reproduced.

Replication

Deterministic (no model). None yet: both launches need a conversation with a live engine, which today means a model.

Field (real models). OPENROUTER_API_KEY, deepseek/deepseek-v4-flash, tmux; a few minutes and a few cents.

export CODEAF_HOME=$(mktemp -d) HOME=$(mktemp -d)
A=$(mktemp -d) && git -C "$A" init -q && git -C "$A" commit -q --allow-empty -m init
B=$(mktemp -d) && git -C "$B" init -q && git -C "$B" commit -q --allow-empty -m init

1. cd "$A" && codeaf chat, send any message, then close the window. A's engine stays up.
2. cd "$B" && codeaf chat. Home's seam reads project: with B's folder.
3. On Home, type /task write h0.txt containing h0 and press enter.

Today the conversation opens in A (its meta.json workspace is A) and the commit task: write h0.txt containing h0 lands in A; git -C "$B" log is unchanged. Control: a plain message typed on Home in step 3 opens in B.

Where

internal/tui3/home.go:3396 at dev@debffabf6, homeStart, begins Home submissions; homeStartWithProject at :3406 delegates to target opening. Search /task dispatch through that path and the hosted engine selection.

The fix

Bind the Home draft's project to the new conversation and its engine before dispatching /task. Refuse visibly if that binding cannot be established; never let an existing engine from another project answer it.

Acceptance

• e2e: through codeaf chat in tmux, a Home /task issued while A's engine lives creates and commits only in B; the conversation workspace field names B.
• e2e: a plain Home message still opens in B.
• Unit: the Home task command and plain-message paths resolve the same target project.
• Update the Home/task manual and invalidates.