A failed run offers "Fix with AI": a chat session that finds the cause and proposes a fix

[endrix]

A failed run used to say only "Workflow run failed (exit code N). See the run output.". It also did not refresh the diagram, so the error marks (#70) waited for something else to redraw it.

Now, when a run fails

• The diagram is refreshed, so the failing node and the nested workflows containing it are marked.
• The notification says where and what: Run failed in x (in m › i): ValueError: deep down. This comes from the run record's error and instance path (runner: a run's error names the failing actor by its path through nested workflows huawei-csl/wfpy#46).
• With a chat behind the diagram, it offers Fix with AI and Show Output.

Fix with AI starts a task in that diagram's chat: a new session in plan mode, named for where it failed (Fix: x (in m › i)). Its first message is the failure:

• the node and the nested workflows it is in, with the instance path;
• the error;
• the end of the run's stderr, i.e. its traceback, kept as the run writes it (appendTail, last 8 KB);
• the run directory;
• when the product can resume runs (cliResumeArgs), a note that the run can be resumed from the failure once fixed.

Plan mode because the person asked for a diagnosis and a proposal, not for files to change under them. They switch to build to apply it. The panel sends the message as if typed, so it appears in the transcript like any other.

Wiring

• The run driver's host gains startChatTask, set only when the profile has a chat.
• It goes to ChatRuntime.startTask, which posts chat.startTask to the panel on that diagram.
• The panel opens, creates the named session in the task's mode, and sends the message once the session exists.
• Without a chat, a failed run is reported and only Show Output is offered.

Tests

• run-failure.test.ts (6): where, headline, stderr tail, prompt contents, and no resume note when the run cannot be resumed.
• cli-run-driver-fix-with-ai.test.ts (3): a failing run with a real run record and traceback; the offer; the plan-mode task with path, traceback and resume note; no offer without a chat.
• chat-panel-start-task.test.ts (3): session created in mode and name, message sent once after creation, and the task dropped if creation is aborted.

All workspaces pass, with neutrality 5/5 and typecheck 5/5.

https://claude.ai/code/session_015VK7fH1c4aKbexnq2QcuKU