OneCAD-Simulation/docs/crash-reports.md

Crash reports, the log file and Report a Bug

Privacy

No crash report, log line or model is uploaded automatically. Crash reports and the log stay on this computer (anonymous usage, if you agreed to share it, never carries them: see privacy.md). The only way they leave it is Help › Report a Bug (or Report It… after a crash), which opens a GitHub issue form in your browser; you read it there and submit it, or not.

Help › Crash Reports… lists every saved report (when, what, how many times), each with Report…, Copy Path and Delete, and Delete All (diagnostics.crash_reports, diagnostics.crash_reports.delete).

What a bug report carries:

Always (you can edit it)	Only with Share my session	Only with Include the model file as well
the version and OS, what happened (the last error by default), for a crash its message, place and backtrace top; your home folder is shown as ~	the commands that built the model (fieldcraft-session.json, replayable with fieldcraft-cli run); they can name your files	the model (model.fieldcraft), which you attach yourself

The form shows exactly what will be filled in before you click Open GitHub Issue. GitHub refuses long new-issue links, so a session that does not fit goes out as a file instead: it is saved to bug-reports/<time>/ in the data folder below and copied to the clipboard, and the issue text says to attach or paste it. The model is always a file you attach.

Where things are

The app's data folder holds recovery/, crashes/, logs/ and bug-reports/:

System	Folder
macOS	~/Library/Application Support/FieldCraft
Linux	~/.local/share/fieldcraft (or $XDG_DATA_HOME/fieldcraft)
Windows	%LOCALAPPDATA%\FieldCraft

Runs driven by automation (--control, or CI set) use fieldcraft-automation/ in the temporary folder instead, so test runs never reach your folders. FIELDCRAFT_CRASH_DIR moves the crash folder, FIELDCRAFT_RECOVERY_DIR the recovery folder. The browser build keeps no crash folder and logs to the browser console.

The log file

logs/fieldcraft.log: one line per record, time LEVEL [pid] target: message. Past 2 MB it becomes fieldcraft.log.1 and a new one starts. Warnings and errors also go to the standard error stream.

Crash reports

crashes/<YYYYMMDD-HHMMSS>-<signature>/:

• report.json ("format": "fieldcraft-crash/1"): kind (command_panic: a command hit an internal error, caught, the model left unchanged; recovered_panic: one caught inside a command; panic: an internal error outside commands; unclean_exit: the app ended without a clean exit — an abort, a stack overflow, a crash in a graphics driver, the process being killed — found at the next start), message, location, thread, backtrace, app, system, command, recent_commands (up to 32), last_activity (the last control request, such as control ui.capture), base, count, first_seen, last_seen, notes
• model.fieldcraft: the model the replay starts from
• replay.json: {"commands": [{command, params}, …]}
• log.txt: the crashed run's lines of the log

The next start after a crash asks "FieldCraft closed unexpectedly": Report It… opens Report a Bug for that report.

For agents

From	List	One report	Replay
Command (MCP execute, control channel, scripts)	diagnostics.crash_reports	diagnostics.crash_report {id}
CLI	fieldcraft-cli crashes [--json]	fieldcraft-cli crashes show <id>	fieldcraft-cli crashes replay <id>

crashes replay opens the report's model, runs its commands (files they write can only go to a scratch folder) and says whether the same internal error happens again. crashes dir prints the folder, crashes clear [<id>] deletes reports. diagnostics.bug_report returns the draft (link, fields, attachments) without opening anything; over the control channel ui.start diagnostics.bug_report opens the form, ui.prompt {"answer": "set", …} sets its fields, and ui.inspect shows the draft. Only a click opens the browser.

Check that reporting works: with FIELDCRAFT_CRASH_TEST=1, diagnostics.crash_test {mode} crashes on purpose: panic, recovered or abort (reported at the next start).

How it stays cheap and small

The app keeps a journal of the window's top-level commands (crashes/sessions/*.jsonl, at most 512 KB, two small writes per command that changes the model, none for commands that only read), restarted from each autosave and each model opened. A clean exit deletes it; it is locked while its app runs, so a journal nobody holds belongs to an app that died. A crash is identified by its place and message, numbers ignored: repeats only raise count. At most 5 new reports per run, 20 reports, 100 MB, 90 days; a model over 20 MB is not copied. Tests, the CLI and the browser build never install the hook.

Adapted from SolidCraft's crash reports (MIT OR Apache-2.0, see ATTRIBUTION.md).