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msd-core/.changeset/965-json-errors-unexpected-throw.md
Tom Boucher 22bb82e205 fix(#965): emit structured json error for unexpected handler throws under --json-errors (#987)
* fix(#965): emit structured json error for unexpected handler throws under --json-errors

When GSD_JSON_ERRORS=1 / --json-errors is active, an unexpected (non-ExitError) throw
in a handler now emits { ok: false, reason: "sdk_fail_fast", message } to stderr instead
of a raw stack trace. The plain-text behaviour (no json-error mode) is unchanged.

Closes #965

* chore(#965): backfill changeset pr number (987)

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
2026-06-10 10:40:12 -04:00

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---
type: Fixed
pr: 987
---
**`--json-errors` now emits a structured error even when a handler throws unexpectedly** — an unexpected (non-`ExitError`) throw fell through to a raw stack trace on stderr, breaking SDK structured-error parsing. (#965)