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msd-core/.changeset/silly-orcas-dance.md
Tom Boucher b38ae41243 fix(#619): resolve gsd-tools via runtime shim in codebase-drift-gate (#645)
* fix(#619): resolve gsd-tools via runtime shim in codebase-drift-gate

The post-execution drift check ran the bare PATH binary
`gsd-tools verify codebase-drift`. On a shim-only install (gsd-tools.cjs
present, `gsd-tools` not on PATH) that exits 127, `2>/dev/null` hides it,
and the `|| echo` fallback marks the gate skipped — so codebase-drift
detection silently never runs. Non-blocking by contract, so nothing
surfaced; it just quietly stopped working.

Resolve gsd-tools through the runtime shim launcher (gsd_run) instead.
The canonical launcher preamble is now defined once in the always-run
drift-check block (the file's first gsd_run block); the conditional
auto-remap block reuses gsd_run from the workflow's shared shell scope,
keeping the file compliant with the single-canonical-preamble parity
invariant (tests/runtime-launcher-parity.test.cjs). This is the same
single-preamble pattern established by discuss-phase (#614). Non-blocking
is preserved for the drift command's internal failures via the unchanged
`|| echo '{"skipped":...}'` fallback.

Scope decision (the issue's open question): workflow step-file bash blocks
share one shell scope, so the preamble is defined once before the first
gsd_run call — matching discuss-phase and enforced by the parity test.

Regression test (bug-619-...): contract assertions (gsd_run not bare
gsd-tools; single preamble in the drift block; fallback intact) plus a
behavioral proof that runs the shipped drift-check block against a
shim-only topology and asserts the shim actually executes where the old
bare-binary form would have skipped. Red→green verified.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore(#619): add changeset for codebase-drift-gate shim fix

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-03 08:08:34 -04:00

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---
type: Fixed
pr: 645
---
**Post-execution codebase-drift detection no longer silently disables itself on shim-only installs** — `codebase-drift-gate` now resolves `gsd-tools` through the runtime shim launcher (`gsd_run`) instead of the bare PATH binary, which exited 127 (hidden by `2>/dev/null`) and marked the gate skipped whenever `gsd-tools` wasn't on `PATH`. The gate remains fully non-blocking.