- shell-env: detect Git Bash via MSYSTEM env var when SHELL is unset (#3366)
On some Git Bash installations SHELL is not set but MSYSTEM (MINGW64/MSYS)
is always present. Check MSYSTEM before PSModulePath to avoid emitting
PowerShell syntax in bash shells.
- session-state: resolve legacy agent names in resolveRegisteredAgentName (#3272)
Historical sessions stored agent names like 'Sisyphus (Ultraworker)' which
don't match the current registered format. Fall back to getAgentConfigKey
for legacy/parenthesized name resolution before returning the raw name.
- config-migration: skip backup when file content is unchanged (#3222)
Compare serialized config with existing file content before creating a
timestamped .bak file. Only create backup when the on-disk content
actually differs from the migrated content.
Addresses Cubic review: configs without prior _migrations now get the
full migration set written to config as fallback when sidecar write
fails, preventing migration tracking loss.
Users who auto-migrated from `openai/gpt-5.3-codex` to `openai/gpt-5.4`
and then reverted their config back to `gpt-5.3-codex` by hand had the
migration re-apply on every startup in an infinite loop. Discord bug
report pointed at the exact symptom: "i deleted the migrations and they
kept coming back".
The old migration tracking lived on the config body itself as a
`_migrations` string array. The skip-already-applied check relied on
the user not touching that field. But users hit by the unwanted
migration naturally reached for the JSON file to roll their model back,
and the natural human reaction to an incomprehensible internal field
next to their config is to delete it. That wiped the migration memory
and let the same migration re-apply at the next startup.
This PR introduces a sidecar state file that lives next to the config
as `<configPath>.migrations.json` and tracks applied migrations
outside the user's hand-editable config body. The migration pipeline:
1. Reads applied migrations from BOTH the sidecar AND the legacy
in-config `_migrations` field, unioning them. This keeps old
configs that still carry `_migrations` working without forcing
a reset.
2. Writes the updated migration set to the sidecar, never to the
config body.
3. Strips the legacy `_migrations` field out of the config body on
the first write after the sidecar takes over. Users stop seeing
the mystery internal field in their own config from that point
forward.
If the user also deletes the sidecar (explicit fresh-start gesture)
the migrations run again - that is intentional.
Tests (TDD, all new tests written before implementation):
- src/shared/migration/migrations-sidecar.test.ts - 11 unit tests
covering read/write/round-trip, malformed-payload resilience,
parent-directory creation, sorted output for stable diffs, and
non-string entry filtering.
- src/shared/migration.test.ts - 6 new integration tests under the
"migrateConfigFile with migration tracking via sidecar" block
covering: no-op path, sidecar-only write, sidecar skip after user
revert, legacy _migrations mirroring + strip, sidecar + legacy
union with dedupe, and partial-history append. Existing
"preserves existing _migrations and appends new ones" test was
rewritten to assert the new sidecar-based contract.
- Also fixes a latent test-hygiene bug: the shared
/tmp/nonexistent-path-for-test.json config path used by many
migrateConfigFile tests did not clean up its companion sidecar
between tests, letting state from one test bleed into the next.
Added afterEach that unlinks the sidecar.
Verified:
- bun test src/shared/migration/ -> 11 new sidecar tests pass
- bun test src/shared/migration.test.ts -> 82 pass, 0 fail
- bun run typecheck -> clean
- bun run script/run-ci-tests.ts -> 4458 pass, 0 fail (full suite)
Move hashline_edit out of experimental so it is a stable top-level config with default-on runtime behavior and explicit disable support. Add migration and tests to preserve existing experimental.hashline_edit users without breaking configs.
Migration changes were only applied to rawConfig if file write succeeded,
leaving the running process on stale config. Also stops logging backup
path when the backup copy itself failed.
Previously, migrateConfigFile() mutated rawConfig directly. If the file
write failed (e.g. read-only file, permissions), the in-memory config was
already changed to the migrated values, causing the plugin to use migrated
models even though the user's file was untouched. On the next run, the
migration would fire again since _migrations was never persisted.
Now all mutations happen on a structuredClone copy. The original rawConfig
is only updated after the file write succeeds. If the write fails,
rawConfig stays untouched and the function returns false.
YeonGyu-Kim