# Code Review — Step 3: `get_activities.go` cleanups

## Verdict

APPROVE

## Findings

No blocking findings.

The Step 3 implementation is narrowly scoped and preserves behavior:

- `activitiesTokenArgs` preserves the exact JSON tags and pointer fields from the previous anonymous struct, so pagination-token validation can still distinguish omitted fields from supplied zero values.
- The `stringSet` helper was removed from `internal/tools`; its former call sites were replaced locally without introducing a new helper abstraction.
- `activitiesAfterCursor` and `shapeActivityStreams` still use map membership for the same requested/skip semantics, and `advanceCursorPast` uses `slices.Contains` for the same duplicate-ID check.
- The cross-file `get_activity_streams.go` edit is justified because it was a package-local caller of the helper being deleted.

## Verification

- Reviewed `git diff ad6f69cc1ddde151ad272306d9077fda4fe5a6c4..HEAD --name-only` and the full diff.
- Read the task prompt, status, and changed tool files for context.
- `go test ./internal/tools` passes.
- `git diff --check ad6f69cc1ddde151ad272306d9077fda4fe5a6c4..HEAD` passes.
- `go test ./...` passes.
- `grep -rn "stringSet" internal/tools/` returns no hits.
