wait_for_task_change resolved #<number>/bare-number ids up front via TaskIdResolver, which
throws for an unknown number -- breaking the tool's own documented promise that an unknown
id reports status "NotFound" instead of failing the whole call. Resolve per id and fall back
to the original id on a resolution failure so CheckOnceAsync can still report it.
TaskNumberAllocator.AddWithNumberAsync indexed into the app_settings UPDATE...RETURNING result
without checking for an empty result, throwing on a missing singleton row; it also caught any
DbUpdateException as a number collision, burning up to 5 numbers on an unrelated failure (e.g.
FK violation) before the real error surfaced. Now recreates the missing row and only retries on
the actual unique-index collision (SQLite error 19 on tasks.number), rethrowing everything else
immediately.
Audited the other TaskIdResolver.ResolveAsync/ResolveManyAsync call sites (ExternalMcpService,
HandoffMcpTools, ConfigMcpTools, RunHistoryMcpTools, AttachmentMcpTools, LifecycleMcpTools,
BatchMcpTools): none of their tool descriptions promise a found/NotFound flag for the id itself
(BatchMcpTools.BatchGetTasks already handles this correctly via its own per-id try/catch;
PreviewMergeSet promises a per-task "error" field, not a found/NotFound flag; the rest are
single-id tools that already throw on a missing task downstream) -- left throwing behavior as-is.
TaskEntity.Number is a global, monotonically increasing, never-reused
integer (displayed as #123), allocated from AppSettingsEntity.NextTaskNumber
via a single UPDATE...RETURNING statement rather than MAX(number)+1, which
would reissue a deleted task's number. Both insert paths (TaskRepository.
AddAsync and CreateChildAsync) route through the new TaskNumberAllocator,
with a bounded retry on a unique-index collision. One migration adds the
columns, backfills existing rows in creation order, and creates the unique
index afterwards. Data-layer only; MCP/UI wiring is later slices.
mika kuns