de:wasserversorger-discover

Journal entry appended. This run completed the full discovery skill sequence synchronously: two shards researched, merged, verified, and the coverage rebuilt.

Outcome: Processed phase-2a batch 8 (60 singleton municipal units, Rudolstadt→Heide), lifting population coverage from 65.44% to 67.44% (+2.00pp) and municipalities claimed from 6,162 to 6,266. The mandatory post-merge domain-collision check caught and fixed 2 duplicate company mints (Stadtwerke Schaumburg-Lippe, Stadtwerke Heide) before they entered the roster, and correctly left one legitimate parent/subsidiary domain-sharing case (Augsburg/Gersthofen) unmerged per the skill's rule. Phase-2a pool remaining: 756 units / 11.12M people — next run continues from Rees (NRW) downward; full handoff details are in the journal.

Continued phase-2a from the 18:00 run's exact handoff (verified pool: 822 units / 12.62M people, next-up list matched exactly — Rudolstadt down to Heide). resolve_singleton.mjs re-checked and still broken (same TASKDIR/_tasks ENOENT as last run) — skipped the pre-pass again, both subagents researched directly via WebSearch/WebFetch per the skill's "Per municipality" method.

Took the next 60 singleton units by residual_population descending, 24,852 (Rudolstadt) down to 22,002 (Heide). Split 2 SYNCHRONOUS subagents (p2n / p2o, 30 cities each), each launched with run_in_background: false and the exact required line ("You may not use the Agent/Task tool...do not end your turn until output files exist"). Both finished cleanly on the first try — no delegation, no background children — 5th consecutive batch confirming the fix holds. Non- overlapping company_id ranges (3410-3459 / 3460-3509).

All 60 resolved, 0 fully unresolved (1 pending_domain: ZV Wasserversorgung Lußhardt for Waghäusel). 41 new companies initially minted across both shards, 39 after the collision fix (see below); several reused correctly, including 8 catches in p2n alone where the grep-both-names step (municipality name, not just candidate company name — last run's fix) stopped a duplicate mint and pointed at an existing Amt/Verband-level company instead (TAZV Oderaue, AVU AG, MIDEWA, Kreiswerke Grevenbroich, WBV Harburg, Wasserverband Lausitz, ZWA Saalfeld-Rudolstadt, Stadtwerke Husum).

The mandatory post-merge cross-shard domain-collision check (run across both new shards + the base roster.jsonl, before consolidate_roster.mjs, as the skill requires) caught 2 real duplicate mints the subagents' own grep missed, both exact-name collisions where a subagent independently re-researched and re-minted a company that already existed in the base roster under a different id: Stadtwerke Schaumburg-Lippe GmbH (existing wv-de-2202, re-minted as wv-de-3470 for Stadthagen) and Stadtwerke Heide GmbH (existing wv-de-2401, re-minted as wv-de-3481 for Heide). Both fixed by hand before merging: dropped the 2 duplicate roster rows, repointed the link rows to the existing ids (Stadthagen → wv-de-2202, Heide → wv-de-2401), and dropped one harvested Lohe-Rickelshof link under wv-de-3481 that exactly duplicated an existing link already on wv-de-2401 from 2026-08-21. Same shape as last run's Schleswig/Rathenow catch — worth stating plainly: the grep-both-names instruction reduces this failure mode, it does not eliminate it. It's now caught 4 times total (Schleswig, Rathenow, Schaumburg-Lippe, Heide) purely by the mandatory post-merge check, not by the subagents' own diligence.

One collision correctly left as keep-both, not merged: sw-augsburg.de shared between existing wv-de-121 (Stadtwerke Augsburg Holding GmbH, Augsburg city, HRB 18093) and newly-minted wv-de-3432 (Gersthofen's supply, currently delegated to the subsidiary Stadtwerke Augsburg Wasser GmbH, HRB 18091 — a different Handelsregister number, i.e. a different legal entity, per Gersthofen's own city page: "Derzeit wird die Stadt Gersthofen aus technischen Gründen über die Stadtwerke Augsburg versorgt", an explicitly temporary arrangement while Gersthofen's own Wasserwerk is offline). Per the skill's hard rule ("never auto-merge on a domain collision... parent/subsidiary pairs share a domain too"), kept both rows rather than guessing whether they're the same entity — wv-de-121's own notes already flagged its water-operating subsidiary as "not separately verified," so this is exactly the ambiguity that rule exists for.

Ran the Finish sequence: map_roster.mjs (6,838 links total, 6 unmatched — all administrative-unit or Ortsteil names with no direct AGS, no_ags_for_this_name, left as unmatched rather than guessed) → consolidate_roster.mjs (984 distinct companies, up from 945; 6 shard-level duplicates resolved by last-shard-wins, all pre-existing from batches before this one — verified none came from this run's own p2n/p2o shards) → coverage.mjs → build_gv_layer.mjs. Population coverage 65.44% → 67.44% (+2.00pp); municipalities claimed 6,162 → 6,266 (+104 — above the 60 seeded because harvested member-list links from Wasserverband Lausitz, TAZV Oderaue, ZWA Saalfeld-Rudolstadt, ZVO Ostharz and others claimed extra municipalities beyond the 60 targets). Domain-collision check after the fix: down to the same 2 known/accepted hits — emkendorf.de (pre-existing since 2026-08-19) and the new but legitimate keep-both sw-augsburg.de case above.

Other traps re-confirmed: wholesale-vs-retail splits at Impressum level (Kreiswasserwerke Olpe wholesale / Bigge Energie GmbH & Co. KG retail for both Olpe and Attendorn; Harzwasserwerke wholesale / EWA Ronnenberg retail; WAZV Bode-Wipper for Staßfurt and a separate Zweckverband for Burg, in both cases ruled out the city's own energy-only Stadtwerke as NOT the water supplier); one name-collision correctly guarded (Wertheim, Baden-Württemberg vs. Kreuzwertheim, Bayern — different Zweckverbände); one flagged-not-guessed conflict left for a future reconciliation pass rather than picked: Ditfurt now has two candidate suppliers (existing TAZV Vorharz block-claim vs. a new ZVO-via-VG-Vorharz candidate from this batch), recorded as two separate medium-confidence rows.

Phase-2a pool remaining: 756 units / 11.12M people (next up: Rees 21,913, Gauting 21,860, Gardelegen 21,822, Zülpich 21,780, Schwetzingen 21,767, Sonthofen 21,734, Germersheim 21,715, Lindlar 21,615, Wipperfürth 21,604, Osterode am Harz 21,598).

For next run: continue phase-2a from Rees down, same method. Next free company_id range starts at wv-de-3481 (this run used 3412-3436 in p2n, non-contiguous, with 3437-3459 unused/free; and 3460-3480 in p2o after the 2 retirements — don't reuse 3470/3481, minted then retired this run). Keep the explicit "you may not use the Agent/Task tool" line verbatim in every subagent prompt — 5th consecutive clean batch. Keep grepping the existing roster on both municipality name and candidate company name before minting, but treat that as risk-reduction, not a guarantee — the mandatory post-merge domain-collision check is still catching real duplicates every batch and remains the actual safety net; never skip it. resolve_singleton.mjs remains broken (TASKDIR/_tasks ENOENT) — still worth a real fix or removal, not blocking since the direct-research path works.