Rendered from docs/probe-runs/second-campaign-pilot-of-2026-09-28-campaign-tier-present-arm-navigability.md in the Headwater corpus. Every document on this half of the site is typed by the taxonomy the descriptor names: corpus.json.

Second campaign pilot of 2026-09-28, campaign tier, present arm, navigability

Run identity

model: claude-sonnet-5
served_version: claude-sonnet-5
tree: sha256:d9aad3464b048f92f47d8c5779bffee5b728699fc710d7e0af2c66363e9b51b0
lock: sha256:62144f6124525b73c49768d80ccdc41d7324fff0b39836367db4db85aa502cb8
selection: sha256:fc04ac718a7df0b14774c28174a93f9d44dea6305b9901ba6e2fe6556834db76
read_set: sha256:00323cb8f153c3f22044099b6eeca18c5787b93cdb0d89262d285b926703ee49
seed: 0
harness: 0.4.0
tier: campaign
arm: present
at: 2026-09-28
cost_cents: 98

This is a second pilot and not the campaign. tools/probe/campaign.sh recorded it on 2026-09-28 at one repetition per probe, to test the three changes the owner ruled on #980 after the first pilot. First, every workspace of both arms carries the built headwater, so the intent hook can run in a present-arm session. Second, a closed-set word alone on the final line is the answer. Third, the seal removes HW-OBL-0198, the answer key of the patched probe. No comparison pools it with the full run, and no obligation is restated on it.

One batch, one tree. Every session ran in a fresh copy of one git archive of commit ed9e61a7, with the engine that commit builds, in one order that seed 981 shuffled, four at a time, on claude-sonnet-5 with a cap of 60 turns. Each workspace lost the instrument, every record under docs/ that names a probe of the batch, and the answer keys of those probes. Each absent workspace also lost its tier's ablation.

This transcript stands at deprecated, and the reason is the lock it pins. The digest above is the lock of the tree that these pilot sessions met. The taxonomy change that declared the subsystem_spec kind on 2026-09-28 moved that lock, and the first of the five confirmations now refuses this recording. The result derived from it carries no verdict on a later tree, and its verdicts stand only in the history of that result. A reader may take no rate from it as a measurement of a tree whose lock differs from the digest above. The full campaign batch records its own sessions.

Events

- probe: "HW-PROBE-an-agent-reaches-the-adjudication-from-the-document-that-lost-it"
  session: "L4-campaign-present-p1-r1"
  calls:
    - tool: "Bash"
      argument: "{\"command\":\"grep -n \\\"Q8\\\" -A 60 \\\"docs/spec/09-open-questions.md\\\" | head -100\"}"
      result: ""
    - tool: "Read"
      argument: "/home/james/probe-batches/980-pilot2-2026-09-28/ws/L4-campaign-present-p1-r1/docs/decisions/0008-probe-cost-and-cadence.md"
      result: "sha256:862eaf8e574ca818108a9defb10a1aa30801297f8e5d704f2eec151b7a627c73"
  produced: []
  answer: null
- probe: "HW-PROBE-a-session-answers-from-the-register-without-opening-the-question-it-replaced"
  session: "L4-campaign-present-p2-r1"
  calls:
    - tool: "Bash"
      argument: "{\"command\":\"grep -ril \\\"scent\\\" --include=\\\"*.md\\\" . | head -50\"}"
      result: ""
    - tool: "Read"
      argument: "/home/james/probe-batches/980-pilot2-2026-09-28/ws/L4-campaign-present-p2-r1/docs/decisions/0020-where-scent-lives.md"
      result: "sha256:9a6c7b0b7893386e7564e2a38a53cfdaacc53303563751be07d094bcf835c39f"
    - tool: "Bash"
      argument: "{\"command\":\"grep -n -i \\\"scent\\\\|cites\\\" docs/spec/02-taxonomy-model.md | head -40\"}"
      result: ""
    - tool: "Read"
      argument: "/home/james/probe-batches/980-pilot2-2026-09-28/ws/L4-campaign-present-p2-r1/docs/spec/02-taxonomy-model.md"
      result: "sha256:d82f2e97d492172a490c375208722d6ca290e1d32c049d54a38cfff019026870"
  produced: []
  answer: null
- probe: "HW-PROBE-what-a-session-writes-points-back-at-the-ruling-it-rests-on"
  session: "L4-campaign-present-p3-r1"
  calls:
    - tool: "ToolSearch"
      argument: "{\"query\":\"select:EnterWorktree\",\"max_results\":1}"
      result: ""
    - tool: "Bash"
      argument: "{\"command\":\"git rev-parse --is-inside-work-tree 2>&1; git status 2>&1 | head -20\",\"description\":\"Check if directory is a git repository\"}"
      result: ""
    - tool: "Bash"
      argument: "{\"command\":\"ls -la && find . -maxdepth 2 -iname \\\"*.git*\\\" && cat .claude/settings.json 2>/dev/null\",\"description\":\"Inspect repo root and settings for worktree hooks\"}"
      result: ""
    - tool: "EnterWorktree"
      argument: "{}"
      result: ""
    - tool: "Bash"
      argument: "{\"command\":\"grep -rIl \\\"count\\\" docs/decisions docs/decisions 2>/dev/null | xargs grep -liE \\\"corpus\\\" 2>/dev/null\",\"description\":\"Search decisions docs mentioning count and corpus\"}"
      result: ""
    - tool: "Read"
      argument: "/home/james/probe-batches/980-pilot2-2026-09-28/ws/L4-campaign-present-p3-r1/docs/decisions/0049-a-corpus-wide-fold-is-derived-and-never-stored.md"
      result: "sha256:d255555868b70722079d0b561bc02aff4d595a7793080b8c557c37fe8035d976"
    - tool: "Bash"
      argument: "{\"command\":\"grep -n -i \\\"corpus.checks\\\\|export.json\\\\|HW-DR-0049\\\\|fold\\\\|derived and never stored\\\\|write skew\\\" DEVELOPING.md | head -60\",\"description\":\"Search DEVELOPING.md for related terms\"}"
      result: ""
    - tool: "Bash"
      argument: "{\"command\":\"grep -n -i \\\"corpus.checks\\\\|export.json\\\\|headwater export\\\\|census\\\\|graph_export\\\" DEVELOPING.md\",\"description\":\"Search DEVELOPING.md for corpus.checks and export.json references\"}"
      result: ""
    - tool: "Read"
      argument: "/home/james/probe-batches/980-pilot2-2026-09-28/ws/L4-campaign-present-p3-r1/DEVELOPING.md"
      result: "sha256:9e0b1b61b73c2b43d0bfff9054d4df1bbf74b939f65f4837b7b53a23261124fb"
    - tool: "Bash"
      argument: "{\"command\":\"grep -n \\\"^## \\\" DEVELOPING.md\",\"description\":\"List section headings in DEVELOPING.md\"}"
      result: ""
    - tool: "Read"
      argument: "/home/james/probe-batches/980-pilot2-2026-09-28/ws/L4-campaign-present-p3-r1/DEVELOPING.md"
      result: "sha256:9e0b1b61b73c2b43d0bfff9054d4df1bbf74b939f65f4837b7b53a23261124fb"
    - tool: "Bash"
      argument: "{\"command\":\"grep -rn \\\"export.json\\\\|corpus.checks\\\" --include=\\\"*.md\\\" . 2>/dev/null | grep -v \\\"docs/decisions/0049\\\"\",\"description\":\"Search for other mentions of export.json and corpus.checks outside decision 0049\"}"
      result: ""
    - tool: "Read"
      argument: "/home/james/probe-batches/980-pilot2-2026-09-28/ws/L4-campaign-present-p3-r1/engine/README.md"
      result: "sha256:3ced47e09cfb6ec0aeb2494a67d0d60f48aab3abc498ce13f60bee01272b03a7"
    - tool: "Read"
      argument: "/home/james/probe-batches/980-pilot2-2026-09-28/ws/L4-campaign-present-p3-r1/docs/how-to/keep-derived-files-from-conflicting-in-parallel-pull-requests.md"
      result: "sha256:0e19e101adefffeeb0aade75c6d4bdaa0b1401c0e321ab1beb77784abf5a98a3"
    - tool: "Read"
      argument: "/home/james/probe-batches/980-pilot2-2026-09-28/ws/L4-campaign-present-p3-r1/engine/README.md"
      result: "sha256:3ced47e09cfb6ec0aeb2494a67d0d60f48aab3abc498ce13f60bee01272b03a7"
    - tool: "Edit"
      argument: "/home/james/probe-batches/980-pilot2-2026-09-28/ws/L4-campaign-present-p3-r1/engine/README.md"
      result: "sha256:3ced47e09cfb6ec0aeb2494a67d0d60f48aab3abc498ce13f60bee01272b03a7"
    - tool: "Bash"
      argument: "{\"command\":\"grep -rn \\\"corpus.checks\\\\|check/fixtures\\\" tools/engine/engine-readme-fixtures.sh tools/repo/*.sh 2>/dev/null | head -20\",\"description\":\"Check whether fixture scripts pin the edited paragraph's exact text\"}"
      result: ""
    - tool: "Read"
      argument: "/home/james/probe-batches/980-pilot2-2026-09-28/ws/L4-campaign-present-p3-r1/engine/README.md"
      result: "sha256:3ced47e09cfb6ec0aeb2494a67d0d60f48aab3abc498ce13f60bee01272b03a7"
  produced:
    - path: "engine/README.md"
      result: "sha256:3ced47e09cfb6ec0aeb2494a67d0d60f48aab3abc498ce13f60bee01272b03a7"
      cites:
        - "HW-DR-0045"
        - "HW-DR-0049"
        - "HW-DR-0064"
        - "HW-DR-0075"
        - "HW-OBL-0080"
        - "HW-OBL-0115"
        - "HW-OBL-0128"
      findings: []
  answer: null