Imported from nrdxp/predicate (skills/remediation/SKILL.md). Install upstream with npx skills add nrdxp/predicate --skill remediation. Copyright stays with the author.

REMEDIATION — Repairing a Propagated False Claim

Select → Produce → Accept

Why this exists

Detection is not correction, and correction is the expensive half. Two measurements bound this discipline rather than motivate it hypothetically:

• Authors directly notified that work they had cited was retracted still mostly failed to correct it: of 86 authors successfully e-mailed, 51% replied, and at one year only 9 of 86 had published a formal correction (Avenell, Bolland, Gamble & Grey, Accountability in Research, DOI 10.1080/08989621.2022.2082290 — grounded in this record at .ledger/log/2026-08-24-the-number-was-narrower.md [AV2], which corrects an earlier rounded restatement; the raw counts are cited here rather than a derived percentage for the same reason that entry gives).
• In a 2026 multi-agent pipeline with none of the human explanations available — no fatigue, no incentive, no institutional friction — 87 of 266 caught cases had the gate correctly suppress the injected error and the downstream agent still fail to propagate the correction (.ledger/log/2026-08-24-avenell-in-silicon.md [AS4]).

A discipline that stops at "flag it" reproduces both results. This one does not stop there. It is a named, loaded discipline rather than documentation because this project has independently and repeatedly measured that a procedure carried only in memory is a procedure not consulted — the same failure class the two citations above measure at larger scale.

Verification Dual anchor. REMEDIATION closes on both paths at once, per constraint. Where a deterministic evaluator exists — a re-runnable check, a query over the corpus, git diff against an anchor — it is used and named. Where none can exist — locating a hand-authored sentence outside the corpus, judging whether a scope actually covers a dependent set — the constraint says so explicitly and names the witness or human closer that discharges it instead (rules.md §2).

Scope

REMEDIATION is not constraint-authoring (/spec) and not the general category model for durable artifacts (/record) — it composes both. /spec is loaded because every step below is normative (MUST/SHOULD) and carries its evaluator, the same discipline /spec's CONNECT step imposes on test invariants. /record is loaded because the artifacts this procedure produces — a tech-debt entry, a refutation entry, a decision record — are themselves durable-record categories with their own homes and contracts.

Trigger condition: a claim previously treated as settled — closed (proved/cited) or merely asserted in prose, code, or conditioning — is now known to be false, and something else in the system was built on it. If nothing was built on it, this is a one-entry correction and this discipline is unnecessary ceremony (Focus-before-ceremony, ambient.md) — SELECT still runs, briefly, to confirm that.

Ontology

• Claim — a proposition treated as backing something else. Two homes, with different repair economics (PRODUCE, below):
  • corpus claim — a .ledger entry with an id, reachable by derivation edges (because, depends).
  • out-of-corpus claim — a sentence in repository documentation, a code comment, a type name, a conditioning file, or an AGENTS.md requirement. No edge tracks what depends on it.
• Dependent — an artifact whose correctness rests, transitively, on a Claim.
• Species — whether a false claim was born-false (never true — the backing did not hold at its own anchor) or became-false (true when written, false because the record grew around it). Derived, never authored, mirroring the record's existing rule that openness is derived rather than stated (docs/entries.md, "the pen law").
• Currency verdict — a claim of the form "nothing under scope S has changed since commit A" — the only form "still clean" is ever entitled to take (ACCEPT, below).

Machinery status — read before citing a command

Everything under SELECT below runs against master today. dependents_of exists and is verified: an independent jq recursive reverse-walk over the extracted corpus returned the same 44 dependents of write-path:W1 that the hand-written view returns (.ledger/log/2026-08-24-jq-suffices.md [JQ1]).

Everything under PRODUCE's born-false/became-false routing and ACCEPT's currency verdict depends on machinery that, as of this writing, lives on branch feat/refutation-and-currency and is not yet merged to master — verified directly: ledger/gate/currency.py and the refutes field are absent from master's tree (ledger/contracts/entry.ncl on master carries no refutes field outside a comment; ledger/gate/currency.py does not exist on master). The design is not speculative — it is an architect ruling (.ledger/deposits/expiry-mechanics/architect-seat/2026-08-24-ruling-expiry-mechanics.md) plus a compiled model with no sorryAx (.ledger/log/2026-08-24-refutation-is-one-anchored-edge.md [RF1]) — but a walk following this skill before that branch merges cannot invoke the corpus views for species and currency, and must apply the same rule by hand, as each constraint below states.

Act 1 — SELECT: which artifacts depend on the false claim

SEL-1. For a corpus claim, the walk MUST enumerate its dependent set via dependents_of, never via grep — grep answers about text, the corpus answers about extracted entries, and they disagree (.ledger/log/2026-08-24-the-record-was-queryable-all-along.md [QA3]/[QA5]). Evaluator (proved, machine):

python3 ledger/derive/extract_entries.py .ledger -o /tmp/corpus.json
nickel export /tmp/corpus.json --apply-contract ledger/contracts/entries_query.ncl \
  | jq '.dependents_of[] | select(.id=="<claim-id>").dependents'

Grounded by ledger/gate/test_dependents_query.sh (multi-hop, mixed edge kinds, cycle, external exclusion, empty-leaf cases) and the independent jq cross-check above.

SEL-2. For an out-of-corpus artifact, no edge exists to walk — this is the hard case named up front, not papered over. The walk MUST establish the universe before claiming coverage (git ls-files for the repository, git -C .ledger ls-files log/ for the corpus proper) and then search by citation or content — a decorrelated searcher (semantic search, grepai, or a fresh-context agent) looking for the claim's substance, its id, or its distinguishing phrase. Evaluator: none deterministic exists — closes adversarially, by the searcher's report, which MUST state what it searched and what it could not rule out (SEL-5 names the residual gap this leaves).

SEL-3. SELECT's output MUST be a list of dependents with their location (corpus id, or file:line), never a bare count — a count with no enumerable members cannot be handed to PRODUCE. Evaluator: structural (agent-check) — the deposit's dependent list carries a location per row or is explicitly empty; a bare integer with no enumerable members fails a zero-context read of the deposit (/record's Gate 2 sensibility read).

SEL-4. A dependent classified external by dependents_of (support that left the corpus) is NOT resolved by this discipline's machinery — its provenance is outside the record's reach by construction. It MUST be listed as a residual, not silently dropped. Evaluator: structural — the count of rows in the residual list tagged external matches dependents_of's own external-tagged member count for the same claim; a mismatch is a dropped dependent.

SEL-5. Semantic re-derivation — the false claim re-expressed in words sharing no substring with the original — is not solved by SEL-2 or anything else in this skill. Say so at report time rather than implying SELECT was exhaustive; see Honest Limits. Evaluator: presence — the final report's Honest Limits section states this gap explicitly; an evaluator can confirm the sentence is present, never that SELECT actually found every semantically-equivalent restatement — that half closes by nothing this skill supplies.

Act 2 — PRODUCE: a replacement free of the false claim

PRO-1. Each dependent MUST be classified composed (regenerated by fixing its source — a Nickel view, a generated YAML, a chain_floor-style derived read) or hand-authored (prose, a decision, a manually written comment) before it is touched. This classification is what determines the cost of the whole exercise, per .ledger/log/2026-08-24-remediation-factors.md [RM3]: composed artifacts are free to re-derive; hand-authored ones must be found and edited one at a time, and SELECT already found them. Evaluator: structural, partial — an edge from the dependent to a named generator/tool (a because ref — the derives-from:: prose token — or a build-script relationship) is evidence for composed; its absence is evidence for hand-authored, never proof — a hand-authored artifact that happens to cite a tool is still hand-authored, so a wrong classification on that basis is a reviewable, not a machine-caught, error.

PRO-2 — composed dependent. MUST fix the source and regenerate; MUST NOT hand-edit the generated artifact directly — that edit is overwritten (or silently diverges from) the next regeneration, which is drift reintroducing itself. Evaluator: diff between the freshly regenerated artifact and the previously hand-patched one is empty.

PRO-3 — hand-authored dependent. MUST be located (SELECT already did this) and edited directly; there is no source to regenerate from. Evaluator: none deterministic beyond the edit itself — closes by the editing walk's own commit, reviewed at the same bar any code-edit floor review applies (ambient.md §Code-Edit Constraints).

Species routing. Determine species before choosing a repair path for the false claim's OWN entry (not its dependents — those are PRO-1/2/3 regardless of species). Given a refuting claim R anchored at r_anchor targeting claim C:

Evaluator (once feat/refutation-and-currency merges, proved/machine): the refutations view in entries_query.ncl derives this per row, never authored as a label (.ledger/log/2026-08-24-refutation-is-one-anchored-edge.md RF3/RF4). Until then: apply the table by hand; verify the ancestor relationship with git merge-base --is-ancestor <r_anchor> HEAD rather than assuming it.

PRO-4 — became-false. MUST either re-establish the claim or let it lapse; MUST NOT silently leave it marked current. Re-establishment is species-of-backing-dependent, not "re-run the same check" unconditionally (architect ruling [R5]): a corroborated claim is re-established by re-running the named check and re-anchoring — the command quantifies over its scope by construction. A vouched claim is re-established by the witness re-vouching; a re-vouch MAY narrow to the delta (git diff --name-only <at> HEAD -- <scope>) but the chain of narrowed re-vouches MUST floor on a full-scope re-vouch periodically, or it drifts arbitrarily far from any full read — the same defect chain_floor exists to expose, at the currency grain. Evaluator: the re-run's exit code (corroborated) or the witness's new Witness{name, at} entry (vouched — closes by witness, not machine).

PRO-5 — born-false, target OPEN (unclosed/synthesis). No closure was ever claimed, so there is no collision to adjudicate. MUST repair by content: author a corrected entry; the original may be superseded (supersedes, which "types nothing — any entry may be retired unanswered by a survivor," ledger/contracts/entry.ncl:747). Evaluator: machine for the edge, agent-check for the content — a dangling or cyclic supersedes is refused by EntryStore (SupersessionTerminates, entry.ncl:926); the corrected content itself closes the same way any new claim does, by its own backing.

PRO-6 — born-false, target CLOSED (proved/cited). MUST NOT repair by content alone. A snapshot-sound closure and a true refutation at the same anchor are jointly impossible (the impeachment theorem, .ledger/log/2026-08-24-refutation-is-one-anchored-edge.md RF3) — the model proves the pair contradictory and cannot itself say which party lied. The walk MUST:

1. Author the anchored refutes edge (this is what makes the collision derivable at all — an unanchored "C is false" is itself the model's canonical non-monotone expiring claim, refused by RefutesAnchored).
2. MUST NOT auto-resolve the collision. Route it to a human closer — never an agent's own reading of which side is right (RF4: "routed to a human closer, never auto-resolved by this view or any other").
3. The human's ruling is recorded as a new entry, since the ledger is append-only (docs/entries.md: "a deposit is amended by a new entry"). If the ruling finds the original evidence event unsound, that new entry MUST supersede the original — this IS the grade withdrawal an append-only record can perform: not an in-place edit of the old grade, a superseding record that retires it. Evaluator (once merged): impeachment_queue — every refutations row whose target is corroborated/vouched and species born-false. Until merged: apply the routing-table test by hand and halt for the same human closer; do not proceed past step 2 without one.

Act 3 — ACCEPT: nothing dependent remains unrepaired

This can never be permanently true. A new dependent can always appear after SELECT ran, so "everything is clean" is a claim with an expiry, never a standing fact — this is a theorem (.ledger/log/2026-08-24-remediation-factors.md [RM4], current_state_does_not_bank), not a limitation of this discipline's diligence. ACCEPT's output MUST be phrased as a currency verdict, never as an unqualified "done."

ACC-1. A currency verdict is current iff nothing under its declared scope (a git pathspec) has changed since its anchor commit. Evaluator (once merged, proved/machine): ledger/gate/currency.py --anchor <at> --scope <pathspec> --repo . — exit 0 current, 1 lapsed (changed paths named), 2 anchor-not-an-ancestor (orphaned, not lapsed), 3 environment error. Until merged, the underlying evaluator is the same command the wrapper runs: git diff --quiet <at> HEAD -- <pathspec>.

ACC-2 — scope MUST cover the dependent set. The scope is a git pathspec and MUST cover the home files of dependents_of(C) as computed at the anchor (architect ruling [R4]) — the anchor and the coverage are both obligations, neither is optional. A pathspec over-approximates the dependent set by design (an irrelevant change costing one extra re-run is the cheap failure direction; a real dependent outside the scope producing a false "current" is the expensive one). This is unclosed today, and it is tracked, not papered over: no evaluator in this system decides whether a given scope actually covers a claim's real dependent set — every theorem behind the currency machinery holds just as well for a deliberately narrow scope as for a correct one (.ledger/tech-debt/currency-scope-adequacy-unclosed.yaml). The scope is authored by the party who benefits from it being narrow, so it does not close on its own author's word — a currency verdict's scope MUST be confirmed by a second, decorrelated party against the actual dependents_of output before the verdict is treated as current, until the tracked coverage check lands. Evaluator: none machine-checkable exists today (the tracked gap itself) — closes adversarially, by a decorrelated reviewer's confirmation that the pathspec's glob set is a superset of dependents_of(C)'s reported locations.

ACC-3. On lapse, the walk MUST NOT re-assert currency silently. Re-establishment follows PRO-4's species-of-backing split exactly (a scrub verdict is itself a non-monotone claim, and the currency machinery is that claim's cure applied — .ledger/log/2026-08-24-where-the-findings-land.md [WL3]). Evaluator: PRO-4's, inherited — the re-run's exit code (corroborated) or a new Witness{name, at} entry (vouched); this constraint adds no evaluator of its own, only the obligation to invoke PRO-4's rather than skip it.

ACC-4 — block attaches to USE, not to existence. A commit that changes a live verdict's scope MUST NOT itself be blocked — lapsing is normal operation. What MUST block: a promotion into repository documentation or agent conditioning whose support chain bottoms out at a lapsed verdict, and a gate CLOSE whose satisfying claim rests on one. A corpus-wide lapse sweep gating every commit is explicitly REJECTED (over-blocking degrades a blocking gate into a reporting one — the same failure mode OCSP soft-fail demonstrated at internet scale, cited in the architect ruling [EX6]/[R6]). Evaluator: today, terminal_freshness.py checks only that a cure is declared, by its own stated limit — not that it is current. Extending it to check currency is the natural next step this discipline does not itself build; name it as a dependency if this discipline is invoked before that extension lands.

Routing summary

false claim found
  │
  ▼
SELECT
  ├─ in corpus ─────────▶ dependents_of(C)                    [SEL-1, machine]
  └─ out of corpus ─────▶ search by citation/content           [SEL-2, adversarial]
  │
  ▼
list of dependents with locations, external rows kept as residual  [SEL-3, SEL-4]
  │
  ▼
PRODUCE ── each dependent: composed? ──yes──▶ fix source, regenerate [PRO-2]
  │                            │
  no                           no
  │                            ▼
  ▼                     hand-edit directly [PRO-3]
determine C's species (table above)
  │
  ├─ became-false ──────────▶ re-establish or let lapse [PRO-4]
  ├─ born-false, C open ────▶ repair by content, may supersede [PRO-5]
  ├─ born-false, C closed ──▶ HALT: refutes edge → human closer →
  │                            superseding entry withdraws the grade [PRO-6]
  └─ unclassifiable ────────▶ HALT: no anchor to compare, do not guess
  │
  ▼
ACCEPT: currency verdict {scope, at}, scope covers dependents_of(C),
        confirmed by a second party [ACC-1..4] — expires by construction

MANDATORY HALT points

1. Unclassifiable refutation (C has no anchor). Do not guess a species from missing evidence; the target may need re-anchoring before this discipline can proceed at all.
2. Born-false on a closed claim. Never auto-resolve the impeachment collision. Route to a human closer and wait.
3. A dependent found external. Its provenance left the corpus by construction — surface it as a residual, do not attempt to repair what the record cannot reach.
4. A scope the author cannot show covers dependents_of(C). ACC-2's coverage confirmation is not optional ceremony; an unconfirmed scope is an unverified currency verdict wearing a verified one's clothes.

Honest limits

• The measured ceiling for correction propagation across every studied field is 5–20%, and it has been flat for decades. State this plainly when reporting a remediation's outcome. It is a worst-cell reading — no trace, no check, no generator, no pen, unexpiring verdicts, every axis at its worst simultaneously (.ledger/log/2026-08-24-remediation-factors.md [RM5]) — not a bound on what this discipline's cure class can achieve, but also not something this discipline has demonstrated beating. Do not claim victory over the literature's number from having followed this procedure once.
• Scope adequacy is unsolved, tracked in .ledger/tech-debt/currency-scope-adequacy-unclosed.yaml. Every guarantee ACCEPT states holds exactly as well for a mis-scoped verdict as for a correct one. ACC-2's decorrelated-confirmation requirement is a stopgap on top of that tech-debt entry's own discharge condition, not a substitute for it.
• Semantic re-derivation is not solved by anything here. SEL-2's citation/content search finds a claim restated in recognizable language; a claim re-expressed in words sharing no substring with the original can pass through undetected. This is named, not hidden, per SEL-5.
• Born-false/became-false routing and currency verdicts depend on unmerged machinery (feat/refutation-and-currency). Every constraint above states its fallback; the fallback is a human/manual application of the same rule, not a weaker rule.

Prime Directives

1. SELECT_BEFORE_PRODUCE. Never edit a dependent found by intuition alone when dependents_of can enumerate it. Grep is for text; the corpus answers about entries, and the two disagree.
2. CLASSIFY_BEFORE_EDIT. A dependent is composed or hand-authored before it is touched, not discovered to be one after the fact.
3. SPECIES_BEFORE_REPAIR. Born-false and became-false take different repairs; applying became-false's "re-establish or lapse" to a born-false claim, or born-false's impeachment routing to a became-false one, is a protocol violation, not a shortcut.
4. NEVER_AUTO_WITHDRAW_A_CLOSED_GRADE. An agent walk MUST NOT decide, on its own reading, that a closed claim's grade is wrong and act on that decision without a human closer. The model proves the collision contradictory; it does not name which party lied, and neither does this discipline.
5. ACCEPT_EXPIRES. "Clean" is never asserted without a scope and an anchor. An unqualified "remediation complete" is a protocol violation of the same shape RM4 names as a theorem, not a judgment call this discipline defers to the walk.

Protocol Violations (FORBIDDEN)

Position in the workflow chain

false claim found → REMEDIATION (Select → Produce → Accept)
                          │              │            │
                          ▼              ▼            ▼
                    /record's       /spec's        /record's
                  tech-debt/         VERIFIED      tech-debt for
                  category for     tagging for      the scope-
                  the residual      each repair      adequacy gap,
                  and unclassed     constraint's     currency
                  gaps this pass    own evaluator    verdict entries
                  surfaces

REMEDIATION is invoked wherever a walk of any kind discovers a claim it relied on is false — not only from within /spec. A council seat finding a born-false claim in a deposit under review, a /core worker whose test invariant was derived from a since-refuted premise, and a /campaign reconcile finding a worker's IBC rested on stale premises all load this same discipline rather than improvising a one-off fix.