diff --git a/docs/BACKLOG.md b/docs/BACKLOG.md
index baaa0c629..b5eedcb1a 100644
--- a/docs/BACKLOG.md
+++ b/docs/BACKLOG.md
@@ -38,6 +38,7 @@ are closed (status: closed in frontmatter)._
 - [ ] **[B-0058](backlog/P1/B-0058-ai-ethics-and-safety-research-track.md)** AI ethics + safety research track — filter-gate for resonance adoptions + alignment-clause consistency audit
 - [ ] **[B-0058.1](backlog/P1/B-0058.1-retractibility-gate.md)** AI ethics + safety research track — retractibility-and-log check
 - [ ] **[B-0058.3](backlog/P1/B-0058.3-candidate-failure-honesty-log.md)** Candidate-failure honesty log
+- [ ] **[B-0058.4](backlog/P1/B-0058.4-alignment-clause-drift-detector.md)** Alignment-clause drift detector tool and workflow
 - [ ] **[B-0060](backlog/P1/B-0060-human-lineage-external-anchor-backfill-all-substrate-beacon-safe.md)** Human-lineage / external-anchor backfill across all factory substrate — Beacon-safe + human-anchored prior-art citations for every load-bearing concept
 - [x] **[B-0061](backlog/P1/B-0061-finish-monolith-to-per-row-migration-no-residue-aaron-2026-04-28.md)** Finish docs/BACKLOG.md monolith → per-row migration — "don't miss anything, no residue for next-Otto" (Aaron 2026-04-28)
 - [x] **[B-0063](backlog/P1/B-0063-streamed-installer-download-to-temp-checksum-pattern-codex-p0-pr-75.md)** Streamed-installer download-to-temp + checksum-verify pattern — replace pipe-to-shell for upstream installers (Codex P0 on PR #75)
diff --git a/docs/backlog/P1/B-0058-ai-ethics-and-safety-research-track.md b/docs/backlog/P1/B-0058-ai-ethics-and-safety-research-track.md
index d7b30a9cc..3f2ca9d77 100644
--- a/docs/backlog/P1/B-0058-ai-ethics-and-safety-research-track.md
+++ b/docs/backlog/P1/B-0058-ai-ethics-and-safety-research-track.md
@@ -52,9 +52,10 @@ Every new skill under `.claude/skills/**`, persona under `.claude/agents/**`, gl
 Candidates that fail the ethics+safety gate are recorded as failure-data on the honesty dashboard, NOT silently dropped. Rubber-stamping is the exact failure-mode the three-filter discipline exists to prevent — this gate extends that discipline into the ethics axis.
 *(This item has been sliced into B-0058.3 for atomic mechanization).*
 
-### 4. Alignment-clause drift detector
+### 4. Alignment-clause drift detector (DECOMPOSED -> B-0058.4)
 
 If a clause in `docs/ALIGNMENT.md` is about to be weakened or removed via the renegotiation protocol, this track generates the impact-survey across factory surfaces that touch the clause. Answers "who depends on this clause, and what breaks if it moves?" before the renegotiation is accepted.
+*(This item has been sliced into B-0058.4 for atomic mechanization).*
 
 ### 5. Blast-radius-before-rewrite discipline audit
 
diff --git a/docs/backlog/P1/B-0058.4-alignment-clause-drift-detector.md b/docs/backlog/P1/B-0058.4-alignment-clause-drift-detector.md
new file mode 100644
index 000000000..ec353ac2f
--- /dev/null
+++ b/docs/backlog/P1/B-0058.4-alignment-clause-drift-detector.md
@@ -0,0 +1,39 @@
+---
+id: B-0058.4
+priority: P1
+status: open
+title: Alignment-clause drift detector tool and workflow
+tier: substrate-foundational-discipline
+effort: S
+ask: Aaron 2026-04-21 (decomposed from B-0058)
+created: 2026-05-16
+last_updated: 2026-05-16
+decomposition: leaf
+depends_on: [B-0058]
+composes_with: [docs/ALIGNMENT.md]
+tags: [ai-ethics, ai-safety, alignment, drift-detector, alignment-clause]
+type: friction-reducer
+---
+
+# B-0058.4 — Alignment-clause drift detector tool and workflow (P1)
+
+## Origin
+
+Decomposed from B-0058 (AI ethics + safety research track) to provide an atomic, implementable target for the alignment-clause drift detector mechanism.
+
+## What this row owns
+
+If a clause in `docs/ALIGNMENT.md` is about to be weakened or removed via the renegotiation protocol, this track generates the impact-survey across factory surfaces that touch the clause. Answers "who depends on this clause, and what breaks if it moves?" before the renegotiation is accepted.
+
+Specifically, it requires building a script under `tools/` that can parse `docs/ALIGNMENT.md` and check other files (like personas, memory files, active backlog items) for references to HC-N, SD-N, or DIR-N clauses, providing a report of the blast radius of a change.
+
+## Acceptance Criteria
+
+- A script (e.g., `tools/alignment/detect-clause-drift.ts`) is created.
+- The script correctly identifies cross-references to ALIGNMENT clauses across the repository.
+- A workflow is established for using the tool before ALIGNMENT.md renegotiation is accepted.
+
+## Owner / effort
+
+- **Owner:** Alignment-auditor (Sova).
+- **Effort:** S.