diff --git a/conformance/tests/l0-static/alert-metrics-have-scrape-targets/check.sh b/conformance/tests/l0-static/alert-metrics-have-scrape-targets/check.sh
index 6740752..23653f9 100755
--- a/conformance/tests/l0-static/alert-metrics-have-scrape-targets/check.sh
+++ b/conformance/tests/l0-static/alert-metrics-have-scrape-targets/check.sh
@@ -448,9 +448,14 @@ def is_golden_fixture(p: Path) -> bool:
     return "conformance" in parts and "golden" in parts
 
 
+# NESTED WORKTREES: skip dot-DIRECTORIES (.git, .claude) while still matching dot-FILES such
+# as .sops.yaml. .claude/worktrees/agent-*/ holds full repo copies for isolated agent runs, so
+# a bare rglob from ROOT audited up to 18 duplicates of every file — which both invents FAILs
+# and, worse, can satisfy an "something declares X" check from a copy rather than real source.
+# Same fix as egress-paths-selected-by-rules. .claude/ is gitignored (.gitignore:43).
 rule_files = sorted(
     p for p in ROOT.rglob("*.yaml")
-    if ".git" not in p.parts and not is_golden_fixture(p) and "kind: PrometheusRule" in read(p)
+    if not any(part.startswith(".") for part in p.relative_to(ROOT).parent.parts) and not is_golden_fixture(p) and "kind: PrometheusRule" in read(p)
 )
 check(len(rule_files) > 0,
       "no file declaring `kind: PrometheusRule` found — the parser or the repo layout changed; "
@@ -619,7 +624,7 @@ def yaml_docs(path: Path) -> list[dict]:
 # job name -> (relpath, monitor endpoint ports, ports the co-authored Services define)
 same_file_monitors: dict[str, tuple[str, set[str], set[str]]] = {}
 for p in sorted(ROOT.rglob("*.yaml")):
-    if ".git" in p.parts:
+    if any(part.startswith(".") for part in p.relative_to(ROOT).parent.parts):
         continue
     txt = read(p)
     if "kind: ServiceMonitor" not in txt or "kind: Service" not in txt:
diff --git a/conformance/tests/l0-static/alert-rules-unit-tested/check.sh b/conformance/tests/l0-static/alert-rules-unit-tested/check.sh
index 5716316..f782119 100755
--- a/conformance/tests/l0-static/alert-rules-unit-tested/check.sh
+++ b/conformance/tests/l0-static/alert-rules-unit-tested/check.sh
@@ -280,11 +280,16 @@ FETCH_RE = re.compile(
 #     versions.env. What is forbidden is a RULE-UNIT RUN acquiring its own engine: then the
 #     version, the network and the machine are decided silently at test time, and a missing
 #     toolchain becomes a green run instead of an exit 3.
+# NESTED WORKTREES: skip dot-DIRECTORIES (.git, .claude) while still matching dot-FILES such
+# as .sops.yaml. .claude/worktrees/agent-*/ holds full repo copies for isolated agent runs, so
+# a bare rglob from ROOT audited up to 18 duplicates of every file — which both invents FAILs
+# and, worse, can satisfy an "something declares X" check from a copy rather than real source.
+# Same fix as egress-paths-selected-by-rules. .claude/ is gitignored (.gitignore:43).
 SELF_DIR = "conformance/tests/l0-static/alert-rules-unit-tested/"
 INSTALLERS = (".gitea/workflows/scripts/install-tools.sh", "infra/devcontainer/")
 for p in sorted(ROOT.rglob("*.sh")):
     rel = str(p.relative_to(ROOT))
-    if rel.startswith((".git/", "conformance/runs/", SELF_DIR)):
+    if rel.startswith((".git/", ".claude/", "conformance/runs/", SELF_DIR)):
         continue
     try:
         text = p.read_text()
@@ -319,7 +324,7 @@ def tracked_yaml() -> list[Path]:
         return [ROOT / p for p in out.stdout.split("\0") if p]
     # No usable index (the gate container mounts a worktree whose .git points outside the
     # mount). Fall back to a filesystem walk rather than auditing nothing.
-    return sorted(p for p in ROOT.rglob("*.y*ml") if ".git/" not in str(p))
+    return sorted(p for p in ROOT.rglob("*.y*ml") if not any(part.startswith(".") for part in p.relative_to(ROOT).parent.parts))
 
 
 KIND_RE = re.compile(r"^\s*kind:\s*PrometheusRule\s*$", re.M)
diff --git a/conformance/tests/l0-static/alert-runbooks-resolvable/check.sh b/conformance/tests/l0-static/alert-runbooks-resolvable/check.sh
index 8777529..1d2df3a 100755
--- a/conformance/tests/l0-static/alert-runbooks-resolvable/check.sh
+++ b/conformance/tests/l0-static/alert-runbooks-resolvable/check.sh
@@ -126,9 +126,14 @@ def read(p: Path) -> str:
 SCOPE_DECL_RE = r"^\s*conformance\.home\.k3s/scope:\s*[\"\']?whole-repo"
 RUNBOOK_URL_RE = re.compile(r"""^\s*runbook_url:\s*["']?([^"'\s#]+)["']?\s*$""")
 
+# NESTED WORKTREES: skip dot-DIRECTORIES (.git, .claude) while still matching dot-FILES such
+# as .sops.yaml. .claude/worktrees/agent-*/ holds full repo copies for isolated agent runs, so
+# a bare rglob from ROOT audited up to 18 duplicates of every file — which both invents FAILs
+# and, worse, can satisfy an "something declares X" check from a copy rather than real source.
+# Same fix as egress-paths-selected-by-rules. .claude/ is gitignored (.gitignore:43).
 rule_files = sorted(
     p for p in ROOT.rglob("*.yaml")
-    if ".git" not in p.parts and "kind: PrometheusRule" in read(p)
+    if not any(part.startswith(".") for part in p.relative_to(ROOT).parent.parts) and "kind: PrometheusRule" in read(p)
 )
 check(len(rule_files) > 0,
       "no file declaring `kind: PrometheusRule` found — the parser or the repo layout changed; "
diff --git a/conformance/tests/l0-static/placeholder-guard-coupling/check.sh b/conformance/tests/l0-static/placeholder-guard-coupling/check.sh
index 8189263..f3843f3 100755
--- a/conformance/tests/l0-static/placeholder-guard-coupling/check.sh
+++ b/conformance/tests/l0-static/placeholder-guard-coupling/check.sh
@@ -238,7 +238,7 @@ def bail(msg):
 
 DEF_RE = re.compile(r"^([a-z0-9_]+_is_placeholder)\(\)\s*\{")
 SELF_DIR = ROOT / "conformance" / "tests" / "l0-static" / "placeholder-guard-coupling"
-SKIP_DIRS = {".git", "_artifacts", "node_modules", ".venv"}
+SKIP_DIRS = {".git", ".claude", "_artifacts", "node_modules", ".venv"}
 
 # ------------------------------------------------------------------ discover the guard FILE
 # Hardcoding a path is what let a file that never landed disable this whole check.
diff --git a/conformance/tests/l0-static/servicemonitor-ports-resolve/check.sh b/conformance/tests/l0-static/servicemonitor-ports-resolve/check.sh
index a03038b..f720678 100755
--- a/conformance/tests/l0-static/servicemonitor-ports-resolve/check.sh
+++ b/conformance/tests/l0-static/servicemonitor-ports-resolve/check.sh
@@ -154,8 +154,13 @@ services: list[tuple] = []
 monitors: list[tuple] = []
 unparseable: list[str] = []
 
+# NESTED WORKTREES: skip dot-DIRECTORIES (.git, .claude) while still matching dot-FILES such
+# as .sops.yaml. .claude/worktrees/agent-*/ holds full repo copies for isolated agent runs, so
+# a bare rglob from ROOT audited up to 18 duplicates of every file — which both invents FAILs
+# and, worse, can satisfy an "something declares X" check from a copy rather than real source.
+# Same fix as egress-paths-selected-by-rules. .claude/ is gitignored (.gitignore:43).
 for p in sorted(ROOT.rglob("*.yaml")):
-    if ".git" in p.parts or is_test_fixture(p) or ".sops." in p.name:
+    if any(part.startswith(".") for part in p.relative_to(ROOT).parent.parts) or is_test_fixture(p) or ".sops." in p.name:
         continue
     txt = read(p)
     if not txt:
diff --git a/platform/monitoring/tests/run.sh b/platform/monitoring/tests/run.sh
index fab6956..1458601 100755
--- a/platform/monitoring/tests/run.sh
+++ b/platform/monitoring/tests/run.sh
@@ -116,10 +116,14 @@ fi
 # `.git` file points outside the mount, so git cannot read the index there — and with
 # `pipefail` that failure silently emptied the discovery, i.e. a green run over ZERO tests
 # (observed 2026-09-12). `find` needs no repo metadata, so discovery cannot be disabled by
-# how the tree happens to be mounted. .git/ is pruned so a stale object copy is never picked up.
+# how the tree happens to be mounted. .git/ is pruned so a stale object copy is never picked up,
+# and .claude/ with it: .claude/worktrees/agent-*/ holds full repo copies for isolated agent
+# runs, so an unpruned find reported the SAME manifest under test once per worktree (up to 18
+# times), and the L0 check that compares this listing against the tree failed on paths that
+# are not authored surface at all (.claude/ is gitignored, .gitignore:43).
 discover() {
   # Companion convention, anywhere in the tree.
-  find "${ROOT}" -path "${ROOT}/.git" -prune -o -name '*.promtool-test.yaml' -print 2>/dev/null
+  find "${ROOT}" \( -path "${ROOT}/.git" -o -path "${ROOT}/.claude" \) -prune -o -name '*.promtool-test.yaml' -print 2>/dev/null
   # Suite convention, ANYWHERE in the tree — not just this directory.
   #
   # This used to be `find "${HERE}" -maxdepth 1`, which made the suite convention a
@@ -129,7 +133,7 @@ discover() {
   # as the rules this harness exists to test. Found 2026-09-13 adding apps/wave-*/tests/. Scoped by
   # NAME only; manifests_for() then refuses (loudly) any *.test.yaml that is not inside a tests/
   # directory, so a misplaced file fails rather than disappearing.
-  find "${ROOT}" -path "${ROOT}/.git" -prune -o -name '*.test.yaml' -print 2>/dev/null
+  find "${ROOT}" \( -path "${ROOT}/.git" -o -path "${ROOT}/.claude" \) -prune -o -name '*.test.yaml' -print 2>/dev/null
 }
 
 TESTS=()