diff --git a/lib/mod/conformance.conf b/lib/mod/conformance.conf
index ee19cec8..0ed46604 100644
--- a/lib/mod/conformance.conf
+++ b/lib/mod/conformance.conf
@@ -48,4 +48,5 @@ SUITES=(
   "temporal:lib/mod/tests/temporal.sx:(mod-temporal-tests-run!)"
   "sla:lib/mod/tests/sla.sx:(mod-sla-tests-run!)"
   "wire:lib/mod/tests/wire.sx:(mod-wire-tests-run!)"
+  "disjunction:lib/mod/tests/disjunction.sx:(mod-disjunction-tests-run!)"
 )
diff --git a/lib/mod/policy.sx b/lib/mod/policy.sx
index 758e2cae..c33a4e73 100644
--- a/lib/mod/policy.sx
+++ b/lib/mod/policy.sx
@@ -1,10 +1,13 @@
 ;; lib/mod/policy.sx — moderation rules → Prolog clauses.
 ;;
 ;; A rule is {:name :action :when}. :when is a list of condition forms; each
-;; compiles to a Prolog goal. Rule order is precedence: the engine queries with
-;; pl-query-one, so the first clause that proves wins. The final default rule has
-;; an empty body (true) so every report yields at least :keep — "no rule matched"
-;; is a real result, not a query failure.
+;; compiles to a Prolog goal. The conditions in a :when list are ANDed (joined by
+;; ", "); :not negates and :any (a list of sub-conditions) disjoins — so the
+;; condition language is a small boolean algebra over the leaf predicates.
+;; Rule order is precedence: the engine queries with pl-query-one, so the first
+;; clause that proves wins. The final default rule has an empty body (true) so
+;; every report yields at least :keep — "no rule matched" is a real result, not a
+;; query failure.
 ;;
 ;; cond->goal takes an id-term so the same condition can be compiled with the
 ;; head variable "Id" (for clause bodies) or a concrete report id (for proof-tree
@@ -43,14 +46,14 @@
 ;; (:classification "spam")  → classification(Id, spam)
 ;; (:evidence "kind")        → evidence(Id, 'kind', _)
 ;; (:attr "verified")        → attr(Id, verified)
-;; (:not <cond>)             → not(<cond>)        (negation as failure)
+;; (:not <cond>)             → not(<cond>)                        (negation)
+;; (:any (list c1 c2 ...))   → (g1 ; g2 ; ...)                    (disjunction)
 ;; (:count-at-least 3)       → report(Id, B, S), report_count(S, N), N >= 3
 ;; (:score-at-least 5)       → aggregate_all(sum(W), signal(Id, _, W), T), T >= 5
 ;; (:reporters-at-least 2)   → report(Id, _, Sr), setof(Br, report(_, Br, Sr), Bsr),
-;;                             length(Bsr, Nr), Nr >= 2   (distinct reporters;
-;;                             needs the quorum engine which asserts every report)
+;;                             length(Bsr, Nr), Nr >= 2   (quorum engine)
 ;; (:burst-at-least 3)       → report(Id, _, Sb), burst_count(Sb, Nb), Nb >= 3
-;;                             (reports in a time window; needs the temporal engine)
+;;                             (temporal engine)
 
 (define
   mod/cond->goal
@@ -71,6 +74,15 @@
         ((= tag :attr) (str "attr(" idterm ", " (nth c 1) ")"))
         ((= tag :not)
           (str "not(" (mod/cond->goal (nth c 1) idterm) ")"))
+        ((= tag :any)
+          (str
+            "("
+            (mod/join-with
+              " ; "
+              (map
+                (fn (sub) (mod/cond->goal sub idterm))
+                (nth c 1)))
+            ")"))
         ((= tag :count-at-least)
           (str
             "report("
diff --git a/lib/mod/scoreboard.json b/lib/mod/scoreboard.json
index 005313c5..f1207f71 100644
--- a/lib/mod/scoreboard.json
+++ b/lib/mod/scoreboard.json
@@ -1,8 +1,8 @@
 {
   "lang": "mod",
-  "total_passed": 323,
+  "total_passed": 333,
   "total_failed": 0,
-  "total": 323,
+  "total": 333,
   "suites": [
     {"name":"decide","passed":31,"failed":0,"total":31},
     {"name":"audit","passed":29,"failed":0,"total":29},
@@ -19,7 +19,8 @@
     {"name":"batch","passed":17,"failed":0,"total":17},
     {"name":"temporal","passed":15,"failed":0,"total":15},
     {"name":"sla","passed":15,"failed":0,"total":15},
-    {"name":"wire","passed":16,"failed":0,"total":16}
+    {"name":"wire","passed":16,"failed":0,"total":16},
+    {"name":"disjunction","passed":10,"failed":0,"total":10}
   ],
-  "generated": "2026-06-06T19:16:49+00:00"
+  "generated": "2026-06-06T19:22:42+00:00"
 }
diff --git a/lib/mod/scoreboard.md b/lib/mod/scoreboard.md
index 21b21cf7..5700d6dc 100644
--- a/lib/mod/scoreboard.md
+++ b/lib/mod/scoreboard.md
@@ -1,6 +1,6 @@
 # mod scoreboard
 
-**323 / 323 passing** (0 failure(s)).
+**333 / 333 passing** (0 failure(s)).
 
 | Suite | Passed | Total | Status |
 |-------|--------|-------|--------|
@@ -20,3 +20,4 @@
 | temporal | 15 | 15 | ok |
 | sla | 15 | 15 | ok |
 | wire | 16 | 16 | ok |
+| disjunction | 10 | 10 | ok |
diff --git a/lib/mod/tests/disjunction.sx b/lib/mod/tests/disjunction.sx
new file mode 100644
index 00000000..dd1f2891
--- /dev/null
+++ b/lib/mod/tests/disjunction.sx
@@ -0,0 +1,145 @@
+;; lib/mod/tests/disjunction.sx — Ext 15: disjunctive (:any) conditions.
+
+(define mod-or-count 0)
+(define mod-or-pass 0)
+(define mod-or-fail 0)
+(define mod-or-failures (list))
+
+(define
+  mod-or-test!
+  (fn
+    (name got expected)
+    (begin
+      (set! mod-or-count (+ mod-or-count 1))
+      (if
+        (= got expected)
+        (set! mod-or-pass (+ mod-or-pass 1))
+        (begin
+          (set! mod-or-fail (+ mod-or-fail 1))
+          (append!
+            mod-or-failures
+            (str name "\n    expected: " expected "\n    got:      " got)))))))
+
+;; one rule, OR of two classifications → one action covers both
+(define
+  mod-or-rules
+  (list
+    (mod/mk-rule
+      "spam-or-abuse-hide"
+      :hide (list
+        (list
+          :any (list (list :classification "spam") (list :classification "abuse")))))
+    (mod/mk-rule "default-keep" :keep (list))))
+
+(define mod-or-spam (mod/mk-report "r1" "a" "b" "this is spam"))
+(define mod-or-abuse (mod/mk-report "r2" "a" "b" "harassment here"))
+(define mod-or-clean (mod/mk-report "r3" "a" "b" "a fine post"))
+
+(mod-or-test!
+  "OR: spam branch → hide"
+  (get
+    (mod/decide-report mod-or-spam (list mod-or-spam) mod-or-rules)
+    :action)
+  "hide")
+(mod-or-test!
+  "OR: abuse branch → hide"
+  (get
+    (mod/decide-report mod-or-abuse (list mod-or-abuse) mod-or-rules)
+    :action)
+  "hide")
+(mod-or-test!
+  "OR: neither branch → keep"
+  (get
+    (mod/decide-report mod-or-clean (list mod-or-clean) mod-or-rules)
+    :action)
+  "keep")
+
+;; ── goal text + proof ──
+
+(mod-or-test!
+  "cond->goal :any joins with ;"
+  (mod/cond->goal
+    (list
+      :any (list (list :classification "spam") (list :classification "abuse")))
+    "Id")
+  "(classification(Id, spam) ; classification(Id, abuse))")
+
+(define
+  mod-or-dec
+  (mod/decide-report mod-or-spam (list mod-or-spam) mod-or-rules))
+(mod-or-test!
+  "OR proof goal solved"
+  (get (first (get (get mod-or-dec :proof) :goals)) :solved)
+  true)
+(mod-or-test!
+  "OR proof goal text"
+  (get (first (get (get mod-or-dec :proof) :goals)) :goal)
+  "(classification(r1, spam) ; classification(r1, abuse))")
+
+;; ── :any composes with :not (NOR-ish) and :attr ──
+
+(define
+  mod-or-mixed-rules
+  (list
+    (mod/mk-rule
+      "spam-or-flagged-hide"
+      :hide (list
+        (list
+          :any (list (list :classification "spam") (list :attr "flagged")))))
+    (mod/mk-rule "default-keep" :keep (list))))
+
+(define
+  mod-or-flagged
+  (mod/attach-attr (mod/mk-report "r4" "a" "b" "a fine post") "flagged"))
+(mod-or-test!
+  "OR over classification|attr: flagged clean post → hide"
+  (get
+    (mod/decide-report
+      mod-or-flagged
+      (list mod-or-flagged)
+      mod-or-mixed-rules)
+    :action)
+  "hide")
+
+(mod-or-test!
+  "cond->goal :any with :not branch"
+  (mod/cond->goal
+    (list
+      :any (list
+        (list :classification "spam")
+        (list :not (list :attr "verified"))))
+    "Id")
+  "(classification(Id, spam) ; not(attr(Id, verified)))")
+
+;; AND still works alongside OR in the same :when list
+(define
+  mod-or-and-rules
+  (list
+    (mod/mk-rule
+      "spam-and-not-verified"
+      :hide (list
+        (list
+          :any (list (list :classification "spam") (list :classification "abuse")))
+        (list :not (list :attr "verified"))))
+    (mod/mk-rule "default-keep" :keep (list))))
+
+(define
+  mod-or-spam-verified
+  (mod/attach-attr (mod/mk-report "r5" "a" "b" "this is spam") "verified"))
+(mod-or-test!
+  "AND of OR + NOT: verified spam → keep"
+  (get
+    (mod/decide-report
+      mod-or-spam-verified
+      (list mod-or-spam-verified)
+      mod-or-and-rules)
+    :action)
+  "keep")
+(mod-or-test!
+  "AND of OR + NOT: unverified abuse → hide"
+  (get
+    (mod/decide-report mod-or-abuse (list mod-or-abuse) mod-or-and-rules)
+    :action)
+  "hide")
+
+(define mod-disjunction-tests-run! (fn () {:failures mod-or-failures :total mod-or-count :passed mod-or-pass :failed mod-or-fail}))
diff --git a/plans/mod-on-sx.md b/plans/mod-on-sx.md
index 3595a15d..27e10349 100644
--- a/plans/mod-on-sx.md
+++ b/plans/mod-on-sx.md
@@ -16,7 +16,7 @@ federation extension.
 
 ## Status (rolling)
 
-`bash lib/mod/conformance.sh` → **323/323** (roadmap + 14 extensions complete)
+`bash lib/mod/conformance.sh` → **333/333** (roadmap + 15 extensions complete)
 
 ## Ground rules
 
@@ -147,6 +147,11 @@ lib/mod/fed.sx
   derivation goal-by-goal with `[proved]`/`[unproved]` marks and unification
   bindings. E.g. `Report rc: escalate (rule: repeated-escalate)` … `[proved]
   report(rc, B, S), report_count(S, N), N >= 3  {B=ann, N=3, S=dave}`.
+- [x] **Ext 15 — disjunctive conditions** (`policy.sx` + `tests/disjunction.sx`,
+  +10). `(:any (list c1 c2 …))` compiles to Prolog disjunction `(g1 ; g2 ; …)`,
+  completing the condition boolean algebra (AND via the :when list, `:not`, `:any`).
+  Composes recursively — `:any` over `:not`/`:attr`/classification, and ANDs with
+  other conditions in the same rule. One rule now covers "spam OR abuse".
 - [x] **Ext 14 — decision wire format** (`lib/mod/wire.sx`, +16). The bytes that
   cross `fed/fed-send!`: `mod/decision->wire` emits a versioned pipe-delimited line
   (`MOD1|r1|hide|spam-hide`), `mod/wire->decision` parses it back (`mod/wire-valid?`
@@ -213,6 +218,12 @@ lib/mod/fed.sx
 
 ## Progress log
 
+- **Ext 15 — disjunctive conditions, 333/333** (+10). The condition DSL is now a
+  full boolean algebra: AND (the :when list), `:not` (NAF), `:any` (Prolog `;`).
+  cond->goal recurses, so the combinators nest arbitrarily — `:any` of `:not`s, an
+  `:any` ANDed with a `:not`, etc. — and the proof tree shows the compiled
+  disjunction verbatim. Maps directly onto Prolog's own control constructs rather
+  than reimplementing boolean logic in SX.
 - **Ext 14 — decision wire format, 323/323** (+16). Fills the federation transport
   seam: decisions now serialize to a portable line and parse back, and the
   integration test runs the whole federated path end-to-end (serialize on one