diff --git a/.github/workflows/spec-guards.yml b/.github/workflows/spec-guards.yml
index 905b15ca7a..51f2577b00 100644
--- a/.github/workflows/spec-guards.yml
+++ b/.github/workflows/spec-guards.yml
@@ -119,15 +119,15 @@ jobs:
       # gen/c/claw/gates.c is committed (force-added; gen/ is ignored but
       # tracked) and the claw-drift step in gate-topology.yml feeds those
       # COMMITTED bytes -- nothing else holds them to their spec. An edit to
-      # specs/claw/gates.t27 without a regen would drift silently: the
-      # committed C would keep answering for a spec it no longer lowers.
-      # Same shape as t27o-golden's check mode (#8996): regenerate, then
-      # diff --exit-code.
-      - name: committed gen/c/claw/gates.c and t27f_gate.c are what their specs lower to today
+      # specs/claw/gates.t27 without a regen would drift silently. So would the IGLA board's
+      # own_model event, which a Railway cron reposts from master's committed JSON (#10321).
+      # Same shape as t27o-golden's check mode (#8996): regenerate, then diff --exit-code.
+      - name: committed gen/c/claw/*.c and gen/json/igla/own_model_board.json are what their specs lower to today
         run: |
           ./target/release/t27c gen-c specs/claw/gates.t27 > gen/c/claw/gates.c
           ./target/release/t27c gen-c specs/claw/t27f_gate.t27 > gen/c/claw/t27f_gate.c
-          git diff --exit-code -- gen/c/claw/gates.c gen/c/claw/t27f_gate.c
+          ./target/release/t27c gen-json specs/igla/own_model_board.t27 > gen/json/igla/own_model_board.json
+          git diff --exit-code -- gen/c/claw/gates.c gen/c/claw/t27f_gate.c gen/json/igla/own_model_board.json
 
       # #7565: test only the specs this change can affect. specs/ci/affected.t27 picks them (the
       # changed specs and every spec that imports one through `use`, transitively); the graph is the
diff --git a/.trinity/seals/crons_cron_t27_own_model_board.json b/.trinity/seals/crons_cron_t27_own_model_board.json
new file mode 100644
index 0000000000..ba153ffbc6
--- /dev/null
+++ b/.trinity/seals/crons_cron_t27_own_model_board.json
@@ -0,0 +1,28 @@
+{
+  "built_by": "t27c-bootstrap@0.5.2+79126608b",
+  "closure": [],
+  "config": "gen=c,rust,verilog,zig;tests=zig",
+  "gen_hash_c": "sha256:85795a37414e093c16332554b79f7de01d40e6a4111ad2bcff55c6c51dc51c59",
+  "gen_hash_rust": "sha256:aff9afd3ae6f0a87fdff5b0d722f17b27eb20edf9213b7f80dd6a966d9509aaa",
+  "gen_hash_verilog": "sha256:cd58d73af401293da1e1d909746c535f792224a36b2ecee76a653b450e8c8ff7",
+  "gen_hash_zig": "sha256:6d8b5e3d207ebd83d018fcb4949e80f69e478c5bbd3d769e49068d98d55010a0",
+  "module": "cron_t27_own_model_board",
+  "ring": 12,
+  "seal_schema": 2,
+  "sealed_at": "2026-10-18T08:54:26Z",
+  "sealed_by": "t27c-bootstrap@0.5.2",
+  "spec_hash": "sha256:3032ee2782ec57a66af46e64bb269d5185a8a08bacaeb2db26cb48cbe1f7f921",
+  "spec_path": "specs/crons/t27-own-model-board.t27",
+  "tests": {
+    "failed": 0,
+    "failing": [],
+    "forced": false,
+    "passed": 3,
+    "total": 3,
+    "vacuous": 0
+  },
+  "toolchain": {
+    "test_runner": "sha256:1982ae948e24d00c5d221ccec12dfce1eb01204b53e37b0f857f93b16d64629d",
+    "zig": "0.16.0"
+  }
+}
\ No newline at end of file
diff --git a/gen/json/igla/own_model_board.json b/gen/json/igla/own_model_board.json
new file mode 100644
index 0000000000..29e760a559
--- /dev/null
+++ b/gen/json/igla/own_model_board.json
@@ -0,0 +1 @@
+{"job":"own_model","stage":"own_model","msg":"1 published, 17 verified, 8 drafts, 1 gaps; 61%","progress":0.61,"metrics":{"lens_pct":[65,70,48],"cells":[{"status":4,"pct":60},{"status":4,"pct":70},{"status":4,"pct":80},{"status":4,"pct":80},{"status":4,"pct":60},{"status":4,"pct":100},{"status":3,"pct":50},{"status":3,"pct":90},{"status":0,"pct":0},{"status":4,"pct":100},{"status":4,"pct":100},{"status":4,"pct":20},{"status":4,"pct":80},{"status":4,"pct":65},{"status":4,"pct":95},{"status":3,"pct":75},{"status":3,"pct":55},{"status":3,"pct":40},{"status":4,"pct":70},{"status":4,"pct":15},{"status":5,"pct":60},{"status":4,"pct":40},{"status":4,"pct":100},{"status":4,"pct":60},{"status":3,"pct":30},{"status":3,"pct":10},{"status":3,"pct":50}]}}
diff --git a/specs/crons/t27-own-model-board.t27 b/specs/crons/t27-own-model-board.t27
new file mode 100644
index 0000000000..2dd41f3592
--- /dev/null
+++ b/specs/crons/t27-own-model-board.t27
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: Apache-2.0
+; specs/crons/t27-own-model-board.t27 -- cron railway-cron/t27/own-model-board
+; Source of truth for the job card on t27.ai (#/crons?cron=railway-cron/t27/own-model-board).
+; The schedule lives on Railway service own-model-board in project igla-judge (the board's project,
+; so the board's private port is reachable); the payload lives here, in gHashTag/t27 (#10321).
+; What one fire does, in words: fetch master's gen/json/igla/own_model_board.json from
+; raw.githubusercontent.com and POST it, unchanged, to http://board.railway.internal:8081/event.
+; That file is `t27c gen-json specs/igla/own_model_board.t27`, held to its spec by spec-guards.yml
+; (regenerate, then git diff --exit-code). So a spec change reaches the board at the next fire,
+; and a board redeploy, which empties its live map, is repaired at the next fire too.
+; The service is the public image curlimages/curl and holds no variable: the private port takes
+; no token, and the public repository needs none.
+; A cron CONTROLS skills: RUNS names the skill IDs it launches. It is empty
+; unless the source evidently invokes one -- nothing here is inferred from a name.
+; phi^2 + 1/phi^2 = 3 | TRINITY
+
+module cron_t27_own_model_board;
+
+pub const KIND : str = "cron";
+pub const ID : str = "railway-cron/t27/own-model-board";
+pub const NAME : str = "own-model-board";
+pub const HOST : str = "railway-cron";
+pub const REPO : str = "t27";
+pub const SERVICE : str = "own-model-board";
+pub const SUMMARY_EN : str = "Reposts the own_model event (the 27-cell map of specs/igla/own_model.t27) to the IGLA board, from the JSON t27c generates on master.";
+; Four fires a day: an event that has not changed only refreshes its receive time, and the
+; board keeps the last 200 events, so a tighter period would crowd out every other job.
+pub const SCHEDULE : str = "17 */6 * * *";
+pub const TZ : str = "UTC";
+pub const RUNS : [0]str = [];
+pub const RUNS_NOTE : str = "posts one board event; invokes no skill";
+pub const ENABLED : bool = true;
+pub const NOTE : str = "Railway project igla-judge, service own-model-board. The schedule is set on the service, not in a checkout; the payload is gen/json/igla/own_model_board.json on master.";
+pub const ON_FAILURE : str = "log";
+pub const CONTROL : str = "railway-dashboard";
+
+; The card held to the schema of specs/crons/README.md: ID is <host>/<repo>/<slug>; HOST,
+; ON_FAILURE and CONTROL come from fixed vocabularies; RUNS, the control link, is empty unless
+; the source evidently invokes a skill, and RUNS_NOTE then says why.
+test id_is_host_repo_and_slug {
+    // HOST is one of the five hosts the README names.
+    assert HOST == "github-actions" or HOST == "inngest" or HOST == "railway-cron" or HOST == "timer" or HOST == "launchd";
+    // ID opens with HOST, a `/`, REPO and a `/`.
+    var i : usize = 0;
+    while (i < HOST.len) {
+        assert ID[i] == HOST[i];
+        i = i + 1;
+    }
+    assert ID[HOST.len] == '/';
+    var r : usize = 0;
+    while (r < REPO.len) {
+        assert ID[HOST.len + 1 + r] == REPO[r];
+        r = r + 1;
+    }
+    assert ID[HOST.len + 1 + REPO.len] == '/';
+    // The slug after it is one path segment, not empty, and names the Railway service.
+    assert ID.len == HOST.len + REPO.len + 2 + SERVICE.len;
+    var s : usize = 0;
+    while (s < SERVICE.len) {
+        assert ID[HOST.len + REPO.len + 2 + s] == SERVICE[s];
+        assert SERVICE[s] != '/' and SERVICE[s] != ' ';
+        s = s + 1;
+    }
+}
+test vocabularies_and_the_control_link {
+    assert KIND == "cron";
+    assert ON_FAILURE == "issue" or ON_FAILURE == "log" or ON_FAILURE == "unknown";
+    assert CONTROL == "github-actions-dispatch" or CONTROL == "railway-dashboard" or CONTROL == "inngest-dashboard" or CONTROL == "code-only";
+    // An empty RUNS carries its reason in RUNS_NOTE.
+    assert RUNS.len > 0 or RUNS_NOTE.len > 0;
+}
+test the_schedule_is_four_fires_a_day {
+    // Five fields separated by single spaces, no blank field.
+    var spaces : usize = 0;
+    var k : usize = 0;
+    while (k < SCHEDULE.len) {
+        if (SCHEDULE[k] == ' ') {
+            spaces = spaces + 1;
+            assert k > 0 and k + 1 < SCHEDULE.len and SCHEDULE[k + 1] != ' ';
+        }
+        k = k + 1;
+    }
+    assert spaces == 4;
+    // A fixed minute, not `*`: one fire per matching hour. Hour field `*/6`: four a day.
+    assert SCHEDULE[0] >= '0' and SCHEDULE[0] <= '9';
+    assert SCHEDULE[3] == '*' and SCHEDULE[4] == '/' and SCHEDULE[5] == '6';
+    assert TZ == "UTC";
+    assert ENABLED;
+}