diff --git a/.kiro/specs/worker-rejoin-resync/tasks.md b/.kiro/specs/worker-rejoin-resync/tasks.md
index 08998123..91fe14c1 100644
--- a/.kiro/specs/worker-rejoin-resync/tasks.md
+++ b/.kiro/specs/worker-rejoin-resync/tasks.md
@@ -7,7 +7,7 @@
   - Observable completion: the schema builds cleanly and the new message/opcode/config-field definitions are visible in the generated bindings
   - _Requirements: 2.1, 2.2, 3.5, 3.7, 5.3, 8.1, 8.2, 8.3_
 
-- [ ] 1.2 (P) Add a worker reconciling status and round-tracking state
+- [x] 1.2 (P) Add a worker reconciling status and round-tracking state
   - Add a new worker status value meaning "job-state reconciliation outstanding for this host"
   - Add a per-worker reconciliation-round structure capable of holding a round identifier, the set of queried job IDs, and a deadline
   - Observable completion: the new status value and round structure compile and are reachable from the worker record, unused by any caller yet
diff --git a/src/include/xce/types.h b/src/include/xce/types.h
index 6ef8856b..e7a71f19 100644
--- a/src/include/xce/types.h
+++ b/src/include/xce/types.h
@@ -174,6 +174,7 @@ typedef struct {
 #define XCE_WORKER_CLOSED  (0x00100000)
 #define XCE_WORKER_HIDDEN           (0x00200000) /* Admin explicitly removed — invisible but not yet cleaned up */
 #define XCE_WORKER_CLOSED_BY_ADMIN  (0x00400000) /* Admin closed — host closed explicitly by admin */
+#define XCE_WORKER_RECONCILING      (0x00800000) /* worker-rejoin-resync: job-state reconciliation outstanding for this host (Req 5.1) */
 
 #define IS_WORKER_UNAVAIL(status)         (((status) & XCE_WORKER_UNAVAIL) != 0)
 #define IS_WORKER_LOCKEDU(status)         (((status) & XCE_WORKER_LOCKEDU) != 0)
@@ -182,6 +183,7 @@ typedef struct {
 #define IS_WORKER_LOCKED(status)                                               \
     (IS_WORKER_LOCKEDU(status) || IS_WORKER_LOCKEDW(status))
 #define IS_WORKER_BUSY(status) (((status) & XCE_WORKER_BUSY) != 0)
+#define IS_WORKER_RECONCILING(status)     (((status) & XCE_WORKER_RECONCILING) != 0)
 
 typedef struct {
     char*  hosttype;
@@ -281,12 +283,32 @@ typedef struct {
     double   allocated;
 } xce_res_account_t;
 
+/* worker-rejoin-resync: per-worker job-state reconciliation round. One
+ * resync_state_t per worker_t (worker_t.resync below), absent (NULL) when
+ * no reconciliation is currently outstanding for that worker. Purely
+ * in-memory bookkeeping, not itself persisted -- see design.md's Data
+ * Models / State Management for the full rationale. */
 typedef struct {
-    xce_worker_t host;
-    char         hostkey[XCE_MAXKEY_LEN];
-    endpoint_t*  ep;
-    int          idx;
-    zarray_t     usages;
+    uint64_t  round_token;    /* discards stale/superseded reports (Req 6.3) */
+    int       n_queried_jobids;
+    uint64_t* queried_jobids; /* set semantics (membership-checked, not
+                                * positionally iterated): job IDs queried this
+                                * round; array+count, mirroring
+                                * xce_job_state_query_t.jobids (typemap.h) */
+    uint64_t  deadline;       /* CLOCK_MONOTONIC ms deadline (Req 5.3); same
+                                * representation as delaymgr_t.nextrun_ms
+                                * (delay.h) */
+} resync_state_t;
+
+typedef struct {
+    xce_worker_t     host;
+    char             hostkey[XCE_MAXKEY_LEN];
+    endpoint_t*      ep;
+    int              idx;
+    zarray_t         usages;
+    resync_state_t*  resync; /* worker-rejoin-resync: NULL unless a job-state
+                               * reconciliation round is currently outstanding
+                               * for this worker */
 } worker_t;
 
 typedef struct {