diff --git a/services/framecache/src/slot.h b/services/framecache/src/slot.h
index 32ee54f..a1bfde0 100644
--- a/services/framecache/src/slot.h
+++ b/services/framecache/src/slot.h
@@ -68,6 +68,19 @@ typedef struct {
 _Static_assert(sizeof(fc_frame_t) == FC_FRAME_HDR_SIZE,
                "fc_frame_t header must be exactly FC_FRAME_HDR_SIZE bytes");
 
+/* Function declarations */
+struct fc_slot *fc_slot_create(const char *slot_id,
+                                uint32_t width, uint32_t height,
+                                uint32_t fps_num, uint32_t fps_den,
+                                uint32_t pixel_format,
+                                const char *source_type);
+void fc_slot_destroy(struct fc_slot *s);
+struct fc_slot *fc_slot_open(const char *slot_id);
+void fc_slot_close(struct fc_slot *s);
+void fc_slot_write_frame(struct fc_slot *s,
+                          const uint8_t *data, uint32_t size,
+                          uint64_t pts_us);
+
 /* Accessor functions — inline now that struct fc_slot is defined above */
 static inline fc_header_t *fc_slot_header(struct fc_slot *s) { return (fc_header_t *)s->base; }
 static inline const char  *fc_slot_id(struct fc_slot *s)     { return s->slot_id; }