diff --git a/models/booking/planner/planner.go b/models/booking/planner/planner.go
new file mode 100644
index 0000000..8d83edd
--- /dev/null
+++ b/models/booking/planner/planner.go
@@ -0,0 +1,434 @@
+package planner
+
+import (
+	"encoding/json"
+	"time"
+
+	"cloud.o-forge.io/core/oc-lib/models/booking"
+	"cloud.o-forge.io/core/oc-lib/models/resources"
+	"cloud.o-forge.io/core/oc-lib/tools"
+)
+
+// InstanceCapacity holds the maximum available resources of a single resource instance.
+type InstanceCapacity struct {
+	CPUCores  map[string]float64 `json:"cpu_cores,omitempty"`  // model -> total cores
+	GPUMemGB  map[string]float64 `json:"gpu_mem_gb,omitempty"` // model -> total memory GB
+	RAMGB     float64            `json:"ram_gb,omitempty"`     // total RAM GB
+	StorageGB float64            `json:"storage_gb,omitempty"` // total storage GB
+}
+
+// ResourceRequest describes the resource amounts needed for a prospective booking.
+// A nil map or nil pointer for a dimension means "use the full instance capacity" for that dimension.
+type ResourceRequest struct {
+	CPUCores  map[string]float64 // model -> cores needed   (nil = max)
+	GPUMemGB  map[string]float64 // model -> memory GB needed (nil = max)
+	RAMGB     *float64           // GB needed              (nil = max)
+	StorageGB *float64           // GB needed              (nil = max)
+}
+
+// PlannerSlot represents a single booking occupying a resource instance during a time window.
+// Usage maps each resource dimension (cpu_<model>, gpu_<model>, ram, storage) to
+// its percentage of consumption relative to the instance's maximum capacity (0–100).
+type PlannerSlot struct {
+	Start      time.Time          `json:"start"`
+	End        time.Time          `json:"end"`
+	InstanceID string             `json:"instance_id,omitempty"` // instance targeted by this booking
+	BookingID  string             `json:"booking_id,omitempty"`  // empty in shallow mode
+	Usage      map[string]float64 `json:"usage,omitempty"`       // dimension -> % of max (0-100)
+}
+
+// Planner is a volatile (non-persisted) object that organises bookings by resource.
+// Only ComputeResource and StorageResource bookings appear in the schedule.
+type Planner struct {
+	GeneratedAt time.Time                               `json:"generated_at"`
+	Schedule    map[string][]*PlannerSlot               `json:"schedule"`   // resource_id -> slots
+	Capacities  map[string]map[string]*InstanceCapacity `json:"capacities"` // resource_id -> instance_id -> max capacity
+}
+
+// Generate builds a full Planner from all active bookings.
+// Each slot includes the booking ID, the instance ID, and the usage percentage of every resource dimension.
+func Generate(request *tools.APIRequest) (*Planner, error) {
+	return generate(request, false)
+}
+
+// GenerateShallow builds a Planner from all active bookings without booking IDs.
+func GenerateShallow(request *tools.APIRequest) (*Planner, error) {
+	return generate(request, true)
+}
+
+func generate(request *tools.APIRequest, shallow bool) (*Planner, error) {
+	accessor := booking.NewAccessor(request)
+	bookings, code, err := accessor.Search(nil, "*", false)
+	if code != 200 || err != nil {
+		return nil, err
+	}
+
+	p := &Planner{
+		GeneratedAt: time.Now(),
+		Schedule:    map[string][]*PlannerSlot{},
+		Capacities:  map[string]map[string]*InstanceCapacity{},
+	}
+
+	for _, b := range bookings {
+		bk := b.(*booking.Booking)
+
+		// Only compute and storage resources are eligible
+		if bk.ResourceType != tools.COMPUTE_RESOURCE && bk.ResourceType != tools.STORAGE_RESOURCE {
+			continue
+		}
+
+		end := bk.ExpectedEndDate
+		if end == nil {
+			e := bk.ExpectedStartDate.Add(time.Hour)
+			end = &e
+		}
+
+		instanceID, usage, cap := extractSlotData(bk, request)
+
+		if cap != nil && instanceID != "" {
+			if p.Capacities[bk.ResourceID] == nil {
+				p.Capacities[bk.ResourceID] = map[string]*InstanceCapacity{}
+			}
+			p.Capacities[bk.ResourceID][instanceID] = cap
+		}
+
+		slot := &PlannerSlot{
+			Start:      bk.ExpectedStartDate,
+			End:        *end,
+			InstanceID: instanceID,
+			Usage:      usage,
+		}
+		if !shallow {
+			slot.BookingID = bk.GetID()
+		}
+
+		p.Schedule[bk.ResourceID] = append(p.Schedule[bk.ResourceID], slot)
+	}
+
+	return p, nil
+}
+
+// Check reports whether the requested time window has enough remaining capacity
+// on the specified instance of the given resource.
+//
+// req describes the amounts needed; nil fields default to the full instance capacity.
+// If req itself is nil, the full capacity of every dimension is assumed.
+// If end is nil, a 1-hour window from start is assumed.
+//
+// A slot that overlaps the requested window is acceptable if, for every requested
+// dimension, existing usage + requested usage ≤ 100 %.
+// Slots targeting other instances are ignored.
+// If no capacity is known for this instance (never booked), it is fully available.
+func (p *Planner) Check(resourceID string, instanceID string, req *ResourceRequest, start time.Time, end *time.Time) bool {
+	if end == nil {
+		e := start.Add(time.Hour)
+		end = &e
+	}
+
+	cap := p.instanceCapacity(resourceID, instanceID)
+	reqPct := toPercentages(req, cap)
+
+	slots, ok := p.Schedule[resourceID]
+	if !ok {
+		return true
+	}
+
+	for _, slot := range slots {
+		// Only consider slots on the same instance
+		if slot.InstanceID != instanceID {
+			continue
+		}
+		// Only consider overlapping slots
+		if !slot.Start.Before(*end) || !slot.End.After(start) {
+			continue
+		}
+		// Combined usage must not exceed 100 % for any requested dimension
+		for dim, needed := range reqPct {
+			if slot.Usage[dim]+needed > 100.0 {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+// instanceCapacity returns the stored max capacity for a resource/instance pair.
+// Returns an empty (but non-nil) capacity when the instance has never been booked.
+func (p *Planner) instanceCapacity(resourceID, instanceID string) *InstanceCapacity {
+	if instances, ok := p.Capacities[resourceID]; ok {
+		if c, ok := instances[instanceID]; ok {
+			return c
+		}
+	}
+	return &InstanceCapacity{
+		CPUCores: map[string]float64{},
+		GPUMemGB: map[string]float64{},
+	}
+}
+
+// toPercentages converts a ResourceRequest into a map of dimension -> percentage-of-max.
+// nil fields in req (or nil req) are treated as requesting the full capacity (100 %).
+func toPercentages(req *ResourceRequest, cap *InstanceCapacity) map[string]float64 {
+	pct := map[string]float64{}
+
+	if req == nil {
+		for model := range cap.CPUCores {
+			pct["cpu_"+model] = 100.0
+		}
+		for model := range cap.GPUMemGB {
+			pct["gpu_"+model] = 100.0
+		}
+		if cap.RAMGB > 0 {
+			pct["ram"] = 100.0
+		}
+		if cap.StorageGB > 0 {
+			pct["storage"] = 100.0
+		}
+		return pct
+	}
+
+	if req.CPUCores == nil {
+		for model, maxCores := range cap.CPUCores {
+			if maxCores > 0 {
+				pct["cpu_"+model] = 100.0
+			}
+		}
+	} else {
+		for model, needed := range req.CPUCores {
+			if maxCores, ok := cap.CPUCores[model]; ok && maxCores > 0 {
+				pct["cpu_"+model] = (needed / maxCores) * 100.0
+			}
+		}
+	}
+
+	if req.GPUMemGB == nil {
+		for model, maxMem := range cap.GPUMemGB {
+			if maxMem > 0 {
+				pct["gpu_"+model] = 100.0
+			}
+		}
+	} else {
+		for model, needed := range req.GPUMemGB {
+			if maxMem, ok := cap.GPUMemGB[model]; ok && maxMem > 0 {
+				pct["gpu_"+model] = (needed / maxMem) * 100.0
+			}
+		}
+	}
+
+	if req.RAMGB == nil {
+		if cap.RAMGB > 0 {
+			pct["ram"] = 100.0
+		}
+	} else if cap.RAMGB > 0 {
+		pct["ram"] = (*req.RAMGB / cap.RAMGB) * 100.0
+	}
+
+	if req.StorageGB == nil {
+		if cap.StorageGB > 0 {
+			pct["storage"] = 100.0
+		}
+	} else if cap.StorageGB > 0 {
+		pct["storage"] = (*req.StorageGB / cap.StorageGB) * 100.0
+	}
+
+	return pct
+}
+
+// ---------------------------------------------------------------------------
+// Internal helpers
+// ---------------------------------------------------------------------------
+
+// extractSlotData parses the booking's PricedItem, loads the corresponding resource,
+// and returns the instance ID, usage percentages, and instance capacity in a single pass.
+func extractSlotData(bk *booking.Booking, request *tools.APIRequest) (instanceID string, usage map[string]float64, cap *InstanceCapacity) {
+	usage = map[string]float64{}
+	if len(bk.PricedItem) == 0 {
+		return
+	}
+
+	b, err := json.Marshal(bk.PricedItem)
+	if err != nil {
+		return
+	}
+
+	switch bk.ResourceType {
+	case tools.COMPUTE_RESOURCE:
+		instanceID, usage, cap = extractComputeSlot(b, bk.ResourceID, request)
+	case tools.STORAGE_RESOURCE:
+		instanceID, usage, cap = extractStorageSlot(b, bk.ResourceID, request)
+	}
+	return
+}
+
+// extractComputeSlot extracts the instance ID, usage percentages, and max capacity for a compute booking.
+// Keys in usage: "cpu_<model>", "gpu_<model>", "ram".
+func extractComputeSlot(pricedJSON []byte, resourceID string, request *tools.APIRequest) (instanceID string, usage map[string]float64, cap *InstanceCapacity) {
+	usage = map[string]float64{}
+
+	var priced resources.PricedComputeResource
+	if err := json.Unmarshal(pricedJSON, &priced); err != nil {
+		return
+	}
+
+	res, _, err := (&resources.ComputeResource{}).GetAccessor(request).LoadOne(resourceID)
+	if err != nil {
+		return
+	}
+	compute := res.(*resources.ComputeResource)
+
+	instance := findComputeInstance(compute, priced.InstancesRefs)
+	if instance == nil {
+		return
+	}
+	instanceID = instance.GetID()
+
+	// Build the instance's maximum capacity
+	cap = &InstanceCapacity{
+		CPUCores: map[string]float64{},
+		GPUMemGB: map[string]float64{},
+		RAMGB:    totalRAM(instance),
+	}
+	for model := range instance.CPUs {
+		cap.CPUCores[model] = totalCPUCores(instance, model)
+	}
+	for model := range instance.GPUs {
+		cap.GPUMemGB[model] = totalGPUMemory(instance, model)
+	}
+
+	// Compute usage as a percentage of the instance's maximum capacity
+	for model, usedCores := range priced.CPUsLocated {
+		if maxCores := cap.CPUCores[model]; maxCores > 0 {
+			usage["cpu_"+model] = (usedCores / maxCores) * 100.0
+		}
+	}
+	for model, usedMem := range priced.GPUsLocated {
+		if maxMem := cap.GPUMemGB[model]; maxMem > 0 {
+			usage["gpu_"+model] = (usedMem / maxMem) * 100.0
+		}
+	}
+	if cap.RAMGB > 0 && priced.RAMLocated > 0 {
+		usage["ram"] = (priced.RAMLocated / cap.RAMGB) * 100.0
+	}
+
+	return
+}
+
+// extractStorageSlot extracts the instance ID, usage percentages, and max capacity for a storage booking.
+// Key in usage: "storage".
+func extractStorageSlot(pricedJSON []byte, resourceID string, request *tools.APIRequest) (instanceID string, usage map[string]float64, cap *InstanceCapacity) {
+	usage = map[string]float64{}
+
+	var priced resources.PricedStorageResource
+	if err := json.Unmarshal(pricedJSON, &priced); err != nil {
+		return
+	}
+
+	res, _, err := (&resources.StorageResource{}).GetAccessor(request).LoadOne(resourceID)
+	if err != nil {
+		return
+	}
+	storage := res.(*resources.StorageResource)
+
+	instance := findStorageInstance(storage, priced.InstancesRefs)
+	if instance == nil {
+		return
+	}
+	instanceID = instance.GetID()
+
+	maxStorage := float64(instance.SizeGB)
+	cap = &InstanceCapacity{
+		CPUCores:  map[string]float64{},
+		GPUMemGB:  map[string]float64{},
+		StorageGB: maxStorage,
+	}
+	if maxStorage > 0 && priced.UsageStorageGB > 0 {
+		usage["storage"] = (priced.UsageStorageGB / maxStorage) * 100.0
+	}
+
+	return
+}
+
+// findComputeInstance returns the instance referenced by the priced item's InstancesRefs,
+// falling back to the first available instance.
+func findComputeInstance(compute *resources.ComputeResource, refs map[string]string) *resources.ComputeResourceInstance {
+	for _, inst := range compute.Instances {
+		if _, ok := refs[inst.GetID()]; ok {
+			return inst
+		}
+	}
+	if len(compute.Instances) > 0 {
+		return compute.Instances[0]
+	}
+	return nil
+}
+
+// findStorageInstance returns the instance referenced by the priced item's InstancesRefs,
+// falling back to the first available instance.
+func findStorageInstance(storage *resources.StorageResource, refs map[string]string) *resources.StorageResourceInstance {
+	for _, inst := range storage.Instances {
+		if _, ok := refs[inst.GetID()]; ok {
+			return inst
+		}
+	}
+	if len(storage.Instances) > 0 {
+		return storage.Instances[0]
+	}
+	return nil
+}
+
+// totalCPUCores returns the total number of cores for a given CPU model across all nodes.
+// It multiplies the per-chip core count (from the instance's CPU spec) by the total
+// number of chips of that model across all nodes (chip_count × node.Quantity).
+// Falls back to the spec's core count if no nodes are defined.
+func totalCPUCores(instance *resources.ComputeResourceInstance, model string) float64 {
+	spec, ok := instance.CPUs[model]
+	if !ok || spec == nil || spec.Cores == 0 {
+		return 0
+	}
+	if len(instance.Nodes) == 0 {
+		return float64(spec.Cores)
+	}
+	totalChips := int64(0)
+	for _, node := range instance.Nodes {
+		if chipCount, ok := node.CPUs[model]; ok {
+			totalChips += chipCount * max(node.Quantity, 1)
+		}
+	}
+	if totalChips == 0 {
+		return float64(spec.Cores)
+	}
+	return float64(totalChips * int64(spec.Cores))
+}
+
+// totalGPUMemory returns the total GPU memory (GB) for a given model across all nodes.
+// Falls back to the spec's memory if no nodes are defined.
+func totalGPUMemory(instance *resources.ComputeResourceInstance, model string) float64 {
+	spec, ok := instance.GPUs[model]
+	if !ok || spec == nil || spec.MemoryGb == 0 {
+		return 0
+	}
+	if len(instance.Nodes) == 0 {
+		return spec.MemoryGb
+	}
+	totalUnits := int64(0)
+	for _, node := range instance.Nodes {
+		if unitCount, ok := node.GPUs[model]; ok {
+			totalUnits += unitCount * max(node.Quantity, 1)
+		}
+	}
+	if totalUnits == 0 {
+		return spec.MemoryGb
+	}
+	return float64(totalUnits) * spec.MemoryGb
+}
+
+// totalRAM returns the total RAM (GB) across all nodes of a compute instance.
+func totalRAM(instance *resources.ComputeResourceInstance) float64 {
+	total := float64(0)
+	for _, node := range instance.Nodes {
+		if node.RAM != nil && node.RAM.SizeGb > 0 {
+			total += node.RAM.SizeGb * float64(max(node.Quantity, 1))
+		}
+	}
+	return total
+}
diff --git a/tools/nats_caller.go b/tools/nats_caller.go
index 70745f2..ef22a12 100644
--- a/tools/nats_caller.go
+++ b/tools/nats_caller.go
@@ -27,7 +27,7 @@ type NATSMethod int
 
 var meths = []string{"remove execution", "create execution", "discovery",
 	"workflow event", "create resource", "remove resource",
-	"propalgation event", "catalog search event",
+	"propalgation event", "search event", "get planner",
 }
 
 const (
@@ -40,7 +40,8 @@ const (
 	REMOVE_RESOURCE
 
 	PROPALGATION_EVENT
-	CATALOG_SEARCH_EVENT
+	SEARCH_EVENT
+	PLANNER_EVENT
 )
 
 func (n NATSMethod) String() string {
@@ -50,7 +51,7 @@ func (n NATSMethod) String() string {
 // NameToMethod returns the NATSMethod enum value from a string
 func NameToMethod(name string) NATSMethod {
 	for _, v := range [...]NATSMethod{REMOVE_EXECUTION, CREATE_EXECTUTION, DISCOVERY, WORKFLOW_EVENT,
-		CREATE_RESOURCE, REMOVE_RESOURCE, PROPALGATION_EVENT, CATALOG_SEARCH_EVENT} {
+		CREATE_RESOURCE, REMOVE_RESOURCE, PROPALGATION_EVENT, SEARCH_EVENT, PLANNER_EVENT} {
 		if strings.Contains(strings.ToLower(v.String()), strings.ToLower(name)) {
 			return v
 		}