diff --git a/contracts/go/seats/meshpipelinerunner/contract.go b/contracts/go/seats/meshpipelinerunner/contract.go
index 9be24bfd..7b0bfe66 100644
--- a/contracts/go/seats/meshpipelinerunner/contract.go
+++ b/contracts/go/seats/meshpipelinerunner/contract.go
@@ -522,6 +522,7 @@ const (
 
 // The values of PipelineStartedStepsItem's step.
 const (
+	PipelineStartedStepsItemStepBuild       = "build"
 	PipelineStartedStepsItemStepLint        = "lint"
 	PipelineStartedStepsItemStepUnit        = "unit"
 	PipelineStartedStepsItemStepIntegration = "integration"
@@ -820,6 +821,7 @@ type WhyCarriedInput struct {
 
 // The values of WhyCarriedInput's step.
 const (
+	WhyCarriedInputStepBuild       = "build"
 	WhyCarriedInputStepLint        = "lint"
 	WhyCarriedInputStepUnit        = "unit"
 	WhyCarriedInputStepIntegration = "integration"
@@ -881,6 +883,7 @@ type RerunInput struct {
 
 // The values of RerunInput's step.
 const (
+	RerunInputStepBuild       = "build"
 	RerunInputStepLint        = "lint"
 	RerunInputStepUnit        = "unit"
 	RerunInputStepIntegration = "integration"
@@ -907,6 +910,7 @@ type AcceptInput struct {
 
 // The values of AcceptInput's step.
 const (
+	AcceptInputStepBuild       = "build"
 	AcceptInputStepLint        = "lint"
 	AcceptInputStepUnit        = "unit"
 	AcceptInputStepIntegration = "integration"
diff --git a/contracts/seats/mesh-pipeline-runner/seat.json b/contracts/seats/mesh-pipeline-runner/seat.json
index 10734bbb..01778d80 100644
--- a/contracts/seats/mesh-pipeline-runner/seat.json
+++ b/contracts/seats/mesh-pipeline-runner/seat.json
@@ -215,6 +215,7 @@
           "step": {
             "type": "string",
             "enum": [
+              "build",
               "lint",
               "unit",
               "integration",
@@ -347,6 +348,7 @@
           "step": {
             "type": "string",
             "enum": [
+              "build",
               "lint",
               "unit",
               "integration",
@@ -398,6 +400,7 @@
           "step": {
             "type": "string",
             "enum": [
+              "build",
               "lint",
               "unit",
               "integration",
@@ -1157,6 +1160,7 @@
               "step": {
                 "type": "string",
                 "enum": [
+                  "build",
                   "lint",
                   "unit",
                   "integration",
diff --git a/contracts/ts/seats/meshpipelinerunner/index.d.ts b/contracts/ts/seats/meshpipelinerunner/index.d.ts
index bff695ca..73c3dcb1 100644
--- a/contracts/ts/seats/meshpipelinerunner/index.d.ts
+++ b/contracts/ts/seats/meshpipelinerunner/index.d.ts
@@ -251,7 +251,7 @@ export interface PipelineEnded {
 export interface PipelineStartedStepsItem {
   "artifact"?: string;
   "status": "required" | "optional" | "bypass";
-  "step": "lint" | "unit" | "integration" | "composition" | "review" | "approval";
+  "step": "build" | "lint" | "unit" | "integration" | "composition" | "review" | "approval";
 }
 
 /** a pipeline's start */
@@ -474,7 +474,7 @@ export interface WhyCarriedInput {
   "artifact"?: string;
   /** the pipeline's key */
   "pipeline": string;
-  "step": "lint" | "unit" | "integration" | "composition" | "review" | "approval";
+  "step": "build" | "lint" | "unit" | "integration" | "composition" | "review" | "approval";
 }
 
 /** is what why-carried answers. */
@@ -517,7 +517,7 @@ export interface RerunInput {
   "artifact"?: string;
   /** the pipeline's key */
   "pipeline": string;
-  "step": "lint" | "unit" | "integration" | "composition" | "review" | "approval";
+  "step": "build" | "lint" | "unit" | "integration" | "composition" | "review" | "approval";
   /** why, written with the caller the runtime proves in the hand-act log */
   "why": string;
 }
@@ -533,7 +533,7 @@ export interface AcceptInput {
   "artifact"?: string;
   /** the pipeline's key */
   "pipeline": string;
-  "step": "lint" | "unit" | "integration" | "composition" | "review" | "approval";
+  "step": "build" | "lint" | "unit" | "integration" | "composition" | "review" | "approval";
   /** why, written with the caller the runtime proves in the hand-act log */
   "why": string;
 }
diff --git a/modules/mesh-delivery-pipeline/manifest_test.go b/modules/mesh-delivery-pipeline/manifest_test.go
index 7d3bf590..ed457e40 100644
--- a/modules/mesh-delivery-pipeline/manifest_test.go
+++ b/modules/mesh-delivery-pipeline/manifest_test.go
@@ -71,7 +71,10 @@ func TestManifest(t *testing.T) {
 			// RN3 (§53, §334): a publication's dependents behind.
 			"seat:mesh-catalog.outdated",
 			// A-74, A-89: who holds the seat operator-channel, whose state asks holds the router's record of the approval ask.
-			"seat:mesh-module-assigner.assignments"})},
+			"seat:mesh-module-assigner.assignments",
+			// A-102 (§22, §24): the accepted kinds the runner puts its steps on.
+			"seat:mesh-builds.step", "seat:mesh-wants.step", "seat:node-build-go.check.step", "seat:node-build-node.check.step",
+			"seat:node-build-image.check.step"})},
 		{"uses operator-channel", equalSets(m.Uses, []string{"operator-channel"})},
 		{"first-view tools", equalSets(m.Tools, []string{"pipeline_first_views", "pipeline_first_view_again"})},
 		// RN1/AC5 (§95, §130): the new assigner is delivered before the runner.
diff --git a/modules/mesh-delivery-pipeline/module.json b/modules/mesh-delivery-pipeline/module.json
index b51b9a70..5ead274a 100644
--- a/modules/mesh-delivery-pipeline/module.json
+++ b/modules/mesh-delivery-pipeline/module.json
@@ -45,7 +45,12 @@
     "seat:mesh-catalog.revision",
     "seat:mesh-hand-acts.hand-act",
     "seat:mesh-catalog.outdated",
-    "seat:mesh-module-assigner.assignments"
+    "seat:mesh-module-assigner.assignments",
+    "seat:mesh-builds.step",
+    "seat:mesh-wants.step",
+    "seat:node-build-go.check.step",
+    "seat:node-build-node.check.step",
+    "seat:node-build-image.check.step"
   ],
   "uses": [
     "operator-channel"