diff --git a/README.md b/README.md
index 79163d2..30274ce 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,3 @@
 # OpenAPI
 
-[![Build Status](https://travis-ci.org/zweidenker/OpenAPI.svg?branch=master)](https://travis-ci.org/zweidenker/OpenAPI)
+[![Build Status](https://github.com/zweidenker/OpenAPI/actions/workflows/build.yml/badge.svg?branch=master)](https://github.com/zweidenker/OpenAPI/actions/workflows/build.yml)
diff --git a/source/OpenAPI-Core-Tests/PetsAPI.class.st b/source/OpenAPI-Core-Tests/PetsAPI.class.st
index 07d4c26..1a464d2 100644
--- a/source/OpenAPI-Core-Tests/PetsAPI.class.st
+++ b/source/OpenAPI-Core-Tests/PetsAPI.class.st
@@ -5,11 +5,6 @@ Class {
 	#package : 'OpenAPI-Core-Tests'
 }
 
-{ #category : 'as yet unclassified' }
-PetsAPI class >> rootCallClass [
-	^ OpenAPICall 
-]
-
 { #category : 'accessing' }
 PetsAPI >> openapi [ 
 	^ '3.0.2'
diff --git a/source/OpenAPI-Core/JSONSchemaArray.extension.st b/source/OpenAPI-Core/JSONSchemaArray.extension.st
index 7f7f523..706954a 100644
--- a/source/OpenAPI-Core/JSONSchemaArray.extension.st
+++ b/source/OpenAPI-Core/JSONSchemaArray.extension.st
@@ -1,8 +1,9 @@
 Extension { #name : 'JSONSchemaArray' }
 
 { #category : '*OpenAPI-Core' }
-JSONSchemaArray >> acceptOpenApi: aVisitor [ 
-	self flag: #todo.
-	"should be recurse into sub elements later"
+JSONSchemaArray >> acceptOpenApi: aVisitor [
+	"See JSONSchemaObject>>acceptOpenApi: - same confirmed-harmless reasoning applies
+	(reached via OAVisitor>>visitComponents:, but only after schemas are already fully
+	resolved via #processSchema: earlier in the same pass)."
 	^ self
 ]
diff --git a/source/OpenAPI-Core/JSONSchemaObject.extension.st b/source/OpenAPI-Core/JSONSchemaObject.extension.st
index 45e2d09..33b1806 100644
--- a/source/OpenAPI-Core/JSONSchemaObject.extension.st
+++ b/source/OpenAPI-Core/JSONSchemaObject.extension.st
@@ -1,8 +1,14 @@
 Extension { #name : 'JSONSchemaObject' }
 
 { #category : '*OpenAPI-Core' }
-JSONSchemaObject >> acceptOpenApi: aVisitor [ 
-	self flag: #todo.
-	"should be recurse into sub elements later"
+JSONSchemaObject >> acceptOpenApi: aVisitor [
+	"Confirmed reached (2026-08-01, traced): OAVisitor>>visitComponents: visits
+	components.schemas' values directly (self visitAll: aComponents schemas), hitting
+	this for every top-level named schema. But by the time that runs, those schemas are
+	already fully resolved - OAReferenceResolveVisitor>>visitOpenApi: converts and
+	resolves them via #processSchema:/JSONSchemaReferenceResolveVisitor earlier in the
+	very same pass, before calling super visitOpenApi: (which is what reaches here).
+	Recursing into sub-elements here would repeat work already done; returning self
+	unchanged is correct given today's call order, not a missing feature."
 	^ self
 ]
diff --git a/source/OpenAPI-REST-Tests/OpenAPIRestPetTests.class.st b/source/OpenAPI-REST-Tests/OpenAPIRestPetTests.class.st
index eaebb94..12f2f74 100644
--- a/source/OpenAPI-REST-Tests/OpenAPIRestPetTests.class.st
+++ b/source/OpenAPI-REST-Tests/OpenAPIRestPetTests.class.st
@@ -10,6 +10,24 @@ OpenAPIRestPetTests >> rootCallClass [
 	^ OpenAPIBasePetCall
 ]
 
+{ #category : 'tests' }
+OpenAPIRestPetTests >> testGetSpecCallReturnsGeneratedDocument [
+	"Regression: OpenAPICall class>>isAbstract only treated the literal OpenAPICall as
+	abstract (not OpenAPIBasePetCall, a shared intermediate base with no #path of its
+	own), and PetsAPI class>>rootCallClass answered the literal OpenAPICall instead of
+	its own OpenAPIBasePetCall root - together, OpenAPI>>buildPaths (via
+	#withAllSubclasses) tried to build a pathItem for OpenAPIBasePetCall itself,
+	crashing with doesNotUnderstand: #path. /spec (OpenAPISpecCall>>get calls
+	PetsAPI new specString) was therefore unreachable."
+	| response |
+	response := self delegate handleRequest: (ZnClient new
+		url: '/spec';
+		method: #GET;
+		prepareRequest) request.
+	self assert: response isSuccess.
+	self assert: (response entity contents includesSubstring: '/pets')
+]
+
 { #category : 'tests' }
 OpenAPIRestPetTests >> testGetPetCall [
 	 
diff --git a/source/OpenAPI-REST-Tests/PetsAPI.extension.st b/source/OpenAPI-REST-Tests/PetsAPI.extension.st
new file mode 100644
index 0000000..36f7147
--- /dev/null
+++ b/source/OpenAPI-REST-Tests/PetsAPI.extension.st
@@ -0,0 +1,11 @@
+Extension { #name : 'PetsAPI' }
+
+{ #category : '*OpenAPI-REST-Tests' }
+PetsAPI class >> rootCallClass [
+	"OpenAPIBasePetCall, not the literal OpenAPICall - the latter is the base of every
+	OpenAPICall subclass in the whole image, not just PetsAPI's own call hierarchy,
+	which made buildPaths (via #withAllSubclasses) pull in unrelated call classes too.
+	Lives as an OpenAPI-REST-Tests extension (not in PetsAPI's own OpenAPI-Core-Tests
+	home package) since OpenAPIBasePetCall is only defined there."
+	^ OpenAPIBasePetCall
+]
diff --git a/source/OpenAPI-REST/OpenAPICall.class.st b/source/OpenAPI-REST/OpenAPICall.class.st
index 11c0348..33afeba 100644
--- a/source/OpenAPI-REST/OpenAPICall.class.st
+++ b/source/OpenAPI-REST/OpenAPICall.class.st
@@ -80,7 +80,12 @@ OpenAPICall class >> implementedMethods [
 
 { #category : 'testing' }
 OpenAPICall class >> isAbstract [
-	^ self = OpenAPICall 
+	"Structural check instead of a literal-class comparison: a class is abstract for
+	URI-space/path-building purposes if it does not (itself or via inheritance) answer a
+	concrete #path - the one thing every real endpoint must define. Catches
+	user-defined intermediate base classes (e.g. OpenAPIBasePetCall), not just the
+	literal OpenAPICall root, which the previous 'self = OpenAPICall' check missed."
+	^ (self respondsTo: #path) not
 ]
 
 { #category : 'testing' }