@@ -171,6 +171,25 @@ The document must be **OpenAPI 3.x**. A Swagger 2.0 document — or one with no
 document, URL or file it came from: convert it to OpenAPI 3.x offline and point
 `spec` at the converted document. The runtime never converts.
 
+The ObjectStack repository carries that offline step as a script (it is not
+shipped in the npm package): `normalize-openapi` reads a file or URL, JSON or
+YAML, converts Swagger 2.0 to OpenAPI 3.0, bundles and inlines every `$ref`,
+makes `servers[0].url` absolute, writes one JSON document and prints its
+sha256 — and, given allow-patterns, the `include` list for the operations they
+match.
+
+```bash
+pnpm --filter @objectstack/connector-openapi normalize-openapi \
+  --in https://example.com/openapi.yaml --out ./specs/crm-openapi.json \
+  --include-pattern '^GET /v1/customers'
+```
+
+Inlining is bounded: a recursive schema, or one more than `--max-depth`
+(default 2) named schemas deep, becomes a typed stub whose description names
+the reference it replaced. A Swagger 2.0 operation whose empty `consumes` list
+would drop its request body is refused until `--empty-consumes <media type>`
+says which media type it accepts.
+
 ### `provider: 'mcp'` — one action per tool
 
 Config: **`transport`** (required) and **`include`** (optional tool-name
 
@@ -23,15 +23,18 @@
         "build": "tsup --config ../../../tsup.config.ts && node ../../../scripts/check-dts-emitted.mjs",
         "check:test-typecheck": "tsx ../../../scripts/check-test-typecheck.mts --self-test && tsx ../../../scripts/check-test-typecheck.mts --package packages/connectors/connector-openapi --project tsconfig.test.json",
         "gen:test-typecheck-debt": "tsx ../../../scripts/check-test-typecheck.mts --update --package packages/connectors/connector-openapi --project tsconfig.test.json",
+        "normalize-openapi": "tsx scripts/normalize-openapi.mts",
         "test": "vitest run --passWithNoTests",
-        "typecheck": "tsc --noEmit && pnpm check:test-typecheck"
+        "typecheck": "tsc --noEmit && tsc --noEmit -p tsconfig.scripts.json && pnpm check:test-typecheck"
     },
     "dependencies": {
         "@objectstack/core": "workspace:*",
         "@objectstack/spec": "workspace:*"
     },
     "devDependencies": {
         "@objectstack/service-automation": "workspace:*",
+        "@scalar/json-magic": "^0.17.0",
+        "@scalar/openapi-upgrader": "^0.4.6",
         "@types/node": "^26.6.5",
         "typescript": "^6.0.3",
         "vitest": "^4.1.11"
 
@@ -0,0 +1,18 @@
+# The second file of the openapi3-billing-shape fixture: reached only by an
+# external $ref, so the bundler has to load it.
+components:
+  schemas:
+    balance:
+      type: object
+      properties:
+        available:
+          type: array
+          items:
+            $ref: '#/components/schemas/money'
+    money:
+      type: object
+      properties:
+        amount:
+          type: integer
+        currency:
+          type: string
@@ -0,0 +1,139 @@
+# Shaped like Stripe's spec3 document, trimmed: OpenAPI 3.0 in YAML, component
+# schemas that refer to each other (customer <-> subscription is recursive), a
+# vendor extension carrying $refs, a shared default error response, a shared
+# parameter, and one schema in a second file reached by an external $ref.
+openapi: 3.0.0
+info:
+  title: Billing API (trimmed fixture)
+  version: '2026-10-01'
+servers:
+  - url: https://api.example.com/
+paths:
+  /v1/customers:
+    get:
+      operationId: GetCustomers
+      summary: List customers
+      parameters:
+        - $ref: '#/components/parameters/limit'
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  data:
+                    type: array
+                    items:
+                      $ref: '#/components/schemas/customer'
+        default:
+          $ref: '#/components/responses/error'
+    post:
+      operationId: PostCustomers
+      summary: Create a customer
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/customer_create'
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/customer'
+        default:
+          $ref: '#/components/responses/error'
+  /v1/customers/{customer}:
+    get:
+      operationId: GetCustomersCustomer
+      parameters:
+        - name: customer
+          in: path
+          required: true
+          schema:
+            type: string
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/customer'
+  /v1/balance:
+    get:
+      summary: Retrieve the balance (no operationId -- keyed get_v1_balance)
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: './billing-shared.yaml#/components/schemas/balance'
+components:
+  parameters:
+    limit:
+      name: limit
+      in: query
+      required: false
+      schema:
+        type: integer
+  responses:
+    error:
+      description: Error response.
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/error'
+  schemas:
+    customer:
+      type: object
+      description: A customer.
+      properties:
+        id:
+          type: string
+        default:
+          description: A property NAMED default is a schema, not a literal.
+          $ref: '#/components/schemas/address'
+        subscriptions:
+          type: array
+          items:
+            $ref: '#/components/schemas/subscription'
+    subscription:
+      type: object
+      description: A subscription.
+      properties:
+        id:
+          type: string
+        customer:
+          anyOf:
+            - type: string
+            - $ref: '#/components/schemas/customer'
+          x-expansionResources:
+            oneOf:
+              - $ref: '#/components/schemas/customer'
+    customer_create:
+      type: object
+      properties:
+        email:
+          type: string
+          default: someone@example.com
+        address:
+          $ref: '#/components/schemas/address'
+    address:
+      type: object
+      properties:
+        city:
+          type: string
+    error:
+      type: object
+      properties:
+        message:
+          type: string
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
@@ -0,0 +1,103 @@
+{
+  "swagger": "2.0",
+  "info": {
+    "title": "Envelope API (trimmed fixture)",
+    "version": "2.1",
+    "description": "Shaped like DocuSign's eSignature Swagger 2.0 document: host + basePath + schemes, every operation's parameters and an operation-level empty consumes list, definitions reached through $ref (one of them recursive)."
+  },
+  "host": "api.example.com",
+  "basePath": "/restapi",
+  "schemes": ["https"],
+  "consumes": ["application/json"],
+  "produces": ["application/json"],
+  "paths": {
+    "/v2.1/accounts/{accountId}/envelopes": {
+      "parameters": [],
+      "post": {
+        "operationId": "Envelopes_PostEnvelopes",
+        "summary": "Create an envelope",
+        "consumes": [],
+        "produces": [],
+        "parameters": [
+          { "name": "accountId", "in": "path", "required": true, "type": "string", "description": "The account ID." },
+          { "name": "merge_roles_on_draft", "in": "query", "required": false, "type": "string" },
+          { "name": "envelopeDefinition", "in": "body", "required": true, "schema": { "$ref": "#/definitions/envelopeDefinition" } }
+        ],
+        "responses": {
+          "201": { "description": "Created", "schema": { "$ref": "#/definitions/envelopeSummary" } },
+          "400": { "description": "Error", "schema": { "$ref": "#/definitions/errorDetails" } }
+        }
+      },
+      "get": {
+        "operationId": "Envelopes_GetEnvelopes",
+        "summary": "List envelopes",
+        "consumes": [],
+        "produces": [],
+        "parameters": [
+          { "name": "accountId", "in": "path", "required": true, "type": "string" },
+          { "name": "from_date", "in": "query", "required": false, "type": "string" }
+        ],
+        "responses": {
+          "200": { "description": "OK", "schema": { "$ref": "#/definitions/envelopesInformation" } }
+        }
+      }
+    },
+    "/v2.1/accounts/{accountId}/envelopes/{envelopeId}": {
+      "get": {
+        "operationId": "Envelopes_GetEnvelope",
+        "summary": "Get an envelope",
+        "parameters": [
+          { "name": "accountId", "in": "path", "required": true, "type": "string" },
+          { "name": "envelopeId", "in": "path", "required": true, "type": "string" }
+        ],
+        "responses": {
+          "200": { "description": "OK", "schema": { "$ref": "#/definitions/envelope" } }
+        }
+      }
+    }
+  },
+  "definitions": {
+    "envelopeDefinition": {
+      "type": "object",
+      "description": "The envelope to create.",
+      "properties": {
+        "emailSubject": { "type": "string" },
+        "status": { "type": "string", "enum": ["created", "sent"] },
+        "recipients": { "$ref": "#/definitions/recipients" }
+      }
+    },
+    "recipients": {
+      "type": "object",
+      "properties": {
+        "signers": { "type": "array", "items": { "$ref": "#/definitions/signer" } }
+      }
+    },
+    "signer": {
+      "type": "object",
+      "properties": {
+        "email": { "type": "string" },
+        "name": { "type": "string" }
+      }
+    },
+    "envelopeSummary": {
+      "type": "object",
+      "properties": { "envelopeId": { "type": "string" }, "status": { "type": "string" } }
+    },
+    "envelopesInformation": {
+      "type": "object",
+      "properties": { "envelopes": { "type": "array", "items": { "$ref": "#/definitions/envelope" } } }
+    },
+    "envelope": {
+      "type": "object",
+      "description": "An envelope.",
+      "properties": {
+        "envelopeId": { "type": "string" },
+        "parentEnvelope": { "$ref": "#/definitions/envelope" }
+      }
+    },
+    "errorDetails": {
+      "type": "object",
+      "properties": { "errorCode": { "type": "string" }, "message": { "type": "string" } }
+    }
+  }
+}