diff --git a/src/create.js b/src/create.js
index 6bf3f0a..2147e27 100644
--- a/src/create.js
+++ b/src/create.js
@@ -78,7 +78,7 @@ async function main() {
 
   // options for site
   .option('--import-site <char>', 'URL of site to import')
-  .option('--import-structure <char>', `import method to use:\n\rpressbooksToSite\n\relmslnToSite\n\rhaxcmsToSite\n\rnotionToSite\n\rgitbookToSite\n\revolutionToSite\n\rploneToSite\n\rwordpressPagesToSite\n\rdrupalBookToSite\n\rhtmlToSite\n\rdocxToSite`)
+  .option('--import-structure <char>', `import method to use:\n\rpressbooksToSite\n\relmslnToSite\n\rhaxcmsToSite\n\rnotionToSite\n\rgitbookToSite\n\revolutionToSite\n\rploneToSite\n\rwordpressPagesToSite\n\rdrupalBookToSite\n\ropenstaxToSite\n\rhtmlToSite\n\rdocxToSite\n\rxlsxToSite`)
   .option('--node-op <char>', 'node operation to perform')
   .option('--item-id <char>', 'node ID to operate on')
   .option('--domain <char>', 'published domain name')
@@ -192,7 +192,7 @@ async function main() {
   .option('--root <char>', 'root location to execute the command from')
 
   .option('--import-site <char>', 'URL of site to import')
-  .option('--import-structure <char>', `import method to use:\n\rpressbooksToSite\n\relmslnToSite\n\rhaxcmsToSite\n\rnotionToSite\n\rgitbookToSite\n\revolutionToSite\n\rploneToSite\n\rwordpressPagesToSite\n\rdrupalBookToSite\n\rhtmlToSite\n\rdocxToSite`)
+  .option('--import-structure <char>', `import method to use:\n\rpressbooksToSite\n\relmslnToSite\n\rhaxcmsToSite\n\rnotionToSite\n\rgitbookToSite\n\revolutionToSite\n\rploneToSite\n\rwordpressPagesToSite\n\rdrupalBookToSite\n\ropenstaxToSite\n\rhtmlToSite\n\rdocxToSite\n\rxlsxToSite`)
   .option('--name <char>', 'name of the site (when creating a new one)')
   .option('--domain <char>', 'published domain name')
   .option('--node-op <char>', 'node operation to perform')
diff --git a/src/docs/hax.1 b/src/docs/hax.1
index ad6e9cd..00e1848 100644
--- a/src/docs/hax.1
+++ b/src/docs/hax.1
@@ -225,9 +225,13 @@ wordpressPagesToSite
 .br
 drupalBookToSite
 .br
+openstaxToSite
+.br
 htmlToSite
 .br
 docxToSite
+.br
+xlsxToSite
 .TP
 \--node\-op <char>
 node operation to perform
diff --git a/src/lib/programs/site.js b/src/lib/programs/site.js
index 6b38b8a..88295af 100644
--- a/src/lib/programs/site.js
+++ b/src/lib/programs/site.js
@@ -182,7 +182,7 @@ async function invokeRoute(routeHandler, body = {}, query = {}, params = {}) {
 // converters go through the site/import/:platform dispatcher; docx/xlsx use their
 // own actions routes. evolutionToSite (custom zip upload) is intentionally absent
 // and falls through to the hidden-methodologies branch below.
-const IMPORT_STRUCTURE_MAP = {
+export const IMPORT_STRUCTURE_MAP = {
   haxcmsToSite: { platform: 'haxcms' },
   pressbooksToSite: { platform: 'pressbooks' },
   gitbookToSite: { platform: 'gitbook' },
@@ -191,6 +191,7 @@ const IMPORT_STRUCTURE_MAP = {
   ploneToSite: { platform: 'plone' },
   wordpressPagesToSite: { platform: 'wordpress' },
   drupalBookToSite: { platform: 'drupal-book' },
+  openstaxToSite: { platform: 'openstax' },
   htmlToSite: { platform: 'html' },
   docxToSite: { routeKey: 'actions/import-docx' },
   xlsxToSite: { routeKey: 'actions/import-xlsx' },
diff --git a/test/unit/site-imports.test.cjs b/test/unit/site-imports.test.cjs
new file mode 100644
index 0000000..51981d9
--- /dev/null
+++ b/test/unit/site-imports.test.cjs
@@ -0,0 +1,66 @@
+'use strict'
+
+// Isolate HOME BEFORE requiring site.js (via the canary) so HAXCMS init lands in
+// a temp dir, not the real ~/.haxtheweb. Same pattern as site-helpers-2.test.cjs.
+const fs = require('node:fs')
+const os = require('node:os')
+const path = require('node:path')
+const ISOLATED_HOME = fs.mkdtempSync(path.join(os.tmpdir(), 'hax-site-imports-'))
+process.env.HOME = ISOLATED_HOME
+process.env.USERPROFILE = ISOLATED_HOME
+
+const test = require('node:test')
+const assert = require('node:assert/strict')
+
+const { available, skipReason, module: siteModule } = require('../_helpers/site-canary.cjs')
+
+const { IMPORT_STRUCTURE_MAP } = available ? siteModule : {}
+
+const opts = { skip: skipReason, timeout: 15000 }
+
+// --- IMPORT_STRUCTURE_MAP ---
+// --import-structure names resolve to on-prem haxcms-nodejs routes: platform
+// converters through the site/import/:platform dispatcher, docx/xlsx through
+// their own actions routes. A converter missing from this map is unreachable
+// from the CLI even when the backend route exists, which is what happened to
+// the OpenStax importer from haxtheweb/issues#2912.
+
+test('every platform importer maps to its dispatcher platform', opts, () => {
+  const platforms = {}
+  Object.keys(IMPORT_STRUCTURE_MAP).forEach((name) => {
+    if (IMPORT_STRUCTURE_MAP[name].platform) {
+      platforms[name] = IMPORT_STRUCTURE_MAP[name].platform
+    }
+  })
+  assert.deepEqual(platforms, {
+    haxcmsToSite: 'haxcms',
+    pressbooksToSite: 'pressbooks',
+    gitbookToSite: 'gitbook',
+    notionToSite: 'notion',
+    elmslnToSite: 'elmsln',
+    ploneToSite: 'plone',
+    wordpressPagesToSite: 'wordpress',
+    drupalBookToSite: 'drupal-book',
+    openstaxToSite: 'openstax',
+    htmlToSite: 'html',
+  })
+})
+
+test('openstaxToSite reaches the openstax dispatcher case', opts, () => {
+  assert.deepEqual(IMPORT_STRUCTURE_MAP.openstaxToSite, { platform: 'openstax' })
+})
+
+test('docx and xlsx keep their own action routes', opts, () => {
+  assert.deepEqual(IMPORT_STRUCTURE_MAP.docxToSite, { routeKey: 'actions/import-docx' })
+  assert.deepEqual(IMPORT_STRUCTURE_MAP.xlsxToSite, { routeKey: 'actions/import-xlsx' })
+})
+
+test('the --import-structure help and man page list every mapped importer', opts, () => {
+  const root = path.join(__dirname, '..', '..')
+  const help = fs.readFileSync(path.join(root, 'src', 'create.js'), 'utf8')
+  const manPage = fs.readFileSync(path.join(root, 'src', 'docs', 'hax.1'), 'utf8')
+  Object.keys(IMPORT_STRUCTURE_MAP).forEach((name) => {
+    assert.ok(help.includes(name), name + ' is offered by --import-structure')
+    assert.ok(manPage.includes(name), name + ' is documented in the man page')
+  })
+})