diff --git a/containers/api-proxy/providers/index.js b/containers/api-proxy/providers/index.js
index d027dd92e..b8e557de8 100644
--- a/containers/api-proxy/providers/index.js
+++ b/containers/api-proxy/providers/index.js
@@ -14,6 +14,14 @@ const { createAnthropicAdapter } = require('./anthropic');
 const { createCopilotAdapter } = require('./copilot');
 const { GOOGLE_PROVIDER_ADAPTER_FACTORIES } = require('./google-adapter');
 
+const PROVIDER_ADAPTER_FACTORIES = [
+  [createOpenAIAdapter, 'openaiBodyTransform'],
+  [createAnthropicAdapter, 'anthropicBodyTransform'],
+  [createCopilotAdapter, 'copilotBodyTransform'],
+  [GOOGLE_PROVIDER_ADAPTER_FACTORIES.gemini, 'geminiBodyTransform'],
+  [GOOGLE_PROVIDER_ADAPTER_FACTORIES.vertex, 'vertexBodyTransform'],
+];
+
 /**
  * @typedef {Object} ProbeConfig
  * @property {string} url - URL to probe
@@ -100,13 +108,8 @@ const { GOOGLE_PROVIDER_ADAPTER_FACTORIES } = require('./google-adapter');
  * @returns {ProviderAdapter[]}
  */
 function createAllAdapters(env, deps = {}) {
-  const openai    = createOpenAIAdapter(env,    { bodyTransform: deps.openaiBodyTransform    || null });
-  const anthropic = createAnthropicAdapter(env, { bodyTransform: deps.anthropicBodyTransform || null });
-  const copilot   = createCopilotAdapter(env,   { bodyTransform: deps.copilotBodyTransform   || null });
-  const gemini    = GOOGLE_PROVIDER_ADAPTER_FACTORIES.gemini(env, { bodyTransform: deps.geminiBodyTransform || null });
-  const vertex    = GOOGLE_PROVIDER_ADAPTER_FACTORIES.vertex(env, { bodyTransform: deps.vertexBodyTransform || null });
-
-  return [openai, anthropic, copilot, gemini, vertex];
+  return PROVIDER_ADAPTER_FACTORIES.map(([createAdapter, bodyTransformKey]) =>
+    createAdapter(env, { bodyTransform: deps[bodyTransformKey] || null }));
 }
 
 module.exports = {
diff --git a/containers/api-proxy/providers/index.test.js b/containers/api-proxy/providers/index.test.js
new file mode 100644
index 000000000..3e7875377
--- /dev/null
+++ b/containers/api-proxy/providers/index.test.js
@@ -0,0 +1,43 @@
+'use strict';
+
+const { createAllAdapters } = require('./index');
+
+describe('createAllAdapters', () => {
+  it('creates providers in port order and wires each transform to its provider', () => {
+    const transforms = {
+      openaiBodyTransform: jest.fn(),
+      anthropicBodyTransform: jest.fn(),
+      copilotBodyTransform: jest.fn(),
+      geminiBodyTransform: jest.fn(),
+      vertexBodyTransform: jest.fn(),
+    };
+
+    const adapters = createAllAdapters({
+      OPENAI_API_KEY: 'openai-key',
+      ANTHROPIC_API_KEY: 'anthropic-key',
+      COPILOT_GITHUB_TOKEN: 'copilot-token',
+      GEMINI_API_KEY: 'gemini-key',
+      GOOGLE_API_KEY: 'vertex-key',
+    }, transforms);
+
+    expect(adapters.map(({ name, port }) => ({ name, port }))).toEqual([
+      { name: 'openai', port: 10000 },
+      { name: 'anthropic', port: 10001 },
+      { name: 'copilot', port: 10002 },
+      { name: 'gemini', port: 10003 },
+      { name: 'vertex', port: 10004 },
+    ]);
+    expect(adapters.map(adapter => adapter.getBodyTransform())).toEqual([
+      transforms.openaiBodyTransform,
+      transforms.anthropicBodyTransform,
+      expect.any(Function),
+      transforms.geminiBodyTransform,
+      transforms.vertexBodyTransform,
+    ]);
+
+    const copilotBody = Buffer.from('{}');
+    transforms.copilotBodyTransform.mockReturnValue(null);
+    adapters[2].getBodyTransform()(copilotBody);
+    expect(transforms.copilotBodyTransform).toHaveBeenCalledWith(copilotBody);
+  });
+});