diff --git a/src/domain/javascript/javascriptSemanticDataEffectHelpers.ts b/src/domain/javascript/javascriptSemanticDataEffectHelpers.ts
index 5485fcde9f..0f7a6d942e 100644
--- a/src/domain/javascript/javascriptSemanticDataEffectHelpers.ts
+++ b/src/domain/javascript/javascriptSemanticDataEffectHelpers.ts
@@ -275,12 +275,3 @@ export const dataEffectMemberCallee = (
   t.isMemberExpression(node.callee) || t.isOptionalMemberExpression(node.callee)
     ? node.callee
     : null;
-
-/** Read a parent member's object when present. */
-export const dataEffectMemberObject = (
-  node: t.Node | null,
-): t.Expression | t.Super | null =>
-  node !== null &&
-  (t.isMemberExpression(node) || t.isOptionalMemberExpression(node))
-    ? node.object
-    : null;
diff --git a/src/domain/javascript/javascriptSemanticDataEffects.ts b/src/domain/javascript/javascriptSemanticDataEffects.ts
index 445cd2e5ee..607843aabe 100644
--- a/src/domain/javascript/javascriptSemanticDataEffects.ts
+++ b/src/domain/javascript/javascriptSemanticDataEffects.ts
@@ -24,7 +24,6 @@ import {
   dataEffectArgumentBindingId as argumentBindingId,
   dataEffectLiteralString as literalString,
   dataEffectMemberCallee as memberCallee,
-  dataEffectMemberObject as memberObject,
   dataEffectPrimitive as primitiveValue,
   isSemanticProcessObject as isProcessObject,
   outerDataEffectBinding as outerAssignedBinding,
@@ -83,8 +82,8 @@ const collectConfigurations = (
   context: TraversalContext,
 ): ConfigurationCandidate[] => {
   const output: ConfigurationCandidate[] = [];
-  traverseWithContext(program, context, (node, parent) => {
-    const details = configurationDetails(node, parent, context);
+  traverseWithContext(program, context, (node) => {
+    const details = configurationDetails(node, context);
     if (details === null) return;
     const operation: JavaScriptSemanticConfigurationOperation = {
       configId: `config:${details.kind}:${String(node.start ?? -1)}:${String(node.end ?? -1)}`,
@@ -104,17 +103,13 @@ const collectConfigurations = (
 
 const configurationDetails = (
   node: t.Node,
-  parent: t.Node | null,
   context: TraversalContext,
 ): {
   readonly kind: "environment" | "argv" | "file";
   readonly key: string | null;
   readonly resolution: "complete" | "partial";
 } | null => {
-  if (
-    (t.isMemberExpression(node) || t.isOptionalMemberExpression(node)) &&
-    !(memberObject(parent) === node)
-  ) {
+  if (t.isMemberExpression(node) || t.isOptionalMemberExpression(node)) {
     const processMember = processConfigurationMember(node, context.state);
     if (processMember !== null) return processMember;
   }
diff --git a/tests/acceptance/applications/javascriptConfigurationReadsCli.test.ts b/tests/acceptance/applications/javascriptConfigurationReadsCli.test.ts
new file mode 100644
index 0000000000..8b9ba1abc9
--- /dev/null
+++ b/tests/acceptance/applications/javascriptConfigurationReadsCli.test.ts
@@ -0,0 +1,78 @@
+import { join } from "node:path";
+
+import { expect } from "vitest";
+
+import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";
+import { cliTest } from "../../support/cli/cliFixture.js";
+import { analyzeJavaScriptDirectory } from "../../support/cli/javascriptApplication.js";
+import { writeFixtureFiles } from "../../support/javascriptApplicationFixture.js";
+
+cliTest.for(["CLI", "stdio MCP"] as const)(
+  "retains configuration sources consumed by member access through %s",
+  async (surface, { cli, processes }) => {
+    const root = await createTestTempDirectory("rea-config-reads-");
+    await writeFixtureFiles(root, {
+      "entry.mjs": [
+        "const length = process.env.REA_ENDPOINT.length;",
+        "const endpoint = process.env.REA_ENDPOINT;",
+        "const argumentLength = process.argv[2].length;",
+        "const mode = process.argv[3].trim();",
+        "const optional = process.env.REA_MISSING?.length;",
+        "function shadow(process) { return process.env.LOCAL.length + process.argv[2].length; }",
+        'const local = { env: { FAKE: "fake" }, argv: [0, 1, "abc"] };',
+        'const control = shadow({ env: { LOCAL: "local" }, argv: [0, 1, "abc"] });',
+        "console.log(JSON.stringify([length, endpoint, argumentLength, mode, optional, control, local.env.FAKE.length]));",
+      ].join("\n"),
+    });
+    const control = await processes.run(
+      process.execPath,
+      [join(root, "entry.mjs"), "abc", " mode "],
+      { env: { REA_ENDPOINT: "endpoint" }, timeoutMs: 15_000 },
+    );
+    expect(control.exitCode, control.stderr).toBe(0);
+    expect(JSON.parse(control.stdout)).toEqual([
+      8,
+      "endpoint",
+      3,
+      "mode",
+      null,
+      8,
+      4,
+    ]);
+    const graph = (await analyzeJavaScriptDirectory(surface, cli, root))
+      .semantic_graph;
+    const sources = graph.nodes.filter((node) => node.kind === "config-source");
+    expect(
+      sources
+        .map((node) => [node.properties.source_kind, node.properties.key])
+        .sort(),
+    ).toEqual([
+      ["argv", "2"],
+      ["argv", "3"],
+      ["environment", "REA_ENDPOINT"],
+      ["environment", "REA_ENDPOINT"],
+      ["environment", "REA_MISSING"],
+    ]);
+    expect(sources.every((node) => node.properties.value === null)).toBe(true);
+    const endpoint = graph.nodes.find(
+      (node) => node.kind === "binding" && node.label === "endpoint",
+    );
+    expect(endpoint).toBeDefined();
+    for (const source of sources) {
+      const bindingTargets = graph.relations
+        .filter((relation) => relation.source_node_id === source.node_id)
+        .flatMap((relation) =>
+          graph.nodes.filter(
+            (node) =>
+              node.node_id === relation.target_node_id &&
+              node.kind === "binding",
+          ),
+        );
+      expect(bindingTargets.map((node) => node.node_id)).toEqual(
+        source.identity.source_range?.start.line === 2
+          ? [endpoint?.node_id]
+          : [],
+      );
+    }
+  },
+);