diff --git a/docs/javascript-artifact-reconstruction.md b/docs/javascript-artifact-reconstruction.md
index 97d6cd41a..42d40e938 100644
--- a/docs/javascript-artifact-reconstruction.md
+++ b/docs/javascript-artifact-reconstruction.md
@@ -31,6 +31,11 @@ command and the generic route return their complete results inline. Native
 targets, single JavaScript files, `.app` bundles, and explicit deep-provider or
 snapshot requests retain the native deep-analysis route.
 
+Both CLI routes emit `rea_progress` JSON lines on stderr as inventory, source
+parsing, graph construction, validation, and Evidence hashing begin. Stdout
+remains the selected result document. Completion is reported after Evidence
+creation; a failed analysis retains its typed diagnostic result.
+
 Configure an MCP client with the ordinary REA setup command:
 
 ```bash
diff --git a/src/application/javascript/JavaScriptApplicationService.ts b/src/application/javascript/JavaScriptApplicationService.ts
index 6339379db..b1b180383 100644
--- a/src/application/javascript/JavaScriptApplicationService.ts
+++ b/src/application/javascript/JavaScriptApplicationService.ts
@@ -57,13 +57,27 @@ export const analyzeJavaScriptApplicationValidated = async (
         format: input.format,
       },
       options.signal,
+      options.progress,
     );
     const { electron_summary: summary, ...application } = reconstructed;
+    await options.progress?.report({
+      phase: "validate_javascript_application_result",
+      completed: 0,
+      total: 1,
+      message: "Validating the application analysis result",
+    });
     const result = javascriptApplicationAnalysisResultSchema.parse({
       ...application,
       summary,
       limitations: reconstructed.graph.limitations,
     });
+    await options.progress?.report({
+      phase: "create_javascript_application_evidence",
+      completed: 0,
+      total: 1,
+      message: "Creating and hashing application analysis Evidence",
+    });
+    const evidence = createJavaScriptApplicationEvidence(input, result);
     await options.progress?.report({
       phase: "analyze_javascript_application",
       completed: 1,
@@ -71,7 +85,7 @@ export const analyzeJavaScriptApplicationValidated = async (
       message: "Application graph and Electron boundaries reconstructed",
       terminal: true,
     });
-    return ok(createJavaScriptApplicationEvidence(input, result));
+    return ok(evidence);
   } catch (cause: unknown) {
     if (cause instanceof ArtifactReaderFailure)
       return err(
diff --git a/src/application/javascript/JavaScriptArtifactReconstruction.ts b/src/application/javascript/JavaScriptArtifactReconstruction.ts
index 7acf03b05..0be85beb5 100644
--- a/src/application/javascript/JavaScriptArtifactReconstruction.ts
+++ b/src/application/javascript/JavaScriptArtifactReconstruction.ts
@@ -15,6 +15,7 @@ import {
 import { scanCanonicalArtifactInventory } from "../ArtifactInventory.js";
 import { summarizeElectronBoundaries } from "./ElectronBoundaryAnalysis.js";
 import { buildJavaScriptSemanticGraph } from "./JavaScriptSemanticGraphBuilder.js";
+import type { ProgressReporter } from "../ProgressReporter.js";
 
 /** Application-layer result retaining local diagnostics outside the canonical graph. */
 export interface JavaScriptArtifactReconstructionResult {
@@ -45,7 +46,11 @@ export interface JavaScriptArtifactReconstructionResult {
 export const reconstructJavaScriptArtifact = async (
   rawInput: unknown,
   signal?: AbortSignal,
+  progress?: ProgressReporter,
 ): Promise<JavaScriptArtifactReconstructionResult> => {
+  const reportPhase = async (phase: string, message: string): Promise<void> => {
+    await progress?.report({ phase, completed: 0, total: 1, message });
+  };
   const input = javascriptArtifactReconstructionInputSchema.parse(rawInput);
   abortIfNeeded(signal);
   const path = await realpath(input.input_path);
@@ -58,10 +63,26 @@ export const reconstructJavaScriptArtifact = async (
     );
   const reader = createReader(path, format);
   try {
+    await reportPhase(
+      "read_javascript_artifacts",
+      "Reading inventoried JavaScript application sources",
+    );
     const files = await readJavaScriptArtifactFiles(reader, snapshot, signal);
+    await reportPhase(
+      "parse_javascript_sources",
+      `Parsing ${String(files.files.length)} application source files`,
+    );
     const analysis = analyzeJavaScriptArtifactFiles(files);
     abortIfNeeded(signal);
+    await reportPhase(
+      "build_javascript_application_graph",
+      "Constructing application and Electron boundary relationships",
+    );
     const graph = buildJavaScriptArtifactGraph(snapshot, files, analysis);
+    await reportPhase(
+      "build_javascript_semantic_graph",
+      "Constructing static semantic relationships",
+    );
     const semanticGraph = buildJavaScriptSemanticGraph({
       rootArtifactSha256: snapshot.manifest.root_sha256,
       applicationGraph: graph,
diff --git a/src/cli/javascriptApplicationAnalysis.ts b/src/cli/javascriptApplicationAnalysis.ts
index b1f08da9d..62a8bc5b0 100644
--- a/src/cli/javascriptApplicationAnalysis.ts
+++ b/src/cli/javascriptApplicationAnalysis.ts
@@ -1,4 +1,5 @@
 import { analyzeJavaScriptApplication } from "../application/javascript/JavaScriptApplicationService.js";
+import { createProgressReporter } from "../application/ProgressReporter.js";
 import { projectAnalysisError } from "../domain/analysisErrorProjection.js";
 import type { JsonValue } from "../domain/jsonValue.js";
 
@@ -6,7 +7,13 @@ import type { JsonValue } from "../domain/jsonValue.js";
 export const runCliJavaScriptApplicationAnalysis = async (
   input: unknown,
 ): Promise<JsonValue> => {
-  const result = await analyzeJavaScriptApplication(input);
+  const progress = createProgressReporter(
+    async (update) => {
+      process.stderr.write(`${JSON.stringify({ rea_progress: update })}\n`);
+    },
+    { minimumIntervalMs: 0 },
+  );
+  const result = await analyzeJavaScriptApplication(input, { progress });
   return result.ok ? result.value : cliError(result.error);
 };
 
diff --git a/tests/boundary/cli/cliOutput.test.ts b/tests/boundary/cli/cliOutput.test.ts
index c31ebf47a..783097b02 100644
--- a/tests/boundary/cli/cliOutput.test.ts
+++ b/tests/boundary/cli/cliOutput.test.ts
@@ -245,7 +245,7 @@ describe("compiled CLI output boundary", () => {
       expect(result).toMatchObject({
         exitCode: 0,
         stdout: "{}\n",
-        stderr: "",
+        stderr: expect.stringContaining('"rea_progress":'),
         json: {},
       });
       const nested = await cli.run({
@@ -260,7 +260,7 @@ describe("compiled CLI output boundary", () => {
       });
       expect(nested).toMatchObject({
         exitCode: 0,
-        stderr: "",
+        stderr: expect.stringContaining('"rea_progress":'),
         json: { normalized_result: {} },
       });
       const selected = await cli.run({
@@ -275,7 +275,7 @@ describe("compiled CLI output boundary", () => {
       });
       expect(selected).toMatchObject({
         exitCode: 0,
-        stderr: "",
+        stderr: expect.stringContaining('"rea_progress":'),
         json: {
           normalized_result: {
             summary: expect.objectContaining({ browser_windows: 0 }),
diff --git a/tests/boundary/cli/javascriptApplicationProgress.test.ts b/tests/boundary/cli/javascriptApplicationProgress.test.ts
new file mode 100644
index 000000000..a4a0863e4
--- /dev/null
+++ b/tests/boundary/cli/javascriptApplicationProgress.test.ts
@@ -0,0 +1,72 @@
+import { writeFile } from "node:fs/promises";
+import { join } from "node:path";
+
+import { expect } from "vitest";
+import { z } from "zod";
+
+import { parseEvidence } from "../../../src/domain/evidence.js";
+import { analyzeJavaScriptApplication } from "../../../src/application/javascript/JavaScriptApplicationService.js";
+import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";
+import { cliTest } from "../../support/cli/cliFixture.js";
+
+const progressLine = z.object({
+  rea_progress: z.object({
+    phase: z.string(),
+    completed: z.number(),
+    total: z.number().nullable(),
+    message: z.string(),
+    sequence: z.number(),
+    terminal: z.boolean().optional(),
+  }),
+});
+
+for (const command of ["analyze-javascript-application", "analyze"]) {
+  cliTest(
+    `${command} reports real analysis phases on stderr and preserves stdout Evidence`,
+    async ({ cli }) => {
+      const root = await createTestTempDirectory("rea-js-cli-progress-");
+      await writeFile(join(root, "main.js"), "fetch('');\n");
+      const direct = await analyzeJavaScriptApplication({ input_path: root });
+      if (!direct.ok) throw direct.error;
+
+      const output = await cli.run({ arguments: [command, root, "--json"] });
+      expect(output.exitCode).toBe(0);
+      expect(parseEvidence(output.json).evidence_id).toBe(
+        direct.value.evidence_id,
+      );
+      const updates = output.stderr
+        .trim()
+        .split("\n")
+        .map((line) => progressLine.parse(JSON.parse(line)).rea_progress);
+      expect(updates[0]?.completed).toBe(0);
+      expect(
+        updates.some(({ phase }) => phase === "parse_javascript_sources"),
+      ).toBe(true);
+      expect(updates.at(-1)).toMatchObject({ completed: 1, terminal: true });
+      expect(
+        updates.slice(0, -1).every(({ terminal }) => terminal !== true),
+      ).toBe(true);
+    },
+  );
+}
+
+cliTest(
+  "keeps a failed analysis distinct from a completed result",
+  async ({ cli }) => {
+    const root = await createTestTempDirectory("rea-js-cli-progress-failure-");
+    const output = await cli.run({
+      arguments: [
+        "analyze-javascript-application",
+        join(root, "absent"),
+        "--json",
+      ],
+    });
+    expect(output.json).toMatchObject({ code: "artifact_operation_failed" });
+    const updates = output.stderr
+      .trim()
+      .split("\n")
+      .map((line) => progressLine.parse(JSON.parse(line)).rea_progress);
+    expect(updates[0]?.completed).toBe(0);
+    expect(updates.every(({ terminal }) => terminal !== true)).toBe(true);
+  },
+);
diff --git a/tests/boundary/mcp/electronMcp.test.ts b/tests/boundary/mcp/electronMcp.test.ts
index 72d8892ed..4cc589e70 100644
--- a/tests/boundary/mcp/electronMcp.test.ts
+++ b/tests/boundary/mcp/electronMcp.test.ts
@@ -10,6 +10,7 @@ import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";
 
 import { createTestBinarySession } from "../../fixtures/binarySession.js";
 import type { ElectronActiveObservationPort } from "../../../src/application/javascript/ElectronActiveObservationPort.js";
+import { analyzeJavaScriptApplication } from "../../../src/application/javascript/JavaScriptApplicationService.js";
 import { CdpElectronProvider } from "../../../src/browser/CdpElectronProvider.js";
 import { createServer } from "../../../src/server/createServer.js";
 import { observed } from "../../fixtures/analysisExecution.js";
@@ -270,12 +271,18 @@ it("exposes the target-free static JavaScript application workflow", async () =>
   await server.connect(serverTransport);
   await client.connect(clientTransport);
 
-  const analyzed = await client.callTool({
-    name: "analyze_javascript_application",
-    arguments: { input_path: root },
-  });
+  const progress: number[] = [];
+  const analyzed = await client.callTool(
+    {
+      name: "analyze_javascript_application",
+      arguments: { input_path: root },
+    },
+    { onprogress: (update) => progress.push(update.progress) },
+  );
 
   expect(analyzed.isError).not.toBe(true);
+  expect(progress[0]).toBe(0);
+  expect(progress.at(-1)).toBe(1);
   const projected = z
     .object({
       evidence_id: z.string(),
@@ -314,6 +321,9 @@ it("exposes the target-free static JavaScript application workflow", async () =>
   expect(projected.result.graph.nodes.length).toBeGreaterThan(0);
   expect(projected.result.semantic_graph.nodes.length).toBeGreaterThan(0);
   expect(projected.evidence.operation).toBe("analyze_javascript_application");
+  const direct = await analyzeJavaScriptApplication({ input_path: root });
+  if (!direct.ok) throw direct.error;
+  expect(projected.evidence_id).toBe(direct.value.evidence_id);
 });
 
 const evidenceFor = (value: unknown) => {