diff --git a/packages/gittensory-miner/README.md b/packages/gittensory-miner/README.md
index a0ca58d01..816aa0192 100644
--- a/packages/gittensory-miner/README.md
+++ b/packages/gittensory-miner/README.md
@@ -131,10 +131,12 @@ The package ships a second bin entry, `gittensory-miner-mcp`, a minimal [Model C
 gittensory-miner-mcp
 ```
 
-It currently exposes a single tool, `gittensory_miner_ping` — a health check that returns a static
-`{ "status": "ok", "tool": "gittensory_miner_ping" }` object, reads no AMS state, and takes no arguments. This is a
-scaffold (#5153): real AMS-state-reading tools (status/doctor diagnostics, portfolio dashboard, claim-ledger
-listing) land as follow-up PRs on top of it.
+It exposes these read-only tools:
+
+- `gittensory_miner_ping` (#5153) — a health check returning a static `{ "status": "ok", "tool": "gittensory_miner_ping" }` object. Reads no AMS state, takes no arguments.
+- `gittensory_miner_get_portfolio_dashboard` (#5155) — the per-repo portfolio-queue backlog dashboard: status counts (queued / in_progress / done), totals, and the oldest-queued age. Wraps `collectPortfolioDashboard()` (no new logic) — the same data `gittensory-miner queue dashboard --json` prints locally. Read-only, takes no arguments.
+
+Further AMS-state-reading tools (status/doctor diagnostics, claim-ledger listing, run-state, event/governor ledgers) land as follow-up PRs on top of this server.
 
 ## Version check
 
diff --git a/packages/gittensory-miner/bin/gittensory-miner-mcp.d.ts b/packages/gittensory-miner/bin/gittensory-miner-mcp.d.ts
index 0a2c5d90b..576a6affb 100644
--- a/packages/gittensory-miner/bin/gittensory-miner-mcp.d.ts
+++ b/packages/gittensory-miner/bin/gittensory-miner-mcp.d.ts
@@ -3,8 +3,18 @@ import type { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
 /** The static, non-secret payload the gittensory_miner_ping tool always returns, independent of input. */
 export const MINER_PING_STATUS: { status: "ok"; tool: "gittensory_miner_ping" };
 
+export interface MinerMcpServerOptions {
+  /**
+   * Override the portfolio-queue store opener (defaults to the real on-disk store); injection seam for tests.
+   * Typed to the minimal read surface the dashboard tool uses, mirroring runPortfolioDashboard's own seam.
+   */
+  initPortfolioQueue?: () => { listQueue(repoFullName?: string | null): unknown[]; close(): void };
+  /** Override the clock used for the oldest-queued age (defaults to Date.now()); injection seam for tests. */
+  nowMs?: number;
+}
+
 /**
- * Build the miner MCP server with its single gittensory_miner_ping health-check tool registered. No I/O
- * and no AMS-state reads, so a test can drive it over an in-memory transport.
+ * Build the miner MCP server with its tools registered (gittensory_miner_ping, gittensory_miner_get_portfolio_dashboard).
+ * `options` supplies test injection seams; production callers pass nothing.
  */
-export function createMinerMcpServer(): McpServer;
+export function createMinerMcpServer(options?: MinerMcpServerOptions): McpServer;
diff --git a/packages/gittensory-miner/bin/gittensory-miner-mcp.js b/packages/gittensory-miner/bin/gittensory-miner-mcp.js
index e5ca311b5..944d3232f 100755
--- a/packages/gittensory-miner/bin/gittensory-miner-mcp.js
+++ b/packages/gittensory-miner/bin/gittensory-miner-mcp.js
@@ -3,12 +3,15 @@ import { readFileSync, realpathSync } from "node:fs";
 import { fileURLToPath } from "node:url";
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
 import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { collectPortfolioDashboard } from "../lib/portfolio-dashboard.js";
+import { initPortfolioQueueStore } from "../lib/portfolio-queue.js";
 
-// Minimal MCP stdio-server scaffold for @jsonbored/gittensory-miner (#5153). Mirrors the
-// packages/gittensory-mcp harness (MCP SDK server + stdio transport) but ships exactly ONE trivial
-// health-check tool -- gittensory_miner_ping -- returning a static status object. It reads NO AMS
-// state and takes no arguments. Future AMS-state-reading tools (status/doctor, portfolio dashboard,
-// claim-ledger listing) land as follow-up PRs on top of this scaffold.
+// MCP stdio server for @jsonbored/gittensory-miner (scaffold #5153). Mirrors the packages/gittensory-mcp
+// harness (MCP SDK server + stdio transport). Tools:
+//   - gittensory_miner_ping (#5153): trivial static health check, reads no AMS state.
+//   - gittensory_miner_get_portfolio_dashboard (#5155): read-only per-repo backlog dashboard, wrapping the
+//     existing collectPortfolioDashboard aggregator (no new logic; same data as `queue dashboard --json`).
+// Remaining AMS-state-reading tools (status/doctor, claim-ledger listing, run-state, etc.) land as follow-ups.
 
 // Read the version from this package's own package.json (always shipped) rather than a hand-synced
 // literal, so a release bump never has a second place to forget -- same approach as the mcp harness.
@@ -18,11 +21,11 @@ const ownPackageJson = JSON.parse(readFileSync(new URL("../package.json", import
 export const MINER_PING_STATUS = { status: "ok", tool: "gittensory_miner_ping" };
 
 /**
- * Build the miner MCP server with its single health-check tool registered. No I/O and no AMS-state
- * reads, so a test can drive it over an in-memory transport without spawning a process or requiring
- * any on-disk state to exist.
+ * Build the miner MCP server with its tools registered. `options.initPortfolioQueue` / `options.nowMs` are
+ * injection seams for tests (default to the real portfolio-queue store and the wall clock); the ping tool needs
+ * neither. The portfolio-dashboard tool opens the queue only when invoked and closes any store it opened.
  */
-export function createMinerMcpServer() {
+export function createMinerMcpServer(options = {}) {
   const server = new McpServer({ name: "gittensory-miner", version: ownPackageJson.version });
   server.registerTool(
     "gittensory_miner_ping",
@@ -34,6 +37,26 @@ export function createMinerMcpServer() {
     },
     async () => ({ content: [{ type: "text", text: JSON.stringify(MINER_PING_STATUS) }] }),
   );
+  server.registerTool(
+    "gittensory_miner_get_portfolio_dashboard",
+    {
+      description:
+        "Read-only per-repo portfolio-queue backlog dashboard: status counts (queued/in_progress/done), totals, " +
+        "and the oldest-queued age in ms. Wraps the existing collectPortfolioDashboard aggregator (no new logic) " +
+        "-- the same data `gittensory-miner queue dashboard --json` prints locally. Takes no arguments; mutates nothing.",
+      inputSchema: {},
+    },
+    async () => {
+      const ownsQueue = options.initPortfolioQueue === undefined;
+      const portfolioQueue = (options.initPortfolioQueue ?? initPortfolioQueueStore)();
+      try {
+        const summary = collectPortfolioDashboard({ portfolioQueue }, { nowMs: options.nowMs ?? Date.now() });
+        return { content: [{ type: "text", text: JSON.stringify(summary) }] };
+      } finally {
+        if (ownsQueue) portfolioQueue.close();
+      }
+    },
+  );
   return server;
 }
 
diff --git a/test/unit/miner-mcp-scaffold.test.ts b/test/unit/miner-mcp-scaffold.test.ts
index 11d208fa2..7b360f1e3 100644
--- a/test/unit/miner-mcp-scaffold.test.ts
+++ b/test/unit/miner-mcp-scaffold.test.ts
@@ -4,19 +4,24 @@ import { describe, expect, it } from "vitest";
 import {
   createMinerMcpServer,
   MINER_PING_STATUS,
+  type MinerMcpServerOptions,
 } from "../../packages/gittensory-miner/bin/gittensory-miner-mcp.js";
+import { collectPortfolioDashboard } from "../../packages/gittensory-miner/lib/portfolio-dashboard.js";
 
-// Smoke test for the gittensory-miner MCP scaffold (#5153). Drives the real server over an in-memory
-// transport (no child process, no AMS state on disk) and exercises the single gittensory_miner_ping tool.
+// Tests for the gittensory-miner MCP server: the #5153 ping scaffold and the #5155 read-only
+// portfolio-dashboard tool. Drives the real server over an in-memory transport (no child process); the
+// dashboard tool's store opener and clock are injected so no on-disk AMS state is required.
 
-async function connectedClient(): Promise<Client> {
+type Content = { content: Array<{ type: string; text?: string }> };
+
+async function connectedClient(options: MinerMcpServerOptions = {}): Promise<Client> {
   const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();
   const client = new Client({ name: "miner-mcp-test", version: "0.0.0" });
-  await Promise.all([createMinerMcpServer().connect(serverTransport), client.connect(clientTransport)]);
+  await Promise.all([createMinerMcpServer(options).connect(serverTransport), client.connect(clientTransport)]);
   return client;
 }
 
-function pingText(result: { content: Array<{ type: string; text?: string }> }): string {
+function toolText(result: Content): string {
   const first = result.content[0];
   if (!first || first.type !== "text" || typeof first.text !== "string") {
     throw new Error("expected a single text content block");
@@ -24,31 +29,88 @@ function pingText(result: { content: Array<{ type: string; text?: string }> }):
   return first.text;
 }
 
-describe("gittensory-miner MCP scaffold (#5153)", () => {
-  it("exposes exactly the gittensory_miner_ping tool", async () => {
+const NOW_MS = Date.parse("2026-02-01T00:00:00Z");
+const QUEUE_ROWS = [
+  { repoFullName: "acme/api", identifier: "pr:1", priority: 0, status: "queued", enqueuedAt: "2026-01-01T00:00:00Z" },
+  { repoFullName: "acme/api", identifier: "pr:2", priority: 0, status: "in_progress", enqueuedAt: "2026-01-02T00:00:00Z" },
+  { repoFullName: "acme/web", identifier: "pr:3", priority: 0, status: "done", enqueuedAt: "2026-01-03T00:00:00Z" },
+  { repoFullName: "acme/web", identifier: "pr:4", priority: 0, status: "queued", enqueuedAt: "2026-01-04T00:00:00Z" },
+];
+
+function fakeQueue(rows: unknown[]): { listQueue(): unknown[]; close(): void } {
+  return { listQueue: () => rows, close: () => {} };
+}
+
+describe("gittensory-miner MCP server (#5153 scaffold)", () => {
+  it("exposes the ping and portfolio-dashboard tools", async () => {
     const client = await connectedClient();
     const { tools } = await client.listTools();
-    expect(tools.map((tool) => tool.name)).toEqual(["gittensory_miner_ping"]);
+    expect(tools.map((tool) => tool.name).sort()).toEqual([
+      "gittensory_miner_get_portfolio_dashboard",
+      "gittensory_miner_ping",
+    ]);
   });
 
   it("gittensory_miner_ping returns the static, non-secret status object", async () => {
     const client = await connectedClient();
-    const result = (await client.callTool({ name: "gittensory_miner_ping", arguments: {} })) as {
-      content: Array<{ type: string; text?: string }>;
-    };
-    expect(JSON.parse(pingText(result))).toEqual({ status: "ok", tool: "gittensory_miner_ping" });
-    expect(JSON.parse(pingText(result))).toEqual(MINER_PING_STATUS);
+    const result = (await client.callTool({ name: "gittensory_miner_ping", arguments: {} })) as Content;
+    expect(JSON.parse(toolText(result))).toEqual({ status: "ok", tool: "gittensory_miner_ping" });
+    expect(JSON.parse(toolText(result))).toEqual(MINER_PING_STATUS);
   });
 
-  it("returns the same object on every call, with no AMS state required on disk (invariant)", async () => {
+  it("gittensory_miner_ping returns the same object on every call, no AMS state required (invariant)", async () => {
     const client = await connectedClient();
-    const first = (await client.callTool({ name: "gittensory_miner_ping", arguments: {} })) as {
-      content: Array<{ type: string; text?: string }>;
-    };
-    const second = (await client.callTool({ name: "gittensory_miner_ping", arguments: {} })) as {
-      content: Array<{ type: string; text?: string }>;
-    };
-    expect(pingText(first)).toBe(pingText(second));
-    expect(JSON.parse(pingText(first))).toEqual(MINER_PING_STATUS);
+    const a = (await client.callTool({ name: "gittensory_miner_ping", arguments: {} })) as Content;
+    const b = (await client.callTool({ name: "gittensory_miner_ping", arguments: {} })) as Content;
+    expect(toolText(a)).toBe(toolText(b));
+    expect(JSON.parse(toolText(a))).toEqual(MINER_PING_STATUS);
+  });
+});
+
+describe("gittensory_miner_get_portfolio_dashboard (#5155)", () => {
+  function dashboardClient(rows: unknown[]): Promise<Client> {
+    return connectedClient({ initPortfolioQueue: () => fakeQueue(rows), nowMs: NOW_MS });
+  }
+
+  it("returns per-repo status counts, totals, and oldest-queued age over a multi-repo backlog", async () => {
+    const client = await dashboardClient(QUEUE_ROWS);
+    const result = (await client.callTool({
+      name: "gittensory_miner_get_portfolio_dashboard",
+      arguments: {},
+    })) as Content;
+    const summary = JSON.parse(toolText(result));
+    expect(summary.total).toBe(4);
+    expect(summary.byStatus).toEqual({ queued: 2, in_progress: 1, done: 1 });
+    expect(summary.repos.map((repo: { repoFullName: string }) => repo.repoFullName)).toEqual(["acme/api", "acme/web"]);
+    expect(summary.repos[0]).toEqual({
+      repoFullName: "acme/api",
+      byStatus: { queued: 1, in_progress: 1, done: 0 },
+      total: 2,
+    });
+    expect(summary.oldestQueuedAgeMs).toBe(NOW_MS - Date.parse("2026-01-01T00:00:00Z"));
+  });
+
+  it("handles an empty queue without a clock error (single-repo/empty edge)", async () => {
+    const client = await dashboardClient([]);
+    const result = (await client.callTool({
+      name: "gittensory_miner_get_portfolio_dashboard",
+      arguments: {},
+    })) as Content;
+    expect(JSON.parse(toolText(result))).toEqual({
+      total: 0,
+      byStatus: { queued: 0, in_progress: 0, done: 0 },
+      repos: [],
+      oldestQueuedAgeMs: null,
+    });
+  });
+
+  it("is structurally identical to collectPortfolioDashboard() — the wrapper adds no drift (invariant)", async () => {
+    const client = await dashboardClient(QUEUE_ROWS);
+    const result = (await client.callTool({
+      name: "gittensory_miner_get_portfolio_dashboard",
+      arguments: {},
+    })) as Content;
+    const direct = collectPortfolioDashboard({ portfolioQueue: fakeQueue(QUEUE_ROWS) }, { nowMs: NOW_MS });
+    expect(JSON.parse(toolText(result))).toEqual(direct);
   });
 });