diff --git a/packages/loopover-engine/package.json b/packages/loopover-engine/package.json
index 85364b186a..97ebc54b67 100644
--- a/packages/loopover-engine/package.json
+++ b/packages/loopover-engine/package.json
@@ -54,6 +54,10 @@
     "./signals/path-matchers": {
       "types": "./dist/signals/path-matchers.d.ts",
       "default": "./dist/signals/path-matchers.js"
+    },
+    "./signals/slop": {
+      "types": "./dist/signals/slop.d.ts",
+      "default": "./dist/signals/slop.js"
     }
   },
   "files": [
diff --git a/packages/loopover-mcp/bin/loopover-mcp.js b/packages/loopover-mcp/bin/loopover-mcp.js
index aca8c4d67a..bffdbd6fcb 100755
--- a/packages/loopover-mcp/bin/loopover-mcp.js
+++ b/packages/loopover-mcp/bin/loopover-mcp.js
@@ -6,6 +6,7 @@ import { delimiter, dirname, join } from "node:path";
 import { McpServer, ResourceTemplate } from "@modelcontextprotocol/sdk/server/mcp.js";
 import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
 import { buildFeasibilityVerdict, buildPrTextLint } from "@loopover/engine";
+import { buildSlopAssessment, SLOP_RUBRIC_MARKDOWN } from "@loopover/engine/signals/slop";
 import { z } from "zod";
 import { buildBranchAnalysisPayload, collectLocalDiff, collectLocalBranchMetadata, probeLocalScorer, referenceScorePreviewExample, resolveScorePreviewCommand, resolveWorkspaceCwd, sanitizeLocalScorerStatus, setupGuidanceForLocalScorer, isTestFile } from "../lib/local-branch.js";
 import { formatTable } from "../lib/format-table.js";
@@ -484,7 +485,7 @@ const STDIO_TOOL_DESCRIPTORS = [
   },
   {
     name: "loopover_check_slop_risk",
-    description: "Assess the deterministic slop risk of a planned change from local diff metadata (paths + line counts) + the PR description — an agent-native, source-free quality self-check. Returns slopRisk (0-100), band, findings, and the rubric. No repo data needed.",
+    description: "Assess the deterministic slop risk of a planned change from local diff metadata (paths + line counts) + the PR description — an agent-native, source-free quality self-check. Returns slopRisk (0-100), band, findings, and the rubric. Computed in-process; no repo data and no API round-trip.",
   },
   {
     name: "loopover_check_issue_slop",
@@ -830,7 +831,10 @@ registerStdioTool(
     description: stdioToolDescription("loopover_check_slop_risk"),
     inputSchema: checkSlopRiskShape,
   },
-  async (input) => toolResult("LoopOver slop-risk self-check.", await apiPost("/v1/lint/slop-risk", input)),
+  // Computed in-process from @loopover/engine (#6267) — matches the remote server's own buildSlopAssessment
+  // call (src/mcp/server.ts) and the /v1/lint/slop-risk route's `{ ...assessment, rubric }` shape with no API
+  // round-trip, so slop-risk self-checks work fully offline.
+  (input) => toolResult("LoopOver slop-risk self-check.", { ...buildSlopAssessment(input), rubric: SLOP_RUBRIC_MARKDOWN }),
 );
 
 registerStdioTool(
diff --git a/test/unit/mcp-local-check-slop-risk.test.ts b/test/unit/mcp-local-check-slop-risk.test.ts
new file mode 100644
index 0000000000..dc6b4823e8
--- /dev/null
+++ b/test/unit/mcp-local-check-slop-risk.test.ts
@@ -0,0 +1,98 @@
+import { Client } from "@modelcontextprotocol/sdk/client/index.js";
+import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";
+import { mkdtempSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+
+const bin = join(process.cwd(), "packages/loopover-mcp/bin/loopover-mcp.js");
+
+let client: Client;
+let transport: StdioClientTransport;
+let configDir: string;
+
+// An unreachable API endpoint with a tight timeout: if the stdio tool ever regressed to proxying over HTTP
+// (`apiPost("/v1/lint/slop-risk", …)`) instead of computing in-process, every call below would error out
+// against this dead address. Their success is what proves the local tool runs fully offline (#6267).
+async function connect() {
+  configDir = mkdtempSync(join(tmpdir(), "loopover-check-slop-risk-"));
+  transport = new StdioClientTransport({
+    command: "node",
+    args: [bin, "--stdio"],
+    env: {
+      ...(process.env as Record<string, string>),
+      LOOPOVER_CONFIG_DIR: configDir,
+      LOOPOVER_API_URL: "http://127.0.0.1:1",
+      LOOPOVER_API_TIMEOUT_MS: "400",
+    },
+  });
+  client = new Client({ name: "check-slop-risk-test", version: "0.0.1" });
+  await client.connect(transport);
+}
+
+async function disconnect() {
+  await client.close().catch(() => undefined);
+  if (configDir) rmSync(configDir, { recursive: true, force: true });
+}
+
+describe("loopover_check_slop_risk stdio tool (#6267)", () => {
+  beforeEach(connect);
+  afterEach(disconnect);
+
+  it("advertises the in-process, no-round-trip behavior in the tool list", async () => {
+    const { tools } = await client.listTools();
+    const tool = tools.find((t) => t.name === "loopover_check_slop_risk");
+    expect(tool).toBeDefined();
+    expect(tool?.description).toContain("no API round-trip");
+  });
+
+  it("regression: flags a low-effort change with band/findings/rubric computed in-process, no network call", async () => {
+    const result = await client.callTool({
+      name: "loopover_check_slop_risk",
+      arguments: {
+        changedFiles: [{ path: "src/foo.ts", additions: 50, deletions: 0 }],
+        description: "",
+      },
+    });
+    expect(result.isError).toBeFalsy();
+    const data = result.structuredContent as {
+      slopRisk: number;
+      band: string;
+      findings: { code: string }[];
+      rubric: string;
+    };
+    // A code file with no test evidence (15) + an empty description (15) = 30 → "low".
+    expect(data.slopRisk).toBe(30);
+    expect(data.band).toBe("low");
+    expect(data.findings.map((f) => f.code).sort()).toEqual(["empty_pr_description", "missing_test_evidence"]);
+    // The local path keeps the /v1/lint/slop-risk route's `{ ...assessment, rubric }` shape byte-for-byte.
+    expect(data.rubric).toContain("LoopOver slop assessment rubric");
+  });
+
+  it("returns a clean band with no findings offline for a substantive, well-described change", async () => {
+    const result = await client.callTool({
+      name: "loopover_check_slop_risk",
+      arguments: {
+        changedFiles: [
+          { path: "src/foo.ts", additions: 40, deletions: 2 },
+          { path: "test/unit/foo.test.ts", additions: 30, deletions: 0 },
+        ],
+        description: "Adds X to support Y because Z, with focused regression coverage.",
+      },
+    });
+    expect(result.isError).toBeFalsy();
+    const data = result.structuredContent as { slopRisk: number; band: string; findings: unknown[] };
+    expect(data.slopRisk).toBe(0);
+    expect(data.band).toBe("clean");
+    expect(data.findings).toEqual([]);
+  });
+
+  it("never leaks private financial terminology in the offline response", async () => {
+    const result = await client.callTool({
+      name: "loopover_check_slop_risk",
+      arguments: { changedFiles: [{ path: "src/foo.ts", additions: 50, deletions: 0 }], description: "" },
+    });
+    expect(result.isError).toBeFalsy();
+    expect(JSON.stringify(result)).not.toMatch(/hotkey|coldkey|wallet|mnemonic|payout|reward|trust score/i);
+  });
+});