diff --git a/README.md b/README.md
index 5121c57..b766d01 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 **Lint the manifest. Verify the refs. Catch the collisions before runtime.**
 
 [![ci](https://github.com/erphq/skillcheck/actions/workflows/ci.yml/badge.svg)](https://github.com/erphq/skillcheck/actions/workflows/ci.yml)
-![tests](https://img.shields.io/badge/tests-70%20passing-yellowgreen)
+![tests](https://img.shields.io/badge/tests-77%20passing-yellowgreen)
 
 [![license](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)
 [![status](https://img.shields.io/badge/status-pre--v0-orange.svg)](#roadmap)
@@ -97,6 +97,7 @@ Exit codes:
 | `description-length` | warn | Description longer than 500 chars dilutes the trigger signal |
 | `name-drift` | warn | Frontmatter `name:` doesn't match the filename or directory |
 | `description-collision` | warn | Two skills' descriptions have Jaccard ≥ 0.6 |
+| `tools-overloaded` | warn | `tools:` lists 10 or more entries; narrow the list to what this skill actually needs |
 | `parse` | error | The file doesn't have valid frontmatter / YAML |
 
 The MCP and built-in tool checks read `~/.claude/settings.json` and
diff --git a/test/sarif.test.ts b/test/sarif.test.ts
index d46917a..0fc7b82 100644
--- a/test/sarif.test.ts
+++ b/test/sarif.test.ts
@@ -20,9 +20,25 @@ describe("reportSarif", () => {
     expect(ruleIds).toContain("frontmatter-schema");
     expect(ruleIds).toContain("tool-unknown");
     expect(ruleIds).toContain("description-collision");
+    expect(ruleIds).toContain("tools-overloaded");
     expect(out.runs[0].results).toEqual([]);
   });
 
+  it("emits tools-overloaded at warning level with correct ruleIndex", () => {
+    const diagnostics: Diagnostic[] = [
+      {
+        severity: "warn",
+        rule: "tools-overloaded",
+        message: "tools: lists 11 tools; narrow the list to the tools this skill actually needs",
+        file: "/test/a.md",
+      },
+    ];
+    const out = JSON.parse(reportSarif(diagnostics, "/test", opts));
+    expect(out.runs[0].results[0].level).toBe("warning");
+    const idx = out.runs[0].results[0].ruleIndex;
+    expect(out.runs[0].tool.driver.rules[idx].id).toBe("tools-overloaded");
+  });
+
   it("converts severities to SARIF levels", () => {
     const diagnostics: Diagnostic[] = [
       { severity: "error", rule: "frontmatter-schema", message: "boom", file: "/test/a.md" },