diff --git a/src/tools/fs/glob.ts b/src/tools/fs/glob.ts
index 7a730cfca..a0d9ad67b 100644
--- a/src/tools/fs/glob.ts
+++ b/src/tools/fs/glob.ts
@@ -51,7 +51,8 @@ export async function globFiles(
       }
       if (!e.isFile() && !e.isSymbolicLink()) continue;
       const rel = displayRel(ctx.rootDir, full);
-      if (!isMatch(rel)) continue;
+      const matchRel = displayRel(startAbs, full);
+      if (!isMatch(matchRel)) continue;
       let mtimeMs = 0;
       if (sortBy === "mtime") {
         try {
diff --git a/tests/filesystem-tools.test.ts b/tests/filesystem-tools.test.ts
index 29c941826..f6acf2120 100644
--- a/tests/filesystem-tools.test.ts
+++ b/tests/filesystem-tools.test.ts
@@ -1309,6 +1309,33 @@ describe("filesystem tools (built-in, sandbox-enforced)", () => {
       expect(lines.length).toBe(3);
       expect(lines[lines.length - 1]).toMatch(/3 more matches/);
     });
+
+    it("matches relative to a custom path base directory", async () => {
+      const out = await tools.dispatch("glob", JSON.stringify({ path: "src", pattern: "*.ts" }));
+      expect(out).toContain("src/index.ts");
+      expect(out).not.toContain("(no matches)");
+    });
+
+    it("matches relative to an absolute path argument", async () => {
+      const absDir = join(root, "absdir");
+      await fs.mkdir(absDir, { recursive: true });
+      await fs.writeFile(join(absDir, "testfile.ts"), "export const a = 1;");
+      const out = await tools.dispatch("glob", JSON.stringify({ path: absDir, pattern: "*.ts" }));
+      expect(out).toContain("absdir/testfile.ts");
+      expect(out).not.toContain("(no matches)");
+    });
+
+    it("matches relative to dot path '.' and does not recurse unless requested", async () => {
+      await fs.writeFile(join(root, "top.ts"), "x");
+      await fs.mkdir(join(root, "sub"), { recursive: true });
+      await fs.writeFile(join(root, "sub", "a.ts"), "y");
+
+      const out = await tools.dispatch("glob", JSON.stringify({ path: ".", pattern: "*.ts" }));
+      const lines = out.split("\n").filter((l) => l.trim());
+      expect(lines).toContain("top.ts");
+      expect(lines).not.toContain("sub/a.ts");
+      expect(lines).not.toContain("src/index.ts");
+    });
   });
 
   describe("search_content — context lines (-A/-B/-C semantics)", () => {