diff --git a/docs/dev/TRACING.md b/docs/dev/TRACING.md
index eaf1ff6dff..82c3d1d11a 100644
--- a/docs/dev/TRACING.md
+++ b/docs/dev/TRACING.md
@@ -79,4 +79,4 @@ See [Build](BUILD.md#performance-trace) for the trace format, summary fields and
 
 ## Running titles repeatably
 
-`python tools/title_run.py --games <directory> [ID ...]` relinks and runs extracted title packages found under `--games` (a directory holding `eboot.bin` and `sce_sys/param.json`) and writes `summary.json` and a fixed-format `summary.md` under `--out` (default `build/title-runs/<commit>-<time>/`). Each title runs `--runs` times (default 2): the first with empty AnyPS5 and Mesa or NVIDIA shader caches, the next ones keeping them. AMD's Windows `VkCache` is not isolated. On Windows the title's windows open behind every other window, without focus and without being minimized, and can be brought forward from the taskbar; elsewhere run it under a virtual display if that matters. A run ends as `relink-failed`, `crashed`, `exited`, `stalled` (no present in the last 20 s, or too few presents for a frame to be dumped), `blank` (the last frame is one colour) or `rendering`; the first, middle and last dumped frames are kept. A screen that presents only when its view changes, such as OpenNOW's sign-in page, stops after a few presents and is reported `stalled` although the title still answers input; pressing a button through `tools/pad_input.py` with `APS5_PAD_INPUT_FILE` set tells it apart from a stuck title. `--compare <summary.json>` lists regressions, improvements and missing titles against an earlier run, limited to the IDs given when there are any. Titles are prepared in `<out>/work/<ID>/`, the same path on every run, so a firewall prompt for a title that opens a port appears once; answering Cancel does not affect the run. Per-title relink flags, run length and environment live in `tools/titles.json`.
+`python tools/title_run.py --games <directory> [ID ...]` relinks and runs extracted title packages found under `--games` (a directory holding `eboot.bin` and `sce_sys/param.json`) and writes `summary.json` and a fixed-format `summary.md` under `--out` (default `build/title-runs/<commit>-<time>/`). Each title runs `--runs` times (default 2): the first with empty AnyPS5 and Mesa or NVIDIA shader caches, the next ones keeping them. AMD's Windows `VkCache` is not isolated. On Windows the title's windows open behind every other window, without focus and without being minimized, and can be brought forward from the taskbar; elsewhere run it under a virtual display if that matters. A run ends as `relink-failed`, `crashed`, `exited`, `stalled` (no present in the last 20 s, or too few presents for a frame to be dumped), `blank` (the last frame is one colour) or `rendering`; the first, middle and last dumped frames are kept. A screen that presents only when its view changes stops after a few presents and is reported `stalled` although the title still answers input; pressing a button through `tools/pad_input.py` with `APS5_PAD_INPUT_FILE` set tells it apart from a stuck title. `--compare <summary.json>` lists regressions, improvements and missing titles against an earlier run, limited to the IDs given when there are any. Titles are prepared in `<out>/work/<ID>/`, the same path on every run, so a firewall prompt for a title that opens a port appears once; answering Cancel does not affect the run. Per-title relink flags, run length and environment live in `tools/titles.json`.
diff --git a/tools/tests/test_title_run.py b/tools/tests/test_title_run.py
index 73d77c35ea..8fcd4d5f54 100644
--- a/tools/tests/test_title_run.py
+++ b/tools/tests/test_title_run.py
@@ -42,8 +42,12 @@ class TitlesTests(unittest.TestCase):
             title_run.load_titles(self.write({"PPSA00001": {"relink": [1]}}))
 
     def test_bad_id_is_refused(self):
-        with self.assertRaisesRegex(ValueError, "VLC is not a title ID"):
-            title_run.load_titles(self.write({"VLC": {}}))
+        with self.assertRaisesRegex(ValueError, "NOT-AN-ID is not a title ID"):
+            title_run.load_titles(self.write({"NOT-AN-ID": {}}))
+
+    def test_name_is_refused(self):
+        with self.assertRaisesRegex(ValueError, "PPSA00001: unknown field name"):
+            title_run.load_titles(self.write({"PPSA00001": {"name": "Light"}}))
 
     def test_default_entry(self):
         self.assertEqual(title_run.relink_args({}, "windows"), ["--windows"])
@@ -147,26 +151,26 @@ class ReportTests(unittest.TestCase):
         self.assertEqual(title_run.cell([run("rendering")], "warm"), "-")
 
     def test_worst_and_compare(self):
-        now = summary({"PPSA85300": {"name": "VLC", "version": "0.4", "runs": [run("crashed"), run("crashed", "warm")]},
+        now = summary({"PPSA85300": {"name": "Light", "version": "0.4", "runs": [run("crashed"), run("crashed", "warm")]},
                        "PPSA97358": {"name": "XPSemu", "version": "A2.1", "runs": [run("rendering"), run("rendering", "warm")]}})
-        before = summary({"PPSA85300": {"name": "VLC", "version": "0.4", "runs": [run("rendering"), run("rendering", "warm")]},
+        before = summary({"PPSA85300": {"name": "Light", "version": "0.4", "runs": [run("rendering"), run("rendering", "warm")]},
                           "PPSA97358": {"name": "XPSemu", "version": "A2.1", "runs": [run("stalled"), run("stalled", "warm")]}})
         self.assertEqual(title_run.worst(now["titles"]["PPSA85300"]["runs"]), "crashed")
         self.assertEqual(title_run.compare(now, before),
                          ([("PPSA85300", "rendering", "crashed")], [("PPSA97358", "stalled", "rendering")]))
 
     def test_render_markdown(self):
-        now = summary({"PPSA85300": {"name": "VLC", "version": "0.4",
+        now = summary({"PPSA85300": {"name": "Light", "version": "0.4",
                                      "runs": [run("crashed", error="what(): unsupported MIB 1.1 | x"), run("rendering", "warm", 31.0)]}})
-        before = summary({"PPSA85300": {"name": "VLC", "version": "0.4", "runs": [run("rendering"), run("rendering", "warm")]}})
+        before = summary({"PPSA85300": {"name": "Light", "version": "0.4", "runs": [run("rendering"), run("rendering", "warm")]}})
         self.assertEqual(title_run.render_markdown(now, before), "\n".join([
             "AnyPS5 `abc1234`, main + #6814. Windows 11, Radeon 860M, driver 32.0.13058.8001, CPU Ryzen AI 7 350. 2 runs per title, 60 s each.",
             "",
-            "Regressions: VLC (PPSA85300) rendering -> crashed",
+            "Regressions: Light (PPSA85300) rendering -> crashed",
             "",
             "| Title | ID | Version | Cold | Warm | FPS | First error | Before |",
             "|---|---|---|---|---|---|---|---|",
-            "| VLC | PPSA85300 | 0.4 | crashed | rendering | 31.0 | what(): unsupported MIB 1.1 \\| x | rendering |",
+            "| Light | PPSA85300 | 0.4 | crashed | rendering | 31.0 | what(): unsupported MIB 1.1 \\| x | rendering |",
             "",
         ]))
         self.assertNotIn("Before", title_run.render_markdown(now))
@@ -174,8 +178,8 @@ class ReportTests(unittest.TestCase):
         self.assertTrue(title_run.render_markdown(now).startswith("AnyPS5 `abc1234`, main + #6814. CPU Ryzen AI 7 350. 2 runs"))
 
     def test_render_markdown_lists_missing_titles(self):
-        now = summary({"PPSA85300": {"name": "VLC", "version": "0.4", "runs": [run("rendering"), run("rendering", "warm")]}})
-        before = summary({"PPSA85300": {"name": "VLC", "version": "0.4", "runs": [run("rendering"), run("rendering", "warm")]},
+        now = summary({"PPSA85300": {"name": "Light", "version": "0.4", "runs": [run("rendering"), run("rendering", "warm")]}})
+        before = summary({"PPSA85300": {"name": "Light", "version": "0.4", "runs": [run("rendering"), run("rendering", "warm")]},
                           "PPSA97358": {"name": "XPSemu", "version": "A2.1", "runs": [run("stalled"), run("stalled", "warm")]}})
         self.assertIn("Missing: XPSemu (PPSA97358)", title_run.render_markdown(now, before))
 
@@ -223,6 +227,12 @@ class PreparationTests(unittest.TestCase):
         with self.assertRaisesRegex(ValueError, "param.json: no titleId"):
             title_run.discover([self.root])
 
+    def test_discover_refuses_a_title_id_that_is_not_one(self):
+        for index, title_id in enumerate(("../../outside", str(self.root / "elsewhere"), "PPSA0001")):
+            package(self.root / str(index) / "PPSA00001", title_id)
+            with self.assertRaisesRegex(ValueError, "is not a title ID"):
+                title_run.discover([self.root / str(index)])
+
     def test_unwrap_or_copy_keeps_an_elf(self):
         source = self.root / "eboot.bin"
         source.write_bytes(b"\x7fELF" + bytes(60))
diff --git a/tools/title_run.py b/tools/title_run.py
index 8ed221155b..45feeac00b 100644
--- a/tools/title_run.py
+++ b/tools/title_run.py
@@ -18,14 +18,15 @@ sys.path.insert(0, str(ROOT / "tools"))
 import unwrap_self
 from package_release import windows_runtime
 OUTCOMES = ("relink-failed", "crashed", "exited", "stalled", "blank", "rendering")
-TITLE_FIELDS = {"name": str, "relink": list, "fixed_base": str, "executables": list, "seconds": int, "env": dict}
+TITLE_ID = re.compile(r"[A-Z]{4}[0-9]{5}")
+TITLE_FIELDS = {"relink": list, "fixed_base": str, "executables": list, "seconds": int, "env": dict}
 FIXED_BASE_FLAGS = {"windows": "--windows-fixed-base", "linux": "--linux-fixed-base"}
 
 
 def load_titles(path):
     titles = json.loads(Path(path).read_text(encoding="utf-8"))
     for title_id, entry in titles.items():
-        if not re.fullmatch(r"[A-Z]{4}[0-9]{5}", title_id):
+        if not TITLE_ID.fullmatch(title_id):
             raise ValueError(f"{path}: {title_id} is not a title ID")
         for key, value in entry.items():
             if key not in TITLE_FIELDS:
@@ -180,6 +181,8 @@ def discover(directories):
             title_id = data.get("titleId")
             if not isinstance(title_id, str):
                 raise ValueError(f"{param}: no titleId")
+            if not TITLE_ID.fullmatch(title_id):
+                raise ValueError(f"{param}: titleId {title_id!r} is not a title ID")
             if title_id in found:
                 raise ValueError(f"{title_id} found more than once: {found[title_id]['package']} and {package}")
             localized = data.get("localizedParameters", {})
@@ -535,7 +538,7 @@ def main(argv=None):
                     summary["machine"][key] = summary["machine"][key] or value
             runs.append({"run": number, "cache": "cold" if number == 1 else "warm", **result})
             print(f"{title_id} run{number}: {result['outcome']}", flush=True)
-        summary["titles"][title_id] = {"name": entry.get("name", found[title_id]["name"]), "version": found[title_id]["version"], "seconds": seconds, "runs": runs}
+        summary["titles"][title_id] = {"name": found[title_id]["name"], "version": found[title_id]["version"], "seconds": seconds, "runs": runs}
         write_summary(output, summary)
     write_summary(output, summary)
     report = render_markdown(summary, previous)
diff --git a/tools/titles.json b/tools/titles.json
index ba70ffa233..283fee3ace 100644
--- a/tools/titles.json
+++ b/tools/titles.json
@@ -1,14 +1,14 @@
 {
-  "PPSA01153": {"name": "OliSe Player", "relink": ["--trap-sdk-syscall-stubs"]},
-  "PPSA68091": {"name": "Ruffle Flash", "relink": ["--registry"], "fixed_base": "0x400000"},
-  "PPSA69421": {"name": "SuperTuxKart", "relink": ["--trap-sdk-syscall-stubs"]},
-  "PPSA85300": {"name": "VLC", "relink": ["--registry"], "fixed_base": "0x400000"},
-  "PPSA97358": {"name": "XPSemu", "relink": ["--registry"], "fixed_base": "0x400000"},
-  "PPSA99004": {"name": "ProsperoAI", "relink": ["--trap-sdk-syscall-stubs"]},
-  "PPSA99008": {"name": "ProsperoEden", "relink": ["--trap-sdk-syscall-stubs"]},
-  "PPSA99011": {"name": "PS5 FSR4 Showcase", "relink": ["--trap-sdk-syscall-stubs"]},
-  "PPSA99169": {"name": "RetroArch", "executables": ["picker/picker.bin"]},
-  "PPSA99203": {"name": "PS5SX2", "relink": ["--trap-sdk-syscall-stubs"]},
-  "PPSA99288": {"name": "Nuvio Max'd", "relink": ["--trap-sdk-syscall-stubs"]},
-  "PPSA99360": {"name": "PS5CEMU-HAR", "relink": ["--trap-sdk-syscall-stubs"]}
+  "PPSA01153": {"relink": ["--trap-sdk-syscall-stubs"]},
+  "PPSA68091": {"relink": ["--registry"], "fixed_base": "0x400000"},
+  "PPSA69421": {"relink": ["--trap-sdk-syscall-stubs"]},
+  "PPSA85300": {"relink": ["--registry"], "fixed_base": "0x400000"},
+  "PPSA97358": {"relink": ["--registry"], "fixed_base": "0x400000"},
+  "PPSA99004": {"relink": ["--trap-sdk-syscall-stubs"]},
+  "PPSA99008": {"relink": ["--trap-sdk-syscall-stubs"]},
+  "PPSA99011": {"relink": ["--trap-sdk-syscall-stubs"]},
+  "PPSA99169": {"executables": ["picker/picker.bin"]},
+  "PPSA99203": {"relink": ["--trap-sdk-syscall-stubs"]},
+  "PPSA99288": {"relink": ["--trap-sdk-syscall-stubs"]},
+  "PPSA99360": {"relink": ["--trap-sdk-syscall-stubs"]}
 }