tools/bugreport: --bundle/--chronology tauscht die Chronologie eines vorhandenen Bündels - Geheimnisse, Titelschutz und Pseudonyme wie beim Sammeln, kein wikitool-Aufruf, kein zweites Bündel; bug-report.md prüft die Chronologie vor dem Sammeln und nennt den Austausch als Entscheidungspunkt (#220); 10.1.0-beta.15

Files changed:
- CHANGES.md
- VERSION
- docs/how-to/troubleshoot.md
- instructions/bug-report.md
- tools/README.md
- tools/bugreport.py
- tools/chemenu/tests/test_bugreport.py

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

CHANGES.md

@@ -14,7 +14,7 @@ place only: `instructions/dev/version-parts.md` § The candidate model.
 
 ---
 
-## 10.1.0-beta.14 - 2026-10-16 - gates.md/session-setup.md: die Regel für eine neue Session-Id steht nur noch in gates.md, mit dem ausdrücklich gewünschten weiteren Ingest-Lauf als zweiter Grenze neben plan.md (#219)
+## 10.1.0-beta.15 - 2026-10-16 - tools/bugreport: eine nach dem Sammeln korrigierte Chronologie wird mit --bundle/--chronology in das vorhandene Bündel getauscht (gleiche Verarbeitung, kein zweiter Lauf, kein zweites Bündel); bug-report.md prüft die Chronologie vor dem Sammeln (#220)
 
 **Author:** Torben Nehmer
 
@@ -28,6 +28,7 @@ place only: `instructions/dev/version-parts.md` § The candidate model.
 - wiki-query liest den Wortlaut geführt in der Rohdatei nach: über Seite, Source-Seite und Gliederung der Ableitung bis zum Zeilenbereich, nie freies Suchen in raw/; kb/CONTRACT.md präzisiert das Qualitätsziel auf die Substanz (#227)
 - export run: commit= im Marker je Seite statt je Ziel - ein Commit schreibt nur die Dateien der Seiten neu, die er berührt hat; der erste Lauf nach dem Update schreibt jede Datei einmal neu (#221)
 - wiki-ingest: ein Lauf endet nach einer Quelle mit Stopp und /clear-Empfehlung - keine Schleife über mehrere Einträge im selben Kontext; capture-session delegiert wiki-ingest nicht mehr an Subagents (#219)
+- tools/bugreport: eine nach dem Sammeln korrigierte Chronologie wird mit --bundle/--chronology in das vorhandene Bündel getauscht (gleiche Verarbeitung, kein zweiter Lauf, kein zweites Bündel); bug-report.md prüft die Chronologie vor dem Sammeln (#220)
 
 **Low impact**
 - instructions/dev: Konverter-Vergleich – eigene Ableitung gegen Referenzwerkzeuge am privaten Korpus, mit Grundlinie

VERSION

@@ -1 +1 @@
-10.1.0-beta.14
+10.1.0-beta.15

docs/how-to/troubleshoot.md

@@ -7,6 +7,20 @@ names its own stops - what is missing, why, and the command that fixes it - and
 For the MCP read server, see the troubleshooting section of
 [Set up the MCP read server](set-up-the-mcp-server.md#troubleshooting).
 
+<!-- wikitool:toc -->
+## Contents
+
+- [`tools/wikitool` ends with `STOP - this checkout is not set up yet` (exit 42)](#toolswikitool-ends-with-stop---this-checkout-is-not-set-up-yet-exit-42)
+- [The agent offers no skills (`wiki-ingest`, `wiki-query`, ...)](#the-agent-offers-no-skills-wiki-ingest-wiki-query)
+- [`doctor` reports `personalization: FAIL`](#doctor-reports-personalization-fail)
+- [`doctor` reports `environment: WARN`](#doctor-reports-environment-warn)
+- [`doctor` reports `telemetry: WARN`](#doctor-reports-telemetry-warn)
+- [`new` stops with "No author configured"](#new-stops-with-no-author-configured)
+- [`publish` ends with exit 42 (Mass-Update Gate)](#publish-ends-with-exit-42-mass-update-gate)
+- [`publish` ends with exit 42 (Publish-Remote Gate)](#publish-ends-with-exit-42-publish-remote-gate)
+- [Setup or an update fails, and you want to report it](#setup-or-an-update-fails-and-you-want-to-report-it)
+<!-- /wikitool:toc -->
+
 ## `tools/wikitool` ends with `STOP - this checkout is not set up yet` (exit 42)
 
 The preflight has not run in this checkout yet, or not since the last update. Run it:
@@ -94,4 +108,11 @@ The script writes a bundle to `reports/bugreport-<timestamp>/`, with a zip besid
   the checklist and the candidates file contain the originals, and they sit beside the bundle,
   never in it.
 
+- **Correcting the chronology afterwards:** if the chronology turns out wrong or missing once the
+  bundle exists, the agent swaps it with `tools/bugreport --bundle … --chronology …` instead of
+  collecting again. That changes only `CHRONOLOGY.md` and the zip - no `wikitool` command runs
+  again and no second bundle appears - and the new text is scrubbed, kept clear of titles and
+  pseudonymised like the rest. After a stage 2 run the agent reads the new chronology and runs
+  stage 2 once more for names it finds there.
+
 Nothing is uploaded anywhere. You choose the channel.

instructions/bug-report.md

@@ -47,6 +47,14 @@ four layers:
 `MANIFEST.md` lists every file and marks the ones that may contain page content and titles: the trace,
 the chronology and the transcripts.
 
+**A bundle is the output of one run.** Its `wikitool` outputs come from one moment. A chronology
+that is wrong or missing afterwards is swapped into the bundle that exists
+(`--bundle <dir> --chronology <file>`, see [Decision points](#decision-points)), never collected again: that changes
+`CHRONOLOGY.md` and the zip and nothing else, runs no `wikitool` command, and leaves no second bundle
+under `reports/` for the user to choose between. The new text goes through the same processing as at
+collection - secrets removed, page titles kept out unless the bundle was collected with `--titles`,
+and in a pseudonymised bundle every identity replaced from its mapping.
+
 Two rules hold for everything the script generates itself. **Secrets are always removed**: values of
 keys that look like a token, password, secret, key or auth entry, credentials in URLs, and every value
 of that kind found while collecting is also replaced wherever else it turns up. **Page titles are kept
@@ -96,6 +104,12 @@ session. The bundle does not leave that place because of it.
    [template](#chronology-template) below. Facts only - no diagnosis. If the session's own history is
    too long to reconstruct, say what is missing instead of filling the gap.
 
+   **Check the chronology against the template before you collect.** Each step carries its command
+   literally, as it ran - no placeholder and no abbreviation such as `types describe <entity|concept|...>` -
+   with its exit code and the first relevant line of output, verbatim. Fix it now: it is the
+   cheap place to do so. Once the bundle exists, a correction is the swap in
+   [Decision points](#decision-points).
+
 3. **Run the collector** through its launcher, which finds a Python 3.8 or later itself:
 
    ```bash
@@ -131,8 +145,8 @@ session. The bundle does not leave that place because of it.
    one, in the session. The exception it gets in [gates.md](gates.md) § "Taking a new session id"
    belongs to the script alone.
 
-6. **Report the result.** Quote the bundle path, the archive path and the privacy notice the script
+6. **Report the result.** Name exactly one bundle: quote its path, the archive path and the privacy
-   prints, name the gaps in `MANIFEST.md`, and tell the user to read the bundle before sharing it.
+   notice the script prints (after a swap, the one the swap printed), name the gaps in `MANIFEST.md`, and tell the user to read the bundle before sharing it.
    After stage 2, name the residual uncertainty in words of your own: stage 2 is a model's judgement
    and can have missed names, above all in the free text of a trace or transcript over 100 KB.
    Say that the mapping, the review list and the candidate file hold originals and stay on this
@@ -172,6 +186,15 @@ Facts only: no page content, no guessed cause, no advice.
 - **The mapping is gone before stage 2?** Stage 2 refuses: it needs the salt stage 1 used, or it would
   replace a word differently from the path it already replaced. Collect the report again with
   `--pseudonymise`.
+- **The chronology is wrong, incomplete or missing after collecting?** Write the corrected file and
+  run `tools/bugreport --bundle reports/bugreport-<stamp> --chronology <file>`. **Never collect a
+  second time**: that makes a second bundle with `wikitool` outputs from another moment, and nothing
+  says which one counts. The swap works on a bundle collected without a chronology too (it adds
+  one). Add `--root <dir>` if the checkout is not the one holding `tools/`. If stage 2 had already
+  run, read the new `CHRONOLOGY.md` completely and run stage 2 again with the names you now find
+  there. If the swap exits 1 because the mapping is gone, handle it like "The mapping is gone"
+  above: collect again with `--pseudonymise`, and then say in the report which earlier bundle is
+  superseded. Delete nothing under `reports/` yourself; which bundles to keep is the user's call.
 - **The user wants a name added after stage 2?** Run stage 2 again with a candidate file holding only
   that line. The same run also works when the human spots a name while reading the bundle.
 - **The user declines the trace?** Run with `--no-trace`. The manifest records the exclusion.

tools/README.md

@@ -148,6 +148,12 @@ exits 0 or 1 - never 42, since it opens no gate. It has a second mode: `--pseudo
 identities it can read from the machine (stage 1), and `--bundle`/`--candidates` applies names a
 model found in the result (stage 2), both word by word so that length, separators and depth
 survive. The mapping, the review list and the candidate file stay beside the bundle directory.
+A third mode, `--bundle`/`--chronology` (with `--root` if the checkout is not the one holding
+`tools/`), swaps the chronology of a bundle that exists already: it runs no `wikitool` call and
+writes no second bundle, changes `CHRONOLOGY.md` and the zip (and the review list of a
+pseudonymised bundle), and puts the new text through the same secret scrub, title shield and
+pseudonyms the collection would have. A bundle collected without a chronology gets one, and its
+manifest changes in three fixed places.
 `dist export` ships it with the rest of `tools/`;
 its tests (`tests/test_bugreport.py`, in the origin repository) run it on a bare interpreter (`-I -S`) to keep that promise.
 

tools/bugreport.py

@@ -10,6 +10,7 @@ Runs on the base Python with the standard library only, and imports nothing from
                     [--session ID | --no-trace] [--titles]
                     [--pseudonymise] [--root DIR] [--out DIR]
     tools/bugreport --bundle DIR --candidates FILE
+    tools/bugreport --bundle DIR --chronology FILE [--root DIR]
 
 `tools/bugreport` (and `tools/bugreport.ps1` under PowerShell) finds a Python 3.8
 or newer and runs this file with it, skipping the Microsoft Store's aliases that
@@ -21,7 +22,9 @@ layers: the environment, the stack, what `wikitool` prints (if it starts), and
 the agent's chronology. Secrets are always removed. Page titles are kept out of
 everything this script generates unless `--titles` is given. With `--pseudonymise`
 known identities are replaced by consistent, shape-preserving placeholders (stage 1);
-`--bundle`/`--candidates` applies the names a model found beyond them (stage 2). The
+`--bundle`/`--candidates` applies the names a model found beyond them (stage 2).
+`--bundle`/`--chronology` swaps the chronology of a bundle that exists already, with the
+same processing and without a second run: no `wikitool` call, no second bundle. The
 mapping stays beside the bundle, never in it. Nothing is uploaded.
 
 Exit 0 = bundle written, 1 = it could not be written. No exit 42: this script
@@ -1171,15 +1174,25 @@ def build_manifest(args, root, stamp, bundle, wikitool, trace, gaps) -> str:
     return "\n".join(lines) + "\n"
 
 
+def clean_text(text: str, red: Redactor, shield) -> str:
+    """What every generated or supplied text goes through: secrets, then page titles."""
+    cleaned = red.scrub(text)
+    if shield is not None:
+        cleaned = shield.apply(cleaned)
+    return cleaned
+
+
+def title_shield(content_paths):
+    return TitleShield(rel for rel in content_paths if rel.rsplit("/", 1)[-1] not in STACK_NAMES)
+
+
 def final_pass(bundle_dir: Path, red: Redactor, shield, skip) -> None:
     for path in sorted(bundle_dir.rglob("*")):
         if not path.is_file():
             continue
         rel = path.relative_to(bundle_dir).as_posix()
         text = read_text(path)
-        cleaned = red.scrub(text)
+        cleaned = clean_text(text, red, None if rel in skip else shield)
-        if shield is not None and rel not in skip:
-            cleaned = shield.apply(cleaned)
         if cleaned != text:
             write_text(path, cleaned)
 
@@ -1210,22 +1223,32 @@ def parse_args(argv):
                         "placeholders (stage 1); the mapping stays beside the bundle")
     parser.add_argument("--root", help="checkout root (default: parent of tools/)")
     parser.add_argument("--out", help="output directory (default: <root>/reports)")
-    parser.add_argument("--bundle", help="stage 2: an existing pseudonymised bundle directory")
+    parser.add_argument("--bundle", help="an existing bundle directory: stage 2 with --candidates, "
+                        "a new chronology with --chronology")
     parser.add_argument("--candidates", help="stage 2: file with one further name per line "
                         "('#' starts a comment)")
     args = parser.parse_args(argv)
-    if bool(args.bundle) != bool(args.candidates):
+    if args.candidates and not args.bundle:
-        parser.error("--bundle and --candidates belong together")
+        parser.error("--candidates belongs with --bundle")
-    if args.bundle and (args.chronology or args.transcript or args.session or args.no_trace
+    if args.bundle:
-                        or args.titles or args.pseudonymise or args.root or args.out):
+        if args.candidates and args.chronology:
-        parser.error("--bundle/--candidates excludes every collection option")
+            parser.error("--bundle takes --candidates or --chronology, not both")
+        if not (args.candidates or args.chronology):
+            parser.error("--bundle needs --candidates (stage 2) or --chronology (swap)")
+        if (args.transcript or args.session or args.no_trace or args.titles
+                or args.pseudonymise or args.out or (args.candidates and args.root)):
+            parser.error("--bundle excludes every collection option "
+                         "(--root is allowed with --chronology only)")
     return args
 
 
 def main(argv=None) -> int:
     args = parse_args(argv)
-    if args.bundle:
+    if args.bundle and args.candidates:
         return run_stage2(Path(args.bundle), Path(args.candidates))
+    if args.bundle:
+        root = Path(args.root).resolve() if args.root else Path(__file__).resolve().parent.parent
+        return run_exchange(Path(args.bundle), Path(args.chronology), root)
     root = Path(args.root).resolve() if args.root else Path(__file__).resolve().parent.parent
     out = Path(args.out).resolve() if args.out else root / "reports"
 
@@ -1308,9 +1331,7 @@ def _collect(args, root: Path, out: Path, stamp: str, bundle_dir: Path) -> int:
 
     shield = None
     if not args.titles:
-        shield = TitleShield(
+        shield = title_shield(content_paths)
-            rel for rel in content_paths if rel.rsplit("/", 1)[-1] not in STACK_NAMES
-        )
     final_pass(bundle_dir, red, shield, {"tree-paths.txt"})
 
     pz = None
@@ -1354,25 +1375,30 @@ def parse_candidates(text: str):
     return names
 
 
+def load_pseudonymiser(mapping: Path):
+    """The pseudonymiser stage 1 left beside a bundle, or the reason it cannot be had."""
+    if not mapping.is_file():
+        return None, ("no mapping beside the bundle (%s): stage 2 needs the salt stage 1 used, so "
+                      "collect the report again with --pseudonymise" % mapping.name)
+    try:
+        return Pseudonymiser.from_json(json.loads(read_text(mapping))), None
+    except (ValueError, KeyError) as exc:
+        return None, "the mapping cannot be read: %s" % exc
+
+
 def run_stage2(bundle_dir: Path, candidates: Path) -> int:
     bundle_dir = bundle_dir.resolve()
     mapping = _sibling(bundle_dir, ".pseudonyms.json")
-    problem = None
+    pz, problem = None, None
     if not bundle_dir.is_dir():
         problem = "bundle directory not found: %s" % bundle_dir
     elif not candidates.is_file():
         problem = "candidates file not found: %s" % candidates
-    elif not mapping.is_file():
+    else:
-        problem = ("no mapping beside the bundle (%s): stage 2 needs the salt stage 1 used, so "
+        pz, problem = load_pseudonymiser(mapping)
-                   "collect the report again with --pseudonymise" % mapping.name)
     if problem:
         sys.stderr.write("bugreport: %s\n" % problem)
         return 1
-    try:
-        pz = Pseudonymiser.from_json(json.loads(read_text(mapping)))
-    except (ValueError, KeyError) as exc:
-        sys.stderr.write("bugreport: the mapping cannot be read: %s\n" % exc)
-        return 1
 
     files = text_files(bundle_dir)
     corpus = "\n".join(read_text(path) for path in files)
@@ -1424,6 +1450,105 @@ def run_stage2(bundle_dir: Path, candidates: Path) -> int:
     return 0
 
 
+TITLES_LINE = re.compile(r"(?m)^- page titles \(`--titles`\): (included|kept out)$")
+PSEUDONYMISATION_LINE = re.compile(r"(?m)^- pseudonymisation \(`--pseudonymise`\): (.*)$")
+CHRONOLOGY_ROW = ("| `CHRONOLOGY.md` | 4 | the agent's chronology | %s |" % MAY_CONTAIN_CONTENT)
+NO_CHRONOLOGY_GAP = "- no chronology was supplied"
+
+
+def manifest_with_chronology(manifest: str) -> str:
+    """The three fixed places a bundle collected without a chronology changes in."""
+    manifest = manifest.replace("- chronology: not supplied", "- chronology: supplied", 1)
+    lines = manifest.split("\n")
+    if CHRONOLOGY_ROW not in lines:
+        end = lines.index("| `MANIFEST.md` | - | this file | |")
+        at = end
+        for index in range(end - 1, -1, -1):
+            if not lines[index].startswith("| `"):
+                break
+            if lines[index].split("`")[1] > "CHRONOLOGY.md":
+                at = index
+        lines.insert(at, CHRONOLOGY_ROW)
+    sections = re.split(r"(?m)^(?=## )", "\n".join(lines))
+    kept = []
+    for section in sections:
+        if section.startswith("## Gaps\n"):
+            bullets = [ln for ln in section.splitlines()[1:] if ln.strip() and ln != NO_CHRONOLOGY_GAP]
+            if not bullets:
+                continue
+            section = "\n".join(["## Gaps", ""] + bullets) + "\n"
+        kept.append(section)
+    return "\n\n".join(part.strip("\n") for part in kept if part.strip()) + "\n"
+
+
+def run_exchange(bundle_dir: Path, chronology: Path, root: Path) -> int:
+    """Swap (or add) CHRONOLOGY.md of an existing bundle: no wikitool call, no second bundle."""
+    bundle_dir = bundle_dir.resolve()
+    manifest_path = bundle_dir / "MANIFEST.md"
+    problem, manifest, titles = None, "", None
+    if not bundle_dir.is_dir():
+        problem = "bundle directory not found: %s" % bundle_dir
+    elif not chronology.is_file():
+        problem = "chronology file not found: %s" % chronology
+    elif not manifest_path.is_file():
+        problem = "no MANIFEST.md in %s: not a bundle of this script" % bundle_dir
+    else:
+        manifest = read_text(manifest_path)
+        titles = TITLES_LINE.search(manifest)
+        if titles is None:
+            problem = "MANIFEST.md in %s has no page titles line: not a bundle of this script" % bundle_dir
+    pz, pseudonymisation = None, PSEUDONYMISATION_LINE.search(manifest)
+    if problem is None and pseudonymisation is not None:
+        pz, problem = load_pseudonymiser(_sibling(bundle_dir, ".pseudonyms.json"))
+    if problem:
+        sys.stderr.write("bugreport: %s\n" % problem)
+        return 1
+
+    # Everything is worked out in memory first; nothing is written before it all succeeded.
+    red = Redactor()
+    guarded(collect_environment, root, red)
+    guarded(collect_stack, root, red)
+    shield = None
+    if titles.group(1) == "kept out":
+        shield = title_shield(f for name in CONTENT_DIRS for f in _safe_scan(root, name)[1])
+    text = clean_text(read_text(chronology), red, shield)
+    if pz is not None:
+        text = pz.apply(text)
+    target = bundle_dir / "CHRONOLOGY.md"
+    added = not target.is_file()
+    new_manifest = manifest_with_chronology(manifest) if added else None
+
+    archive = bundle_dir.with_name(bundle_dir.name + ".zip")
+    review = _sibling(bundle_dir, ".review.txt")
+    try:
+        write_text(target, text)
+        if new_manifest is not None:
+            write_text(manifest_path, new_manifest)
+        if pz is not None:
+            write_text(review, build_review(bundle_dir, pz))
+        temporary = archive.with_name(archive.name + ".tmp")
+        make_zip(bundle_dir, temporary)
+        os.replace(str(temporary), str(archive))
+    except OSError as exc:
+        sys.stderr.write("bugreport: cannot write the bundle: %s\n" % exc)
+        return 1
+
+    print("Bundle:  %s" % bundle_dir)
+    print("Archive: %s" % archive)
+    if pz is not None:
+        print("Review:  %s" % review)
+        print("Read CHRONOLOGY.md and the review list again, then run stage 2: "
+              "tools/bugreport --bundle %s --candidates <file>" % bundle_dir)
+    print()
+    if pz is None:
+        print(PRIVACY_NOTICE)
+    elif "stage 1 and stage 2 applied" in pseudonymisation.group(1):
+        print(RESIDUAL_NOTICE)
+    else:
+        print(STAGE1_NOTICE)
+    return 0
+
+
 def _safe_scan(root: Path, name: str):
     try:
         return scan_tree(root, name)

tools/chemenu/tests/test_bugreport.py

@@ -557,3 +557,171 @@ def test_bundle_and_candidates_exclude_the_collection_options(checkout, tmp_path
 def test_without_the_flag_nothing_but_the_bundle_and_its_archive_is_written(checkout, tmp_path):
     collect(checkout, tmp_path, "--no-trace")
     assert sorted(p.suffix for p in (tmp_path / "out").iterdir()) == ["", ".zip"]
+
+
+# ------------------------------------------------------------ swapping the chronology
+
+
+def swap(bundle: Path, chronology: Path, *extra: str) -> int:
+    return bugreport.main(["--bundle", str(bundle), "--chronology", str(chronology), *extra])
+
+
+def entries(out: Path) -> list:
+    return sorted(p.name for p in out.iterdir())
+
+
+def archive_bytes(bundle: Path) -> bytes:
+    return bundle.with_name(bundle.name + ".zip").read_bytes()
+
+
+def test_a_swapped_chronology_changes_nothing_else_and_makes_no_second_bundle(checkout, tmp_path):
+    old = tmp_path / "old.md"
+    old.write_text("1. `types describe <entity|concept|...>`\n")
+    bundle = collect(checkout, tmp_path, "--no-trace", "--chronology", str(old))
+    before, listing = snapshot(bundle), entries(tmp_path / "out")
+    new = tmp_path / "new.md"
+    new.write_text("1. `types describe entity` - exit 0\n")
+    assert swap(bundle, new, "--root", str(checkout)) == 0
+    after = snapshot(bundle)
+    assert after.pop("CHRONOLOGY.md") == b"1. `types describe entity` - exit 0\n"
+    assert before.pop("CHRONOLOGY.md") != b"1. `types describe entity` - exit 0\n"
+    assert after == before  # wikitool/*.txt and MANIFEST.md included
+    assert entries(tmp_path / "out") == listing
+    assert "types describe entity` - exit 0" in zip_text(bundle)
+    assert "<entity|concept" not in zip_text(bundle)
+
+
+def test_a_swapped_chronology_is_scrubbed_of_a_secret_from_a_config_file(checkout, tmp_path):
+    bundle = collect(checkout, tmp_path, "--no-trace")
+    new = tmp_path / "new.md"
+    new.write_text(f"1. Setup failed with {TOKEN} in the header\n")
+    assert swap(bundle, new, "--root", str(checkout)) == 0
+    text = (bundle / "CHRONOLOGY.md").read_text()
+    assert TOKEN not in text and "1. Setup failed" in text
+    assert TOKEN not in zip_text(bundle)
+
+
+def test_a_swapped_chronology_keeps_titles_out_unless_the_bundle_was_collected_with_them(
+    checkout, tmp_path
+):
+    new = tmp_path / "new.md"
+    new.write_text(f"see kb/Concepts/{TITLE}.md and [[{OTHER_TITLE}]]\n")
+    hidden = collect(checkout, tmp_path / "a", "--no-trace")
+    assert swap(hidden, new, "--root", str(checkout)) == 0
+    text = (hidden / "CHRONOLOGY.md").read_text()
+    assert TITLE not in text and OTHER_TITLE not in text and "[[<title" in text
+
+    shown = collect(checkout, tmp_path / "b", "--no-trace", "--titles")
+    assert swap(shown, new, "--root", str(checkout)) == 0
+    assert TITLE in (shown / "CHRONOLOGY.md").read_text()
+
+
+def test_a_swapped_chronology_in_a_pseudonymised_bundle_uses_both_stages_and_the_same_mapping(
+    checkout, tmp_path, monkeypatch, capsys
+):
+    first = tmp_path / "first.md"
+    first.write_text("Kunde Acme Corp zahlt.\n")
+    bundle = pseudonymised(checkout, tmp_path, monkeypatch, "--chronology", str(first))
+    candidates = tmp_path / "candidates.txt"
+    candidates.write_text("Acme Corp\n")
+    assert bugreport.main(["--bundle", str(bundle), "--candidates", str(candidates)]) == 0
+    stage_two_word = (bundle / "CHRONOLOGY.md").read_text().split()[1]
+    mapping, review = mapping_of(bundle).read_bytes(), bundle.with_name(bundle.name + ".review.txt")
+    review.write_text("stale\n")
+    manifest_before = (bundle / "MANIFEST.md").read_bytes()
+
+    new = tmp_path / "new.md"
+    new.write_text("Acme Corp hat Erika Mustermann angerufen\n")
+    capsys.readouterr()
+    assert swap(bundle, new, "--root", str(checkout)) == 0
+    text = (bundle / "CHRONOLOGY.md").read_text()
+    for original in ("Acme", "Erika", "Mustermann"):
+        assert original not in text and original not in zip_text(bundle)
+    assert text.startswith(stage_two_word + " ")  # same placeholder as the stage 2 run gave
+    assert mapping_of(bundle).read_bytes() == mapping
+    assert (bundle / "MANIFEST.md").read_bytes() == manifest_before
+    assert review.read_text() != "stale\n"
+    printed = capsys.readouterr().out
+    assert "Review:" in printed and "stage 1 and stage 2 applied" in printed
+
+
+def test_a_pseudonymised_bundle_without_its_mapping_is_left_as_it_was(
+    checkout, tmp_path, monkeypatch, capsys
+):
+    bundle = pseudonymised(checkout, tmp_path, monkeypatch)
+    mapping_of(bundle).unlink()
+    before, archive = snapshot(bundle), archive_bytes(bundle)
+    new = tmp_path / "new.md"
+    new.write_text("Erika\n")
+    assert swap(bundle, new, "--root", str(checkout)) == 1
+    assert "collect the report again" in capsys.readouterr().err
+    assert snapshot(bundle) == before and archive_bytes(bundle) == archive
+
+
+def test_a_swap_adds_a_missing_chronology_and_touches_the_manifest_in_three_places(
+    checkout, tmp_path
+):
+    bundle = collect(checkout, tmp_path, "--no-trace")
+    assert not (bundle / "CHRONOLOGY.md").exists()
+    before = snapshot(bundle)
+    new = tmp_path / "new.md"
+    new.write_text("1. `doctor` - exit 1\n")
+    assert swap(bundle, new, "--root", str(checkout)) == 0
+    after = snapshot(bundle)
+    assert after.pop("CHRONOLOGY.md") == b"1. `doctor` - exit 1\n"
+    manifest_before, manifest_after = before.pop("MANIFEST.md"), after.pop("MANIFEST.md")
+    assert after == before
+    old_lines, new_lines = manifest_before.decode().splitlines(), manifest_after.decode().splitlines()
+    removed = [ln for ln in old_lines if ln not in new_lines]
+    added = [ln for ln in new_lines if ln not in old_lines]
+    assert sorted(removed) == ["## Gaps", "- chronology: not supplied", "- no chronology was supplied"]
+    assert sorted(added) == [
+        "- chronology: supplied",
+        "| `CHRONOLOGY.md` | 4 | the agent's chronology | may contain page content and titles |",
+    ]
+    files = new_lines[new_lines.index("## Files"):]
+    assert files[4].startswith("| `CHRONOLOGY.md`")  # sorted like build_manifest sorts
+    assert new_lines[-1] == "| `MANIFEST.md` | - | this file | |"
+    assert "`doctor` - exit 1" in zip_text(bundle)
+
+
+def test_a_swap_keeps_the_other_gaps(checkout, tmp_path, monkeypatch):
+    monkeypatch.setattr(bugreport, "launcher_command", lambda root: None)
+    bundle = collect(checkout, tmp_path, "--no-trace")
+    new = tmp_path / "new.md"
+    new.write_text("text\n")
+    assert swap(bundle, new, "--root", str(checkout)) == 0
+    manifest = (bundle / "MANIFEST.md").read_text()
+    assert "## Gaps" in manifest and "no launcher found" in manifest
+    assert "no chronology was supplied" not in manifest
+
+
+def test_a_swap_with_a_missing_file_or_no_manifest_changes_nothing(checkout, tmp_path, capsys):
+    bundle = collect(checkout, tmp_path, "--no-trace")
+    before, archive = snapshot(bundle), archive_bytes(bundle)
+    assert swap(bundle, tmp_path / "nowhere.md", "--root", str(checkout)) == 1
+    assert "chronology file not found" in capsys.readouterr().err
+    new = tmp_path / "new.md"
+    new.write_text("text\n")
+    (bundle / "MANIFEST.md").unlink()
+    before.pop("MANIFEST.md")
+    assert swap(bundle, new, "--root", str(checkout)) == 1
+    assert "MANIFEST.md" in capsys.readouterr().err
+    (bundle / "MANIFEST.md").write_text("# Bug report bundle\n")
+    assert swap(bundle, new, "--root", str(checkout)) == 1
+    assert "not a bundle of this script" in capsys.readouterr().err
+    assert not (bundle / "CHRONOLOGY.md").exists()
+    assert archive_bytes(bundle) == archive
+
+
+def test_bundle_takes_exactly_one_of_candidates_and_chronology(checkout, tmp_path):
+    with pytest.raises(SystemExit):
+        bugreport.main(["--bundle", "b", "--candidates", "c", "--chronology", "x"])
+    with pytest.raises(SystemExit):
+        bugreport.main(["--bundle", "b"])
+    for extra in (["--no-trace"], ["--titles"], ["--pseudonymise"], ["--session", "s"],
+                  ["--transcript", "t"], ["--out", str(tmp_path)]):
+        with pytest.raises(SystemExit):
+            bugreport.main(["--bundle", "b", "--chronology", "x", *extra])
+    with pytest.raises(SystemExit):
+        bugreport.main(["--bundle", "b", "--candidates", "c", "--root", str(checkout)])