feat(cli): non-zero exit codes on partial export failure

README.md

@@ -93,6 +93,14 @@ python scripts/export.py --project boost-capy
 
 The `--project` flag matches a **case-insensitive substring** of either the **Project** column from `list` (derived from the session working directory) or the internal directory name under `~/.claude/projects/` (for example `F--boost-capy` or `d--harbor-forge`). A substring like `boost-capy` matches `F--boost-capy`; you can also paste the friendly name shown in `list`.
 
+**Exit codes** (`export` subcommand; stderr prints `Exported N of M sessions (K failed)` when any session was attempted):
+
+| Code | Meaning |
+|------|---------|
+| 0 | All attempted sessions exported successfully, or nothing to export with no errors |
+| 1 | Total failure — no sessions exported, one or more errors |
+| 2 | Partial failure — some sessions exported, some failed |
+
 ## Data Source
 
 Reads from `~/.claude/projects/` which contains JSONL session files created by Claude Code.

scripts/export.py

@@ -10,6 +10,11 @@
     export.py --format json --no-zip   # JSON files instead of zip
     export.py --since incremental      # only sessions new/changed since last run (mtime)
     export.py --since last             # all sessions active on latest UTC calendar day
+
+Exit codes (export subcommand):
+  0 — all sessions exported successfully (or nothing to export, no errors)
+  1 — total failure (no sessions exported; one or more errors)
+  2 — partial failure (some sessions exported, some failed)
 """
 
 import argparse
@@ -33,6 +38,7 @@
 from utils.exclusion_rules import resolve_exclusion_rules_path, load_rules
 from utils.slugify import slugify
 from utils.export_engine import (
+    BulkExportResult,
     ExportFormat,
     NoopSink,
     SinceMode,
@@ -393,6 +399,19 @@ def _aggregate_stats(base_dir: str, project_filter: str, fmt: str):
         print(f"  Est. cost:    ~${totals['total_cost']:.2f} USD")
 
 
+def _exit_bulk_export(result: BulkExportResult) -> None:
+    """Map bulk-export counts to process exit code (CLI wrapper only)."""
+    n = result.exported_session_count
+    m = result.total_candidates
+    k = result.failure_count
+    if m > 0 or n > 0 or k > 0:
+        print(f"Exported {n} of {m} sessions ({k} failed)", file=sys.stderr)
+    if n == 0 and k > 0:
+        sys.exit(1)
+    if k > 0:
+        sys.exit(2)
+
+
 def cmd_export(args):
     """The main export command. Writes md/json files, optionally zipped."""
     base_dir = getattr(args, "base_dir", None) or get_claude_projects_dir()
@@ -494,6 +513,7 @@ def _on_export_error(sid: str, exc: Exception) -> None:
                     "All sessions on disk were already at or before the last "
                     "recorded export time (nothing new to write)."
                 )
+        _exit_bulk_export(export_result)
         return
 
     os.makedirs(out_dir, exist_ok=True)
@@ -526,6 +546,7 @@ def _on_export_error(sid: str, exc: Exception) -> None:
 
     _save_state(last_export, count=len(manifest), out_dir=out_dir)
     print(f"State saved to {STATE_FILE}")
+    _exit_bulk_export(export_result)
 
 
 def _export_single(session: dict, stats: dict, fmt: str, out_dir: str):

tests/test_cli_export_exit_codes.py

@@ -0,0 +1,114 @@
+"""CLI export exit codes for bulk export (partial / total failure)."""
+
+from __future__ import annotations
+
+import re
+import sys
+import types
+from pathlib import Path
+
+import pytest
+
+REPO_ROOT = Path(__file__).resolve().parent.parent
+sys.path.insert(0, str(REPO_ROOT))
+
+import scripts.export as export  # noqa: E402
+from tests.test_cli_e2e import _run_cli, _seed_base_dir  # noqa: E402
+from utils.jsonl_parser import parse_session  # noqa: E402
+
+_SUMMARY_RE = re.compile(
+    r"Exported \d+ of \d+ sessions \(\d+ failed\)",
+)
+
+
+def _export_args(tmp_path: Path, base: Path, out_dir: Path) -> types.SimpleNamespace:
+    return types.SimpleNamespace(
+        base_dir=str(base),
+        out=str(out_dir),
+        since="all",
+        no_zip=True,
+        project=None,
+        format="md",
+        session=None,
+        exclude_rules=None,
+    )
+
+
+def test_cli_export_clean_exits_zero(tmp_path):
+    base = _seed_base_dir(tmp_path)
+    out_dir = tmp_path / "out"
+    proc = _run_cli([
+        "export",
+        "--base-dir",
+        str(base),
+        "--since",
+        "all",
+        "--no-zip",
+        "--out",
+        str(out_dir),
+    ])
+    assert proc.returncode == 0, proc.stderr
+    assert list(out_dir.rglob("*.md"))
+    if proc.stderr.strip():
+        assert "failed" not in proc.stderr.lower() or "0 failed" in proc.stderr
+
+
+def test_cli_export_partial_failure_exits_two(
+    tmp_path, monkeypatch, capsys
+):
+    """One session exports; a second fails parse (simulated corrupt file)."""
+    base = _seed_base_dir(tmp_path)
+    project_dir = next(base.iterdir())
+    bad = project_dir / "session_bad.jsonl"
+    bad.write_text('{"type": "user"}\n', encoding="utf-8")
+    out_dir = tmp_path / "out"
+
+    state_dir = tmp_path / "state"
+    state_dir.mkdir()
+    monkeypatch.setattr(export, "STATE_FILE", str(state_dir / "export_state.json"))
+    monkeypatch.setattr(export, "STATE_DIR", str(state_dir))
+
+    real_parse = parse_session
+
+    def _parse(path: str):
+        if bad.name in path.replace("\\", "/"):
+            raise ValueError("simulated corrupt jsonl")
+        return real_parse(path)
+
+    monkeypatch.setattr("utils.export_engine.parse_session", _parse)
+
+    with pytest.raises(SystemExit) as exc_info:
+        export.cmd_export(_export_args(tmp_path, base, out_dir))
+
+    assert exc_info.value.code == 2
+    captured = capsys.readouterr()
+    assert _SUMMARY_RE.search(captured.err), captured.err
+    assert "Exported 1 of 2 sessions (1 failed)" in captured.err
+    assert len(list(out_dir.rglob("*.md"))) == 1
+
+
+def test_cli_export_total_failure_exits_one(tmp_path, monkeypatch, capsys):
+    project_dir = tmp_path / "test-project"
+    project_dir.mkdir(parents=True)
+    (project_dir / "bad_a.jsonl").write_text("{}", encoding="utf-8")
+    (project_dir / "bad_b.jsonl").write_text("{}", encoding="utf-8")
+    out_dir = tmp_path / "out"
+
+    state_dir = tmp_path / "state"
+    state_dir.mkdir()
+    monkeypatch.setattr(export, "STATE_FILE", str(state_dir / "export_state.json"))
+    monkeypatch.setattr(export, "STATE_DIR", str(state_dir))
+
+    def _parse(_path: str):
+        raise ValueError("simulated corrupt jsonl")
+
+    monkeypatch.setattr("utils.export_engine.parse_session", _parse)
+
+    with pytest.raises(SystemExit) as exc_info:
+        export.cmd_export(_export_args(tmp_path, tmp_path, out_dir))
+
+    assert exc_info.value.code == 1
+    captured = capsys.readouterr()
+    assert "Exported 0 of 2 sessions (2 failed)" in captured.err
+    assert "Nothing to export." in captured.out
+    assert list(out_dir.rglob("*.md")) == []