diff --git a/graphify/detect.py b/graphify/detect.py
index d16b5800c..81c743155 100644
--- a/graphify/detect.py
+++ b/graphify/detect.py
@@ -43,7 +43,7 @@ class FileType(str, Enum):
 _MTIME_SUBSECOND_S = 0.05
 
 CODE_EXTENSIONS = {'.py', '.ts', '.tsx', '.mts', '.cts', '.js', '.jsx', '.mjs', '.cjs', '.ejs', '.ets', '.go', '.rs', '.java', '.groovy', '.gradle', '.cpp', '.cc', '.cxx', '.c', '.h', '.hpp', '.cu', '.cuh', '.metal', '.rb', '.rake', '.swift', '.kt', '.kts', '.cs', '.scala', '.php', '.lua', '.luau', '.toc', '.zig', '.ps1', '.psm1', '.psd1', '.ex', '.exs', '.m', '.mm', '.ml', '.mli', '.jl', '.vue', '.svelte', '.astro', '.dart', '.v', '.sv', '.svh', '.sql', '.r', '.f', '.F', '.f90', '.F90', '.f95', '.F95', '.f03', '.F03', '.f08', '.F08', '.pas', '.pp', '.dpr', '.dpk', '.lpr', '.inc', '.dfm', '.lfm', '.lpk', '.sh', '.bash', '.json', '.tf', '.tfvars', '.hcl', '.dm', '.dme', '.dmi', '.dmm', '.dmf', '.sln', '.slnx', '.csproj', '.fsproj', '.vbproj', '.xaml', '.razor', '.cshtml', '.cls', '.trigger', '.lisp', '.cl', '.lsp', '.asd'}
-DOC_EXTENSIONS = {'.md', '.mdx', '.qmd', '.skill', '.txt', '.rst', '.html', '.yaml', '.yml'}
+DOC_EXTENSIONS = {'.md', '.mdx', '.qmd', '.skill', '.txt', '.rst', '.html', '.yaml', '.yml', '.typ'}
 PAPER_EXTENSIONS = {'.pdf'}
 IMAGE_EXTENSIONS = {'.png', '.jpg', '.jpeg', '.gif', '.webp', '.svg'}
 OFFICE_EXTENSIONS = {'.docx', '.xlsx'}
diff --git a/graphify/file_slice.py b/graphify/file_slice.py
index 30dc49cfb..7af25a8c7 100644
--- a/graphify/file_slice.py
+++ b/graphify/file_slice.py
@@ -26,7 +26,10 @@
 # `_file_to_text` is a straight ``read_text`` (so a char range matches the bytes
 # the model is shown). Deliberately excludes code (.py, .ts, ...) and binary
 # docs (.pdf) — those are never sliced.
-_SPLITTABLE_TEXT_SUFFIXES = frozenset({".md", ".mdx", ".markdown", ".txt", ".rst"})
+# .typ (Typst) qualifies on both counts (#2826): it is prose source read straight
+# through `read_text`, and although its headings are `=`/`==` rather than `#`,
+# the blank-line and newline boundaries below still cut it at paragraph edges.
+_SPLITTABLE_TEXT_SUFFIXES = frozenset({".md", ".mdx", ".markdown", ".txt", ".rst", ".typ"})
 
 # Boundary preferences, strongest first. A Markdown heading (``\n#``) keeps a
 # section with its title; a blank line keeps a paragraph intact; a bare newline
diff --git a/tests/test_detect.py b/tests/test_detect.py
index 94642424b..5dc98ee67 100644
--- a/tests/test_detect.py
+++ b/tests/test_detect.py
@@ -49,6 +49,32 @@ def test_classify_skill():
     # #1901: .skill agent files (Markdown with YAML frontmatter) were dropped as unclassified.
     assert classify_file(Path("10_Orchestrator.skill")) == FileType.DOCUMENT
 
+def test_classify_typst():
+    # #2826: Typst is a prose authoring format, but .typ was in no extension set,
+    # so a repo whose report/spec chapters are written in Typst lost all of them.
+    assert classify_file(Path("main.typ")) == FileType.DOCUMENT
+
+def test_typst_is_watched():
+    # watch derives _WATCHED_EXTENSIONS from DOC_EXTENSIONS, so a new document
+    # type must also trigger an incremental rebuild when it is edited (#2826).
+    from graphify.watch import _WATCHED_EXTENSIONS
+    assert ".typ" in _WATCHED_EXTENSIONS
+
+def test_detect_surfaces_typst_chapters_as_documents(tmp_path):
+    """The reported symptom (#2826): a Typst-authored report reaches the corpus.
+
+    Classification alone is not the promise — the file has to come back out of
+    ``detect()`` in the document set, which is what was empty for the reporter.
+    """
+    (tmp_path / "main.typ").write_text(
+        "= Test Report\n\nProse documentation authored in Typst.\n", encoding="utf-8")
+    (tmp_path / "chapter.typ").write_text(
+        "== Measurements\n\nMore prose.\n", encoding="utf-8")
+
+    docs = detect(tmp_path)["files"]["document"]
+
+    assert sorted(Path(d).name for d in docs) == ["chapter.typ", "main.typ"]
+
 def test_classify_pdf():
     assert classify_file(Path("paper.pdf")) == FileType.PAPER
 
diff --git a/tests/test_file_slice.py b/tests/test_file_slice.py
index 619ffc1f4..e69692dfa 100644
--- a/tests/test_file_slice.py
+++ b/tests/test_file_slice.py
@@ -91,6 +91,24 @@ def test_expand_does_not_slice_code_even_when_oversized(tmp_path):
     assert units == [f]  # stays whole — code needs whole-symbol context
 
 
+def test_expand_oversized_typst_is_sliced_with_full_coverage(tmp_path):
+    """#2826: Typst chapters are prose, so an oversized one must slice, not truncate.
+
+    Typst marks headings with `=` rather than `#`, so the heading separator never
+    fires — the blank-line boundary carries it, which is the same fallback a .txt
+    document relies on.
+    """
+    text = ("= Section\n\n" + "word " * 200 + "\n\n") * 30
+    f = _write(tmp_path / "report.typ", text)
+    assert is_splittable_text(f)
+    units = expand_oversized_files([f], max_chars=2000)
+    slices = [u for u in units if isinstance(u, FileSlice)]
+    assert len(slices) >= 2
+    assert "".join(read_slice_text(s) for s in slices) == text
+    assert all((s.end - s.start) <= 2000 for s in slices)
+    assert all(s.path == f for s in slices)
+
+
 def test_expand_unreadable_file_passes_through(tmp_path):
     missing = tmp_path / "nope.md"
     units = expand_oversized_files([missing], max_chars=10)