phase: 145_git_source_links

**Phase 145 final verification pass — all green, no code changes needed**

- **Verified (no defects found):** resolver `origin_for_source` + `_url_basename` (scp/`.git`/trailing-slash, sanitize, ambiguity WARNING); `origin:`/`branch:` lines in all four read shapes via shared `_origin_lines`; HIGH `<tools>` origin rule (verbatim + only-byte-change pins); `DocContent.origin_url/origin_branch` (absent-never-null serializer); `renderDocument` "Original" anchor (copyable verbatim URL, `_blank`/`noopener`, branch in title); mock scripted origin-link flow (disjoint trigger — grep-verified vs all other E2E files)
- **Tests:** `uv run pytest --cov=app --cov-report=term-missing` → 3402 passed, `app/` coverage **99%** (>90% gate); `uv run pytest tests/e2e/test_git_source_links.py -v --no-cov` → **4 passed** in isolation; `uv run ruff check .` → clean; `uv run pyright` → 0 errors, 0 warnings
- **Completion criteria:** (1) git read results carry origin/branch, local byte-identical — ✅ (unit pins + E2E control); (2) HIGH `<tools>` rule pinned, LOW byte-identical — ✅; (3) modal AND /document.html show Original link, branch in label when pinned, nothing for local — ✅; (4) full suite green + coverage + E2E + lint/types — ✅; (5) no completed-phase behavior change (read header line 1, mock prefix, done frame/SourceRef untouched, LOW sha) — ✅
- **Extra regression check:** re-ran shared-mock E2E suites `test_read_line_ranges.py` (2 passed) and `test_document_viewer.py` (8 passed) — no cross-suite regressions from the `mock_llm.py` addition
- **Documentation:** README.md reviewed in full (env table ⊇ `.env.example`, pages/routes, config defaults, scripts, 17-color palette, 300 s guard, 2 s sync poll, phase-145 provenance section matches implementation) and AGENTS.md (72rem container, no-CDN test, smoke test, gitignore, gates) — **verified consistent, no changes needed**
- **Notable:** phase-116 screenshot PNG was regenerated during this phase's E2E runs (byte re-encode only, visually identical, correct no-anchor local-source meta row) — left in tree for the harness commit
- **Next pending phase:** `146_search_tool_scope` (then 147, 148, 149)

app/rag/agent.py

@@ -280,7 +280,7 @@ from sqlalchemy.orm import Session
 from app.config import Settings
 from app.models import Document, FolderSummary
 from app.rag.folder_summaries import folder_of
-from app.rag.git_sources import effective_sources
+from app.rag.git_sources import effective_sources, origin_for_source
 from app.rag.llm import (
     LLMClient,
     LLMError,
@@ -362,8 +362,11 @@ AGENT_TOOLS: list[dict[str, Any]] = [
                 "first line) and `limit` (number of lines) to read "
                 "exactly that part. Do not re-read a document you have "
                 "already read in full — its full text is already in "
-                "your prompt. Call one tool at a time — wait for this "
-                "result before your next call."
+                "your prompt. For a document from a git source, the "
+                "result also carries an `origin` line (and `branch` "
+                "when pinned) — include that original source in your "
+                "answer (see your tools instructions). Call one tool at "
+                "a time — wait for this result before your next call."
             ),
             "parameters": {
                 "type": "object",
@@ -1272,6 +1275,32 @@ def _resolve_path(db: Session, combined: str) -> tuple[Document | None, str, str
     return find_document(db, source, path), source, path
 
 
+def _origin_lines(origin: tuple[str, str | None] | None) -> str:
+    """Phase 145 (task 01) — the read result's origin lines, shared by
+    the four result builders (the lines are identical in every shape).
+
+    ``None`` (the document's source has no unambiguous ``kind='git'``
+    row — a local source, zero matches, or an ambiguous basename) →
+    ``""``: the result stays byte-identical to pre-phase. Otherwise
+    one ``origin: {url}`` line (the sanitized repository URL — the
+    phase-121 mask, so a legacy embedded-credential row's secret never
+    reaches the prompt) and, when a branch is pinned (non-NULL), one
+    ``branch: {branch}`` line. The builders insert the block
+    IMMEDIATELY AFTER the ``date:`` line and BEFORE the image marker
+    (the marker keeps its phase-122 position relative to the content,
+    the origin lines ride above it); the FIRST line
+    (``Document {source}/{path}:``) is untouched — the E2E mock's
+    ``_READ_RESULT_PREFIX`` header contract.
+    """
+    if origin is None:
+        return ""
+    url, branch = origin
+    lines = f"origin: {url}\n"
+    if branch is not None:
+        lines += f"branch: {branch}\n"
+    return lines
+
+
 def all_documents(db: Session) -> list[Document]:
     """Every indexed document (full rows), ordered by ``(source, path)``
     — catalog order.
@@ -1728,6 +1757,14 @@ def _execute_tool(
         if (doc.source, doc.path) not in known:
             holder.read_docs.append(doc)
         holder.tool_calls += 1
+        # Phase 145 (task 01): the git-sourced document's repository
+        # origin — computed ONCE per successful read, BEFORE the
+        # ranged/truncated branching (the lines are identical in all
+        # four result shapes, which each render the shared block via
+        # :func:`_origin_lines`). ``None`` (local source, no git row,
+        # ambiguous basename) → no lines: the result stays
+        # byte-identical to pre-phase.
+        origin = origin_for_source(db, doc.source)
         # Phase 122 (task 05): an image document's content IS the vision
         # description — the marker line (a third line between the
         # byte-identical header/date lines and the text) tells the model
@@ -1775,6 +1812,7 @@ def _execute_tool(
                 return (
                     f"Document {doc.source}/{doc.path}:\n"
                     f"date: {doc.created_at:%Y-%m-%d}\n"
+                    f"{_origin_lines(origin)}"
                     f"{marker}"
                     f"{doc.content[:cap]}\n"
                     f"{TRUNCATION_MARKER}\n"
@@ -1792,6 +1830,7 @@ def _execute_tool(
             return (
                 f"Document {doc.source}/{doc.path}:\n"
                 f"date: {doc.created_at:%Y-%m-%d}\n"
+                f"{_origin_lines(origin)}"
                 f"{marker}"
                 f"{doc.content}"
             )
@@ -1829,6 +1868,7 @@ def _execute_tool(
             return (
                 f"Document {doc.source}/{doc.path}:\n"
                 f"date: {doc.created_at:%Y-%m-%d}\n"
+                f"{_origin_lines(origin)}"
                 f"lines: {first}-{end} of {total_lines}\n"
                 f"{marker}{slice_text[:cap]}\n"
                 f"{TRUNCATION_MARKER}\n"
@@ -1842,6 +1882,7 @@ def _execute_tool(
         return (
             f"Document {doc.source}/{doc.path}:\n"
             f"date: {doc.created_at:%Y-%m-%d}\n"
+            f"{_origin_lines(origin)}"
             f"lines: {first}-{end} of {total_lines}\n"
             f"{marker}{slice_text}"
         )

app/rag/git_sources.py

@@ -86,6 +86,83 @@ def sanitize_url(url: str) -> str:
     return _USERINFO_RE.sub(r"\1", url, count=1)
 
 
+def _url_basename(url: str) -> str:
+    """Phase 145 (task 01) — the repository directory a git row's URL
+    imports into.
+
+    The URL's path component — after the ``://``, or after the ``:``
+    for scp-style ``git@host:owner/repo`` (the port-carrying
+    ``ssh://user@host:22/…`` form already fell into the ``://``
+    branch) — with trailing ``/`` stripped, a single trailing ``.git``
+    suffix stripped, and the last segment taken. The importer clones
+    into (and names the source after) exactly this basename
+    (``source = root.name``), so it is the join key between a
+    document's ``source`` name and the ``git_sources`` row whose clone
+    produced it. An ``@`` inside the *path* is not userinfo and is
+    never treated as one (no split, no strip).
+    """
+    rest = url
+    if "://" in rest:
+        rest = rest.partition("://")[2]
+    elif ":" in rest:
+        # scp-style ``git@host:owner/repo`` — the path component starts
+        # after the colon (``host:port`` has no other form here: the
+        # only colon-carrying scheme without ``//`` is the scp one).
+        rest = rest.partition(":")[2]
+    rest = rest.rstrip("/")
+    if rest.endswith(".git"):
+        rest = rest[: -len(".git")]
+    return rest.rsplit("/", 1)[-1]
+
+
+def origin_for_source(db: Session, source_name: str) -> tuple[str, str | None] | None:
+    """Phase 145 (task 01) — the origin a read result of *source_name*
+    documents carries: the sanitized repository URL (and the pinned
+    branch, when one exists), or ``None``.
+
+    The candidate rows are the ``kind='git'`` rows (local rows are
+    never origins — nothing to link to from the user's browser); a row
+    matches when its URL basename (:func:`_url_basename` — the clone
+    directory the importer names the source after) equals
+    ``source_name``.
+
+    * EXACTLY ONE match → ``(sanitize_url(row.url), row.branch)`` —
+      the phase-121 output mask keeps a legacy embedded-credential
+      row's secret out of the prompt (the stored value is never
+      modified — the :func:`clone_url_for` lesson), and ``branch`` is
+      the pinned branch or ``None`` (NULL = the default branch);
+    * zero matches, or TWO-OR-MORE (two repos sharing a basename) →
+      ``None`` + a WARNING log (the ambiguity names the sanitized
+      candidates) — never guess: the read result would otherwise
+      carry a wrong origin into every answer about the document, and
+      a ``None`` result is byte-identical to pre-phase.
+
+    Pure-DB helper — one query, no git subprocess
+    (``scripts/git_sync.py`` stays the only git-invocation site, PLAN
+    §13), no caching (the table is a handful of rows; a read's extra
+    query is trivial).
+    """
+    rows = db.scalars(select(GitSource).where(GitSource.kind == "git")).all()
+    candidates = [row for row in rows if _url_basename(row.url) == source_name]
+    if len(candidates) == 1:
+        row = candidates[0]
+        return sanitize_url(row.url), row.branch
+    if not candidates:
+        logger.warning(
+            "no git origin for source %r: no kind='git' row's URL basename matches",
+            source_name,
+        )
+        return None
+    logger.warning(
+        "ambiguous git origin for source %r: %d rows share the URL basename (%s) — "
+        "no origin line is added to its read results",
+        source_name,
+        len(candidates),
+        ", ".join(sanitize_url(row.url) for row in candidates),
+    )
+    return None
+
+
 def clone_url_for(row: GitSource) -> str:
     """Phase 121, LOCKED A2 — the URL git actually clones, with the
     row's credential injected ONLY here.

app/rag/prompts.py

@@ -231,6 +231,40 @@ SUGGEST_INTRO = (
 #: summaries are the starting points, not the content; ``grep`` with
 #: only ``pattern`` searches the whole knowledge base, and a source
 #: name is not a document.
+#: Phase 145 (task 02) — the original-source rule the ``read`` teaching
+#: carries (LOCKED verbatim — pinned in :mod:`tests.unit.test_prompt_lock`
+#: and :mod:`tests.unit.test_prompts`). :data:`TOOLS_SECTION` embeds this
+#: exact sentence-group at the ``read`` clause's end (the truncation
+#: workflow sentence) and BEFORE the ``grep`` clause begins; the
+#: cross-pins (``TOOLS_SECTION`` minus this rule reproduces the
+#: pre-phase-145 bytes; ``count == 1`` + the boundary substring) keep
+#: the embedded copy and this constant byte-identical. A read result for
+#: a git-sourced document carries an ``origin:`` line (and a ``branch:``
+#: line when a branch is pinned) — the read contract's fact — so when
+#: the answer uses such a document it includes the original source: a
+#: link to the repository (the ``origin`` line) with the document's path
+#: (the ``Document …`` header) named and the pinned branch when one is
+#: shown, as the repository's file-view URL where the model can tell it
+#: (``<repo-url>/blob/<branch>/<path>``), or the repository URL plus the
+#: path as plain text otherwise — the user opens the complete original
+#: from the answer in one step, not a second question. The rule is
+#: CONDITIONAL on the ``origin`` line's presence — a local-sourced
+#: document's read result carries none, so the rule adds nothing to
+#: those answers (the model has no URL to cite; it must not invent one —
+#: the sentence's conditioning does that job).
+ORIGIN_RULE: str = (
+    "A read result for a document from a git source carries an origin line "
+    "(and a branch line when a branch is pinned): when your answer uses "
+    "such a document, include the original source in the answer — a link "
+    "to the repository from the origin line, with the document's path "
+    "(from the Document header) named and the pinned branch when one is "
+    "shown — as the repository's file-view URL where you can tell it "
+    "(for example <repo-url>/blob/<branch>/<path>), or the repository "
+    "URL plus the path as plain text otherwise. The user should be able "
+    "to open the complete original from your answer in one step, not ask "
+    "again for the source."
+)
+
 TOOLS_SECTION: str = (
     "<tools>\n"
     "You may extend your context with three tools. `ls` lists the "
@@ -260,7 +294,17 @@ TOOLS_SECTION: str = (
     "are capped: a "
     "cut read returns the first part plus a TRUNCATED notice — the "
     "document did not end where it stopped; use `grep` (pattern) to "
-    "find the rest, it searches the whole document. `grep` locates an exact string "
+    "find the rest, it searches the whole document. A read result for a "
+    "document from a git source carries an origin line (and a branch line "
+    "when a branch is pinned): when your answer uses such a document, "
+    "include the original source in the answer — a link to the "
+    "repository from the origin line, with the document's path (from the "
+    "Document header) named and the pinned branch when one is shown — as "
+    "the repository's file-view URL where you can tell it (for example "
+    "<repo-url>/blob/<branch>/<path>), or the repository URL plus the "
+    "path as plain text otherwise. The user should be able to open the "
+    "complete original from your answer in one step, not ask again for "
+    "the source. `grep` locates an exact string "
     "(case-insensitive) in the indexed documents and returns up to 20 "
     "matching `source/path:line: text` lines — a locator, not a "
     "context-adder: read the winner with `read`. A grep pattern is a "