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FabledScribe/tests/test_mcp_tool_rulebooks.py
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feat(rules): the history is readable — service, REST and MCP (#3242, milestone 323 step 3)
`list_rule_versions` / `get_rule_version` in the rulebooks service, a pair of
REST routes beside the note-version ones, and an MCP `rule_history` tool.

The ACL-scoped reads live in services/rulebooks.py rather than in
services/rule_versions.py because rulebooks already imports rule_versions for
the write path and the reverse would be a cycle. It is also the honest split:
rule_versions owns what a version IS, rulebooks owns who may read one.

Scoping is through the RULE, never the version's user_id, and both directions
of that mistake are now pinned by tests. That column is the ACTOR — scoping
by it would hand someone the snapshots they personally wrote on a rule that
has since moved out of their reach, and would hide from the rule's owner
every edit anyone else made. `get_rule_version` takes the rule id as well as
the version id so the ownership check and the fetch agree about which rule is
in play; the test for that uses a second rule the caller genuinely owns,
because a nonexistent id would pass on the ownership check alone and prove
nothing.

An unreadable rule returns None, not an empty list. The two mean different
things — "not your rule" versus "never reworded" — and the MCP tool keeps
them apart: None raises, empty says so in band.

THE DIFF QUESTION, ANSWERED — and the task's premise was half wrong. It says
"notes have DiffView.vue and a diff endpoint already". The component exists
and is reusable as-is: it takes `DiffLine[]` and nothing note-shaped, so step
4 can render a rule diff with it unchanged. The ENDPOINT does not exist —
diffs are computed client-side by `computeDiff` in useAssist.ts. So no diff
route is needed here, and none was written.

For the MCP door the answer is different again: an agent has no client to
compute a diff, but it also does not need one. Each entry holds the text the
edit REPLACED, so "what did this say before the most recent change?" is the
first entry, and the text that change produced is the rule as it stands. The
docstring says so, and a test pins that sentence — read the other way round,
every diff comes out backwards.

No restore, per the task. Putting an old wording back goes through
update_rule, which snapshots what it replaces, so the undo stays visible like
any other edit.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-29 23:46:15 -04:00

551 lines
23 KiB
Python

"""Tests for MCP rulebook tools — patches the service layer."""
from unittest.mock import AsyncMock, MagicMock, patch
import pytest
from tests.helpers import FakeMCP, fake_rule, fake_rulebook, fake_topic
pytestmark = pytest.mark.usefixtures("_bind_user")
@pytest.mark.asyncio
async def test_list_rulebooks_wraps_in_dict():
rows = [fake_rulebook(id=1, title="t"), fake_rulebook(id=2, title="t")]
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.list_rulebooks",
AsyncMock(return_value=rows),
):
from scribe.mcp.tools.rulebooks import list_rulebooks
out = await list_rulebooks()
assert len(out["rulebooks"]) == 2
@pytest.mark.asyncio
async def test_get_rulebook_includes_topics():
rb = fake_rulebook(id=1, title="t")
topics = [fake_topic(id=10, title="git"), fake_topic(id=11, title="git")]
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.get_rulebook",
AsyncMock(return_value=rb),
), patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.list_topics",
AsyncMock(return_value=topics),
):
from scribe.mcp.tools.rulebooks import get_rulebook
out = await get_rulebook(rulebook_id=1)
assert out["id"] == 1
assert len(out["topics"]) == 2
@pytest.mark.asyncio
async def test_get_rulebook_raises_when_not_found():
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.get_rulebook",
AsyncMock(return_value=None),
):
from scribe.mcp.tools.rulebooks import get_rulebook
with pytest.raises(ValueError, match="rulebook 999 not found"):
await get_rulebook(rulebook_id=999)
def _plain_detail():
"""Stub the rule_detail seam these tool tests are not about.
create/update/get_rule now return through services.rulebooks.rule_detail,
which reads the rule's areas and edges from the database. These are unit
tests with no database, and what they assert is that the TOOL forwards the
right arguments — so the seam is stubbed to the plain record, the same way
they already stub the create/update calls themselves.
"""
async def _detail(_uid, rule, _system_ids=None):
return rule.to_dict()
return patch("scribe.mcp.tools.rulebooks.rulebooks_svc.rule_detail", _detail)
@pytest.mark.asyncio
async def test_create_rule_passes_required_fields():
rule = fake_rule(id=100, title="r", statement="s", topic_id=10)
mock = AsyncMock(return_value=rule)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.create_rule", mock), _plain_detail():
from scribe.mcp.tools.rulebooks import create_rule
await create_rule(
topic_id=10, title="dev is home", statement="Work directly on dev",
)
kwargs = mock.call_args.kwargs
assert kwargs["user_id"] == 7
assert kwargs["topic_id"] == 10
assert kwargs["statement"] == "Work directly on dev"
@pytest.mark.asyncio
async def test_create_rule_blocked_by_duplicate_gate():
from scribe.services.dedup import DuplicateMatch
dup = DuplicateMatch(id=47, title="dev is home", similarity=1.0, reason="title")
create_mock = AsyncMock()
with patch("scribe.mcp.tools.rulebooks.dedup_svc.find_duplicate_rule",
AsyncMock(return_value=dup)), \
patch("scribe.mcp.tools.rulebooks.rulebooks_svc.create_rule", create_mock):
from scribe.mcp.tools.rulebooks import create_rule
out = await create_rule(topic_id=10, title="dev is home", statement="x")
assert out["duplicate"] is True
assert out["existing_id"] == 47
assert "update_rule" in out["message"]
create_mock.assert_not_called()
@pytest.mark.asyncio
async def test_create_rule_force_bypasses_duplicate_gate():
find_mock = AsyncMock()
with patch("scribe.mcp.tools.rulebooks.dedup_svc.find_duplicate_rule", find_mock), \
patch("scribe.mcp.tools.rulebooks.rulebooks_svc.create_rule",
AsyncMock(return_value=fake_rule(id=5, title="r", statement="s", topic_id=10))), \
_plain_detail():
from scribe.mcp.tools.rulebooks import create_rule
out = await create_rule(topic_id=10, title="dev is home", statement="x", force=True)
assert out["id"] == 5
find_mock.assert_not_called()
@pytest.mark.asyncio
async def test_update_rule_only_sends_non_default_fields():
rule = fake_rule(id=100, title="r", statement="s", topic_id=10)
mock = AsyncMock(return_value=rule)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.update_rule", mock), _plain_detail():
from scribe.mcp.tools.rulebooks import update_rule
await update_rule(rule_id=1, statement="new statement")
args, kwargs = mock.call_args
assert args == (1, 7)
# `clear` is always forwarded — an empty tuple is "clear nothing", which is
# a value, not an absent argument. Everything the caller left at its
# default stays out: that is the property this test pins.
assert kwargs == {"statement": "new statement", "clear": ()}
@pytest.mark.asyncio
async def test_update_rule_forwards_the_fields_named_for_clearing():
"""Naming a field is the only way to empty it through this door.
"" means "leave unchanged" here, so a caller has no value that means
"remove it" — which is what makes an explicit list necessary and what
stops a partial update from wiping the fields it did not mention.
"""
rule = fake_rule(id=100, title="r", statement="s", topic_id=10)
mock = AsyncMock(return_value=rule)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.update_rule", mock), _plain_detail():
from scribe.mcp.tools.rulebooks import update_rule
await update_rule(rule_id=1, clear_fields=["verify_with"])
_args, kwargs = mock.call_args
assert kwargs == {"clear": ["verify_with"]}
@pytest.mark.asyncio
async def test_update_rule_sends_the_check_fields_when_given():
rule = fake_rule(id=100, title="r", statement="s", topic_id=10)
mock = AsyncMock(return_value=rule)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.update_rule", mock), _plain_detail():
from scribe.mcp.tools.rulebooks import update_rule
await update_rule(
rule_id=1,
verify_with="cat CI-runner/renovate/config.js",
expires_when="approval is turned off",
)
_args, kwargs = mock.call_args
assert kwargs == {
"verify_with": "cat CI-runner/renovate/config.js",
"expires_when": "approval is turned off",
"clear": (),
}
@pytest.mark.asyncio
async def test_delete_rule_without_confirmed_returns_warning():
"""delete_rule with confirmed=False returns a preview, not an action."""
rule = fake_rule(id=100, title="r", statement="s", topic_id=10)
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.get_rule",
AsyncMock(return_value=rule),
), patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.delete_rule",
AsyncMock(),
) as mock_delete:
from scribe.mcp.tools.rulebooks import delete_rule
out = await delete_rule(rule_id=1, confirmed=False)
assert out.get("confirmed_required") is True
assert "confirmed=True" in out.get("warning", "")
assert not mock_delete.called # service NOT called
@pytest.mark.asyncio
async def test_delete_rule_with_confirmed_soft_deletes():
rule = fake_rule(id=100, title="r", statement="s", topic_id=10)
mock_delete = AsyncMock(return_value="batch-1")
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.get_rule",
AsyncMock(return_value=rule),
), patch(
"scribe.mcp.tools.rulebooks.trash_svc.delete",
mock_delete,
):
from scribe.mcp.tools.rulebooks import delete_rule
out = await delete_rule(rule_id=1, confirmed=True)
assert out["deleted"] == 1
assert out["deleted_batch_id"] == "batch-1"
assert mock_delete.called
@pytest.mark.asyncio
async def test_subscribe_project_to_rulebook_calls_service():
mock = AsyncMock()
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.subscribe_project", mock,
):
from scribe.mcp.tools.rulebooks import subscribe_project_to_rulebook
out = await subscribe_project_to_rulebook(project_id=3, rulebook_id=1)
assert out["subscribed"] is True
assert mock.called
@pytest.mark.asyncio
async def test_unsubscribe_project_from_rulebook_calls_service():
mock = AsyncMock()
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.unsubscribe_project", mock,
):
from scribe.mcp.tools.rulebooks import unsubscribe_project_from_rulebook
out = await unsubscribe_project_from_rulebook(project_id=3, rulebook_id=1)
assert out["subscribed"] is False
assert mock.called
def test_register_attaches_every_tool():
"""Every tool in the module reaches the server.
The count is the guard: a function added to the module but left out of
register()'s tuple is invisible to callers and raises nothing. The name
said "sixteen" for ten tools' worth of growth — the number lives in the
assertion, not the title, so it cannot drift again.
"""
from scribe.mcp.tools.rulebooks import register
mcp = FakeMCP()
register(mcp)
# 26 through milestone 307, +2 for the staleness sweep (milestone 312),
# +1 for a rule's edit history (milestone 323).
assert len(mcp.names) == 29
# spot-check a few names
assert "list_rulebooks" in mcp.names
assert "create_rule" in mcp.names
assert "subscribe_project_to_rulebook" in mcp.names
assert "list_always_on_rules" in mcp.names
# milestone 297: a project's opt-out of a whole always-on rulebook
assert "exclude_always_on_rulebook" in mcp.names
assert "include_always_on_rulebook" in mcp.names
assert "create_project_rule" in mcp.names
assert "suppress_rule_for_project" in mcp.names
# milestone 312: the sweep, and the stamp that answers it
assert "rules_due_for_verification" in mcp.names
assert "mark_rule_verified" in mcp.names
# milestone 323: what a rule used to say
assert "rule_history" in mcp.names
assert "unsuppress_rule_for_project" in mcp.names
assert "suppress_topic_for_project" in mcp.names
assert "unsuppress_topic_for_project" in mcp.names
@pytest.mark.asyncio
async def test_list_always_on_rules_returns_empty_when_no_always_on_rulebooks():
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.list_always_on_rules",
AsyncMock(return_value=[]),
):
from scribe.mcp.tools.rulebooks import list_always_on_rules
out = await list_always_on_rules()
assert out == {"rules": [], "total": 0}
@pytest.mark.asyncio
async def test_list_always_on_rules_projects_each_rule():
rules = [fake_rule(id=100, title="r", statement="s", topic_id=10), fake_rule(id=101, title="r", statement="s", topic_id=10)]
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.list_always_on_rules",
AsyncMock(return_value=rules),
):
from scribe.mcp.tools.rulebooks import list_always_on_rules
out = await list_always_on_rules()
assert out["total"] == 2
assert {r["id"] for r in out["rules"]} == {100, 101}
assert all("topic_id" in r for r in out["rules"])
@pytest.mark.asyncio
async def test_update_rulebook_forwards_always_on_when_set():
rb = fake_rulebook(id=1, title="t")
mock = AsyncMock(return_value=rb)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.update_rulebook", mock):
from scribe.mcp.tools.rulebooks import update_rulebook
await update_rulebook(rulebook_id=1, always_on=True)
kwargs = mock.call_args.kwargs
assert kwargs.get("always_on") is True
assert "title" not in kwargs
assert "description" not in kwargs
@pytest.mark.asyncio
async def test_update_rulebook_omits_always_on_when_none():
rb = fake_rulebook(id=1, title="t")
mock = AsyncMock(return_value=rb)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.update_rulebook", mock):
from scribe.mcp.tools.rulebooks import update_rulebook
await update_rulebook(rulebook_id=1, title="new title")
kwargs = mock.call_args.kwargs
assert "always_on" not in kwargs
assert kwargs["title"] == "new title"
@pytest.mark.asyncio
async def test_create_project_rule_passes_required_fields():
rule = fake_rule(id=100, title="r", statement="s", topic_id=10)
mock = AsyncMock(return_value=rule)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.create_project_rule", mock), _plain_detail():
from scribe.mcp.tools.rulebooks import create_project_rule
await create_project_rule(
project_id=42,
statement="Always run migrations through alembic, not raw SQL.",
why="audit trail",
)
kwargs = mock.call_args.kwargs
assert kwargs["user_id"] == 7
assert kwargs["project_id"] == 42
assert kwargs["statement"].startswith("Always run migrations")
assert kwargs["why"] == "audit trail"
@pytest.mark.asyncio
async def test_create_project_rule_derives_title_from_statement():
rule = fake_rule(id=100, title="r", statement="s", topic_id=10)
mock = AsyncMock(return_value=rule)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.create_project_rule", mock), _plain_detail():
from scribe.mcp.tools.rulebooks import create_project_rule
await create_project_rule(
project_id=42,
statement="Avoid auto-generated docstrings. Reviewers find them noise.",
)
kwargs = mock.call_args.kwargs
# Title should be derived from the first sentence, capped at 50 chars
assert kwargs["title"] == "Avoid auto-generated docstrings"
@pytest.mark.asyncio
async def test_create_project_rule_uses_explicit_title_when_given():
rule = fake_rule(id=100, title="r", statement="s", topic_id=10)
mock = AsyncMock(return_value=rule)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.create_project_rule", mock), _plain_detail():
from scribe.mcp.tools.rulebooks import create_project_rule
await create_project_rule(
project_id=42,
statement="anything",
title="no auto-docstrings",
)
kwargs = mock.call_args.kwargs
assert kwargs["title"] == "no auto-docstrings"
@pytest.mark.asyncio
async def test_suppress_rule_for_project_passes_through():
mock = AsyncMock(return_value=None)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.suppress_rule_for_project", mock):
from scribe.mcp.tools.rulebooks import suppress_rule_for_project
out = await suppress_rule_for_project(project_id=3, rule_id=17)
kwargs = mock.call_args.kwargs
assert kwargs == {"project_id": 3, "rule_id": 17, "user_id": 7}
assert out == {"project_id": 3, "rule_id": 17, "suppressed": True}
@pytest.mark.asyncio
async def test_unsuppress_rule_for_project_passes_through():
mock = AsyncMock(return_value=None)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.unsuppress_rule_for_project", mock):
from scribe.mcp.tools.rulebooks import unsuppress_rule_for_project
out = await unsuppress_rule_for_project(project_id=3, rule_id=17)
kwargs = mock.call_args.kwargs
assert kwargs == {"project_id": 3, "rule_id": 17, "user_id": 7}
assert out == {"project_id": 3, "rule_id": 17, "suppressed": False}
@pytest.mark.asyncio
async def test_suppress_topic_for_project_passes_through():
mock = AsyncMock(return_value=None)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.suppress_topic_for_project", mock):
from scribe.mcp.tools.rulebooks import suppress_topic_for_project
out = await suppress_topic_for_project(project_id=3, topic_id=22)
kwargs = mock.call_args.kwargs
assert kwargs == {"project_id": 3, "topic_id": 22, "user_id": 7}
assert out == {"project_id": 3, "topic_id": 22, "suppressed": True}
@pytest.mark.asyncio
async def test_unsuppress_topic_for_project_passes_through():
mock = AsyncMock(return_value=None)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.unsuppress_topic_for_project", mock):
from scribe.mcp.tools.rulebooks import unsuppress_topic_for_project
out = await unsuppress_topic_for_project(project_id=3, topic_id=22)
kwargs = mock.call_args.kwargs
assert kwargs == {"project_id": 3, "topic_id": 22, "user_id": 7}
assert out == {"project_id": 3, "topic_id": 22, "suppressed": False}
# ── Typed edges between rules (milestone 307) ───────────────────────────
@pytest.mark.asyncio
async def test_relate_rules_forwards_the_kind_and_the_why():
"""The edge exists so a shape stops being merged into one row. The `note`
travels with it for the same reason a rule carries `why`: whoever later
decides whether the edge still holds needs the reasoning."""
relation = MagicMock()
relation.to_dict.return_value = {"id": 9, "kind": "co_surfaces"}
mock = AsyncMock(return_value=relation)
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.add_rule_relation", mock):
from scribe.mcp.tools.rulebooks import relate_rules
out = await relate_rules(
from_rule_id=46, to_rule_id=144, kind="co_surfaces",
note="a stale channel tag and an unparseable version both read as "
"no update available",
)
assert out["id"] == 9
args = mock.call_args.args
assert args[0] == 7 and args[1] == 46 and args[2] == 144
assert args[3] == "co_surfaces"
assert "no update available" in args[4]
@pytest.mark.asyncio
async def test_relate_rules_raises_when_either_end_is_not_yours():
"""The service returns None when it cannot see both rules — a one-sided
edge would surface a rule the caller has no business reading."""
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.add_rule_relation",
AsyncMock(return_value=None)):
from scribe.mcp.tools.rulebooks import relate_rules
with pytest.raises(ValueError, match="not found"):
await relate_rules(from_rule_id=1, to_rule_id=2, kind="overrides")
@pytest.mark.asyncio
async def test_unrelate_rules_raises_when_the_edge_is_gone():
with patch("scribe.mcp.tools.rulebooks.rulebooks_svc.remove_rule_relation",
AsyncMock(return_value=False)):
from scribe.mcp.tools.rulebooks import unrelate_rules
with pytest.raises(ValueError, match="not found"):
await unrelate_rules(relation_id=99)
# ── rule_history (milestone 323 step 3) ────────────────────────────────
def _fake_version(**over):
"""A RuleVersion-shaped stand-in. A real model instance rather than a
MagicMock, because the tool calls `to_dict` and a mock would hand back
another mock instead of failing."""
from scribe.models.rule_version import RuleVersion
from datetime import datetime, timezone
defaults = {
"id": 5, "rule_id": 100, "user_id": 1,
"title": "The runner has no bash", "statement": "Use sh.",
"why": "the image ships no bash", "how_to_apply": None,
"when_to_apply": None, "tier": "always_on",
"verify_with": "read the workflow's shell setting",
"expires_when": None,
"created_at": datetime(2026, 8, 29, tzinfo=timezone.utc),
}
return RuleVersion(**{**defaults, **over})
@pytest.mark.asyncio
async def test_rule_history_lists_without_the_heavy_text():
"""The listing answers "when, and by whom". A rule's statement runs to
thousands of characters, so a history carrying every field would cost
more to read than the answer is worth."""
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.list_rule_versions",
AsyncMock(return_value=[_fake_version(), _fake_version(id=4)]),
):
from scribe.mcp.tools.rulebooks import rule_history
out = await rule_history(rule_id=100)
assert out["total"] == 2
assert out["versions"][0]["title"] == "The runner has no bash"
assert "statement" not in out["versions"][0]
assert "why" not in out["versions"][0]
@pytest.mark.asyncio
async def test_rule_history_opens_one_version_in_full():
"""Passing a version id switches from the index to the text — which is
the whole reason the listing can afford to omit it."""
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.get_rule_version",
AsyncMock(return_value=_fake_version()),
):
from scribe.mcp.tools.rulebooks import rule_history
out = await rule_history(rule_id=100, version_id=5)
assert out["statement"] == "Use sh."
assert out["verify_with"] == "read the workflow's shell setting"
@pytest.mark.asyncio
async def test_rule_history_says_an_empty_history_is_ordinary():
"""Most rules have never been reworded, and nothing was written before
milestone 323. Without this line an empty list reads as a lost history or
a broken tool."""
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.list_rule_versions",
AsyncMock(return_value=[]),
):
from scribe.mcp.tools.rulebooks import rule_history
out = await rule_history(rule_id=100)
assert out["total"] == 0
assert "never been reworded" in out["note"]
@pytest.mark.asyncio
async def test_rule_history_raises_when_the_rule_is_not_yours():
"""None from the service means "not readable", and the tool must not
turn that into an empty history — which would read as "this rule has no
past" rather than "this is not your rule"."""
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.list_rule_versions",
AsyncMock(return_value=None),
):
from scribe.mcp.tools.rulebooks import rule_history
with pytest.raises(ValueError, match="rule 100 not found"):
await rule_history(rule_id=100)
@pytest.mark.asyncio
async def test_rule_history_raises_for_a_version_on_another_rule():
with patch(
"scribe.mcp.tools.rulebooks.rulebooks_svc.get_rule_version",
AsyncMock(return_value=None),
):
from scribe.mcp.tools.rulebooks import rule_history
with pytest.raises(ValueError, match="version 5 not found"):
await rule_history(rule_id=100, version_id=5)
def test_rule_history_docstring_says_what_a_version_HOLDS():
"""The one thing a reader gets wrong unaided: an entry is the text the
edit REPLACED, not the text it introduced. Read the other way, every
diff comes out backwards — so the docstring has to say it, and this is
the guard against a later tidy-up dropping the line."""
from scribe.mcp.tools.rulebooks import rule_history
doc = rule_history.__doc__ or ""
assert "REPLACED" in doc
assert "no restore" in doc.lower(), (
"the docstring no longer explains that a rule version cannot be "
"restored. A caller who assumes a revert exists will look for one "
"and, not finding it, is likely to hand-copy the old text back with "
"no record of why."
)