plugin/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "scribe",
   "description": "Scribe system-of-record for Claude Code: MCP tools over your notes/tasks/projects/rules, a session-start push channel that surfaces your always-on rules + active-project context, process-skills (writing-plans, systematic-debugging, verification, brainstorming, reusing-code), and your saved Scribe Processes auto-surfaced as skills (/scribe:sync). Replaces superpowers + file-memory with one app-backed plugin.",
-  "version": "2026.09.04.0140",
+  "version": "2026.09.09.0408",
   "author": {
     "name": "Bryan Van Deusen"
   },

plugin/hooks/scribe_session_context.sh

@@ -55,6 +55,53 @@ here=$(CDPATH= cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd) || exit 0
 event=$(cat 2>/dev/null || true)
 source=$(printf '%s' "$event" | jq -r '.source // empty' 2>/dev/null) || source=""
 
+# --- The rule ledger outlives the context it describes (#3749) ---
+#
+# scribe_prior_art.sh and scribe_tool_rules.sh record every rule id they have
+# named in <state>/<sid>.rules.ids and hand it back as exclude_rule_ids, so a
+# rule is named once per session and then goes quiet. That is right while the
+# session still HOLDS what it was told, and wrong the moment it does not.
+#
+# A compaction summarizes the earlier injections away and does not touch the
+# filesystem, so the rule ends up absent from context AND still excluded —
+# unreachable for the rest of the session. The banner below tells the model to
+# re-pull its ALWAYS-ON rules, but a rule an arm surfaced is conditional and is
+# not in that set, so it has no other way back. The rules most likely to be in
+# this state are the ones that fire most often, which is to say the ones that
+# apply most.
+#
+# The session id survives a compaction — the etag marker further down is
+# rewritten on `compact` and keyed by session_id, which is only meaningful if
+# the id is stable — so the stale ledger is genuinely found again, not orphaned.
+#
+# CLEARED ON THE SOURCES THAT DESTROY CONTEXT, AND ONLY THOSE:
+#
+#   compact  CLEAR — summarized away; the file survived.
+#   clear    CLEAR — context wiped.
+#   startup  nothing to do: a new session id means a new, empty file.
+#   resume   KEEP. The context was genuinely restored, so the ledger still
+#            describes what the session holds. Clearing here would re-surface
+#            every rule after a restore that lost nothing — the mirror error.
+#   fork     KEEP, and the answer is the same whichever way forks are keyed: a
+#            fork carries the conversation, so if it inherits the id the ledger
+#            is accurate, and if it gets a new one the file is empty anyway.
+#
+# ONLY the rules ledger. The same directory holds .ids / .sync.ids /
+# .derive.ids for the note arms. Whether a surfaced NOTE should return after a
+# compaction is a different question with a different answer, and leaving those
+# alone is a decision rather than an oversight.
+case "$source" in
+  compact|clear)
+    sid=$(printf '%s' "$event" | jq -r '.session_id // empty' 2>/dev/null) || sid=""
+    if [ -n "$sid" ]; then
+      safe_sid=$(printf '%s' "$sid" | tr -c 'A-Za-z0-9._-' '_')
+      # Best-effort, like every other filesystem touch in these hooks: a ledger
+      # that cannot be removed costs a repeated exclusion, never a session.
+      rm -f "${TMPDIR:-/tmp}/scribe-priorart/${safe_sid}.rules.ids" 2>/dev/null || true
+    fi
+    ;;
+esac
+
 out=""
 # Append $1 to $out, separated by a horizontal rule when $out already has content.
 append() { if [ -n "$out" ]; then out="${out}"$'\n\n---\n\n'"$1"; else out="$1"; fi; }

src/scribe/mcp/tools/search.py

@@ -169,10 +169,12 @@ async def retrieval_telemetry(days: int = 30) -> dict:
     `avg_result_count` and `p90_duration_ms`.
 
     THE NUMBER TO READ FIRST IS `near_misses.p90`, AGAINST THE THRESHOLD IN
-    FORCE FOR THAT SURFACE. It is measured only on the calls that returned
-    NOTHING, on the best score the ranker reached before the bar rejected it —
-    so it is the one figure here that says something the bar cannot make true
-    by construction. A bar at 0.72 turning away a stream of 0.71s is set too
+    FORCE FOR THAT SURFACE. It is measured on the calls the BAR turned away —
+    zero-result calls, minus the ones whose zero was a repeat the reader had
+    already been shown — using the best score the ranker reached before the bar
+    rejected it. So it is the one figure here that says something the bar
+    cannot make true by construction, and `max` is always below the threshold:
+    an above-bar candidate nobody excluded would have been returned. A bar at 0.72 turning away a stream of 0.71s is set too
     high by a hair and the surface is losing hits it should have had. The same
     bar turning away 0.30s is working, and the corpus simply had nothing. Both
     render as a zero-result call, and nothing else in this readout tells them

src/scribe/services/retrieval_telemetry.py

@@ -360,15 +360,45 @@ async def retrieval_summary(user_id: int | None, *, days: int = 30) -> dict:
     }
 
     zero = case((RetrievalLog.result_count == 0, 1), else_=0)
-    # THE NEAR-MISS POPULATION: calls that returned nothing AND recorded what
-    # the bar turned away. Both conditions matter. Restricting to zero-result
-    # calls is what makes the number say something the bar cannot fix by
-    # construction — on a call that returned something, `best_available_score`
-    # equals `top_score` and adds nothing. Requiring the column to be non-null
-    # keeps rows written before #3670 out of the sample rather than letting
-    # them read as scoreless declines.
-    declined = (RetrievalLog.result_count == 0) & (
-        RetrievalLog.best_available_score.isnot(None)
+    # THE NEAR-MISS POPULATION: calls that returned nothing BECAUSE THE BAR
+    # TURNED SOMETHING AWAY, and recorded what it was. Three conditions, and
+    # the third was missing for one deploy (#3739).
+    #
+    # Zero-result only: on a call that returned something,
+    # `best_available_score` equals `top_score` and adds nothing.
+    #
+    # Non-null only: rows written before #3670 genuinely do not know, and must
+    # not read as scoreless declines.
+    #
+    # AND NOT A REPEAT. A zero-result call is two unrelated events — the ranker
+    # found nothing above the bar, or it found only what this session had
+    # already been shown — and just the first says anything about the bar. That
+    # is the whole of #3497, and #3670 reintroduced the conflation one level up:
+    # the rule arms filter exclusions in PYTHON, after the search, so a rule
+    # that cleared the bar and was dropped as a repeat still reported a high
+    # `best_available_score` on a zero-result row. Live proof, first read after
+    # deploy: pre_tool_rule's near-miss max was 0.7457 while the lowest score it
+    # ever RETURNED was 0.7204 — a "rejection" that outscored acceptances.
+    #
+    # The NULL arm is principled, not permissive: `suppressed_count IS NULL`
+    # means the caller passed its exclusions INTO the search, which is exactly
+    # the case where the reported score is already post-exclusion and cannot be
+    # contaminated. Note arms stay measured; rule arms get cleaned.
+    #
+    # Deliberately conservative: a call carrying both a repeat and a lower
+    # genuine miss is dropped whole, losing that point. It undercounts; it
+    # cannot corrupt — the right way round for a number read against a bar.
+    #
+    # This also makes `near_misses.max < threshold` true BY CONSTRUCTION. An
+    # above-bar candidate that was not excluded would have been returned, so
+    # its call is not in this population at all.
+    declined = (
+        (RetrievalLog.result_count == 0)
+        & (RetrievalLog.best_available_score.isnot(None))
+        & (
+            RetrievalLog.suppressed_count.is_(None)
+            | (RetrievalLog.suppressed_count == 0)
+        )
     )
     miss = case((declined, 1), else_=0)
     # `best_available_score` only for those rows; NULL elsewhere, and

tests/test_services_retrieval_telemetry.py

@@ -994,6 +994,17 @@ async def test_the_near_miss_distribution_is_a_query_postgres_accepts(_dispose_e
         user_id=UID, source="pre_tool_rule", query="ls", threshold=0.72,
         limit=1, project_id=None, is_task=None, results=[], duration_ms=4.0,
     ))
+    # THE CASE WHOSE ABSENCE LET THIS GUARD PASS OVER BROKEN CODE (#3739).
+    # A zero-result call whose zero was a REPEAT, not a rejection: the ranker
+    # cleared the bar at 0.9 and the session had already been shown that rule,
+    # so the arm dropped it in Python after the search. Without the suppression
+    # arm of the predicate this row lands in the near-miss population and drags
+    # `max` to 0.9 — above the very threshold the field is read against.
+    await _insert_retrieval_log(_build_payload(
+        user_id=UID, source="pre_tool_rule", query="git commit", threshold=0.72,
+        limit=1, project_id=None, is_task=None, results=[], duration_ms=4.0,
+        best_available=0.9, suppressed=1,
+    ))
 
     try:
         out = await retrieval_summary(UID, days=30)
@@ -1002,22 +1013,28 @@ async def test_the_near_miss_distribution_is_a_query_postgres_accepts(_dispose_e
             "zeros everywhere, which is #2663 exactly"
         )
         src = out["sources"]["pre_tool_rule"]
-        assert src["calls"] == 5
-        assert src["zero_result_calls"] == 4
+        assert src["calls"] == 6
+        assert src["zero_result_calls"] == 5
 
         nm = src["near_misses"]
         assert nm is not None, "the near-miss block did not survive the query"
         assert nm["measured_calls"] == 3, (
-            "the population is declines that RECORDED a score: three measured, "
-            "one unmeasured (excluded, not counted as a scoreless decline), and "
-            "one call that showed something (excluded — its best-available is "
-            "just its top score and says nothing about the bar)"
+            "the population is declines the BAR caused, that recorded a score. "
+            "Three qualify. Excluded: the unmeasured row (predates the column, "
+            "not a scoreless decline), the call that showed something (its "
+            "best-available is just its top score), and the REPEAT — a zero "
+            "the reader caused, not the bar (#3739)"
         )
         assert nm["max"] == pytest.approx(0.7189, abs=1e-4), (
             "the closest thing the bar turned away — 0.7189 against a 0.72 "
             "threshold, which is the reading the whole field exists to give"
         )
-        assert nm["max"] < 0.72, "a near miss that cleared the bar is not a miss"
+        assert nm["max"] < 0.72, (
+            "a rejection that outscores the bar is not a rejection. This is "
+            "structural once the suppression arm is in the predicate: an "
+            "above-bar candidate that was not excluded would have been "
+            "RETURNED, so its call cannot be in this population (#3739)"
+        )
         assert 0.70 <= nm["p50"] <= 0.7189
     finally:
         async with async_session() as s:

tests/test_session_context_ledger.py

@@ -0,0 +1,158 @@
+"""The SessionStart hook clears the rule ledger exactly when context dies (#3749).
+
+WHY THIS EXISTS
+
+The prior-art and tool-rule hooks record every rule id they have named in
+`<state>/<sid>.rules.ids` and hand it back as `exclude_rule_ids`, so a rule is
+surfaced once per session and then goes quiet. That is correct while the
+session still holds what it was told.
+
+A compaction breaks that assumption in the worst available way: it summarizes
+the earlier injections out of context and does not touch the filesystem. The
+rule ends up absent from context AND still excluded — unreachable for the rest
+of the session. The compaction banner tells the model to re-pull its
+*always-on* rules, but a rule an arm surfaced is conditional and is not in that
+set, so it has no other way back. The rules most likely to be in that state are
+the ones that fire most often.
+
+WHAT THIS PINS
+
+Not "the ledger is cleared" — that would pass against a hook which deletes it
+on every source, and deleting on `resume` is its own defect: the context was
+genuinely restored there, so re-surfacing every rule is the mirror error.
+
+What is pinned is the DISCRIMINATION. The whole source table is asserted in one
+statement, so a blanket delete (all False) and a no-op (all True) both fail,
+and neither can be made to pass by editing one case.
+
+Runs the real shell against a temp TMPDIR, like the after-write hook's tests.
+Deliberately with no SCRIBE_URL/SCRIBE_TOKEN in the environment: clearing the
+ledger is local, keyless and networkless, and must still happen on an instance
+that is unreachable or unconfigured.
+"""
+from __future__ import annotations
+
+import json
+import os
+import shutil
+import subprocess
+from pathlib import Path
+
+import pytest
+
+PLUGIN = Path(__file__).resolve().parents[1] / "plugin"
+HOOK = PLUGIN / "hooks" / "scribe_session_context.sh"
+
+
+def _env(tmp_path):
+    """Near-namesake of test_after_write_hook's `_env`, and deliberately not it:
+    that one needs git and curl and SUPPLIES credentials, because the behaviour
+    it tests is a network round-trip. This one must prove the opposite — that
+    the clear happens with no credentials and no network at all — so sharing a
+    helper would mean testing this case in an environment that cannot show it.
+    """
+    for tool in ("jq", "bash"):
+        if shutil.which(tool) is None:
+            pytest.skip(f"hook runtime tool {tool!r} not installed")
+    # No SCRIBE_URL / SCRIBE_TOKEN on purpose — see the module docstring.
+    return {"PATH": os.environ["PATH"], "TMPDIR": str(tmp_path),
+            "HOME": str(tmp_path)}
+
+
+def _ledger(tmp_path, sid: str, name: str = "rules.ids") -> Path:
+    d = tmp_path / "scribe-priorart"
+    d.mkdir(exist_ok=True)
+    f = d / f"{sid}.{name}"
+    f.write_text("156\n168\n")
+    return f
+
+
+def _fire(source: str, sid: str, env) -> None:
+    subprocess.run(
+        ["bash", str(HOOK)],
+        input=json.dumps({"source": source, "session_id": sid}),
+        capture_output=True, text=True, env=env, timeout=30,
+    )
+
+
+def test_the_rules_ledger_survives_exactly_when_the_context_does(tmp_path):
+    """The whole source table, in one assertion, so it cannot be half-satisfied.
+
+    `startup` is listed even though it is a no-op against a session id that has
+    never been seen: it is asserted here so that a future change which starts
+    clearing indiscriminately fails on a case somebody would otherwise call
+    harmless.
+    """
+    env = _env(tmp_path)
+    survived = {}
+    for source in ("compact", "clear", "resume", "startup"):
+        sid = f"sess-{source}"
+        ledger = _ledger(tmp_path, sid)
+        _fire(source, sid, env)
+        survived[source] = ledger.exists()
+
+    assert survived == {
+        "compact": False,
+        "clear": False,
+        "resume": True,
+        "startup": True,
+    }, (
+        f"got {survived}. A rule surfaced before a compaction is summarized "
+        f"out of context while its id stays on the exclusion ledger, so it "
+        f"becomes unreachable for the rest of the session — that is what the "
+        f"compact/clear cases prevent. The resume case is the other half: the "
+        f"context came back intact there, and re-surfacing every rule after a "
+        f"restore that lost nothing is the same defect from the other side. "
+        f"All-False means something is deleting unconditionally; all-True "
+        f"means the clear never runs."
+    )
+
+
+def test_only_the_rule_ledger_is_cleared_and_the_note_ledgers_are_left(tmp_path):
+    """Scope, asserted rather than described.
+
+    The same directory holds `.ids`, `.sync.ids` and `.derive.ids` for the note
+    arms. Whether a surfaced NOTE should come back after a compaction is a
+    different question with a different answer, and it is not being answered.
+    A `rm` glob over `<sid>.*` would pass every assertion in the test above
+    while silently deciding it.
+    """
+    env = _env(tmp_path)
+    sid = "sess-scope"
+    rules = _ledger(tmp_path, sid, "rules.ids")
+    notes = _ledger(tmp_path, sid, "ids")
+    sync = _ledger(tmp_path, sid, "sync.ids")
+    derive = _ledger(tmp_path, sid, "derive.ids")
+
+    _fire("compact", sid, env)
+
+    assert not rules.exists(), "the rule ledger should have been cleared"
+    assert notes.exists() and sync.exists() and derive.exists(), (
+        "a note ledger was cleared too. The note arms were deliberately left "
+        "out of #3749 — clearing them is a decision about a different surface, "
+        "and a glob that takes them along makes it by accident."
+    )
+
+
+def test_a_compact_without_a_session_id_is_survivable(tmp_path):
+    """Defensive, because this hook's contract is fail-open.
+
+    An event with no `session_id` names no ledger. The hook must not error, and
+    must not fall back to a wildcard — clearing every session's ledger on the
+    machine because this one event was malformed is the worst available
+    reading of "best effort".
+    """
+    env = _env(tmp_path)
+    other = _ledger(tmp_path, "someone-elses-session")
+
+    proc = subprocess.run(
+        ["bash", str(HOOK)],
+        input=json.dumps({"source": "compact"}),
+        capture_output=True, text=True, env=env, timeout=30,
+    )
+
+    assert proc.returncode == 0, proc.stderr
+    assert other.exists(), (
+        "an event with no session id cleared a ledger belonging to a different "
+        "session"
+    )