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bvandeusenandClaude Opus 5 390846a3d5 fix(write-path): disclose cross-language prior art instead of hiding it
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Closes #2244. Retrieval matches on concept, and concepts are language-agnostic:
asking about a TypeScript union-find scores 0.72-0.73 against a PYTHON snippet,
comfortably over the 0.68 bar. That is useful — a different-language solution
gives you the shape even when the code isn't reusable — but the menu line said
nothing about it, so the reader either dismissed a good structural reference or
pasted Python into a .ts file.

Worth noting this predates the concept-query change: raw TS code already matched
the Python snippet at 0.73, because the embedder reads identifiers and structure
semantically rather than syntactically. The fail state has been shipping quietly;
#2242 only made it an intended use rather than an accident.

- knowledge._note_to_item projects `language` from the data mirror, same shape as
  the existing verification projection — a plain column read, no body parsing.
- The semantic arm carries language through on the item it builds; it is the arm
  where these arise, since a snippet recorded AT the path you're editing is
  almost never in another language.
- _prior_art_line folds it into the marker: [similar 0.72 · python]. Together
  with the score rather than after the title, because the two jointly are the
  judgement being offered.
- One explanatory line is added to the menu, and only when something on it is
  actually tagged.

Two deliberate calls:

LABEL, DON'T FILTER. A stricter threshold for foreign-language hits would
suppress exactly the shape-borrowing this exists for. They were never the
problem; their being undisclosed was.

ONLY CLAIM A MISMATCH YOU CAN ESTABLISH. _foreign_language returns "" when either
side is unknown — unrecognised extension, or a snippet with no recorded language.
A wrong "· python" is worse than no tag. Same-language hits stay unlabelled, so
the common case keeps a clean line and the preamble stays off the menu entirely.
Operator-typed language names fold through an alias table first (py/python3 →
python, tsx → typescript, c++ → cpp); unrecognised names pass through lowercased,
which still makes an unknown-but-equal pair compare equal.

Trap found while building: _note() in the tests is a MagicMock, so `note.data`
auto-created a truthy mock that would have rendered its repr into a menu line.
Both test helpers now set data = None explicitly.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UaYUaouG9jjhATyuxCKrQs
2026-07-30 10:31:56 -04:00
bvandeusenandClaude Opus 5 2b85443dd1 feat(snippets): usage signal — was a surfaced record ever actually pulled?
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retrieval_logs answers "what did the ranker return, at what scores" — the
right substrate for tuning a threshold. It cannot answer the question the
snippet corpus actually needs: did anyone open this? A snippet nobody
opens is not neutral. It takes a slot in every future auto-inject menu and
crowds out something useful.

Adds note_usage_events (migration 0071): one row per note per event,
either 'surfaced' (we put its title in front of an agent) or 'pulled'
(someone opened it in full), tagged with which surface produced it.

Closes the gap #2082 recorded against this work. The write-path PLACE arm
carries no score, so it has no home in retrieval_logs — folding it in
would corrupt the score distribution that table exists to capture. The
result was that the arm firing on the STRONGEST claim ("there is already a
canonical helper in this exact file") was the one arm nobody could
measure. Both arms now emit usage events under distinct sources, so their
pull-through rates are finally comparable.

Deliberate departures from the task as written:

- Not in-session correlation. The original framing was "correlate
  result_ids against a later get_note in the same session." There is no
  session identity server-side — the MCP endpoint is stateless and the
  hooks send no session id — and adding one would mean threading an
  opaque client-supplied token through every read path. Two independent
  counters answer the question without it: surfaced 40×, pulled 0 is dead
  weight regardless of how those events distribute across sessions.

- Pulls record at the ENTRY POINTS (MCP tools, REST detail route), not in
  snippets_svc.get_snippet, which update and merge also reach. Counting
  those would inflate precisely the number meant to say "someone chose to
  look at this."

- get_note records for every note kind, not just snippets. The auto-inject
  menu surfaces tasks and processes too; scoping this to snippets would
  pin those at zero pulls forever and make them read as dead weight next
  to snippets that merely had a counter.

Surfaced in the Snippets list as an "N/M used" badge, warning-toned once a
record has been offered 3+ times and never opened, with the tooltip saying
what to do about it (usually: its "when to reach for it" doesn't say
when). No badge at all below one surfacing — "0/0" reads as a verdict when
it's an absence of evidence. Also returned from MCP list_snippets so the
agent can see dead weight without opening the UI.

Telemetry keeps the retrieval_telemetry contract throughout: writes are
fire-and-forget, reads degrade to zeroes, and no path can raise into the
surface it observes.

Refs #2085

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UaYUaouG9jjhATyuxCKrQs
2026-07-28 18:09:17 -04:00