Milestone 333 step 4 — the split #2223 made one surface down, now made for the
third corpus. The arm inherited WRITEPATH_DEFAULT_THRESHOLD = 0.68, a number
measured against code-vs-note-PROSE and never re-derived for code-vs-RULE-TEXT.
THE DEFAULT IS ARGUED STRUCTURALLY, NOT READ OFF A HISTOGRAM (rule 115). Two
facts hold on any install, including one with six rules and no telemetry:
- The eligible corpus is tiny — conditional rules only, a handful to a few
dozen against thousands of notes. A top-k over forty candidates always
returns something, so "the best match cleared the bar" stops meaning "a good
match exists". A bar calibrated for best-of-thousands is cleared by
best-of-forty as arithmetic, not relevance.
- Rules are short imperative technical English, far more homogeneous than note
prose. #2223 put the code-vs-prose floor at 0.55-0.63 and set 0.68 above it;
a more homogeneous corpus has a HIGHER floor, so 0.68 is not merely
inherited, it sits below where this corpus's noise lives.
0.72 errs deliberately toward silence on an asymmetry that is also structural:
this hint fires on EVERY write. A missed rule is recoverable — it is still in
Scribe and the agent can search it. A hint that cries wolf is not: it teaches
the reader to skip the whole block, and the true positives go with it. The
arm's own comment already said "noise on a hint that fires on every write is
how a hint gets ignored".
Pinned as an INEQUALITY, not a value: test_the_rule_bar_defaults_above_the_code_bar
asserts RULEHINT > WRITEPATH, so tuning the number stays free while inverting
the relationship — which would silently reinstate #3311 — does not.
RULEHINT_LIMIT = 1, and deliberately not a knob. With a corpus this small, k=2
means the second line is almost always the second-best noise wearing the same
confident framing as the first; halving k halves that regardless of the bar.
It stays a constant because it is a decision about how loud one hint may be,
not a per-install tuning question — and a knob nobody turns only adds a way to
misconfigure the surface.
Reachable from Settings, no restart (rule 25), with copy that says which way to
move it and points at retrieval_telemetry's rule pull-through — which step 3
made readable — to tell "arriving unread" from "never arrived".
Every config stand-in in the suite gained the key, not just the one that
noticed. The arm reads `rule_threshold` while BUILDING its search arguments, so
a missing key raises inside its fail-open except and turns the arm into a
silent no-op — indistinguishable from it running and finding nothing. That is
the same vacuous-pass shape that bit step 2, one layer down (rule 33).
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TcCs1CcQ1ormdnzSshKqvN
bvandeusenandClaude Opus 5
238510080e