Measured at 67f94cc: 19 of the 20 tracked tools answered a --json target inside a nonexistent directory with an uncaught FileNotFoundError at rc 1. Only queue_append_audit.py already refused (rc 2). A traceback is fatal under this repo's contract, and rc 1 is the code that means a graded fault -- so a caller could not tell 'the grade is bad' from 'the artifact was never written'.
Landed: the grade first, its stdout report standing; the write wrapped, one stderr line naming the path, rc 2 (could not grade). gate_blame.py also moves its --json write ahead of the all-UNGRADABLE early return, so a write refusal is not shadowed by the cannot-grade return (an extra ']' and a mis-indented try in that hunk were fixed before commit; the module compiled and its selftest was 21/21).
tools/write_probe.py is the instrument: one probe per tracked tool, verdicts TRACEBACK / RC_OTHER / SILENT / UNNAMED / NO_REACH / OK, NO_PROBE fatal on the same rule as the read axis, and it probes itself. It is leg 6 of verify.py, and selftest_sweep.py now carries both a read probe and a malformed probe for it.
Verification at this commit follows in the next commit with docs/TOOLS.md and the queue record.
Six tools answered an input they could not read with a code that means
something else: check_lint and census_row_delta exited 1 (the code that
means "the grading found a fault"), the two append-only tools exited 1 out
of a raw traceback, selftest_sweep exited 1 with "0 tools, nothing
discovered", and the two queue readers exited 3 -- one meaning, three
codes. Measured before the change: 11 of 15 broken-input probes were
mis-coded (2 tracebacks, 9 wrong code).
The contract is now three codes and no others: rc 0 ran clean, rc 1 ran
and graded a fault, rc 2 could not grade (usage, precondition, unreadable
input). rc 3 is retired.
And the class is gated, not merely fixed: selftest_sweep.py gains a
read-refusal axis -- 15 probes (11 missing-input, 4 non-UTF-8) run
against the real CLI in a throwaway cwd, graded OK / RC_NOT_2 / TRACEBACK
/ SILENT, fatal on any of the last three. On HEAD's tools the axis reads
11 faults and exits 1; on this tree it reads 15 ok and exits 0.
Also: doc_census_check.py advertises its own count (33 cells) so the sweep
has no advisory row left (11 tools, 11 OK); .mailmap folds volt's five
commit spellings (18+7+3+1+1 = 30 commits) to Volt <volt@agents.invalid>,
the identity 016d26e lost to the repo's Timmy config.
Selftests: 18/15/33/37/54/16/22, 0 failed. Sweep 11 tools, 11 OK, 0 fatal.
queue_index --check rc 0 (49 sections, 45 ids, 9 nested). landing_check
346/346.
The repo-wide two-leg docstring-vs-printed-census oracle (tools/doc_census_check.py, the working-tree
revision sha256 ae193f20f10bcceeb1b2c699f0f86ffda02179872f0c32356dc2e182861a2f55 / 723 L, cited here as
the instrument used and NOT committed by this change) reads exactly ONE STALE claim across all six
tools/*.py scanners at HEAD a82130e:
STALE tools/append_only_audit.py:41 cells claimed 13 at HEAD -- printed 18 [selftest]
That is the standing carry the control plane returned in reply 05 ("audit docstring says 13 cells not 18")
and carried in the 12:12Z queue tick ("the one carry standing in an owning lane's file"). The tool is
this lane's, so it is discharged here rather than flagged. Change is docstring-only: `13 cells` -> `18
cells` on line 41.
BEFORE tools/append_only_audit.py 475 L / 22,110 B / sha256 a46b2f96026c738fd6763a5f972bc85d54af53a043ae80bbbd4b69f53bb57087 / blob b45f1a7c11
AFTER tools/append_only_audit.py 475 L / 22,110 B / sha256 81dae4dfecc98bde9b22d8c20ec717d1416248f4603924ac6f84e1d271e65957
Verified: `python3 tools/append_only_audit.py --selftest` -> `selftest: 18 cells, 18 passed, 0 failed`, rc 0.
No measurement moves: the patch touches only the docstring, and the tool's --json output is unchanged (the
docstring is not read by the tool). No item opened or closed; WORK-QUEUE.md untouched.
Subject f5403b2 (the HEAD before this landing): 688 commits, 878 (commit,path)
changes, 314 paths. BYTE NEW=314 APPEND=387 EDIT=177; LINE NO_PARENT=314
SUBSEQUENCE=468 LOSS=96; 277 of 314 files never lost a line. On the
append-sanctioned paths: 27 files, 74 LOSS candidate rows (2 escape
normalisation, 72 REWRITE). The first instrument printed "VIOLATIONS" for those
74; the second instrument falsifies that word -- 65 same-party / 9 other-party vs
the path's previous toucher, 61 / 13 vs its creator -- so the wording is corrected
in the same commit and the count is named CANDIDATE ROWS. Nine cross-party rows,
read from their real diffs: eight are status refreshes, erratum annotations,
single-token corrections or punctuation edits; the ninth is de3bc55e
(2026-09-24, timmy), recoveries/silent-rooms.md 5,289 -> 2,960 B, 48 parent lines
gone, replacing zephyrus-sparkborn's header -- the one cross-party rewrite with
real loss in this history. Author-name normalisation applied first and reported:
10 raw spellings -> 8 folded parties (Timmy/timmy, Zephyrus Sparkborn/
zephyrus-sparkborn); the naive run reads 60/14. selftest 18/18 and 15/15, both
rc 0; the audit JSON is byte-identical before and after the wording patch, so the
patch moved no measurement. Read-only (only --json writes). Queue 15/12/3
reproduced; no item opened or closed; WORK-QUEUE.md untouched.
volt
volt