- Nothing in the vendor's process group outlives the call: the group is
killed on every resolve, the clean 'close' path included (a helper the
vendor forked with redirected stdio ran on unsupervised before).
- A child that already exited when the deadline fires keeps its result; the
deadline only ends the drain instead of rewriting a completed exit as a
timeout.
- The decoded-leaf scan reports when its node/depth bound cut the walk short
and the hook refuses the hand-off as unscanned; object keys are scanned too.
- git for the trust-policy lookup runs without inherited GIT_* selectors
(GIT_DIR, GIT_WORK_TREE, GIT_CONFIG_*), so it inspects the session's
repository and no other; a host cancellation kills that git as well.
- An unmatched brace in a vendor banner no longer hides the answer after it.
- The stderr tail is scanned whole before it is cropped for the log, so a
credential's prefix cannot be cropped away from its secret half.
- The vendor override reads an empty GSTACK_MEMORABLE_BIN as unset, exactly
as bin/gstack-memorable does, so enable checks the binary the hook runs.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
- The bash shim runs bun as a job and forwards SIGTERM/SIGINT/SIGHUP (bash
holds a signal until a foreground child exits); the .ts kills the in-flight
vendor's process group on the way out (runExternal exposes the group kill
through onSpawn), so a hook the host terminates cannot leave the vendor
running with the prompt on its stdin.
- The tolerant stdout parser tries every complete top-level object (bounded)
and takes the first carrying a string additionalContext, so a banner with
braces or quotes, or a progress object, no longer costs the answer.
- git runs with LC_ALL=C and the not-a-repository check is anchored to the
start of its message: a localized git or a repository path containing the
phrase can no longer flip the lookup.
- The rate limiter remembers up to 32 live keys, so alternating failures cost
two lines, not one per prompt.
- Unicode format characters (bidi overrides, zero-width spaces) are stripped
from vendor text at egress; the zero-width joiner stays for emoji.
- A killed child (timeout, ENOBUFS) resolves on exit without the stdout drain,
and the post-kill grace is 100 ms, so the timeout outcome fits the reserve.
- The ledger size warning, which the host discards from an exit-0 hook's
stderr, is logged where status looks.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
- Trust-policy lookup fails closed on any git failure that is not 'no such
remote' or 'not a git repository' (a corrupt or unreadable .git/config and
dubious ownership exit 128 and used to read as 'no remote').
- pickAdditionalContext takes the first complete top-level JSON object, so a
vendor whose background helper appends a line to stdout (or prints a banner
first) does not lose its answer.
- The hook-errors.log rate limiter keys on a stable string (a vendor's
timestamped stderr no longer defeats it); the log is chmod 0600 on every
append because sibling hooks create the same file without a mode.
- Scan admission is sized by payload bytes (scan() is uninterruptible).
- The receipt payload class is a stable token; the prose moved to the docs.
- Header, constants and comments match the behaviour (silent skips vs logged
refusals; HIGH/MEDIUM withholding; STAGE_CAP_MS scope; runExternal in the
spawn-bin header; the ledger lock budget doc).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
- Vendor failures are logged even with empty stderr (a silently hanging
vendor taxed every prompt invisibly); the stderr tail is withheld when the
redaction engine finds a credential or PII shape in it; hook-errors.log is
created 0600.
- Trust-policy veto fails closed when git cannot run or answer in time (it
read as 'no remote' before); the policy script spawn is bounded by the
hook's clock; a payload cwd that is not a directory falls back.
- Each secret scan is admitted by the deadline clock (the engine's cost grows
with match density); stdin is decoded once.
- The pre-spawn gate re-check logs a config failure instead of swallowing it;
an incomplete stdin read is named as such, not as 'not JSON'.
- Carriage returns are stripped with the other controls.
- The vendor env allowlist adds the standard proxy, TLS and XDG variables so
a vendor behind a corporate proxy or private CA still reaches its service.
- A stdin EPIPE on a delivered answer is recorded in the outcome, not treated
as a spawn error.
- Stage caps and the truncation marker are named constants; a test-only
GSTACK_MEMORABLE_TEST_BUDGET_MS can shorten (never widen) the budget.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The PR's hook exec'd the vendor binary with the full environment and
passed its stdout to Claude verbatim. It is now the house pattern: a
fail-open bash shim over a .ts twin that (1) gates on the memorable_recall
consent key, (2) skips repos whose trust policy is deny or read-only,
(3) scans the prompt (raw bytes and decoded string leaves) and refuses to
hand over a HIGH-tier credential shape, (4) writes a fail-closed egress
receipt naming the local executable it ran, (5) spawns the vendor in its
own process group with an allowlisted environment and group-kills it on
timeout, (6) accepts only a string additionalContext back, caps it at
8 KiB on a UTF-8 boundary and wraps it in the trust envelope, and (7)
records an `output-written` outcome after the stdout write completes.
One deadline clock (4.5 s) undercuts Claude Code's 5 s kill and bounds
both ledger writes through the new lockBudgetMs option on
writeReceipt/writeOutcome (default unchanged).
spawn-bin gains runExternal for external executables (detached group,
stderr drained, stdin EPIPE handled, stdout capped, win32 refused).
The wiring test pins the sink fail-closed and sweeps hosts/.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
