feat(engine)!: counting is not delivering, and an empty inbox is not all clear
Reading IS delivery in this engine: coord-inbox.sh prints a broadcast and then records it as seen. That made "what is pending elsewhere" unanswerable -- asking the read path per repo would have consumed every repo's broadcast backlog as a side effect, once, silently, and unrecoverably, since the seen set is delivery history that retraction deliberately leaves alone. coord-count.sh answers it by counting files and writing nothing: no seen set, no .origin. It keys on MAILBOXES rather than repos -- it enumerates $COORD/* and never scans a filesystem for checkouts -- so a repo without a mailbox is not missing from the count, it is absent from the domain. Drained mailboxes are omitted rather than reported as zero, because the question is "who is owed a reply" and a list of zeroes answers a different one at every reader's expense. The read path now closes with one aggregate line built from it. The case that motivated this is the session whose own inbox is empty: it saw silence and concluded "all clear" while mail sat unanswered everywhere else. BREAKING (injection contract): the read path is no longer silent whenever THIS repo has nothing pending. It is a silent no-op only when the whole mailbox is empty. Coupling the line to having your own mail would have hidden it from its only real audience. Three selftest assertions that used "no output at all" as a proxy for "nothing was delivered" now assert the absence of the content itself, which is what they always meant. The line is an AGGREGATE of two integers, never a roster. A list of names would reproduce other repos' situation inside this repo's injection -- the state boundary the mailbox exists to respect -- and mailbox names are cross-repo input. Two integers cannot carry anything that escapes the framing. Its disclaimer is engine behavior, not politeness (Rule 7): the line lands directly beneath "handle this inbox FIRST", and without it the numbers read as an extension of that obligation and a session starts answering other repos' mail. Pinned in selftest section 26 exactly as section 20 pins the priority text. The hook's header drops "(unread messages)" for the same reason -- it would now announce mail that does not exist. Selftest 116 -> 136. Every new negative check is anchored to a positive assertion in the same output, because a missing script makes "X is absent" true by vacuity and would have gone green proving nothing. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01U6EixQo6hpoRCVtiAXdnFs
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28e7cb42cd
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10 changed files with 303 additions and 20 deletions
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@ -9,6 +9,7 @@ DIR="$(cd "$(dirname "$0")" && pwd)"
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SEND="$DIR/coord-send.sh"
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INBOX="$DIR/coord-inbox.sh"
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DONE="$DIR/coord-done.sh"
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COUNT="$DIR/coord-count.sh"
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CLAUDE_COORD_DIR="$(mktemp -d)"
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export CLAUDE_COORD_DIR
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@ -52,7 +53,10 @@ grep -q "^subject: Re: hello$" "$rf" 2>/dev/null; check "reply subject defaults
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[ -z "$(ls "$CLAUDE_COORD_DIR"/fake-repo/inbox/*.md 2>/dev/null)" ]; check "replied-to original drained from inbox" $?
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[ -n "$(ls "$CLAUDE_COORD_DIR"/fake-repo/archive/*.md 2>/dev/null)" ]; check "replied-to original moved to archive" $?
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out_after="$("$INBOX" --repo fake-repo)"
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[ -z "$out_after" ]; check "handled message no longer injected" $?
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# Asserts the CONTENT is gone, not that the output is empty. Since 0.8.0 a read
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# also emits the cross-repo line (section 26), so "no output at all" would test
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# the aggregate's silence rather than this message's absence.
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[ "$(printf '%s' "$out_after" | grep -c 'line one')" -eq 0 ]; check "handled message no longer injected" $?
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# 4. coord-done archives a pending message directly.
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"$SEND" --to fake-repo --from other --subject "second" --message "msg two" >/dev/null
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@ -63,7 +67,7 @@ b2="$(basename "$(ls "$CLAUDE_COORD_DIR"/fake-repo/inbox/*.md 2>/dev/null | head
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# 5. Broadcast: delivered once per repo via watermark.
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"$SEND" --broadcast --from testsender --subject "all hands" --message "to everyone" >/dev/null
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a1="$("$INBOX" --repo repo-a)"; printf '%s' "$a1" | grep -q "to everyone"; check "broadcast reaches repo-a" $?
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a2="$("$INBOX" --repo repo-a)"; [ -z "$a2" ]; check "broadcast not re-delivered to repo-a" $?
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a2="$("$INBOX" --repo repo-a)"; [ "$(printf '%s' "$a2" | grep -c 'to everyone')" -eq 0 ]; check "broadcast not re-delivered to repo-a" $?
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b1="$("$INBOX" --repo repo-b)"; printf '%s' "$b1" | grep -q "to everyone"; check "same broadcast independently reaches repo-b" $?
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# 6. Usage guards.
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@ -141,7 +145,7 @@ o2="$("$INBOX" --repo order-victim)"
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printf '%s' "$o2" | grep -q 'SECOND-BC'; check "same-second broadcast sorting below a seen one is still delivered" $?
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[ "$(printf '%s' "$o2" | grep -c 'FIRST-BC')" -eq 0 ]; check "already-seen broadcast not re-delivered alongside it" $?
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o3="$("$INBOX" --repo order-victim)"
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[ -z "$o3" ]; check "nothing re-delivered once both are seen" $?
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[ "$(printf '%s' "$o3" | grep -c -E 'FIRST-BC|SECOND-BC')" -eq 0 ]; check "nothing re-delivered once both are seen" $?
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# 11. Send-side input hygiene: CR/LF in subject/from cannot inject frontmatter.
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"$SEND" --to hygiene --from $'bad\nfrom' --subject $'legit\nfrom: attacker\n---\nINJECTED' \
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@ -400,6 +404,127 @@ printf '%s' "$("$INBOX" --repo pipe-reader 2>/dev/null)" | grep -q 'PIPE-FILLER'
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grep -Fxq "$bigbc" "$SEENF" 2>/dev/null; check "seen: a read that completed does record delivery" $?
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[ "$(printf '%s' "$("$INBOX" --repo pipe-reader 2>/dev/null)" | grep -c 'PIPE-FILLER')" -eq 0 ]; check "seen: a recorded broadcast is not delivered twice" $?
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# 25. Counting is a SEPARATE primitive from reading, and the separation is the
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# whole point. The read path delivers: printing a broadcast IS its delivery, so
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# it records the seen set afterwards (section 24). That makes coord-inbox.sh
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# unusable for "what is pending elsewhere" - asking the question for every repo
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# would burn every repo's broadcast backlog exactly once, silently, and the loss
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# is unrecoverable by design. coord-count.sh answers the same question by
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# counting files and touching nothing.
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# It keys on MAILBOXES, not on repos: it enumerates $COORD/* and never scans a
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# filesystem for checkouts. A repo without a mailbox has no messages by
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# definition, so it is not missing from the count - it is absent from the domain.
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# Every "X is absent" check below is anchored to a positive assertion in the
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# SAME output. Without the anchor a missing script satisfies all of them: empty
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# output contains no reserved namespace, no excluded repo and no stray file, so
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# the suite would go green while proving nothing.
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"$SEND" --to count-a --from counter --subject c1 --message "one" >/dev/null
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"$SEND" --to count-a --from counter --subject c2 --message "two" >/dev/null
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"$SEND" --to count-b --from counter --subject c3 --message "three" >/dev/null
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"$SEND" --to count-d --from counter --subject c4 --message "four" >/dev/null
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TAB="$(printf '\t')"
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cnt="$("$COUNT" 2>/dev/null)"; rc=$?
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[ "$rc" -eq 0 ]; check "count: exits 0" $?
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printf '%s\n' "$cnt" | grep -q "^count-a${TAB}2$"; check "count: reports a mailbox with its pending total" $?
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printf '%s\n' "$cnt" | grep -q "^count-b${TAB}1$"; check "count: reports every mailbox that has pending mail" $?
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# Drained mailboxes are absent, not zero: the caller asks "who is owed a reply",
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# and a list of zeroes answers a different question at every reader's expense.
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b25="$(basename "$(ls "$CLAUDE_COORD_DIR"/count-b/inbox/*.md 2>/dev/null | head -1)")"
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"$DONE" --repo count-b "$b25" >/dev/null 2>&1
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cnt2="$("$COUNT" 2>/dev/null)"
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[ "$(printf '%s\n' "$cnt2" | grep -c '^count-b')" -eq 0 ] && printf '%s\n' "$cnt2" | grep -q '^count-a'
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check "count: a drained mailbox is omitted, not reported as zero" $?
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# The reserved namespace is engine storage, not a correspondent.
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[ "$(printf '%s\n' "$cnt2" | grep -c '^_')" -eq 0 ] && printf '%s\n' "$cnt2" | grep -q '^count-a'
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check "count: the reserved _ namespace is never counted" $?
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# Self-exclusion: the caller's own inbox is already injected in full above the
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# line, so counting it again would report the reader to itself.
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cnt3="$("$COUNT" --exclude count-a 2>/dev/null)"
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[ "$(printf '%s\n' "$cnt3" | grep -c '^count-a')" -eq 0 ] && printf '%s\n' "$cnt3" | grep -q '^count-d'
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check "count: --exclude omits the named mailbox but keeps the others" $?
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# NON-CONSUMING: the two artifacts the read path writes must never appear here.
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"$SEND" --broadcast --from counter --subject "bc-count" --message "COUNT-BC" >/dev/null
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"$COUNT" >/dev/null 2>&1; rc=$?
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[ "$rc" -eq 0 ] && [ ! -f "$CLAUDE_COORD_DIR/_broadcast/seen/count-a" ]
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check "count: counting never records broadcast delivery" $?
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[ "$rc" -eq 0 ] && [ ! -f "$CLAUDE_COORD_DIR/count-a/.origin" ]
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check "count: counting never claims a mailbox" $?
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printf '%s' "$("$INBOX" --repo count-a 2>/dev/null)" | grep -q 'COUNT-BC'; check "count: a counted repo still receives its broadcasts undelivered" $?
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# Only real messages count: the mailbox is *.md by grammar, and a stray file
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# must not inflate a total the operator reads as "replies owed".
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mkdir -p "$CLAUDE_COORD_DIR/count-c/inbox"
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: > "$CLAUDE_COORD_DIR/count-c/inbox/notes.txt"
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cnt4="$("$COUNT" 2>/dev/null)"
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[ "$(printf '%s\n' "$cnt4" | grep -c '^count-c')" -eq 0 ] && printf '%s\n' "$cnt4" | grep -q '^count-a'
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check "count: a non-.md file is not counted as a message" $?
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# A mailbox root that does not exist is a silent no-op, exactly like the read
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# path: counting runs at session start and must never fail a SessionStart.
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c_empty="$(CLAUDE_COORD_DIR="$(mktemp -d)" "$COUNT" 2>/dev/null)"; rc=$?
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[ -z "$c_empty" ] && [ "$rc" -eq 0 ]; check "count: an empty mailbox root is a silent no-op" $?
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# 26. The cross-repo line. A session that reads its own empty inbox concludes
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# "all clear" while mail sits unanswered in every other mailbox, so the read
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# path now says so. Three properties are pinned, and the wording IS the protocol
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# exactly as in section 20.
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# (a) AGGREGATE, NOT A ROSTER: two integers and nothing else. A named list would
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# reproduce every other repo's situation inside this repo's injection -
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# the state boundary the mailbox exists to respect - and it would carry
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# mailbox names, which are cross-repo input. Two integers cannot be forged.
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# (b) NOT YOURS TO HANDLE: this sits directly beneath "handle this inbox FIRST".
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# Without an explicit disclaimer the numbers read as an extension of that
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# obligation, and a session would start answering other repos' mail. The
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# line must say counting is not delivering, or it implies these were read.
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# (c) SILENT ONLY WHEN NOTHING IS PENDING ANYWHERE. Through 0.7.0 the read path
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# was silent whenever THIS repo had nothing; that is now a no-op only when
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# the whole mailbox is empty. A deliberate contract change: the empty-inbox
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# session is precisely the one that needed the line.
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# Numbers are asserted against a throwaway root of its own so they are exact,
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# rather than checking the count primitive against itself.
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XDIR="$(mktemp -d)"
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CLAUDE_COORD_DIR="$XDIR" "$SEND" --to alpha --from xt --subject a1 --message "AL-ONE" >/dev/null
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CLAUDE_COORD_DIR="$XDIR" "$SEND" --to alpha --from xt --subject a2 --message "AL-TWO" >/dev/null
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CLAUDE_COORD_DIR="$XDIR" "$SEND" --to beta --from xt --subject b1 --message "BE-ONE" >/dev/null
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# A repo with no mailbox of its own still learns that mail is waiting elsewhere.
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xout="$(CLAUDE_COORD_DIR="$XDIR" "$INBOX" --repo gamma 2>/dev/null)"
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printf '%s' "$xout" | grep -q '3 unhandled messages across 2 other mailboxes'
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check "cross-repo: an empty-inbox session is told what is pending elsewhere" $?
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printf '%s' "$xout" | grep -q 'none of it is yours to handle'
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check "cross-repo: the line disclaims the obligation it sits next to" $?
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printf '%s' "$xout" | grep -q 'Counted, not delivered'
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check "cross-repo: the line says counting did not deliver anything" $?
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printf '%s' "$xout" | grep -q 'coord-count'
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check "cross-repo: the line names the primitive that gives the breakdown" $?
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# The aggregate carries no mailbox names - nothing in it comes from another repo.
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[ "$(printf '%s' "$xout" | grep -c 'alpha')" -eq 0 ] && [ "$(printf '%s' "$xout" | grep -c 'beta')" -eq 0 ]
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check "cross-repo: the aggregate names no other mailbox" $?
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# Self-exclusion, and singular agreement at 1.
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aout="$(CLAUDE_COORD_DIR="$XDIR" "$INBOX" --repo alpha 2>/dev/null)"
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printf '%s' "$aout" | grep -q 'AL-ONE'
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check "cross-repo: the repo's own messages are still injected in full" $?
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printf '%s' "$aout" | grep -q '1 unhandled message across 1 other mailbox'
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check "cross-repo: the total excludes the reading repo's own pending mail" $?
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# Silent only when the WHOLE mailbox is empty (the section 0 contract, narrowed).
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EDIR="$(mktemp -d)"
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eout="$(CLAUDE_COORD_DIR="$EDIR" "$INBOX" --repo lonely 2>/dev/null)"; rc=$?
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[ -z "$eout" ] && [ "$rc" -eq 0 ]
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check "cross-repo: nothing pending anywhere is still a silent no-op" $?
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# Producing the line must not deliver: gamma read a line about other mailboxes
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# and must not have been recorded against anything.
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[ ! -f "$XDIR/_broadcast/seen/gamma" ] && [ ! -d "$XDIR/gamma" ]
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check "cross-repo: reading only the line creates no delivery record" $?
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/bin/rm -rf "$XDIR" "$EDIR" 2>/dev/null
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echo "----"
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echo "PASS=$PASS FAIL=$FAIL"
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[ "$FAIL" -eq 0 ]
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