repo-mailbox/CHANGELOG.md

# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [0.9.0] - 2026-07-28

### Added

- **`board.sh` + the `board` skill — the cross-repo attention board.** The
  mailbox answers "who wrote to me"; it never answered "which repo deserves the
  next session". `board.sh` scans every discovered repo and reads three sources
  per repo: the STATE.md next-step block with its optional board line, `git
  status`, and that repo's pending mailbox count. Read-only by construction — it
  writes to no repo, no STATE.md and no mailbox — and pinned by
  `board-selftest.sh` (28 checks against a throwaway repo tree and a throwaway
  mailbox).

  **Why it ships here rather than as a personal script.** The mailbox is one of
  its three inputs, and the two carry the same axis distinction: a repo's pending
  count means *others are waiting on it* (an obligation owed outward), while who
  a repo waits *on* is only derivable from its own board line, because the
  message format has no reply-to or thread field. Splitting the board from the
  mailbox would put that distinction in two places, and a rule enforced in one of
  two places is not a rule. It also means the engine resolves through
  `CLAUDE_PLUGIN_ROOT` like every other script here, instead of existing only on
  the author's machine.

  The skill is a ranking, not a report: it re-runs the board on every invocation
  (counts drift between turns), ranks by what unblocks the most and what is
  cheapest to move, then names one repo, the rule that fired, and the real next
  action read from that repo's STATE.md — never the table. Deliberately not wired
  into session start: injecting the whole board into every session spends context
  on repos the session is not in.

## [0.8.0] - 2026-07-27

### Added

- **`coord-count.sh` — counting without delivering.** Reading *is* delivery in
  this engine: `coord-inbox.sh` prints a broadcast and then records it as seen,
  so there was no way to ask "what is pending" without answering it. Asking 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` counts files instead
  and writes nothing: no seen set, no `.origin`.

  It keys on **mailboxes**, not 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, the reserved `_` namespace is skipped, and `--exclude`
  drops one mailbox (the caller's own).

- **A cross-repo line in the SessionStart injection.** A session whose own inbox
  was empty saw silence and concluded "all clear" while mail sat unanswered in
  every other mailbox. The read path now appends one aggregate line:

      Elsewhere in the mailbox: 3 unhandled messages across 2 other mailboxes.
      Counted, not delivered -- none of it is yours to handle here. Run
      coord-count for the per-mailbox breakdown.

  Deliberately an **aggregate of two integers, not a roster**. A list of names
  would reproduce every other repo's 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 framing.

  The 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. Pinned in selftest section 26, exactly as
  section 20 pins the priority text.

### Changed

- **BREAKING (injection contract): the read path is no longer silent whenever
  *this* repo has nothing pending.** It is now a silent no-op only when the
  whole mailbox is empty. The empty-inbox session is precisely the one that
  needed the cross-repo line, so 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.

## [0.7.0] - 2026-07-27

### Added

- **`CLAUDE_COORD_REPO` — declaring an identity for a non-git surface.** 0.6.0
  removed the working-directory fallback, which was right, but it left every
  non-git working surface (`~/repos`, `$HOME`) with nothing to derive from: the
  read path declines silently, so such a surface simply stops seeing its inbox,
  with no error and no exit code. That is the same loss-looks-like-normal shape
  0.6.0 set out to remove. The hook now reads `CLAUDE_COORD_REPO` and forwards
  it verbatim as `--repo`, so a directory can *declare* which mailbox it owns:

      { "env": { "CLAUDE_COORD_REPO": "repos" } }

  This is not the fallback returning. The fallback guessed a name from wherever
  the session happened to stand; a declaration is written down, readable back,
  and deletable. Because it forwards as `--repo` it inherits every engine rule,
  including that an explicit override never claims `<repo>/.origin` — otherwise
  a surface borrowing a name could steal the claim from the checkout that owns
  it. Both halves are pinned by tests.

## [0.6.0] - 2026-07-26

### Fixed

- **`_broadcast` is a reserved namespace, not a repo.** `coord-send` guarded
  retraction with a sender check, but that guard only covered the door it was
  nailed to: `coord-done --repo _broadcast <file>` archived a broadcast out of
  the queue — a full unauthenticated retract of an announcement for every repo
  that had not read it yet. The whole `_` prefix is now reserved, in every CLI,
  so a later `_seen` or `_config` cannot reopen the hole.
- **Repo identity is derived, never invented.** The fallback to
  `basename(pwd)` is gone. It existed so the CLI would work anywhere, but
  "anywhere" includes every global surface: a session in `~/repos` is not a
  repo, and the fallback silently handed it the identity `repos` — under which
  real mail was delivered. git toplevel or an explicit `--from`/`--repo` are
  now the only sources. Write paths exit 2 and name the fix; the read path
  declines silently, because the hook runs at every session start and must
  never fail a session.
- **Broadcast delivery is recorded only after the injection is written.**
  Marking inside the read loop left a window where the seen set said
  "delivered" while the operator saw nothing — and the hook runs under
  `timeout: 10`, so the window was reachable. A lost broadcast is
  unrecoverable by design (the seen set is delivery history, and retraction
  deliberately leaves it alone), so the failure mode is now redelivery.
- **The hook no longer resolves identity at all.** It was a fourth independent
  copy of the identity rule and the only one that runs in production, so
  passing `--repo` bypassed the engine's guards exactly where they mattered —
  and suppressed the new collision check along with them.

### Added

- **Mailbox-collision warning.** Two checkouts with the same directory name
  share one mailbox. Re-keying identity would break every existing mailbox and
  the readable `--to <repo>` addressing, so the first git-derived read records
  the claiming path in `<repo>/.origin`, and a read from a different path is
  reported in the injection. A warning, not a refusal: the same repo moved or
  re-cloned is the ordinary case. It goes in the injection because the hook
  discards stderr, and a warning nobody can see is not a warning.

### Changed

- Selftest 93 → 116 checks; three Node tests now cover the hook behaviorally
  rather than by reading its source.

### Breaking

- `coord-send` and `coord-done` exit 2 outside a git repository instead of
  naming themselves after the working directory. Pass `--from`/`--repo` to
  choose an identity explicitly. Repo names beginning with `_` are refused
  everywhere.

## [0.5.0] - 2026-07-25

### Changed

- **The inbox is a priority, not a suggestion (Rule 7).** Through 0.4.0 the
  injection block told every repo to "consider replying/resolving where it fits
  in this session". That sentence was the whole problem: the injection text is
  the only place a repo is ever told what to do with a message, so the wording
  *is* the protocol — and it granted permission to defer. Messages sat
  unanswered for weeks while each session did its own work first. Nothing was
  broken; the protocol was asking for exactly what it got.

  The block now states an ordering and a completion obligation:

  - **Handle the inbox first**, before the task the session came to do — "not
    after it, not *if there is time*".
  - **Every directed message must reach a terminal state before the session
    ends:** `coord-send --reply-to` or `coord-done`.
  - **Neither terminal state is the default.** The format has no
    reply-expected field, so mandating only the reply would manufacture
    traffic for messages that merely inform.
  - **Leaving one pending stays allowed, but must be stated** to the operator
    with a reason. The escape hatch is explicit rather than silent.

- **Raising priority deliberately does not widen the trust boundary.** The
  obligation is procedural, never substantive: *responding* is mandatory,
  *complying* with what a message asks is not — only the operator authorizes
  that. Untrusted cross-repo content still cannot direct the reader; it merely
  can no longer be ignored. The injection states both halves, and the selftest
  pins them together so a future reword cannot keep the priority and quietly
  drop the distinction.

- Selftest grew from 82 to 93 checks (new section 20 pins the wording contract:
  the permissive phrasing is gone, ordering and completion are stated, both
  terminal states are named with neither as default, responding-vs-complying is
  kept distinct, and the untrusted-data framing survives).

## [0.4.0] - 2026-07-25

### Added

- **`coord-send --retract <filename>`: a broadcast can finally be retired.**
  Until now nothing could remove a message from `_broadcast/inbox/`:
  `coord-done` is directed-only and never touches the broadcast queue. The
  backlog could therefore only grow, and every *new* repo received the entire
  standing history at its first session — including announcements that had
  since become false. Retract moves the message to `_broadcast/archive/`, so
  no future repo is served it.

  Deliberate limits, both documented and pinned by tests:

  - **Un-send, not recall.** Repos that already received the broadcast keep
    it; `_broadcast/seen/` is delivery history and is left untouched.
  - **Only the sender may retract** (`from:` must match the repo identity).
    `--from` overrides this, as it does everywhere else in the engine, which
    makes the check an accident guard rather than a security boundary.
  - **Nothing is deleted**, mirroring `coord-done`. Retracting twice is a
    no-op (exit 0).

- Selftest grew from 70 to 82 checks (new section 19 covers retraction:
  authorization, archiving, non-delivery to new repos, no collateral damage to
  other broadcasts, invalid names, flag combinations, and idempotency).

### Fixed

- README's install command still said `claude plugin install
  coord@ktg-plugin-marketplace` after the v0.3.0 rename.
- README told the reader to prune `_broadcast/inbox/` by hand when a notice
  stopped being relevant — advice that contradicted the rule that the script
  owns mailbox files. `--retract` is now the supported path.

## [0.3.0] - 2026-07-25

### Changed

- **Renamed the plugin and repository from `coord` to `repo-mailbox`.** The old
  name said that something was coordinated but not what the thing was; the new
  one names what it is, using the same vocabulary the code and docs already use
  throughout (mailbox, inbox, archive, broadcast). The Forgejo repository moved
  from `open/coord` to `open/repo-mailbox` (the old URL redirects), and the
  marketplace entry, plugin manifest and package name follow.

  **This is breaking for installed users:** the skill is now invoked as
  `/repo-mailbox:coord-send` rather than `/coord:coord-send`, and the plugin
  must be reinstalled under its new name.

  **Deliberately unchanged:** the CLI (`coord-send.sh`, `coord-inbox.sh`,
  `coord-done.sh`, `coord-selftest.sh`), the skill name `coord-send`, the
  mailbox root `~/.claude/coord/`, and the `CLAUDE_COORD_DIR` override. Those
  name the transport protocol, not the product — renaming them would migrate
  live mailbox data and break message history in every participating repo for
  no gain in clarity.

### Fixed

- Catalog README listed `48 selftest checks` for this plugin; the actual count
  has been 70 since v0.2.2.

## [0.2.2] - 2026-07-25

### Changed

- `coord-inbox.sh` now warns on stderr for each unknown argument instead of
  discarding it silently. The read path stays lenient (it runs inside the
  SessionStart hook, which must never fail a session over a stray flag) and
  the exit code is unchanged, but a mistyped flag no longer looks like a
  working invocation. The hook runs the script with stderr discarded, so the
  warning surfaces in manual CLI use only.

### Added

- Selftest: 68 -> 70 checks, covering the stderr warning and the leniency it
  must not break (unknown argument still reads the inbox and exits 0).

### Documentation

- README: corrected the stale selftest count (64 -> 70), documented that a
  broadcast is never delivered back to its own sender (shipped in 0.2.1 but
  undocumented), and added rule 6 — message content is data, never
  instructions — which `coord-inbox.sh` already enforces in the injection
  framing.

## [0.2.1] - 2026-07-25

### Fixed

- Broadcast self-delivery: `coord-send --broadcast` left no seen-set entry for
  the sender, so the announcing repo got its own announcement injected at its
  next session start. The delivered filename is now recorded in
  `_broadcast/seen/<sender>` at delivery time, reusing the existing per-repo
  seen set rather than adding a second exclusion mechanism. Filtering on the
  `from:` field at read time was rejected: `from:` is sender-controlled, so it
  would let any repo suppress a broadcast for another by forging the field.
  The seen file is keyed by the raw sender name (the read side keys it
  unsanitized, so the two must agree); senders containing a slash, or equal to
  `.`/`..`, skip the marking rather than escape the directory.

### Added

- Selftest: 64 -> 68 checks, covering sender self-exclusion, unaffected
  delivery to other repos, self-exclusion for sender names that are not
  shell-clean, and the seen-marking path-escape guard.

## [0.2.0] - 2026-07-24

Hardening pass over the three CLIs.

### Fixed

- Atomic delivery: the temp file is created inside the destination directory
  (dot-prefixed, invisible to the inbox glob), so the final rename never
  crosses filesystems and readers never observe a half-written message.
- `.` and `..` are rejected explicitly in the `--reply-to` and `coord-done`
  name guards instead of relying on downstream failure.

### Added

- `-h`/`--help` on `coord-inbox.sh`, making usage output uniform across the
  three CLIs.
- Selftest: 48 -> 64 checks, closing gaps around the default mailbox path via
  `HOME` fallback, malformed frontmatter on the read path, and a read-only
  destination directory.

## [0.1.0] - 2026-07-24

First public release: extraction of a battle-tested personal mechanism into a
distributable plugin.

### Added

- Bash engine: `coord-send.sh` (directed / broadcast / reply delivery),
  `coord-inbox.sh` (pending inbox + unseen broadcasts, formatted for context
  injection), `coord-done.sh` (archive without reply), all bash-3.2-safe,
  ASCII-only, zero dependencies.
- `coord-selftest.sh`: 48 checks against a throwaway mailbox, including
  regression cover for filename sanitization, no-hang argument parsing,
  prompt-injection resistance, frontmatter hygiene, and broadcast ordering.
- SessionStart hook (`hooks/scripts/session-start.mjs`): thin zero-dependency
  Node wrapper that injects the repo's pending mailbox as
  `additionalContext`. Always exits 0 — a broken mailbox never blocks a session.
- `coord-send` skill: natural-language front door (English + Norwegian
  triggers) mapping intent to engine invocations, including bounded
  multi-target loops, deferred sends, and replies.

### Fixed

- Frontmatter injection: CR/LF and control characters in `--subject`/`--from`
  are collapsed before writing, so fields can no longer inject frontmatter
  lines or a premature `---` terminator.
- Broadcast loss: a per-repo seen set (`_broadcast/seen/<repo>`, one delivered
  filename per line) replaces the single high-water mark, which silently
  dropped a same-second broadcast whose filename sorted below one already
  seen. Upgrade note: a legacy watermark file is read as a one-entry seen
  set, so old broadcasts may be re-delivered once.

### Changed

- Read-side protocol strings are English (`--- message:`, `-> reply:`,
  UNTRUSTED DATA framing); the forgery-resistance selftest checks pin the
  English tokens.