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…ages Eight-part overhaul that turns the directed-agent `task_message` system into a real coordination channel instead of a one-shot inbox. `@colony/core`: - `MessageMetadata` gains `expires_at`, `retracted_at`, `retract_reason`, `claimed_by_session_id` / `claimed_by_agent` / `claimed_at`. New `expired` and `retracted` terminal statuses. `parseMessage` backfills the new fields to `null` so legacy rows still pass strict-null predicates without a migration. - `TaskThread.postMessage` accepts `expires_in_ms`, auto-claims a still- unclaimed `to_agent='any'` broadcast on reply, and keeps reply-chain depth authoritative at 1-deep — only the immediate parent flips to `replied`. - New `TaskThread.retractMessage` (sender-only, refuses already-replied) and `TaskThread.claimBroadcastMessage` (idempotent for existing claimer, rejects directed messages with `NOT_BROADCAST`). - `markMessageRead` writes a sibling `message_read` observation so the original sender's preface can render read receipts; past-TTL reads flip status to `expired` and throw `MESSAGE_EXPIRED`. - Inbox queries filter retracted, expired, and other-agents'-claimed broadcasts. `MessageSummary` surfaces `expires_at`, `is_claimable_broadcast`, and the claim state. - `buildAttentionInbox` adds `summary.blocked`, `coalesced_messages`, and `read_receipts` (drops once recipient replies). New `read_receipt_window_ms` / `read_receipt_limit` options. `@colony/mcp-server`: - `task_message` accepts `expires_in_minutes` (max 7 days). - New `task_message_retract` and `task_message_claim` tools. - `task_messages` shape now includes `expires_at`, `is_claimable_broadcast`, `claimed_by_session_id`, `claimed_by_agent`. - Tool descriptions document the 1-deep reply contract, retract semantics, TTL behavior, and broadcast-claim flow. Tests: 71 in `@colony/core` + 33 in `@colony/mcp-server` (8 new), covering TTL expiry/lazy-flip, retract guards, broadcast claiming, auto-claim on reply, read-receipt drop on reply, blocked summary, and legacy-row backward compatibility. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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