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Implements RFC-001 P1 (the first shippable slice): deterministic Matrix presence/liveness on a single-instance dev Synapse. - infra/matrix/: DEV Synapse (RFC-002 Mode B, federation OFF, self-signed TLS, enable_registration:false, appservice registration wired). Rendered from parameterized templates — zero hardcoded topology. .data is gitignored. - packages/comms/: minimal MACP presence SDK — set presence, run the mosaic.presence heartbeat (seq + interval per RFC-001 §4.5), and a deterministic liveness reader (online/away/offline from heartbeat age, NOT native-presence-timeout). Liveness core written RED-FIRST. 19 vitest tests. - tools/matrix-presence-harness/: minimal provisioner (registers >=3 agent MXIDs, creates the fleet presence room, joins them — reuses the existing @mosaicstack/appservice intent lib) + an E2E validation harness proving A2/A3/A4 against a real Synapse. - eslint.config.mjs: register packages/comms/vitest.config.ts with the type-aware project service (same as other packages' vitest configs). DEV-compose validated only; production deploy is a separate coordinated step (deploy-holds respected). Part of the comms-evolution program (RFC-001 P1) Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0158NZqN2n2ymKFeJAZ4GUCb
@mosaicstack/comms
MACP presence SDK — the P1 (presence) slice of RFC-001 (§4.5 liveness,
§4.2 event envelope). Minimal by design: set Matrix presence, run the
mosaic.presence heartbeat, and compute deterministic fleet liveness.
Out of P1 scope (later phases): enrollment/auto-detect, room taxonomy, per-agent token minting, signed-authorship, federation.
API
classifyLiveness(ageMs, policy)/computeFleetLiveness(observations, now, policy)— pure, deterministic online/away/offline from heartbeat age. The authoritative liveness source (RFC-001 §4.5): native Matrix presence is not relied upon.HeartbeatEmitter/startHeartbeatLoop(...)— build and drive themosaic.presenceheartbeat (monotonicseq,interval_ms).MinimalMatrixClient— tiny C-S client:setPresence,sendHeartbeat,readHeartbeats,joinRoom. Supports Application-Service masquerade (actAsUserId) for the P1 provisioner, or a per-agentaccessToken.PresenceAgent— high-level: join the fleet room, go present, heartbeat.pauseHeartbeat()models a crash (no graceful signal).FleetLivenessReader— reads the fleet room and computes the liveness board (read()/formatBoard()), the surface a human or watchdog reads.
Liveness policy (RFC-001 §4.5)
online : age <= heartbeatIntervalMs * missTolerance
away : age < darkThresholdMs
offline: otherwise (or never-seen / non-finite age -> fail safe to offline)
Defaults: interval 30s, miss-tolerance 2, dark-threshold 10min
(DEFAULT_LIVENESS_POLICY). All runtime-tunable per RFC-002 §5.3.
Tests
pnpm --filter @mosaicstack/comms test — the liveness core is written
RED-FIRST; an end-to-end proof against a real Synapse lives in
tools/matrix-presence-harness.