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## Summary App-hosted agents (buzz-app agents2) run inside the desktop app without a socket per agent, so they can't send their own kind 20001 presence and always read as offline — including to their owner on another device. This adds **kind 20003, an owner's presence for its agents**: - Owner-signed; `content` is the status (`online` / `away` / `offline`); each `p` tag names an agent (1–256 distinct). - WebSocket only (rejected on HTTP ingest, like 20001). - The relay keeps only the agents the signer owns (`users.agent_owner_pubkey`) — cached `true` from `observer_owner_cache`, the rest resolved with one `list_agents_for_owner` query. Only positive links are cached, so a just-linked agent isn't hidden for the cache TTL and the observer path isn't poisoned. - Sets (180s TTL) or clears each agent's presence in one Redis round trip, the same keys kind 20001 writes, so the presence snapshot reports them with no client change. - Not fanned out: live presence is matched by author, and the author here is the owner. A new kind rather than `p` tags on 20001, so a relay without this ignores the batch instead of storing it as the owner's own presence. ## Testing - `agent_presence_request_names_distinct_agents_with_a_known_status` (unit). - `presence_storage_postgres_tests::agent_presence_stores_only_owned_agents` (Postgres + Redis): only the owner's agent goes online, another owner's agent doesn't, a pre-cached `false` doesn't hide a linked agent, and `offline` clears it. All 5 presence Postgres tests pass via `scripts/postgres-test-run.sh -p buzz-relay --lib -E 'test(/presence/)'`. - `buzz-pubsub` ignored Redis test `test_presence_many_sets_with_ttl_and_clears` passes. - clippy clean. Plain `cargo test` failures locally were environmental only (buzz-media "role buzz does not exist", mesh_demo 504). - Not yet exercised end to end against a local relay + app. App side: block/buzz-app#862. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: Bradley Axen <baxen@squareup.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>