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zulip-platform-plugins/docs/adr/ADR-006-all-bots-model.md
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feat: DM-First v2 architecture - Tanko live on CT 112
Architecture change: DM-First (v2) replaces @mention-in-stream (v1) as primary
agent interaction channel. See ADR-001-dm-topology and ADR-002-dm-routing.

Key changes:
- New DM-first Zulip adapter (adapter_dm.py) deployed on CT 112
  - Registers empty narrow to receive ALL events
  - Demuxes DMs (type: 'private') vs stream events
  - Replies to DMs back in private thread, stream replies to #agent-hub
  - Uses blocking long-poll (dont_block=False) to eliminate rate limiting
- Rewritten ARCHITECTURE.md, CONTEXT.md, PRD.md for v2 DM-First
- New ADRs: ADR-001 (DM Topology), ADR-002 (DM Routing)
- Archived old ADRs: 001, 002, 005 (topic-topology, mention-routing, mention-detection)
- Updated ADRs: 003 (agent-naming), 004 (per-agent-bots), 006 (all-bots-model)
- Updated PI extension (index.ts) with DM-aware patterns
- Tanko agent confirmed responding in both DM and @all-bots in #agent-hub
2026-06-21 07:50:30 -04:00

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# ADR 6: @all-bots via Content-Based Detection
**Date**: 2026-06-21 (supersedes 2026-04-28 dedicated bot user approach)
### Decision
`@all-bots` is detected via **content-based mention matching** on messages in the `#agent-hub` stream. Each bot subscribes to `#agent-hub` and uses regex to detect `@**all-bots**` or `@**All Bots**` in message content. A dedicated "All Bots" Zulip bot user is **not required**.
### Context
The original design required a 7th Zulip bot user (`all-bots@chat.sysloggh.net`) with display name `All Bots`. This user was never created during initial bot provisioning. Additionally:
- Bot users cannot reliably detect @mentions of other bot users in Zulip 12.0 (ADR-005 archived)
- Content-based regex matching (`@**all-bots**`) works on any Zulip message regardless of SDK version
- Under the DM-first architecture (ADR-001), bot-event stream subscription to `#agent-hub` is the **only** stream-level listener needed — all other communication uses DMs
### Behavior
```
User posts in #agent-hub > topic:
"@**all-bots** status report please"
→ Each bot receives event via #agent-hub subscription
→ Each bot checks: /@\*\*(?:all-bots|All Bots)\*\*/i.test(content)
→ If match: bot forwards message to its agent
→ 6 independent responses appear in the topic
```
### Active Stream Subscription
Under DM-first architecture, each agent's plugin maintains **one** stream subscription:
- **Stream:** `#agent-hub`
- **Purpose:** Only for detecting `@all-bots` broadcasts
- **Filter:** Ignore all non-`@all-bots` messages in the stream
- **Primary channel:** DMs for all agent-owner communication
### Consequences
- **Positive:** No need to create/manage a 7th dedicated bot user
- **Positive:** Content-based detection works reliably across Zulip versions (no SDK dependency)
- **Positive:** Same regex works for case-insensitive matching (`all-bots` / `All Bots`)
- **Negative:** Slightly more processing per message (regex check)
- **Negative:** If `@all-bots` syntax changes in Zulip, regex must update
- **Neutral:** All 6 bots still independently detect and respond — same multi-response pattern