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test+docs: add group_topics tests and documentation

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- 7 new tests covering skill binding, fallthrough, coercion
- Docs section in telegram.md with config format, field reference,
  comparison table, and thread_id discovery tip
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Teknium 2026-04-03 15:06:44 -07:00 • committed by Teknium
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website/docs/user-guide/messaging/telegram.md
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@ -312,6 +312,71 @@ For example, a topic with `skill: arxiv` will have the arxiv skill pre-loaded wh
Topics created outside of the config (e.g., by manually calling the Telegram API) are discovered automatically when a `forum_topic_created` service message arrives. You can also add topics to the config while the gateway is running — they'll be picked up on the next cache miss.
:::
## Group Forum Topic Skill Binding
Supergroups with **Topics mode** enabled (also called "forum topics") already get session isolation per topic — each `thread_id` maps to its own conversation. But you may want to **auto-load a skill** when messages arrive in a specific group topic, just like DM topic skill binding works.
### Use case
A team supergroup with forum topics for different workstreams:
- **Engineering** topic → auto-loads the `software-development` skill
- **Research** topic → auto-loads the `arxiv` skill
- **General** topic → no skill, general-purpose assistant
### Configuration
Add topic bindings under `platforms.telegram.extra.group_topics` in `~/.hermes/config.yaml`:
```yaml
platforms:
telegram:
extra:
group_topics:
- chat_id: -1001234567890 # Supergroup ID
topics:
- name: Engineering
thread_id: 5
skill: software-development
- name: Research
thread_id: 12
skill: arxiv
- name: General
thread_id: 1
# No skill — general purpose
```
**Fields:**
| Field | Required | Description |
|-------|----------|-------------|
| `chat_id` | Yes | The supergroup's numeric ID (negative number starting with `-100`) |
| `name` | No | Human-readable label for the topic (informational only) |
| `thread_id` | Yes | Telegram forum topic ID — visible in `t.me/c/<group_id>/<thread_id>` links |
| `skill` | No | Skill to auto-load on new sessions in this topic |
### How it works
1. When a message arrives in a mapped group topic, Hermes looks up the `chat_id` and `thread_id` in `group_topics` config
2. If a matching entry has a `skill` field, that skill is auto-loaded for the session — identical to DM topic skill binding
3. Topics without a `skill` key get session isolation only (existing behavior, unchanged)
4. Unmapped `thread_id` values or `chat_id` values fall through silently — no error, no skill
### Differences from DM Topics
| | DM Topics | Group Topics |
|---|---|---|
| Config key | `extra.dm_topics` | `extra.group_topics` |
| Topic creation | Hermes creates topics via API if `thread_id` is missing | Admin creates topics in Telegram UI |
| `thread_id` | Auto-populated after creation | Must be set manually |
| `icon_color` / `icon_custom_emoji_id` | Supported | Not applicable (admin controls appearance) |
| Skill binding | ✓ | ✓ |
| Session isolation | ✓ | ✓ (already built-in for forum topics) |
:::tip
To find a topic's `thread_id`, open the topic in Telegram Web or Desktop and look at the URL: `https://t.me/c/1234567890/5` — the last number (`5`) is the `thread_id`. The `chat_id` for supergroups is the group ID prefixed with `-100` (e.g., group `1234567890` becomes `-1001234567890`).
:::
## Recent Bot API Features
- **Bot API 9.4 (Feb 2026):** Private Chat Topics — bots can create forum topics in 1-on-1 DM chats via `createForumTopic`. See [Private Chat Topics](#private-chat-topics-bot-api-94) above.