| # SPEC-EVENTS — session event registry & hash-chaining |
|
|
| Every session appends to a local, hash-chained, append-only JSONL log: |
| `.freestream/sessions/<session-id>/events.jsonl`. A session is therefore a |
| **verifiable artifact**: tamper with any line and `verify()` fails. |
|
|
| ## Chain format |
|
|
| One JSON object per line: |
|
|
| ```json |
| {"seq": 3, "ts": 1759600000.123, "type": "session.status", |
| "payload": {"status": "ready"}, |
| "prev": "<64-hex sha256 of entry 2>", "hash": "<64-hex>"} |
| ``` |
|
|
| - `hash = sha256(canonical({"seq","ts","type","payload","prev"}))` |
| where canonical = `json.dumps(sort_keys=True, separators=(",",":"))`. |
| - First entry's `prev` is the 64-zero genesis hash. |
| - `EventLog(path).verify() -> (ok, first_bad_seq)`; appending to a broken |
| chain raises instead of extending a lie. |
|
|
| ## Registry |
|
|
| Types are namespaced. The initial registry: |
|
|
| | Type | Emitted by | Payload | |
| |---|---|---| |
| | `session.requested` | CLI join | platform, driver, bot_name, voice, rung, meet_url | |
| | `session.created` | CLI join | session_id, driver | |
| | `session.status` | driver poll | status | |
| | `session.ready` | CLI join | session_id | |
| | `session.failed` | CLI join | status | |
| | `session.timeout` | CLI join | — | |
| | `driver.join_attempted` | driver | driver, platform | |
| | `persona.rung_change` | avatar backend | from, to, reason | |
| | `asr.partial` / `asr.final` | ASR loop | text, speaker, confidence | |
| | `agent.speak` | MCP session.speak / bot | text | |
| | `agent.action` | CharacterAgent | text — in-fiction physical actions, never spoken | |
| | `agent.tool` | toolbelt | tool, args, ok, output — every terminal/file call, audited | |
| | `asr.speculative` | speculative dispatch | text, seconds, audio_s — dispatched at ~300ms of silence | |
| | `agent.speculative_canceled` | speculative turn | reason: speech_resumed (before playout) | |
| | `turn.completed` | bot | total_s, asr_s, speculative, throttled_periods, throttled_ms | |
| | `tts.synthesized` | persona | text, chars, backend | |
| | `avatar.frame_clock` | avatar backend | fps, rung | |
| | `persona.posture` | bot render loop | mode — idle/thinking/working/speaking on change | |
| | `session.leave` | CLI leave | session_id | |
| |
| Rules: |
| |
| 1. Additions to the registry append; never repurpose or delete a type. |
| 2. Payloads contain no raw audio or image bytes — references only |
| (durations, paths, hashes of the bytes). |
| 3. `asr.partial` entries are prunable: a compaction pass may drop them and |
| re-issue a `log.compacted` entry, but the chain never breaks. |
| 4. Logs are the replay input: a session log + the persona assets is a |
| full deterministic replay of what the bot said and when. |
