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:
{"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
previs 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:
- Additions to the registry append; never repurpose or delete a type.
- Payloads contain no raw audio or image bytes — references only (durations, paths, hashes of the bytes).
asr.partialentries are prunable: a compaction pass may drop them and re-issue alog.compactedentry, but the chain never breaks.- Logs are the replay input: a session log + the persona assets is a full deterministic replay of what the bot said and when.