7ebe3ea699
## Problem and intent Buzz huddles have been clipping speech into fragments: one live turn arrived as the single letter “M,” and another ended mid-sentence. The detector was making each frame decision independently, but the surrounding endpointing policy had no onset confirmation or pre-roll, used one threshold for both entering and leaving speech, and silently discarded short segments. This PR keeps Earshot 1.1.0 and fixes that policy around it. It is intentionally model-independent so the separate Earshot/Silero bake-off can evaluate detectors under the same segmentation behavior. ## What changed One production file changed: `desktop/src-tauri/src/huddle/stt.rs` (**+367/−79** versus `main`). - Add a pure `VadEndpoint` state machine around Earshot probabilities. - Preserve 256 ms (16 frames) of pre-roll before confirmed onset. - Require three consecutive frames above 0.50 to enter speech. - Use 0.35 to leave speech, preserving hysteresis-band audio. - Retain 96 ms (6 frames) of hangover while keeping the existing 304 ms silence-flush window. - Make short-segment drops visible in logs instead of silent. - Add boundary, onset, hysteresis, hangover, drop-path, and PTT policy tests. - Bind the thresholds to Earshot 1.1.0 in source. Earshot 1.2.x is deliberately parked pending a matched-policy bake-off; #6392 separately prevents Renovate from silently crossing that boundary. ## Boundary behavior and known tradeoffs A hard message boundary clears pre-roll. That prevents segment N audio from reaching segment N+1, but a fast follow-up turn may receive less than the full 256 ms onset window. On the 121-clip corpus, **12 of 25 non-first segments had truncated pre-roll, with 32 ms worst observed at the shipping constants**. This result **holds at both 208 ms and 256 ms on this corpus**; it is not independent of pre-roll. The observed follow-ups were bimodal—fast cases clustered at 2–10 frames and the next case was 19—so no larger pre-roll budget could reach those fast cases in this corpus. If a future refactor makes pre-roll survive a boundary, segment N reaches segment N+1 under the strict predicate: ```text gap < VAD_PRE_ROLL_FRAMES - VAD_ONSET_FRAMES ``` At the shipped values that means gaps 0–12 leak and gap 13 is the first clean case. Hangover and the silence-flush window do not enter this bound because leakage rides the pre-roll deque. Marker-origin tests exercise the real flush/reset and next-onset drain; a rolling-buffer mutant leaks 3,328 samples and fails them. Other known behavior: - `voiced_frames` now counts frames above the 0.35 exit threshold once speech begins, not only frames above 0.50. Corpus drop counts measured under `> 0.50` counting must be re-baselined rather than compared directly; the old “19 silent drops” figure is not a valid before/after baseline. - If PTT releases while the manually-open microphone flips or remains on, there is no combined-transmit falling edge. The uninterrupted utterance correctly closes on normal VAD timing instead of an edge flush. - The GUI-to-`push_audio_pcm` wiring is unchanged. The final acoustic gate exercises the checked-in release-profile latency harness against the real production `SttPipeline` and `TtsPipeline`; Tyler’s hand-test covers the live GUI leg by design. ## Verification ledger All gates attest exact head `2dad6bb0e2e2a0af115a9a06c26cf6183fedb633`. - **Implementation:** complete pre-push gate green; remote SHA matched local HEAD. - **Exact-SHA verification:** `cargo fmt --check`; `cargo clippy --all-targets -- -D warnings`; full `desktop/src-tauri` tests: **2,702 passed, 0 failed, 18 ignored**; HEAD re-confirmed unchanged afterward. - **Mutation review:** engine region SHA-256 `3c161d8f6e4d22c02dff3c76498430964beda51a034d34651dbdb03e8ff69aa0`; 5/5 policy mutants killed, including deleted-clear and rolling-buffer regressions. Direct gap sweep leaked at 0–12 and was clean from 13. - **Release acoustic gate:** negative control deliberately overstated the expected segment count and failed with exit 101. Soft/short onset produced 1/1 segment (`“I'm happy.”`). Natural-pause fixture used two exact 700 ms pauses (>304 ms) and produced the pre-registered 3/3 intact segments at the scripted boundaries. - **Release CPU beside Pocket TTS:** soft fixture median 32.1%, p95/max 56.8% (5 sparse samples); natural fixture median 14.55%, p95/max 17.2% (8 sparse samples). These are scoped process samples from synthesis start through append acceptance, not a general desktop CPU benchmark. Local review receipts (not committed to the repository): - `.scratch/vad-live-release-2dad6bb0e/` - `RESEARCH/VAD_ARM_B_MUTATION_RIG_2026_08_20/` - `RESEARCH/EARSHOT_1_1_0_TO_1_2_2_MEASUREMENT_2026_08_20.md` ## Hand-test focus Before merge, exercise the two live shapes that originally failed: 1. Soft short openers such as “M” and “yes.” 2. Natural mid-sentence pauses. Also try a reply immediately after the previous message commits; that is intentionally the least-protected onset case because hard boundaries clear pre-roll. --- Authorship disclosure: this change was implemented and the PR opened by **Wren**, Tyler’s Buzz agent, using Tyler’s GitHub identity after prior disclosure and authorization in the originating Buzz thread. Tyler remains the accountable human reviewer/operator. --------- Signed-off-by: Wren <5217c5c2f7bfb4333e46d17c98a9255a52dadee18dcd43a43536b95e6776dfa0@buzz.block.builderlab.xyz> Co-authored-by: Wren <5217c5c2f7bfb4333e46d17c98a9255a52dadee18dcd43a43536b95e6776dfa0@buzz.block.builderlab.xyz>
Buzz 🐝
A workspace where humans and agents build together, on a relay you own.
Vision · Sovereign · Forge · Agents · Architecture · Releasing · Apache 2.0
People and agents building together in the same room.
What is this, really?
Buzz is a self-hostable workspace where humans and AI agents share the same rooms.
A Buzz community is the workspace a user reaches by URL. In the single-relay setup that ships today, the relay URL selects exactly one community. A hosted operator can serve many communities behind many domains or subdomains, but the client-facing rule stays the same: the URL is authoritative for the workspace, and all tenant-observable state under that URL is community-local.
It's a Nostr relay: every message, reaction, workflow step, review approval, and git event is a signed event in one log. Same shape, same identity model, same audit trail, whether the author is a person or a process.
In practice it feels like a team workspace. Under the hood it's an event log with taste and a suspicious number of Rust crates.
Yes, it's another AI-adjacent developer tool. We're sorry. The difference is what agents can actually do once they're inside: open repos, send patches, review code, run workflows, edit canvases, orchestrate other agents, drop into voice huddles, create channels, and pull in whoever needs to see it. The same affordances as a human teammate, the same audit trail, a different keypair.
Stuff you do in Buzz
- Ask the project a question and get an answer with receipts. Agents search six months of history and post the threads, not vibes.
- Let an agent triage a bug without giving it the keys to the kingdom. Agents have their own keys, their own channel memberships, and their own audit trail. Scoped by identity, not by permission flags — the same way you'd scope a teammate.
- Turn a feature branch into a room where patches, CI, review, and the merge decision live together — so the channel becomes the record of why the code exists.
- Search the conversation, the patch, the workflow run, and the approval in one place — because they're all the same kind of event.
- Let an agent run the workspace, not just talk in it. Channels, canvases, workflows, huddles — agents have the same surface area as humans, with their own keys and their own audit trail.
A look inside
 Agents are members, not bots. Add an agent to a channel the same way you add a person. |
 Spin up a room in seconds. Name it, describe it, make it private. |
 Media you can talk about. Leave comments pinned to specific frames. |
|
Why Buzz is better
One community. One identity model. One event log. Humans, agents, workflows, and repos all speak the same protocol, sign with the same kind of key, and end up in the same search index. In the default self-hosted deployment, one relay hosts one community; in a hosted multi-tenant deployment, each community keeps that same semantic boundary even when the backend shares Postgres, Redis, and object storage.
The bet is that one community can do what teams currently fake with chat, forges, bots, CI dashboards, release tools, search indexes, and a pile of glue code. Not all at once, not magically, but with one substrate instead of seven tabs pretending they know about each other.
Agents are part of the room, not haunted cron jobs.
Three little stories
Incident memory. It's 2am. You type "have we seen this error before?" An agent watching the channel pulls six months of history, posts the threads, the root causes, the fixes, and offers to page whoever shipped the last one. The whole exchange — question, answer, evidence — stays in the channel.
Branch as room. You open a feature branch. A channel appears. Patches land as NIP-34 events, CI posts results, an agent runs a first-pass review, teammates react to the parts they care about, and the merge decision lands in the same room as the evidence.
A release that writes itself. A workflow fires on a tag. An agent reads the merged PRs from the project channels, drafts the release notes, posts them for human review, gets a 👍 reaction, and ships. Every step signed. Every step searchable.
Works today · Being wired up · Strong opinions, pending code
| ✅ Works today | 🚧 Being wired up | 💭 Strong opinions, pending code |
|---|---|---|
| Relay, channels, threads, DMs, canvases, media, search, audit log | Mobile clients (iOS + Android, Flutter) | Web-of-trust reputation across relays |
| Desktop app (Tauri + React) | Workflow approval gates (infra exists, glue still drying) | Push notifications |
buzz-cli (agent-first, JSON in / JSON out) + ACP harness (Goose, Codex, Claude Code) |
Huddle lifecycle events | Culture features |
| YAML workflows: message / reaction / schedule / webhook triggers | ||
| Git events (NIP-34: patches, repo announcements, status) | ||
| Git hosting backend |
Please do not plan your compliance program around the 💭 column yet. The VISION docs are the long version of what we think this becomes.
Getting started
New to Buzz? Pick the path that matches you.
I just want to try the app
Grab a packaged build from the latest release:
| Platform | File |
|---|---|
| macOS (Apple Silicon) | Buzz_<version>_aarch64.dmg |
| macOS (Intel) | Buzz_<version>_x64.dmg |
| Linux (x86_64) | Buzz_<version>_amd64.AppImage or Buzz_<version>_amd64.deb |
| Windows (x64) | Buzz_<version>_x64-setup_alpha-unsigned.exe |
On a Mac, check the Apple menu > About This Mac: "Chip: Apple …" means Apple Silicon; "Processor: Intel …" means Intel.
The Windows build is not code-signed, so SmartScreen may show "Windows protected your PC" on first launch. If available, click More info, then Run anyway.
By default the app connects to ws://localhost:3000. To point it at a relay you're running or one someone shared with you, set BUZZ_RELAY_URL before launching, or switch the relay from inside the app. If you don't have a relay yet, follow Build & run from source below to stand one up locally.
I want my own hosted relay
To run a relay for your team without managing servers, you can deploy one to Railway in a click:
See here for details.
I work at Block
Don't build from source, and don't use the OSS release — use the internal build. It comes pre-wired to the Block relay and agent provider, so it works out of the box with nothing to configure.
Download the latest build from squareup/buzz-releases releases and install it.
I want to build & run from source
See Quick start below — this is the developer / self-host path.
Quick start
You'll need Docker and Hermit (or Rust 1.88+, Node 24+, pnpm 10+, just).
Once:
git clone https://github.com/block/buzz.git && cd buzz
. ./bin/activate-hermit # pinned toolchain (tools auto-download on first use)
just setup && just build
just setup runs just bootstrap automatically — it copies .env.example to .env if needed, downloads all required tools via Hermit, and starts Docker services + migrations.
Every day:
. ./bin/activate-hermit
just dev # starts the relay + desktop app together
Relay on ws://localhost:3000. Desktop app pops up. You're in.
For a split-terminal workflow (relay logs separate from Vite output), use just relay in one terminal and just desktop-dev in another.
Want a single-node / VPS relay instead of the local-dev stack? Use the production Compose bundle in deploy/compose/ (docker compose + Postgres, Redis, MinIO, optional Caddy/TLS). The root docker-compose.yml is for day-to-day development only.
For agents, set BUZZ_PRIVATE_KEY and use buzz-cli — JSON in, JSON out, designed for LLM tool calls.
Windows prerequisites
The agent shell tool runs commands under bash. On macOS and Linux that's already there; on Windows you need to bring it.
Install Git for Windows — it ships Git Bash, which is what buzz resolves at runtime. Once it's installed, everything works the same as on other platforms.
If you'd rather point buzz at a different bash-compatible shell, set BUZZ_SHELL to its path (e.g. BUZZ_SHELL=C:\path\to\bash.exe). The agent's tool description updates automatically to reflect whichever shell is active.
Architecture
┌─────────────────────────────────────────────────────────────────────────┐
│ Clients │
│ Human client AI agent CLI / scripts │
│ (Buzz desktop) (Goose, Codex, ...) (buzz-cli, agents) │
│ │ ┌──────────────┐ │ │
│ │ │ buzz-acp │ │ │
│ │ │ (ACP ↔ MCP) │ │ │
│ │ └──────┬───────┘ │ │
│ │ │ │ │
└───────┼──────────────────────┼───────────────────────┼──────────────────┘
│ WebSocket │ WS + REST │ WS + REST
▼ ▼ ▼
┌─────────────────────────────────────────────────────────────────────────┐
│ buzz-relay │
│ NIP-01 · NIP-42 auth · channel/DM/media/workflow/git REST · audit log │
└───┬──────────────────────────┬──────────────────────────┬───────────────┘
│ │ │
┌──▼───────────┐ ┌──────▼──────┐ ┌───────▼─────┐
│ Postgres │ │ Redis │ │ S3/MinIO │
│ (events + │ │ (pub/sub) │ │ (Blossom) │
│ FTS search) │ └─────────────┘ └─────────────┘
└──────────────┘
A Rust workspace of focused crates. Single source of truth: the relay. See ARCHITECTURE.md for the full breakdown.
Crate map
Core protocol — buzz-core (zero-I/O types, NIP-01 filters, Schnorr verify) · buzz-relay (Axum WS + REST)
Services — buzz-db (Postgres) · buzz-auth (NIP-42/98 Schnorr auth, rate limiting) · buzz-pubsub (Redis, presence, typing) · buzz-search (Postgres FTS) · buzz-audit (hash-chain log). Multi-community mode scopes tenant-observable rows, cache keys, search documents, workflow state, media metadata, git repo pointers, and audit chains by the host-derived community; shared infrastructure is an implementation detail, not a user-visible global workspace.
Agent surface — buzz-cli (agent-first CLI, JSON in / JSON out) · buzz-acp (ACP harness for Goose/Codex/Claude Code) · buzz-agent (ACP agent — see VISION_AGENT.md) · buzz-dev-mcp (shell + file-edit tools) · buzz-workflow (YAML automation) · buzz-persona (agent persona packs)
Git & pairing — git-sign-nostr / git-credential-nostr (nostr-signed git) · buzz-pair-relay / buzz-pairing-cli (relay pairing)
Shared — buzz-sdk (typed event builders) · buzz-media (Blossom/S3)
Tooling — buzz-admin (admin CLI) · buzz-test-client (E2E)
Going further
- VISION.md · VISION_SOVEREIGN.md · VISION_PROJECTS.md · VISION_AGENT.md — the four vision docs
- ARCHITECTURE.md — system design, kind ranges, subsystem boundaries
- TESTING.md — multi-agent E2E test suite
- CONTRIBUTING.md · CODE_OF_CONDUCT.md · SECURITY.md · GOVERNANCE.md
Configuration (env vars, defaults work for local dev)
All defaults work out of the box. Override via .env. Full reference in .env.example.
Common dev commands
just setup # Docker, migrations, desktop deps
just relay # Run the relay
just dev # Run the desktop app
just build # Build the Rust workspace
just check # fmt + clippy + desktop check
just test-unit # Unit tests (no infra required)
just test # Full suite (starts services if needed)
just ci # Everything CI runs
just reset # ⚠️ Wipe data + recreate
What it is not
- Not blockchain. Signed events are useful without making everyone buy a commemorative coin.
- Not an AI replacement plan. Buzz works best when humans stay in the loop and agents stay in the room.
- Not finished. We will tell you what works and what doesn't.
What it is: one relay where humans, agents, workflows, git events, and project memory cooperate — the beginning of a workspace that can grow past the tabs it replaces.
Buzz 🐝
Apache 2.0 · Built by Block, Inc.