spark-control/AGENTS.md

# AGENTS.md

This file provides guidance to coding agents (Claude Code and others) when working with code in this repository. (Claude Code reads it via the `CLAUDE.md` symlink.)

Browser-based StartOS 0.4 package controlling a dual NVIDIA DGX Spark AI cluster: one-click vLLM model swaps, plus health, proxying, and APIs for speech (STT/diarization/TTS), embeddings, and redaction.

Subsystem guidance lives in `docs/guides/` and loads when matching files are touched (Claude Code lazy-loads via `.claude/rules/` symlinks; other agents read the guides directly): `startos-package.md` (build/versioning, `package/**`), `fastapi-image.md` (dev server/env/layout, `image/**`), `redaction.md` (vendoring + test gates), `audio-speech.md` (parakeet patches, cluster-container footguns, audio testing). **Read `docs/guides/audio-speech.md` before touching the Sparks' containers over SSH** — ops sessions don't trip the path scoping.

> **Inbox check:** At session start, if `~/Projects/standards/INBOX.md` exists, scan it for
> items tagged `(spark-control)` and surface them before proposing next steps; triage with `/triage`.

## Stack

- Two halves, always coordinated:
  - `image/` — standalone FastAPI app (Python ≥3.11; UI on port 9999; vanilla HTML/CSS/JS).
  - `package/` — StartOS 0.4 wrapper (TypeScript) that ships the Docker image as an s9pk.
- Build host needs `start-cli`, Node ≥22 + npm, and Docker.
- Cluster runtimes live **on the Sparks, not in this repo** (`spark-vllm-docker`, the parakeet/kokoro/embeddings containers). This repo is the controller; it reaches them over SSH + HTTP.
- Sparks are ARM64 (GB10 Grace-Blackwell, sm_121, CUDA 13). Services: vLLM `:8888` (Spark 1); `parakeet-asr` `:8000`, Kokoro TTS `:8880`, bge-m3 embeddings + Qdrant (Spark 2). See `docs/` for API contracts.

## Commands (headlines — details in the scoped rules)

```bash
(cd package && make x86)                                  # build the s9pk; make install sideloads (restarts live service — ask first)
(cd image && uvicorn app.server:app --port 9999)          # local dev — needs env vars, see fastapi-image rule
(cd image && .venv/bin/python -m pytest)                          # offline unit suite (launch-cmd injection, label-merge)
(cd image && .venv/bin/python -m app.redaction.test_gateway)      # offline redaction suite 1
(cd image && .venv/bin/python app/redaction/test_scrub_leak.py)   # offline redaction suite 2
./scripts/test-audio-with-speakers.sh <audio-file>        # e2e audio — hits the LIVE cluster
```

## Layout

- `image/app/` — FastAPI app (`server.py` entry, routers in sibling modules, `static/` dashboard UI).
- `package/startos/` — StartOS manifest, interfaces, actions, version + release notes.
- `docs/` — `AUDIO_API.md`, `EMBEDDINGS.md`, `REDACTION_GATEWAY.md` (consumer-facing API refs; update with API changes).
- `README.md` (overview), `HANDOFF.md` (fresh-user install guide), `runbook.md` (ops notes), `known-issues.md`, `ROADMAP.md` (longer-term backlog — items move into "Current state" below when picked up).

## Conventions

- Every shipped change = version bump + release notes + rebuilt s9pk (version format `X.Y.Z:N`; details in the startos-package rule).
- Commit messages: `vX.Y.Z:N - short lowercase summary`. **Never add a Co-Authored-By / Claude attribution trailer.**
- The package owner is non-technical: explain infra effects in plain English and get an explicit go/no-go before mutating the cluster.
- New external-facing endpoints get documented in `docs/` and noted in release notes for downstream app developers (Recap Relay, Ten31 Transcripts, CRM, Signal Engine consume these APIs).
- Doc layout: `AGENTS.md` is the canonical file; `CLAUDE.md` is a symlink to it (don't overwrite it). Subsystem guides are real files in `docs/guides/<topic>.md` (with `paths:` frontmatter); `.claude/rules/<topic>.md` are relative symlinks into them. A new guide = add `docs/guides/<topic>.md`, symlink it from `.claude/rules/`, and add an index line above.

## Always / Never (cluster-wide)

- **Always** confirm with the user before swap/stop/restart of anything on the live cluster. Read-only probes and dry-runs are fine without asking.
- **Always** use the Spark's **IP** for HTTP probes — `.local` mDNS names can resolve IPv6-first and hang httpx (vLLM and friends bind IPv4 only). Never trust `.local` hostnames inside HTTP client code.
- **Always** pass `SSH_KEY_PATH` / `-i <key>` explicitly in scripted SSH; non-interactive shells have no ssh-agent identities.
- **Never** route audio or transcripts to cloud services — speech stays on the LAN. (Scrubbed text via `/scrub` is the only sanctioned path toward frontier models.)
- **Never** commit owner-specific hostnames, IPs, usernames, or names into package strings, UI text, or docs — this package gets shared; use placeholders. Canonical set: `<spark-1-ip>` / `<spark-2-ip>`, `<spark-1-host>` / `<spark-2-host>`, `<spark-user>`, and generic example names (`Alice`/`Bob`).
- **Never** install `cuda-python` in `parakeet-asr` — crashes real decode on this GPU/CUDA-13 stack; full story in the audio-speech rule.

## Current state

- **Working (v0.20.0:0, installed and serving):** swap dashboard; chat / transcribe / diarize(+chunk) / TTS proxies; embeddings + rerank + hybrid search (Qdrant); `/scrub` + `/rehydrate`; label-merge incl. dual-channel; per-Spark SSH-key copy + WireGuard `VPN <ip>` hardware-card badge. Spark 2 audio stack healthy. Security hardening (v0.19.0:0 — shellsafe SSH-injection guard, Qdrant path-injection, same-origin CSRF guard) shipped and stable; evidence in `EVALUATION.md`.
- **Tests:** offline pytest harness in `image/tests/` — `cd image && .venv/bin/python -m pytest` (65 passing). Covers `build_launch_command` (incl. the shell-injection round-trip), the transcript↔diarizer label-merge, and the `shellsafe` validators. Mock-heavy swap/proxy tests deliberately skipped (low ROI). Redaction + live-audio suites remain standalone scripts.
- **Signal Engine "flakiness":** diagnosed as *not* a server bug — transient 1–4s unresponsiveness while the single GPU is busy. Client-side remedy (in-flight cap 2 / ceiling 3 / retry-on-timeout+503) drafted and **forwarded to that dev (owner confirmed 2026-06-15)**. Awaiting whether they want the measured concurrency knee.
- **Stance (decided, not built):** no public interface / no API-token auth — LAN + WireGuard/Tailscale split-tunnel only; the CSRF guard covers the browser-driven vector.
- **Known limits:** `/health` blips while the GPU is busy (mitigated client-side); dual-channel can miss a quiet local word under loud remote bleed; connectivity log misses sub-5s outages between 5s polls; diarizer caps at 4 speakers.
- **Infra gotcha (safety):** passwordless sudo is NOT configured on spark2 — design unprivileged probes for any Spark feature (the badge uses `ip`, not `sudo wg show`). spark2 sits on the `starttunnel` WireGuard subnet (`10.59.211.6/24`, survives reboot). Owner declined SSH-key rotation after the 2026-06-12 history scrub (only the key *name* leaked) — don't re-flag.
- **Hosting:** self-hosted Gitea — remote `gitea`, branch `master`, over SSH; push after committing. (Wart: commit `8d839e3` is mislabeled `v0.13.0:4` but contains through v0.18.0:0.)
- **Next:** (1) audio concurrency sweep — only if the Signal Engine dev wants the measured knee; needs owner OK in a quiet window. (2) Otherwise pull from `ROADMAP.md`: local-path/fine-tuned model support (new) or P2 tech-debt. Parakeet long-audio guard is deferred (rationale in ROADMAP).