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TTS fixes + hardening for the Donut voiced interview. Feature: - gibberish -> pin `language: "en-us"` on every gateway call (DEC-9); the multilingual model drifted into other-language phonemes without it. - truncation -> the Zonos model hard-caps one synthesis at 6144 tokens / 71.2s (infra-ops). Chunk client-side (paragraph-first, greedy to ~75% of cap for prosody; sentence/clause fallback) and concatenate the int16 PCM behind ONE WAV header (DEC-10). /api/tts becomes POST so a long turn rides the body, not a length-capped URL (DEC-10a). - persona -> dialogue-only rewrite (no asterisk RP beats -- they were being voiced as gibberish) + always consult the native `reference_knowledge` tool before answering (retires the stale kb_bridge references). Pushed live to ratatoskr:donut. Heid code-review + bug-hunt hardening (4-arm panels, triaged): - untrusted /api/tts body fields degrade, never 500: huge-int PAD (OverflowError), non-str agent_id (unhashable .get), lone surrogates (utf-8 encode), whitespace-only text. - serialize lock + client released on every peek escape (cancel / InvalidURL) -- previously a permanent deadlock. - a mid-stream drop after a committed 200 degrades (keeps what played), never raises into the response; a non-WAV 200 body is rejected (RIFF sniff + bounded header scan) instead of decoded as garbage. 546 tests green; long-form live-verified (106.6s, one header). Contract brought canonical (DEC-9/10, FN chunk_text/tts_stream_long, POST endpoint, INV-TTS-4 logging scope, FN pad_to_dials domain). reference_knowledge empty-recall root-caused to a Worldtree wing-misfile (escalated to worldtree-dev; not ratatoskr code).
Ratatoskr
A Worldtree Conversation API debug console. Runs up and down Worldtree's API surface — sessions, turns, persona, tools, admin events, Bifrost state — carrying messages between layers. Like the squirrel.
The product is the observability surface; chat is the input mechanism.
Devs run Ratatoskr against a local Worldtree to watch a turn flow through
every layer of the system, side-by-side. The interactive surface is the
web console (ratatoskr-web); a headless --send CLI drives scripted smokes.
Status
v0 scaffold. Design locked; implementation hasn't started. The dev team owns the implementation pass.
Read in this order
docs/design-brief.md— the locked design. Read this first. Every architectural decision is recorded with its rationale, the alternatives considered, and (where relevant) the operator's lock-in moment.docs/SPEC-PIN.md— what Worldtree spec version Ratatoskr is built against, where the vendored snapshot lives, and how to bump the pin.docs/conversation-api-spec.md— the vendored Worldtree spec snapshot. Read this to understand the API surface Ratatoskr consumes. Do not import anything from a Worldtree checkout — the boundary is the spec, not the code. Seedocs/design-brief.md§2.CLAUDE.md— Claude Code conventions for this repo (mostly inherited from the Corviduo template).persistent-memory.md— durable intent across context resets. Update as decisions and state evolve.
Quickstart
# 1. Environment
uv venv && source .venv/bin/activate
uv pip install -e ".[dev]"
# 2. Verify the spec pin
cat docs/SPEC-PIN.md # documented Worldtree SHA + bump procedure
# 3. Tests (none yet; scaffold only)
uv run pytest
# 4. Run against a local Worldtree (Worldtree must be running)
# Interactive web console:
ratatoskr-web --host 0.0.0.0 --port 8765
# Headless CLI (scripted smoke):
ratatoskr --send "hello" --new --agent mimir --api-key "$WORLDTREE_API_KEY"
What this repo is NOT
- NOT a polished consumer for Worldtree's end-users — that's the web app.
- NOT a Worldtree admin tool — admin CLI is separate (
sessions_cli.pylives in Worldtree). - NOT a featuretracking shadow of the web app — when the Conversation API surface grows, Ratatoskr does not necessarily grow with it.
- NOT a remote-Worldtree debug client — file-tail surfaces (persona log, server log) assume local-dev posture.
The full negative-clause list lives in docs/design-brief.md §6.
Boundary rule
Ratatoskr depends on a small, fixed surface:
httpx+httpx-sse(network layer)starlette+uvicorn(the web console; thewebextra)- Worldtree's published Conversation API spec at the pinned SHA
Hard rule: no imports from a Worldtree checkout. No core.* imports,
no from worldtree.*, no shared models, no submodule of Worldtree. The
spec is the entire surface. Boundary smoke test at tests/test_no_worldtree_imports.py
enforces this in CI.
Version-skew strategy
The dev team is decoupled from Worldtree's dev team. To detect drift when Worldtree changes the API:
- Spec-version pin in
pyproject.toml(worldtree-spec-rev). Bump explicitly; bumps are a tracked action. - Recorded-SSE snapshot tests at
tests/snapshots/. Captured against a live Worldtree; replayed in CI. Re-record after every pin bump. - Conformance smoke test — boots Worldtree via Docker compose in CI, runs a one-turn happy path. Catches integration-level drift.
See docs/SPEC-PIN.md for the bump procedure.
Consumer-side discoveries
If you find a spec gap, ambiguity, or missing-but-needed endpoint while working on Ratatoskr: route the discovery back to worldtree-dev via althing rather than via PR on Worldtree directly. The separate-team boundary is intentional and helps catch spec gaps that an in-tree consumer would paper over.
Related repos
- Worldtree — the API Ratatoskr consumes
- brokkr-smithy — authored this design brief
- Skaldsong — another Worldtree API consumer (Python; render-and-aggregate pattern)
- mead-hall — another Worldtree API consumer (TypeScript; server-side broker)