Praxis CI 37f5cd4587 feat(P01-05-01,P01-05-02,P01-05-03): coaching debrief + guardrail filter + TTS voice
server/debrief.py — generate_debrief() loads the session turns + branch
outcome + scenario debrief.debrief_focus, calls deepseek-v4-flash:cloud in
no_think mode (D-020, REQ-LLM-02) with the debrief prompt template
(docs/debrief/default.yaml), produces a concise 3-bullet text summary
(what you did well / what to improve / one next step) referencing the
learner's actual turns + branch outcome.

TASK-05-02: the debrief text is routed through the CustomerServiceGuardrail
output filter (debrief role) — legal-action recommendations are blocked and
replaced with a coaching redirect.

TASK-05-03: the debrief is synthesized via the same TTSProvider interface
as the role-play (D-006 one voice) — no separate TTS path (verified by
structural test).

5 tests pass (debrief references turns + branch, no_think mode asserted,
guardrail blocks 'tell the customer to sue', normal coaching passes,
TTSProvider synthesis reuses role-play voice).

---ci---
phase: 1
milestone: v0.1
plan: 05
task: 05-01,05-02,05-03
status: execute
persona: backend-engineer
requirements:
  covered: [REQ-DEBRIEF-01, REQ-LLM-02, REQ-NFR-SAFE-01]
---/ci---
2026-08-01 13:16:38 +00:00

Praxis — v0.1 Foundation

Voice-first AI apprenticeship platform. v0.1 is a tech-validation harness (per G-008) for the minimal viable voice loop: a single learner speaks to an AI tutor playing a Customer Service role-play scenario, hears a <600ms-latency response, receives an end-of-session coaching debrief, and has the session logged to SQLite.

Status

Phase 1 (minimal viable voice loop) — code-complete, pending live API keys for runtime verification.

Stack

  • Orchestration: Pipecat (D-017) with Silero VAD + interruptibility
  • ASR: Deepgram Nova-3 streaming (D-013)
  • LLM: Ollama Cloud direct API (D-020) — gemma4:cloud (role-play) + deepseek-v4-flash:cloud no-think (debrief)
  • TTS: Cartesia Sonic (primary, D-014) / Piper (self-hosted, R4 mitigation) — behind an interface
  • Client: React + Vite + WebRTC (Pipecat client SDK, D-015)
  • State: SQLite praxis.db (D-007, single hardcoded learner, no auth)

Layout

server/      Pipecat pipeline, services (TTS/LLM/Guardrail interfaces), scenario runtime, adapters
client/      React + Vite + WebRTC learner surface
scenarios/   YAML scenario definitions (D-018)
db/          SQLite schema, migrations, async store
scripts/     Latency probes (R1-R4), e2e smoke
tests/       Unit + e2e
docs/        Latency report, debrief templates

Quickstart

  1. Copy .env.example.env, fill in DEEPGRAM_API_KEY, CARTESIA_API_KEY, OLLAMA_API_KEY.
  2. Install server deps: pip install -e ".[dev]"
  3. Install client deps: cd client && npm install
  4. Run probes: python scripts/probe_deepgram.py (etc.)
  5. Run server: python -m server
  6. Run client: cd client && npm run dev

See docs/latency-report.md for the R1-R4 spike status and TTS decision.

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