Jev laya-th1200

Jev laya-th1200 is a Thai typed decision model for agent and tool governance. Given an operational request or long agent task context, it returns four typed signals:

• action: execute, ask_user, or reject
• needs_review: boolean-like (noul) indicating whether human review is required
• prohibited: boolean-like (noul) indicating whether the operation is strictly forbidden
• risk: ordinal operational-risk score from 0 to 4

This is a research and engineering checkpoint. It serves as an advisory signal and must not replace explicit authorization, repository policy, human approval boundaries, automated tests, or audit logging.

Model Details

• Base model: convaiinnovations/laya-multilingual
• Foundation: Laya 0.3.4
• Language: Thai (th) and bilingual English/Thai
• Decision primitives: choice (action), noul (needs_review, prohibited), and ordinal score (risk 0–4)
• Training dataset: 1,200 curated Thai governance examples (data/th_curated_1200/train.jsonl)
  • Retains the 1,080 curated cases from previous iterations
  • Adds 120 agent-context cases (th_17_agent_task_context_train.csv) covering realistic multi-clause coding agent prompts
• Evaluation splits: 100 cases each in Validation, Calibration, and Test (strictly balanced: 20 cases per risk level 0–4)
• Calibration: independent per-primitive temperatures and score threshold decoder fitted strictly on the calibration split
• Repository Checkpoint: JonusNattapong/jev-my-bro-th1200

Evaluation Results

Evaluated on the locked test set (100 cases, 400 typed decisions, 20 cases per risk level):

Key Improvements over th960

• Agent Context Robustness: Addresses false-positive prohibited spikes on routine multi-clause coding tasks containing phrases like "ผู้ใช้สั่งให้ทำแล้ว" or "ไม่มีการ push".
• 100% L4 Recall: Flawlessly catches destructive actions (force push to main, deleting shared branches, exfiltrating secrets, dropping production tables).

Runtime Deployment Architecture

In production and local agent environments (Claude Code, Antigravity, Codex), th1200 operates as part of a Hybrid Cascaded Architecture:

1. Layer 1: Deterministic Fast-Path Rules (<1ms)
   • Regex and keyword matcher in jevbro/rules.py
   • Configurable via rules.yaml / .jev/rules.yaml
   • Handles ~48% of standard traffic (pure inspections allowed, catastrophic shell commands rejected immediately)
2. Layer 2: LRU In-Memory Decision Cache (~15ms)
   • 1024-entry LRU cache in jevbro/core.py with whitespace normalization
   • Yields 140x speedups on repeated or similar tool executions
3. Layer 3: Neural Model Inference with INT8 Dynamic Quantization (~200–300ms on CPU)
   • PyTorch dynamic INT8 quantization applied to agent.model.encoder (--quantize)
   • Reduces CPU latency by ~3–5x compared to standard FP32 execution

Usage Example

import json
import torch
from laya import Agent
from jevbro.questions import default_questions

MODEL_ID = "JonusNattapong/jev-my-bro-th1200"
DEVICE = "cuda" if torch.cuda.is_available() else "cpu"
agent = Agent(MODEL_ID, device=DEVICE)

result = agent.predict(
    {"request": "รัน unit test ด้วย pytest บนเครื่อง local", "domain": "software"},
    default_questions("th"),
)
print(json.dumps(result["answers"], ensure_ascii=False, indent=2))

Limitations & Policy Gating

• Development and research data, not an exhaustive security policy.
• Always apply the outer policy gate:
  • If prohibited >= 0.5 ➔ reject
  • If needs_review >= 0.5 or action == "ask_user" or risk >= 3 ➔ prompt user for explicit review
  • Else ➔ execute