Crate jev_harness 

Jev Harness (Rust)

Zero-overhead System One decision harness and token optimizer for AI coding agents. Powered by TypeSafe AI’s Jev System One.

Provides ultra-fast micro-decisions (<500µs local, 70-300ms remote) to optimize model routing, triage test and execution failures, and protect against doomed repetitive loops.

Re-exports

pub use client::looks_like_test_success;

pub use client::JevClient;

pub use client::COMMANDCODE_API_URL;

pub use config::load_repo_config;

pub use config::load_repo_config_from;

pub use config::RepoConfig;

pub use config::DEFAULT_ABORT_THRESHOLD;

pub use config::DEFAULT_SKIP_LLM_THRESHOLD;

pub use gates::build_provider_params;

pub use gates::modulate_reasoning_effort;

pub use gates::route_model_tier;

pub use gates::should_abort_trajectory;

pub use gates::should_nudge_continuation;

pub use gates::triage_test_failure;

pub use gates::verify_step_completion;

pub use mcp::run_mcp_server;

pub use types::*;

Modules

cli

client

HTTP client and offline deterministic simulation engine for TypeSafe Jev System One.

config

Repository-local configuration loader for .jev.json.

gates

Semantic Decision Gates powered by TypeSafe Jev System One.

mcp

Model Context Protocol (MCP) Server for Jev System One (Rust runtime). Enables native tool-calling for Cursor, Claude Desktop, Antigravity IDE, Windsurf, Zed, OpenCode, Command Code, and any MCP-compliant AI agent over stdio (JSON-RPC 2.0).

types

Strongly typed data contracts for TypeSafe Jev System One.

uncertainty

E3.1 — uncertainty with guards, mirroring src/jev_harness/uncertainty.py and packages/ts/src/uncertainty.ts.