What it is
A Go CLI and single-binary MCP server, evaluate, that lets Claude Code, Claude Desktop, Codex and pi call TypeSafe's Jev model and get back probabilities they can branch on.
How it uses Jev
The agent calls the evaluate tool with state plus typed questions; evaluate POSTs to TypeSafe /v1/systemone (or OpenRouter /decisions) and returns raw JSON, each answer under the id given. Rate-limit and API errors are retried or surfaced as tool errors.
Primitives:choicescorenoul
Technique worth stealing
Batch independent typed questions over one state in a single call; they run in parallel, so the agent branches on probabilities instead of parsing prose.
Try it
curl -fsSL https://raw.githubusercontent.com/itsmostafa/typesafe-mcp/main/install.sh | sh, then TYPESAFE_API_KEY=your-key evaluate setup mcp.
Evidence
Each line is one question put to Jev about the README. ≥ 0.60 reads as yes, ≤ 0.40 as no; in between Jev is not making a call.
- Jev-centricyes0.93
- Shows a System One patternno0.31
- Handles uncertaintyno0.06
- Measuredno0.05
- Runnableyes0.98
- Worth recommendingno0.22
- Model replicano0.03
- Problem scopescore on a 0–2 scale1.03
- About Jevyes0.98
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 20 Sept 2026.