Persistent Agent

persist let x = y; serializes the variable to .turn_store/persist_<name>.json after every assignment. On the next boot, the Turn VM pre-loads these values automatically.

Run this script twice and observe run_count increment across restarts — zero database, zero boilerplate.

persistent_agent.tn

// Turn Language: Persistent Agent
// Run first:   turn run impl/examples/persistent_agent.tn --id my_agent
// Run second:  turn run impl/examples/persistent_agent.tn --id my_agent
// Observe: run_count increments across restarts.

call("echo", "[Persistent Agent] Booting...");

persist let run_count = 0;
persist let company = "NVDA";
persist let run_count = run_count + 1;

call("echo", "[Persistent Agent] Run #" + run_count + " - Analyzing: " + company);

let prompt = "In one sentence, assess the investment risk for " + company + ". Run #" + run_count + ".";
let analysis = infer Str { prompt; };

call("echo", "[Persistent Agent] Risk: " + analysis);
call("echo", "[Persistent Agent] State persisted. Next run: run_count = " + run_count + ".");

Run it twice to see persistence in action:

turn run impl/examples/persistent_agent.tn --id my_agent
turn run impl/examples/persistent_agent.tn --id my_agent

The full implementation is in impl/examples/persistent_agent.tn.