src/config.rs

This file carries your session-scoped settings, the ones that stay stable across runs on one agent. SessionConfig is where you declare them.

Key items

SessionConfig { system_prompt: Option<String>, context_window: u64, compact_threshold: u8, auto_compact: bool } is the whole struct.

Defaults are None, 200,000, 80, and true.

Your builders are with_system_prompt, with_context_window, with_compact_threshold which clamps 0 to 100, and with_auto_compact.

The window you set is the declared window. A client disclosure from model_context_window() outranks it at run start since 0.4.0, and 0 is the deliberate opt-out that beats any disclosure.

ParallelMode { Sequential, Parallel } and ParallelDispatchConfig { mode, max_concurrency } default to Sequential and 8, clamped to [1, batch size] at dispatch.

Behavior notes

Your threshold comparison in the machine is strict, using >, while the emergency line at 95% is inclusive with >= and always on.

Set compact_threshold: 0 to disable the threshold trigger, and context_window: 0 to disable all window policy.

Serde deserialization clamps out-of-range thresholds to 100, so it won’t round-trip the original number, while direct struct construction bypasses clamping entirely. Prefer builders.

max_turns is not here. It is per-run, on RunConfig.

Deep dive: Session config.