Struct Ctx 

pub struct Ctx<'a> {
    pub session: &'a str,
    pub check: &'a str,
    pub channel: &'static str,
    pub lessons: &'a Path,
    pub summary: &'a Summary,
    pub tokens: u32,
    pub had: &'a [String],
    pub alpha: f64,
}

The check a decision is made for.

Fields

session: &'a str

check: &'a str

The check’s id (check_id).

channel: &'static str

stop or live.

lessons: &'a Path

The lessons file the conscience reads (hook.rs lessons_path): the store whose outcomes count.

summary: &'a Summary

The selection summary loaded beside lessons (select/summary.rs load).

tokens: u32

The check’s pool tokens (shown_tokens, the graded record’s tokens); 0 unknown, the baseline’s. The fit and the gate’s ledger value the check at the logged tokens, so the learned policy decides at them too: the gain the gate admits is then the gain its ledger records.

had: &'a [String]

The lessons this session already had delivered (asked, delivered early or handed over free: hook.rs had_in over the state read at the decision, decide) or has waiting in its queue to be asked or handed over by another check (hook.rs waiting_in), in any order. Such a lesson may still be asked, but never takes a free slot (the delivery would drop it as given before or queued twice, conscience.rs graded_without), and is never a placebo (draw_placebo). Only those among the applies count (nofree, what the graded record logs), so a replay passes the record’s nofree; empty for a record from before it, whose hook decided without.

alpha: f64

The collective’s tolerance in force at the check (alpha: its risk in collectives.json, else policy::ALPHA), read once by the hook and logged on the graded record (Log::alpha), so a replay decides under the α the hook had (alpha_of the record’s), not whatever the config says for the replayed path now (a store copy maps to no collective).