Low-Amplitude Reactivation Probe¶

Diagnostic probe — instantiates Stock-First Control Restoration

Before resuming the lever at full strength, sends a small test signal to confirm the repaired stock has actually re-coupled to it — verifying traction, not restoring output.

Repairing the stock and re-earning the lever's grip on it are two different things, and the second is easy to assume. Low-Amplitude Reactivation Probe refuses to assume it. After a repair, it applies a small, bounded test pulse on the lever and reads whether the stock has re-entered its responsive window — whether the lever→stock→outcome coupling is actually restored — before committing to a full resume. Its distinguishing idea is the deliberately low amplitude: keep the test small enough that, if coupling is still broken, almost nothing is spent or re-damaged. It is measuring traction, not chasing output; a good probe result is information, not yet a return to service.

Example¶

A farm over-pumped a well until its yield collapsed, and the aquifer beneath it (the stock) was rested for a season to recharge. Before switching the irrigation pumps (the lever) back to full draw, the operator runs a Low-Amplitude Reactivation Probe: a short, low-rate test pump while watching drawdown and how the water level recovers between pulses. If the level holds and rebounds, the aquifer has re-coupled — the lever bites again — and pumping can be staged upward. If the level plunges the way it did before, the stock isn't ready, and the probe has cost a few hours instead of another season-long collapse. The whole value is learning this cheaply, at the smallest scale, rather than discovering it at full throttle with the well already crashing.

How it works¶

Three moves distinguish it from simply switching the lever back on:

Pick an amplitude that is cheap to be wrong at. Size the test pulse so that a still-broken coupling costs little and re-injures the stock even less.
Read the response ratio, not the output. Did a small lever move produce a proportionate stock and outcome move? That proportionality is the signature of restored coupling.
Gate, then hand off. A pass opens the graduated ramp; a fail stops and routes back to repair. The probe is the first, smallest rung — and the go/no-go for the rest of the climb.

It sits precisely between "the reserve is refilled" and "the lever works again," and it tests only the second.

Tuning parameters¶

Probe amplitude — how large the test signal is. Larger reads coupling more clearly but risks re-damaging a stock that isn't ready; smaller is safer but noisier.
Success criterion — how strong a response ratio counts as "re-coupled." Strict avoids false restarts; loose risks ramping on a fragile coupling.
Dwell / recovery window — how long to watch the response, and any recovery between pulses, before judging. Longer dwells catch slow relapse; shorter ones resume sooner.
Abort rule — what response triggers an immediate stop back to repair. A tight abort protects the stock; a loose one gambles on marginal readings.

When it helps, and when it misleads¶

Its strength is that it makes the resume evidence-based and cheap-to-be-wrong: you find out whether the repair took at the smallest possible scale, before betting full output on it. It cleanly separates level ("the stock is refilled") from coupling ("the lever works again") — the two can diverge, and only a probe tests the latter.

Its failure modes mirror the amplitude dial. Too small a probe can't tell real coupling from noise, tempting a premature ramp; too large a probe can itself re-injure a stock that was only shallowly repaired. The classic misuse is treating a single good probe as license to jump straight to full strength, skipping the staged ramp the probe existed to open. The discipline is to pre-set the success criterion and abort rule, and to route a pass into a graduated ramp rather than a full resume. In control terms this is a step-response test — perturb a system with a small known step and read its response before trusting it.^[1]

How it implements the components¶

Low-Amplitude Reactivation Probe fills the verification / first-stage side of the archetype — the components that confirm coupling and begin the resume, not the ones that repair or fully restore:

coupling_probe — it is the small test application that checks whether the lever and stock have re-coupled.
staged_control_reactivation — it performs the first, lowest-amplitude rung of reactivation and gates whether the rest proceeds; the full graduated climb is carried by Staged Lever Ramp.

It does not rebuild the stock it tests (stock_repair_plan — [Replenishment-or-Refill Protocol]) or certify that the recovery is durable against relapse (hysteresis_exit_check — Hysteresis-Aware Exit Criterion); it verifies first contact, then hands off.

Instantiates: Stock-First Control Restoration — the probe is the cheap coupling check that guards the transition from repair back to control.
Consumes: Replenishment-or-Refill Protocol — the probe tests the result of the repair, so it runs only once repair has reached threshold.
Sibling mechanisms: Staged Lever Ramp · Hysteresis-Aware Exit Criterion · Gain-Collapse Test · Lever Freeze-or-Cap · Fallback Control Mode · Deleverage-Before-Stimulus Rule · Minimum Stock-Floor Alert · Replenishment-or-Refill Protocol · Substrate Repair Protocol · Stock-Flow Diagnostic Map · Trust-Repair-Before-Persuasion Rule

References¶

[1] Step-response test — applying a small, known step change to a system's input and observing the output to characterize its behavior before relying on it. The reactivation probe is a step test used to confirm that a repaired stock responds to the lever again. ↩