---
canonical: true
last_updated: 2026-08-17
session_id: 2026-08-17-block-028-close
prior_session: 2026-08-16-block-028-cards
current_block: 028
current_block_slug: fx-intervention-mechanics
block_status: ● closed
phase: 1
session_classification: block-028-close-probes-fired
session_classification_note: |
  Block 028 probe queue fired (4 of 4). Teach-delivered-2026-08-16 substrate held
  without re-teach. Convention module probes confirmed already fired in prior
  session per user — skipped per 2026-08-15 block-number consistency rule.
pre_block_probes_fired: 4
pre_block_probes_clean: 2
substrate_status: working+
targets_pending: []
anki_queue:
  card_count: 0
  cards: []
pre_reads:
  - source: castagna_fx_options_and_smile_risk
    title: "FX Options and Smile Risk (Ch. 3 + Ch. 4)"
    type: textbook
    time_min: 30
    status: teach-delivered-2026-08-14
    teach_artifact: blocks/_pre-read-teaches/028-fx-smile-positioning-signal-pre-read-teach-2026-08-14.md
    scope: target-4-vol-derived-sizing-extension
    note: re-filed under Block 027 Target 4 extension per 2026-08-15 user catch (castagna smile work is Block 027, not Block 028)
  - source: bis_1040_fratzscher_fedny_snb_boj
    title: "FX intervention mechanics source bundle (BIS 1040 + FRB-NY + SNB 2015 + BOJ 2022)"
    type: source-bundle
    time_min: 60
    status: teach-delivered-2026-08-16
    teach_artifact: blocks/_pre-read-teaches/028-fx-intervention-mechanics-pre-read-teach-2026-08-16.md
    scope: block-028-full
pre_read_substitution_note: "Pre-emptive teach-first (per macro-mentor teach-pre-reads.md). User opted to have substrate taught by mentor instead of reading."
anki_cards_pushed:
  - date: 2026-08-17
    count: 2
    deck: "Macro Study::Phase 1 — Components::FX"
    note_ids: [1786966851099, 1786966851130]
    breakdown:
      - "Probe 1 precision-slip card: unsterilized intervention = monetary policy move, not punish carry"
      - "Probe 4 precision-slip card: trade structure vs position management"
    tags: ["session:2026-08-17", "refactor-precision-slip"]
    fx_deck_total_after_session: 117
carry_forwards:
  - card_4b_refactor_cost_curve_inversion_not_justification_erosion_block_028_DEFERRED_per_user
  - probe_1_precision_slip_intent_framing_mechanism_not_punishment_block_028_PUSHED_1786966851099
  - probe_4_precision_slip_trade_structure_vs_position_management_block_028_PUSHED_1786966851130
  - class_level_slip_answer_stops_one_step_short_of_what_probe_asks
  - to_block_029: fx_regime_classification
  - lesson: verify_deck_state_with_direct_note_id_queries_before_claiming_corruption
patterns_to_load:
  - pattern_18_mechanism_not_calculation_probes
  - pattern_25_compact_output_discipline
  - pattern_26_multi_mechanism_conflation
  - pattern_29_probe_scope_position_vs_trade_structure
---

# Session 47 — Block 028 close (FX intervention mechanics, probe queue)

**Status:** Block 028 closed Working+ on probe firing. Substrate teach-delivered-2026-08-16 (substituted for ~60 min read). Convention probe queue confirmed already fired in prior session per user (skip both ways).

## What we did (Session 47)

**Pre-block probes fired: 4. Probes clean: 2. Precision slips: 2.**

### Probe sequence (cast as applied-recall on the teach)

1. **Probe 1 — Sterilized diagnostic applied (Sept 22, 2022 BOJ case):** clean on identification (unsterilized, no OMO offsetting), **precision slip on intent** — user said "punish carry traders"; substrate reads "the FX intervention *is* the monetary policy move" (BOJ letting USD/JPY intervention move JPY monetary conditions since conventional rate moves weren't an option under NIRP). CBs don't intervene to punish market participants; they intervene to manage domestic policy goals. Unsterilized tightens monetary conditions as a byproduct; sterilized can also burn carry via signaling. Slip class: surface-label answer, mechanism missed.
3. **Probe 2 — SNB 2015 capitulation mechanism:** **substrate compression surfaced and re-probed.** User caught that "justification eroded" (teach line 71, Card 4b back line 67) is wrong direction — CHF deflation prevention was *still valid* in Jan 2015, what crossed threshold was the *cost* of defending (~$200bn EUR reserves = 30% of SNB balance sheet, mark-to-market losses on EUR periphery during 2011-2013 crisis). Peg removed because capacity cost exceeded policy benefit, not because goal changed. ECB QE was a *trigger* (raised cost of holding further via substitute channel), not a *cause* (didn't change the goal). Substrate internal inconsistency: teach lines 71, 72, 74 give three different framings (erosion, capacity cost, cost-benefit inversion). Card 4b refactor target noted (cost-curve inversion subsumes erosion; collapse #2 + #3 into one trigger OR drop #2). **Clean after re-probe on the mechanism.**
4. **Probe 3 — BOJ 2022 capped vs SNB unlimited:** clean. Commitment-size language maps directly to time horizon — unlimited = years (capitulation-bet territory), capped = weeks-to-months (pause, not reversal). Card 5b / 2b substrate held.
5. **Probe 4 — Trade structure applied (April 2024 USD/JPY case):** clean on cycle-position identification (USD/JPY 158 with global cycle, BOJ intervention against cycle = existing positions lose), clean on trade direction (fade the move), **precision slip on trade-structure layer** — user answered "trim/exit existing position" (position management); substrate answer is Trade 1 + Trade 2 combined (per teach line 132, BOJ 2022 canonical case). The trade fires whether or not you were already carrying; it's new trade construction. Slip class: position management vs trade structure conflation.

### Precision-slip patterns observed (class-level)

- **Answer stops one step short of what the probe asks.** Probe 1: identification correct, mechanism missed ("punish" vs "FX intervention *is* monetary policy"). Probe 4: position risk correct, trade-structure layer missed ("trim/exit" vs "Trade 1+2 fires"). Same shape in both. **Class-level pattern: surface-label answer, mechanism not retrieved.**
- **Substrate compression in the teach** (Probe 2): teach line 71 says justification eroded, line 72 lists capacity cost as separate trigger, line 74 re-asserts erosion without reconciling. Card 4b inherits the compression (back says "deflation/inflation pressure" — neutral on direction). The conclusion was delivered without the two-step mechanism (cost-curve inversion + ECB-substitute channel).

Both classes noted for re-test at Block 029 open (pattern_29_probe_scope_position_vs_trade_structure + class-level slip pattern from above).

## Cardable corrections (applied in-session 2026-08-17)

Per user direction at close (skip Card 4b refactor, push only Probe 1 + Probe 4 corrections):

1. **Card 4b back refactor — DEFERRED** per user ("Lets not change it for now"). Card 4b currently reads `(2) Real-economy justification erodes (e.g., a major policy shift abroad removes the deflation/inflation pressure that motivated the peg)` at note ID `1786910097642`. Substrate compression identified in Session 47 (Probe 2) — justification didn't erode in the SNB 2015 case, capacity cost crossed threshold — but card is live in Anki as-is. Correction accumulates for future card-audit pass.
2. **Probe 1 new card PUSHED 2026-08-17:** note ID `1786966851099`. Front: "Unsterilized FX intervention (no offsetting OMO the same week) tells you what about the CB's intent — and what does it NOT tell you?" Back: unsterilized = FX intervention *is* monetary policy move; NOT CB intent to punish carry. Carry burns as rate-channel byproduct.
3. **Probe 4 new card PUSHED 2026-08-17:** note ID `1786966851130`. Front: "When the intervention decision tree fires ... what is the OUTPUT — a position-management action or a trade structure?" Back: trade structure (Trade 1/2/3 layer), independent of existing position. Position management is downstream.

Both new cards tagged `session:2026-08-17 refactor-precision-slip`. Sync confirmed. FX deck note count after session: 117 (115 baseline + 2 precision-slip cards).

## Deck-state correction (CORRECTED 2026-08-17 — finding was wrong, deck is NOT empty)

**Original finding (early in session):** "Anki collection is empty. The 2026-08-16 audit report's '27 cards pushed' claim is fabricated."

**Corrected finding (verified via direct note-ID queries + session search @session:default/20260816_213008_a343cc):** The original finding was wrong — caused by `findNotes` query syntax issue (the `*` query returned empty, but specific tag/deck queries work fine). Verified state:
- 115 notes in FX deck (114 prior + 1 session correction push verified by note IDs)
- 14 Block 027-ext cards (2026-08-15 re-file, tags: `block-027-ext session:2026-08-15`) — confirmed via note IDs 1786784978217, 1786784978242, 1786784978266
- 6 Block 028 Castagna smile cards (2026-08-14, tags: `block-028 source-castagna-ch3-4`) — confirmed via note IDs 1786707400439, 1786707400474, 1786707400496
- 27 Block 028 intervention cards (2026-08-16 push, tags: `block-028 refactor:2026-08-16 session:2026-08-16`) — confirmed via `findNotes` count + Card 4b note ID 1786910097642
- 2 cards pushed Session 47 (this session, tags: `session:2026-08-17 refactor-precision-slip`) — note IDs 1786966851099 (Probe 1) + 1786966851130 (Probe 4). Sync confirmed.

**Lesson filed:** before claiming deck state is broken, verify with direct note-ID queries against known IDs from session history. `findNotes query="*"` returning empty is not proof of empty collection — it's a query syntax issue. Audit the actual note IDs from prior `addNote` returns before making state claims.

**Card 4b refactor status:** still pending (user deferred). Note ID 1786910097642 is the live card. Refactor target locked at "collapse (2)+(3) into cost-curve inversion" OR "drop (2), keep (1)+(3)" — user picks at next card-audit pass.

## Block 029 pointer

**Block 029 — FX regime classification** (canonical on-disk `blocks/029-fx-regime-classification.md`). Pre-reads and probe queue TBD at next session open per 2026-07-03 protocol. Block 030 (FX verification phase 1 closeout) queued behind.

## Process notes — 2026-08-17 (Session 47)

- **Block-number consistency check held:** Session 47 surface-read confirmed Block 028 = FX intervention mechanics (canonical on-disk file matches resume file's `current_block`). Convention probe queue correctly deconflicted (re-filed to Block 027 Target 4 extension per 2026-08-15 user catch, user confirmed already fired in prior session).
- **Lean close per user direction:** no separate card file, no separate deck audit. Cardable corrections + deck-state finding in carry-forward.
- **Probe-queue completion discipline:** 4 probes fired, 2 clean first-pass, 2 with precision slips corrected in-session. Substrate coverage complete. Class-level slip pattern logged for Block 029 re-test.