354 lines
17 KiB
Markdown
354 lines
17 KiB
Markdown
# Experiment 60B.65 — Decision-sufficiency module boundary audit
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**Branch:** `feature-decision-closure-integration-v0.43`
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**Status:** audit only, zero production changes
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**Date:** 2026-08-14
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---
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## Pre-check
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```text
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branch = feature-decision-closure-integration-v0.43 ✓
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working tree = clean ✓
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HEAD includes bce05f7 ✓
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```
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---
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## LINE FOOTPRINT (lib/graph/apply-proposal.js)
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### Confirmation helper
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**Lines:** 61–117 (total), 63–85 constants + 96–117 function body
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- Header comment: line 61 (1 line)
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- `CONTRADICTION_PHRASES`: lines 63–66 (4 lines)
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- `CONFIRMATION_PHRASES`: lines 69–80 (12 lines)
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- `CONFIRMATION_PATTERNS`: lines 82–85 (4 lines)
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- JSDoc for `isUserConfirmationOfNoRemainingUncertainty`: lines 87–95 (9 lines)
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- Function `isUserConfirmationOfNoRemainingUncertainty`: lines 96–117 (22 lines)
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**Approx count:** ~47 production lines (constants + function body, excl. header comment)
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### Remaining-factor helpers
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**Lines:** 4615–4730 (total)
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- Comment header: line 4615 (1 line)
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- `TERMINAL_STATUSES`: line 4617 (1 line)
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- `isUnresolvedUnknown`: lines 4619–4623 (5 lines)
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- `hasRemainingMaterialFactors`: lines 4625–4627 (3 lines, thin wrapper)
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- JSDoc + `countRemainingMaterialFactors`: lines 4629–4729 (101 lines incl. JSDoc)
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**Approx count:** ~110 production lines
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### Closure integration block (inside applyValidatedProposal)
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**Lines:** 3835–3984 (within function)
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- Comment header: line 3835 (1 line)
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- `pendingResolvedIds` + virtual helper setup: lines 3843–3853 (~11 lines)
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- `checkRemainingFactorsVirtual`: lines 3855–3942 (88 lines — **duplicates** graph traversal from countRemainingMaterialFactors)
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- Parent-node iteration + closure predicate application: lines 3945–3983 (~39 lines)
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**Approx count:** ~149 production lines
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### Supporting additions (60B.64-specific)
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- `TERMINAL_STATUSES` at line 4617: 1 line (shared between remaining-factor detection and closure virtual helper)
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### Total decision-sufficiency production lines in apply-proposal.js
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```text
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Confirmation constants + function: ~57
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Remaining-factor helpers: ~111
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Closure integration block: ~150
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─────────────────────────────────────────────
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Total in apply-proposal.js: ~318
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```
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Of these, **~149 lines are the closure integration block** (the bulk of the 210-line addition cited for 60B.64). The remaining ~70 lines are helper functions/constants that support it.
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---
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## RESPONSIBILITIES
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### Confirmation helper (`isUserConfirmationOfNoRemainingUncertainty`)
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- **Classification:** TEXT CONFIRMATION
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- Pure text-predicate on raw user answer string
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- Zero graph access, zero side effects
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### Remaining-factor helpers
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- `isUnresolvedUnknown`: **GRAPH QUERY** (simple status check)
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- `hasRemainingMaterialFactors`: **GRAPH QUERY** (thin boolean wrapper)
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- `countRemainingMaterialFactors`: **GRAPH QUERY** (complex traversal across 4 routes)
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### Closure integration block responsibilities
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The block performs **three distinct** responsibilities:
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1. **Virtual resolution set construction** — builds `pendingResolvedIds` from `proposalSnapshot.resolvedUnknownNodeIds` and `proposalSnapshot.updatedNodes`
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2. **Decision sufficiency evaluation** — calls `checkRemainingFactorsVirtual` + `isUserConfirmationOfNoRemainingUncertainty` to produce a boolean predicate
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3. **Graph mutation** — sets `parentNode.status = "resolved"`, calls `ensureResolvedUnknownId`, upserts `proposalSnapshot.updatedNodes`
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### Mixed responsibilities present?
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**YES.** The closure integration block mixes:
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- Decision sufficiency *evaluation* (responsibility 2) with graph *mutation* (responsibility 3).
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- The virtual factor-counting function (`checkRemainingFactorsVirtual`) is also a duplicate of the pure `countRemainingMaterialFactors` from 60B.61, creating **intra-file duplication** of ~55 lines of traversal logic.
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---
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## DATA DEPENDENCIES
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### Confirmation helper
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**Needs:**
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- `answer` (raw user answer string) — from applyValidatedProposal argument
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**Accidental coupling:** NONE
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- Pure function with single input, zero graph access
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### Remaining-factor detection (`countRemainingMaterialFactors`)
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**Needs:**
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- `decisionNodeId` (string)
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- `graph.nodes`, `graph.edges`
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- `TERMINAL_STATUSES` constant (internal to same module)
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**Accidental coupling:** NONE
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- Pure function with two explicit parameters; all logic is internal
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### Closure application (integration block)
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**Needs:**
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- `parentNode` — from iteration over `updatedSituationGraph.nodes`
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- `answer` — for confirmation check
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- `proposalSnapshot` — to read `resolvedUnknownNodeIds`, `updatedNodes`; to mutate status entries
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- `updatedSituationGraph.nodes/edges` — to build nodesById map (duplicates what countRemainingMaterialFactors already does)
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**Accidental coupling:**
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- **LOW.** Reads from `proposalSnapshot` and `updatedSituationGraph` which are natural outputs of the preceding decomposition → propagation stages. These are essential flow-throughs, not deep-local coupling.
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- The **virtual helper** duplicates the graph traversal from `countRemainingMaterialFactors`, reading nodes/edges that the pure function already accepts as parameters. This is *latent* duplication rather than accidental coupling per se — it exists because the block chooses to re-implement rather than reuse.
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---
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## HIDDEN COUPLING AUDIT
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| Local variable in applyValidatedProposal | Dependency type |
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|---|---|
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| `proposalSnapshot` | **PASSABLE ARGUMENT** — could be passed to a predicate |
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| `updatedSituationGraph` | **PASSABLE ARGUMENT** — same as graph parameter to pure function |
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| `reasoningState` | NOT used by closure block |
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| `deterministicSelection` | NOT used BY closure (but read AFTER if closureApplied=true) |
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| `resolvedUnknownNodeIds` | PART of `proposalSnapshot`; not accessed directly |
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| `validatedProposal` | NOT used by closure block |
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| `answer` | **PASSABLE ARGUMENT** — single string, already extracted in confirmation helper |
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No deep/local-variable coupling discovered. The closure block's dependencies are all at the function's parameter/early-boundary level.
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---
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## CANDIDATE ASSESSMENT
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### Candidate A — NO EXTRACTION
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- **Semantic-change risk:** N/A (no change)
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- **Coupling reduction:** NONE
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- **Testability improvement:** NONE (tests already exist but in large file)
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- **Complexity reduction:** NONE (~318 lines of decision-sufficiency code still mixed in 4730-line file)
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- **Schema change:** NO
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- **Principal weakness:** The virtual helper duplicates `countRemainingMaterialFactors`. Two independent implementations of the same graph traversal logic create maintenance risk.
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### Candidate B — EXTRACT GRAPH QUERY ONLY
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Extract `isUnresolvedUnknown`, `hasRemainingMaterialFactors`, `countRemainingMaterialFactors` → `decision-sufficiency.js`
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- **Semantic-change risk:** LOW (all three are pure functions already exported)
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- **Coupling reduction:** MEDIUM (removes ~111 lines from apply-proposal.js; eliminates one duplication source by enabling reuse)
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- **Testability improvement:** MEDIUM (pure graph queries become importable test fixtures)
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- **Complexity reduction:** MEDIUM (~111 fewer lines in apply-proposal.js)
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- **Schema change:** NO
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- **Principal weakness:** The virtual helper inside the closure block still duplicates traversal logic. It would need to be rewritten to call `countRemainingMaterialFactors` with a custom "unresolved predicate" parameter, or the extracted module would need to accept such a parameter — introducing a new signature variant that complicates the extraction.
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### Candidate C — EXTRACT QUERY + CONFIRMATION
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Add `isUserConfirmationOfNoRemainingUncertainty`, `hasRemainingMaterialFactors`, `countRemainingMaterialFactors` → `decision-sufficiency.js`
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- **Semantic-change risk:** LOW (all pure, zero state dependency)
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- **Coupling reduction:** HIGH (removes all decision-sufficiency *evaluation* from apply-proposal.js; ~167 lines)
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- **Testability improvement:** HIGH (confirmation detection becomes independently testable)
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- **Complexity reduction:** MEDIUM (~167 fewer lines in apply-proposal.js; closure block reduced to orchestration/mutation only)
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- **Schema change:** NO
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- **Principal weakness:** The closure integration block's virtual helper still exists and duplicates graph traversal. It must be eliminated or rewritten.
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### Candidate D — EXTRACT PURE DECISION-SUFFICIENCY UNIT ★ RECOMMENDED
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Extract all three functions + a combined predicate:
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```js
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// decision-sufficiency.js exports:
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isUserConfirmationOfNoRemainingUncertainty(answer) -> boolean
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hasRemainingMaterialFactors(decisionNodeId, graph) -> boolean
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countRemainingMaterialFactors(decisionNodeId, graph) -> number
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shouldCloseDecision({ decisionNodeId, graph, answer }) -> boolean
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```
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Keep in apply-proposal.js only:
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- The confirmation constants (or move them to the new module too)
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- `TERMINAL_STATUSES` (or move it — see below)
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- The closure *mutation* block that applies parentNode.status = "resolved"
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- **Semantic-change risk:** LOW (pure functions extracted; apply-proposal.js becomes a thin consumer of a predicate result)
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- **Coupling reduction:** HIGH (all evaluation moves to dedicated module; only orchestration/mutation stays)
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- **Testability improvement:** HIGH (`shouldCloseDecision` is the clearest possible unit test target — 3 inputs, 1 boolean output, zero graph access needed in tests)
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- **Complexity reduction:** HIGH (~210 fewer lines in apply-proposal.js for evaluation; closure block reduced to ~40 mutation lines)
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- **Schema change:** NO (existing `hasRemainingMaterialFactors` and `isUserConfirmationOfNoRemainingUncertainty` already exported — no public API change)
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- **Principal weakness:** Requires adding a new `shouldCloseDecision` predicate that doesn't exist today. This is the only "new function" introduced, but it's derived directly from the existing inline code (lines 3952–3955).
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### Candidate E — EXTRACT QUERY + MUTATION
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Move both evaluation AND graph mutation to a new module.
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- **Semantic-change risk:** HIGH (breaks apply-proposal.js's ownership of all graph mutations)
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- **Coupling reduction:** MEDIUM (evaluation isolated but now also outside apply-proposal.js)
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- **Testability improvement:** MEDIUM (mutation tests require graph state setup in every test)
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- **Complexity reduction:** LOW-MEDIUM (apply-proposal.js loses mutation code but also loses visibility into the full lifecycle)
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- **Schema change:** YES or NO depending on whether mutation is applied inside apply-proposal or returned as a diff — either way requires interface change
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- **Principal weakness:** Violates principle #4 ("graph mutation ownership stays in apply-proposal"). Introduces dual-mutation-source risk. The extracted module would need to be aware of `applyValidatedProposal`'s post-closure flow (`deterministicSelection`, selectedQuestion) to avoid orphaned state.
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---
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## PURE-FUNCTION BOUNDARY
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**Pure-function boundary possible:** YES
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**Recommended shape:**
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```js
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shouldCloseDecision({
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decisionNodeId, // string — the unknown node ID being evaluated for closure
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graph, // SituationGraph — post-propagation graph state
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answer // string — raw user answer (not processed/normalized)
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}) -> boolean
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```
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**Why:**
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- All three inputs are naturally available at the point where the closure block runs.
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- The existing `isUserConfirmationOfNoRemainingUncertainty` already accepts a single `answer` parameter and is pure.
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- The existing `countRemainingMaterialFactors` already accepts `(decisionNodeId, graph)` and is pure.
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- The predicate is simply: `countRemainingMaterialFactors(decisionNodeId, graph) === 0 && isUserConfirmationOfNoRemainingUncertainty(answer)`.
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- No mutation, no question selection, no state change — all within the strict purity constraints listed in the prompt.
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---
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## ORCHESTRATION BOUNDARY
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**Minimum code remaining in applyValidatedProposal after extraction:**
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```js
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// Lines ~15-20 would remain:
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const sufficiency = shouldCloseDecision({
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decisionNodeId: parentNode.id,
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graph: updatedSituationGraph,
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answer,
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});
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if (sufficiency) {
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// mutation only:
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parentNode.status = "resolved";
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ensureResolvedUnknownId(proposalSnapshot, parentNode.id);
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upsertUpdateInSnapshot(proposalSnapshot, parentNode.id, ...);
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closureApplied = true;
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}
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```
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**Approximate orchestration lines after extraction:** ~40 lines
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(reduced from ~150 lines currently)
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The remaining code is purely:
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1. Iterate parent unknown nodes
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2. Call external predicate
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3. Apply mutation if predicate returns true
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4. Mark `closureApplied = true`
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---
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## TEST MIGRATION
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**60B.61 tests movable:** YES
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- 9 test cases (lines 5012–5364, ~353 lines)
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- All test `hasRemainingMaterialFactors` which is a pure function
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- Could be extracted to `tests/graph/decision-sufficiency.test.js` without assertion changes
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**Confirmation tests movable:** PARTIAL
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- 8 tests in "60B.64 — explicit decision sufficiency closure" (lines 5367–5784)
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- These test the *full integration* of confirmation + remaining-factor evaluation + mutation
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- The confirmation helper's individual behaviour is tested indirectly through these integration tests
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- Could extract ~120 lines of confirmation-only subtests to a separate file, but the fixtures (makeClosureDecisionFixture) are shared
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**60B.64 full integration tests should remain in apply-proposal.test.js:** YES
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- These test the end-to-end flow: applyValidatedProposal → closure mutation → downstream state effects
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- Any extraction must preserve these assertions exactly as they stand
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---
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## RUNTIME / TOOLING
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**Would splitting this logic into modules materially improve runtime performance:** NEGLIGIBLE
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- No computational complexity change; same function calls, same object allocations
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- Possibly microscopically slower due to module import overhead (unobservable in practice)
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**Would it improve Claude/Codex edit reliability:** LIKELY YES
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- Decision-sufficiency logic would live in a ~150-line file instead of being scattered across a 4730-line file
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- Future edits to the confirmation phrases, factor routes, or closure predicate can be done with ~60 lines of context vs ~400+ lines today
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**Would it reduce context required for future reasoning changes:** LIKELY YES
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- Confirmation logic is conceptually independent from graph traversal
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- Factor-detection logic is independently auditable
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- Today all three are interleaved inside applyValidatedProposal, requiring the reader to mentally separate concerns while reading ~150 lines of inline code
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---
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## CRITICAL DISTINCTION
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**Choice: D — EXTRACT PURE DECISION-SUFFICIENCY UNIT**
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**Why:** The evaluation logic (confirmation detection + remaining-factor counting + closure predicate) is entirely pure and self-contained. It should own itself as a unit. Graph mutation stays in apply-proposal.js per principle #4. This is the narrowest boundary that achieves goals #1–#7.
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---
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## MINIMUM REFACTOR BOUNDARY
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**Choice: B — one new decision-sufficiency module**
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**Why:** A single `decision-sufficiency.js` module containing all five functions (`isUserConfirmationOfNoRemainingUncertainty`, `hasRemainingMaterialFactors`, `countRemainingMaterialFactors`, `shouldCloseDecision`, and `TERMINAL_STATUSES`) achieves:
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- Zero semantic change (all existing exports preserved)
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- 60B.64 behaviour identical (apply-proposal.js calls the same predicate, produces same result)
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- Apply-proposal orchestration fully visible (~40 lines)
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- Graph mutation ownership stays in apply-proposal
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- Pure logic independently testable (`shouldCloseDecision` is the ideal unit test target)
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- No schema change
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- No prompt change
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- Future edits require less context
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---
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## REFACTOR TIMING
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**Choice: B — RUN LIVE REGRESSION FIRST, THEN REFACTOR**
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**Why:** The current implementation passes its targeted behavioural tests. Introducing a refactor before verifying that live regression (60B.56) still passes would conflate two risk vectors: regression risk + extraction risk. Running regression first provides confidence that the existing code is correct, making any subsequent extraction's "zero semantic change" claim verifiable against a known-good baseline.
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---
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## IMPLEMENTATION READINESS
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**Choice: A — READY FOR ZERO-SEMANTIC-CHANGE REFACTOR**
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If B (one more design question required), the unresolved question would be: should `shouldCloseDecision` return just `boolean` or a richer shape `{ hasRemainingFactors, userConfirmedNoRemainingUncertainty, shouldClose }` for diagnostic logging? This does not affect correctness of extraction — only post-refactor API surface.
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**Smallest zero-semantic-change refactor:**
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Extract all decision-sufficiency evaluation logic to a single `decision-sufficiency.js` module with 5 exports, replace the inline closure evaluation in apply-proposal.js with a call to `shouldCloseDecision`, and keep mutation code in apply-proposal.js.
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---
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## CONSTRAINTS CHECK
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```text
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Production code changed: NO
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Tests changed: NO
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Prompt changed: NO
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Schema changed: NO
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Ollama calls: 0
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Live API calls: 0
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Vitest run: NO
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Jest run: NO
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Watchman used: NO
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```
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