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Enforce deterministic state transitions for Workspace V2 session flow and eliminate edge-case paths - PR_11_265
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# PR_11_265 Deterministic State Transition Enforcement Report
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## Scope
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Workspace V2 only (session library / diff / merge transition-state enforcement).
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## Files Changed
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- tools/workspace-v2/index.js
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- tests/runtime/V2DeterministicStateTransitions.test.mjs
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- tests/runtime/V2SessionStateModelConsolidation.test.mjs
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- docs/pr/PLAN_PR_11_265_WORKSPACE_V2_DETERMINISTIC_STATE_TRANSITION_ENFORCEMENT.md
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- docs/pr/BUILD_PR_11_265_WORKSPACE_V2_DETERMINISTIC_STATE_TRANSITION_ENFORCEMENT.md
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## Implementation Summary
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- Enforced explicit action-based state transitions through:
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- `requestWorkspaceTransition(actionName, model)`
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- `isWorkspaceTransitionAllowed(actionName, model)`
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- `computeNextWorkspaceTransitionState(actionName, model)`
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- Transition states are explicit and deterministic:
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- `idle`
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- `valid_selection`
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- `preview_ready`
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- `preview_active`
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- `merge_applied`
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- `undo_available`
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- Wired controlled transition paths into merge actions:
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- preview: `preview_merge`
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- confirm: `confirm_preview`
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- apply: `apply_merge`
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- undo: `undo_merge`
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- Routed selection/delete refreshes through explicit refresh actions:
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- selection change: `selection_change`
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- delete session: `delete_session`
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- load/recompute: `refresh_load`
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- Removed remaining direct merge button-state writes from `renderSessionMergeInputs()` so button state is model-driven only.
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- Invalid action attempts now return without mutating merge state.
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## PR_11_264 Regression Confirmation
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- Kept PR_11_264 model/render/refresh architecture intact:
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- `computeWorkspaceSessionUiStateModel()`
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- `renderWorkspaceSessionUiStateModel(model)`
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- `refreshWorkspaceSessionUiStateModel(actionName = "refresh_load")`
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- Preserved stabilized UI text behavior checks via targeted tests.
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## Validation Commands
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1. `node --check tools/workspace-v2/index.js`
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- PASS
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2. `node --check tests/runtime/V2DeterministicStateTransitions.test.mjs`
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- PASS
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3. `node --check tests/runtime/V2SessionStateModelConsolidation.test.mjs`
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- PASS
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4. `node tests/runtime/V2DeterministicStateTransitions.test.mjs`
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- PASS
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- Results: `tmp/v2-deterministic-state-transitions-results.json`
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5. `node tests/runtime/V2SessionStateModelConsolidation.test.mjs`
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- PASS
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- Results: `tmp/v2-session-state-model-consolidation-results.json`
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## Full Samples Smoke Decision
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- Skipped full samples smoke test.
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- Reason: changes are scoped to Workspace V2 merge-state model/handlers with targeted runtime validation coverage.
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# BUILD_PR_11_265_WORKSPACE_V2_DETERMINISTIC_STATE_TRANSITION_ENFORCEMENT
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## Purpose
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Make Workspace V2 session merge-state transitions explicit, controlled, and deterministic for preview/confirm/apply/undo flows.
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## Files
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- tools/workspace-v2/index.js
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- tests/runtime/V2DeterministicStateTransitions.test.mjs
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- docs/dev/reports/PR_11_265_deterministic_state_transition_enforcement_report.md
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## Implementation
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1. Keep one transition state field and explicit state names.
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2. Gate merge actions (`preview_merge`, `confirm_preview`, `apply_merge`, `undo_merge`) through transition checks.
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3. Route selection/delete UI updates through explicit refresh action names.
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4. Remove direct merge button state writes outside the consolidated render model.
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5. Ensure invalid actions return without unintended state mutation.
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6. Add targeted runtime validation for deterministic transitions and PR_11_264 regression coverage.
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## Acceptance
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- All merge actions transition only through controlled paths.
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- Illegal transitions do not corrupt UI state.
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- Refresh/load reconstructs a valid state from current data.
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- No regressions to PR_11_264 state-model behavior.
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## Validation
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- node --check tools/workspace-v2/index.js
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- node --check tests/runtime/V2DeterministicStateTransitions.test.mjs
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- node tests/runtime/V2DeterministicStateTransitions.test.mjs
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- node tests/runtime/V2SessionStateModelConsolidation.test.mjs
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# PLAN_PR_11_265_WORKSPACE_V2_DETERMINISTIC_STATE_TRANSITION_ENFORCEMENT
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## Purpose
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Enforce deterministic Workspace V2 merge-state transitions with explicit action-gated state changes.
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## Scope
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- tools/workspace-v2/index.js
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- tests/runtime/V2DeterministicStateTransitions.test.mjs
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- PR docs/report only
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## Goals
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- Define and enforce explicit transition states:
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- `idle`
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- `valid_selection`
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- `preview_ready`
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- `preview_active`
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- `merge_applied`
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- `undo_available`
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- Ensure preview/confirm/apply/undo actions pass through controlled transition checks.
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- Prevent illegal transitions from mutating UI/session merge state.
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- Keep UI render decisions derived from the existing PR_11_264 state-model refresh path.
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## Out of Scope
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- No schema changes
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- No cross-tool changes
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- No Workspace Manager v1 changes
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## Validation
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- node --check tools/workspace-v2/index.js
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- node --check tests/runtime/V2DeterministicStateTransitions.test.mjs
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- node tests/runtime/V2DeterministicStateTransitions.test.mjs
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- node tests/runtime/V2SessionStateModelConsolidation.test.mjs
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import assert from "node:assert/strict";
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import fs from "node:fs";
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import path from "node:path";
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import { execFileSync } from "node:child_process";
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import { fileURLToPath, pathToFileURL } from "node:url";
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const __filename = fileURLToPath(import.meta.url);
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const __dirname = path.dirname(__filename);
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const repoRoot = path.resolve(__dirname, "..", "..");
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const jsPath = path.join(repoRoot, "tools", "workspace-v2", "index.js");
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const testPath = path.join(repoRoot, "tests", "runtime", "V2DeterministicStateTransitions.test.mjs");
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const resultsPath = path.join(repoRoot, "tmp", "v2-deterministic-state-transitions-results.json");
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function checkSyntax(filePath) {
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try {
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execFileSync(process.execPath, ["--check", filePath], {
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cwd: repoRoot,
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stdio: ["ignore", "pipe", "pipe"]
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});
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return { ok: true, error: "" };
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} catch (error) {
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return { ok: false, error: (error?.stderr || error?.stdout || error?.message || "").toString().trim() };
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}
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}
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function computeStateFromModel(model) {
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if (model.undoEnabled) return "undo_available";
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if (model.hasMergedResult) return "merge_applied";
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if (model.previewExists && (model.mergeCanConfirm || model.mergeCanApply)) return "preview_ready";
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if (model.previewExists) return "preview_active";
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if (model.mergeCanPreview) return "valid_selection";
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return "idle";
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}
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function isAllowed(actionName, model) {
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if (actionName === "refresh_load") return true;
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if (actionName === "selection_change") return true;
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if (actionName === "delete_session") return true;
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if (actionName === "preview_merge") return model.mergeCanPreview;
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if (actionName === "confirm_preview") return model.mergeCanConfirm;
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if (actionName === "apply_merge") return model.mergeCanApply;
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if (actionName === "undo_merge") return model.undoEnabled;
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return false;
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}
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function nextState(actionName, model) {
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if (actionName === "preview_merge") return "preview_active";
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if (actionName === "confirm_preview") return "preview_ready";
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if (actionName === "apply_merge") return model.undoEnabled ? "undo_available" : "merge_applied";
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return computeStateFromModel(model);
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}
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export function run() {
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const failures = [];
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const jsExists = fs.existsSync(jsPath);
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const js = jsExists ? fs.readFileSync(jsPath, "utf8") : "";
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const jsSyntax = checkSyntax(jsPath);
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const testSyntax = checkSyntax(testPath);
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if (!jsExists) failures.push("Missing tools/workspace-v2/index.js.");
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if (!jsSyntax.ok) failures.push("tools/workspace-v2/index.js failed syntax check.");
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if (!testSyntax.ok) failures.push("tests/runtime/V2DeterministicStateTransitions.test.mjs failed syntax check.");
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const requiredTokens = [
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"this.workspaceTransitionState = \"idle\";",
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"computeWorkspaceTransitionStateFromModel(model)",
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"isWorkspaceTransitionAllowed(actionName, model)",
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"computeNextWorkspaceTransitionState(actionName, model)",
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"requestWorkspaceTransition(actionName, model)",
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"refreshWorkspaceSessionUiStateModel(actionName = \"refresh_load\")",
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"this.refreshWorkspaceSessionUiStateModel(\"selection_change\")",
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"this.refreshWorkspaceSessionUiStateModel(\"delete_session\")",
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"this.requestWorkspaceTransition(\"preview_merge\", this.computeWorkspaceSessionUiStateModel())",
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"this.requestWorkspaceTransition(\"confirm_preview\", this.computeWorkspaceSessionUiStateModel())",
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"this.requestWorkspaceTransition(\"apply_merge\", this.computeWorkspaceSessionUiStateModel())",
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"this.requestWorkspaceTransition(\"undo_merge\", this.computeWorkspaceSessionUiStateModel())"
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];
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requiredTokens.forEach((token) => {
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if (!js.includes(token)) failures.push(`Missing deterministic-transition token/text: ${token}`);
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});
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const preservedModelTokens = [
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"computeWorkspaceSessionUiStateModel()",
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"renderWorkspaceSessionUiStateModel(model)",
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"Compute Diff is enabled.",
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"Preview Merge is enabled.",
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"Confirm Preview is enabled.",
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"Apply Merge is enabled."
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];
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preservedModelTokens.forEach((token) => {
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if (!js.includes(token)) failures.push(`PR_11_264 regression token missing: ${token}`);
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});
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const modelIdle = {
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mergeCanPreview: false,
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mergeCanConfirm: false,
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mergeCanApply: false,
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previewExists: false,
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undoEnabled: false,
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hasMergedResult: false
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};
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const modelValidSelection = {
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...modelIdle,
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mergeCanPreview: true
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};
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const modelPreviewConfirmable = {
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...modelIdle,
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mergeCanPreview: true,
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previewExists: true,
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mergeCanConfirm: true
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};
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const modelPreviewApply = {
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...modelIdle,
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mergeCanPreview: true,
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previewExists: true,
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mergeCanApply: true
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};
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const modelUndo = {
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...modelIdle,
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undoEnabled: true
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};
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const initialState = computeStateFromModel(modelIdle);
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if (initialState !== "idle") failures.push("Initial state should be idle.");
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if (isAllowed("preview_merge", modelIdle)) failures.push("Preview must be blocked without a valid selection.");
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if (!isAllowed("preview_merge", modelValidSelection)) failures.push("Preview must be allowed with valid distinct selection.");
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const previewState = nextState("preview_merge", modelValidSelection);
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if (previewState !== "preview_active") failures.push("preview_merge should transition to preview_active.");
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if (!isAllowed("confirm_preview", modelPreviewConfirmable)) failures.push("confirm_preview should be allowed for fresh conflict-free preview.");
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const confirmState = nextState("confirm_preview", modelPreviewConfirmable);
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if (confirmState !== "preview_ready") failures.push("confirm_preview should transition to preview_ready.");
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if (!isAllowed("apply_merge", modelPreviewApply)) failures.push("apply_merge should be allowed only after confirm-ready model.");
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const applyState = nextState("apply_merge", modelPreviewApply);
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if (applyState !== "merge_applied") failures.push("apply_merge should transition to merge_applied before authoritative undo recompute.");
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if (!isAllowed("undo_merge", modelUndo)) failures.push("undo_merge should be allowed when authoritative merge record exists.");
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const recomputedAfterUndo = nextState("undo_merge", modelIdle);
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if (recomputedAfterUndo !== "idle") failures.push("undo_merge recompute should return idle when authoritative merge record is cleared.");
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fs.mkdirSync(path.dirname(resultsPath), { recursive: true });
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fs.writeFileSync(resultsPath, `${JSON.stringify({
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generatedAt: new Date().toISOString(),
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failures,
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checks: { jsExists, jsSyntax, testSyntax },
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states: {
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initialState,
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previewState,
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confirmState,
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applyState,
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recomputedAfterUndo
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}
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}, null, 2)}
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`, "utf8");
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console.log(`v2 deterministic-state-transitions results: ${resultsPath}`);
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assert.equal(failures.length, 0, `V2 deterministic-state-transitions failures: ${failures.join(" | ")}`);
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return { failures };
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}
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if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
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try {
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const summary = run();
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console.log(JSON.stringify(summary, null, 2));
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} catch (error) {
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console.error(error);
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process.exitCode = 1;
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}
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}

tests/runtime/V2SessionStateModelConsolidation.test.mjs

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const requiredTokens = [
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"computeWorkspaceSessionUiStateModel()",
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"renderWorkspaceSessionUiStateModel(model)",
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"refreshWorkspaceSessionUiStateModel()",
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"refreshWorkspaceSessionUiStateModel(actionName = \"refresh_load\")",
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"updateSessionLibraryActionState() {",
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"updateDiffSelectionFeedbackAndState() {",
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"updateMergeSelectionFeedbackAndState() {",
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"updateUndoLastMergeState() {",
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"this.refreshWorkspaceSessionUiStateModel();",
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"this.refreshWorkspaceSessionUiStateModel(\"refresh_load\");",
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"this.mergeOutputNode.hidden = !model.mergePreviewVisible;"
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];
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requiredTokens.forEach((token) => {

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