fix: make join approval atomic

backend/test/routes-sessions.test.ts

@@ -106,6 +106,33 @@ test("POST /sessions/:id/resume configura Pi con il thinking persistito", async
   expect(configured.thinking).toBe("medium");
 });
 
+test("POST /sessions/:id/resume usa il thinking globale se manca nel manifest", async () => {
+  let configured: any;
+  const bridge = { onClientEvent: () => {}, emitClientEvent: () => {} };
+  const runtime = { bridge } as any;
+  const mgr = {
+    get: () => undefined,
+    createFor: () => runtime,
+    configure: async (_rt: any, options: any) => { configured = options; },
+    start: () => {},
+    teardown: () => {},
+  } as any;
+  const app = buildApp(loadConfig({ THT_HARNESS_DIR: "../harness" }), {
+    mgr,
+    thtRunner: {
+      ollamaEnsure: async () => ({ ok: true }),
+      sessionShow: async () => ({ status: "open", archived: false }),
+      reopenSession: async () => {},
+    } as any,
+    getSettings: () => ({ workspace: "psd", thinking: "low" }) as any,
+  });
+
+  await app.inject({ method: "POST", url: "/sessions/s-thinking/resume" });
+  await new Promise((resolve) => setImmediate(resolve));
+
+  expect(configured.thinking).toBe("low");
+});
+
 test("POST /sessions/:id/response inoltra al bridge (no error)", async () => {
   const app = buildApp(loadConfig({ THT_HARNESS_DIR: "../harness" }), {
     thtRunner: {

docs/superpowers/plans/2026-07-14-workflow-ui-regressions.md

@@ -93,6 +93,9 @@ Expected: PASS.
 - Modify: `harness/.pi/extensions/tht-gate.js`
 - Create: `harness/.pi/extensions/gate/__tests__/gate_join_review.test.js`
 - Modify: `harness/.pi/skills/tht-sessione/SKILL.md`
+- Modify: `harness/tht/decisions.py`
+- Modify: `harness/tht/cli/decision_cmd.py`
+- Create: `harness/tests/test_decision_join_set_cli.py`
 - Create: `frontend/src/widgets/JoinReviewWidget.tsx`
 - Create: `frontend/src/widgets/JoinReviewWidget.test.tsx`
 - Modify: `frontend/src/widgets/index.ts`
@@ -108,7 +111,8 @@ Expected: PASS.
 
 Assert the builder emits read-only option details, `confirm_label: "Continue"`, and reserved controls.
 Exercise `reviewer_decide` with only `join_modified` decisions; queue a Continue response containing
-all ids and assert every `tht decision add` call occurs. Queue `control:"freetext"` and assert no
+all ids and assert one atomic `tht decision add-join-set` call occurs. Queue malformed and partial
+responses and assert the widget is presented again. Queue `control:"freetext"` and assert no
 decision is written.
 
 - [x] **Step 2: Run harness tests and verify RED**
@@ -125,7 +129,8 @@ Add `buildJoinReviewRequest`. In `reviewer_decide`, detect a non-empty, join-onl
 const joinOnly = opts.length > 0 && opts.every((o) => o.decision.type === "join_modified");
 ```
 
-Emit `join-review` with `detail` and `rationale`; after Continue persist all original decisions.
+Emit `join-review` with `detail` and `rationale`; accept only a response carrying the exact complete
+id set. After Continue persist all original decisions through atomic `decision add-join-set`.
 On free text, return feedback without persistence. Keep all other decisions on `multiselect`.
 
 - [x] **Step 4: Write failing frontend widget tests**
@@ -269,7 +274,7 @@ Expected: PASS.
 - Running Compose services must use the newly built `thothii-core:local` and
   `thothii-frontend:local` image ids.
 
-- [ ] **Step 1: Run all regression suites**
+- [x] **Step 1: Run all regression suites**
 
 Run: `cd backend && npx vitest run && npx tsc --noEmit -p . && npm run build`
 

docs/superpowers/specs/2026-07-14-workflow-ui-regressions-design.md

@@ -35,9 +35,11 @@ the configured model activity.
 
 F4 calls to `reviewer_decide` whose merit decisions are all `join_modified` become a read-only
 `join-review` widget. Each proposed join is rendered as an informational card with its name,
-join expression, and rationale. `Continue` returns every join id; the gate persists all decisions.
-`Other — specify` returns textual feedback without persisting the current proposal, so the model
-must revise and present the complete join set again. Mixed join/non-join calls remain regular
+join expression, and rationale. `Continue` returns every join id; the gate accepts only that exact
+complete response and persists all decisions through one atomic ledger replacement. Malformed or
+partial responses re-present the widget. `Other — specify` returns textual feedback without
+persisting the current proposal, so the model must revise and present the complete join set again.
+Mixed join/non-join calls remain regular
 multiselects, and the skill instructs the model to keep joins in a separate call.
 
 ### CTE presentation

harness/.pi/extensions/gate/__tests__/gate_join_review.test.js

@@ -33,9 +33,10 @@ const JOIN_OPTIONS = [
   },
 ];
 
-function shellStub(calls) {
-  return (_file, args) => {
+function shellStub(calls, inputs = []) {
+  return (_file, args, options = {}) => {
     calls.push(args.join(" "));
+    if (options.input) inputs.push(options.input);
     if (args[0] === "phase" && args[1] === "meta") {
       return JSON.stringify({ phases: [{ num: 4, id: "F4" }] });
     }
@@ -46,8 +47,9 @@ function shellStub(calls) {
 
 test("join-only reviewer_decide is read-only and Continue persists every join", async () => {
   const calls = [];
+  const inputs = [];
   const original = cp.execFileSync;
-  cp.execFileSync = shellStub(calls);
+  cp.execFileSync = shellStub(calls, inputs);
   try {
     const gate = require(GATE);
     const { createFakePi } = require("./fake_pi_runtime.js");
@@ -77,9 +79,48 @@ test("join-only reviewer_decide is read-only and Continue persists every join",
     assert.equal(descriptor.widget, "join-review");
     assert.equal(descriptor.options[0].detail, JOIN_OPTIONS[0].decision.detail);
     assert.equal(descriptor.options[0].rationale, JOIN_OPTIONS[0].decision.rationale);
-    const decisions = calls.filter((call) => call.startsWith("decision add"));
-    assert.equal(decisions.length, 2);
-    assert.ok(decisions.every((call) => call.includes("--type join_modified")));
+    const decisions = calls.filter((call) => call.startsWith("decision add-join-set"));
+    assert.equal(decisions.length, 1);
+    assert.deepEqual(JSON.parse(inputs[0]), JOIN_OPTIONS.map((option) => option.decision));
+  } finally {
+    cp.execFileSync = original;
+  }
+});
+
+test("partial join-review responses are rejected and the widget is presented again", async () => {
+  const calls = [];
+  const original = cp.execFileSync;
+  cp.execFileSync = shellStub(calls);
+  try {
+    const gate = require(GATE);
+    const { createFakePi } = require("./fake_pi_runtime.js");
+    const { pi, ctx, tools } = createFakePi();
+    ctx.cwd = "/nonexistent-thothii-test-cwd";
+    gate.default(pi);
+
+    let attempts = 0;
+    ctx.ui.input = async (title) => {
+      const descriptor = JSON.parse(title);
+      attempts += 1;
+      return JSON.stringify({
+        id: descriptor.id,
+        kind: attempts === 1 ? "multiselect" : "join-review",
+        choices: attempts === 2
+          ? [descriptor.options[0].id]
+          : descriptor.options.map((option) => option.id),
+      });
+    };
+
+    const tool = tools.get("reviewer_decide");
+    await tool.def.execute(
+      "call-partial",
+      { session: "s1", title: "Review joins", options: JOIN_OPTIONS, advance: false },
+      null,
+      null,
+      ctx,
+    );
+
+    assert.equal(attempts, 3);
   } finally {
     cp.execFileSync = original;
   }

harness/.pi/extensions/tht-gate.js

@@ -246,9 +246,9 @@ function tht(ctx, args, input) {
 
 // Runs a privileged tht call; converts any failure into an actionable textResult
 // (never propagates a raw "Command failed" to the model).
-function relayIfThtFails(ctx, args, recovery) {
+function relayIfThtFails(ctx, args, recovery, input) {
 	try {
-		tht(ctx, args);
+		tht(ctx, args, input);
 		return null;
 	} catch (e) {
 		const cliMsg = (e.stderr || e.message || String(e)).toString().trim();
@@ -380,6 +380,16 @@ export function resolveConfirmOutcome(resp) {
 	return { kind: "unknown", choice };
 }
 
+export function isJoinReviewApproval(resp, optionIds) {
+	if (resp?.kind !== "join-review" || !Array.isArray(resp.choices)) return false;
+	const expected = new Set(optionIds);
+	const chosen = new Set(resp.choices);
+	return expected.size === optionIds.length &&
+		chosen.size === resp.choices.length &&
+		chosen.size === expected.size &&
+		[...chosen].every((id) => expected.has(id));
+}
+
 // True when a reviewer_decide has no merito options but is allowed to close empty
 // and advance (the empty memory phase F2). The gate then shows an info notice and
 // auto-advances instead of presenting an empty checklist.
@@ -764,7 +774,15 @@ export default function (pi) {
 					options: meritOptions,
 					...(phase === "F2" ? memorySelectionWidgetProps(opts) : {}),
 				});
-			const resp = await emitAndWait(ctx, widget);
+			let resp;
+			for (;;) {
+				resp = await emitAndWait(ctx, widget);
+				if (resp.control === "freetext" || resp.control === "back" || resp.control === "exit")
+					break;
+				if (!joinOnly || isJoinReviewApproval(resp, meritOptions.map((option) => option.id)))
+					break;
+				await reLoop(ctx);
+			}
 			if (resp.control === "freetext") {
 				return textResult(
 					`Altro (reviewer): ${resp.text}. Riformula la proposta tenendo conto.`,
@@ -777,12 +795,24 @@ export default function (pi) {
 			const chosen = joinOnly
 				? opts.filter((o) => !isReserved(o.label))
 				: opts.filter((o) => (resp.choices ?? []).includes(o.id));
+			if (joinOnly) {
+				const decisions = chosen.map((choice) => choice.decision);
+				const err = relayIfThtFails(
+					ctx,
+					["decision", "add-join-set", "--session", session, "--doc", "-"],
+					"Il set di join non è stato registrato; correggi l'errore e riprova.",
+					JSON.stringify(decisions),
+				);
+				if (err) return err;
+				toAdd.push(...decisions);
+			} else {
 				for (const c of chosen) {
 					const d = c.decision;
 					const err = relayIfThtFails(ctx, decisionAddArgs(session, d), "");
 					if (err) return err;
 					toAdd.push(d);
 				}
+			}
 			if (advance) advanceIfReady(ctx, session);
 			return textResult(
 				toAdd.length

harness/.pi/skills/tht-sessione/SKILL.md

@@ -284,8 +284,9 @@ Prerequisite: Phase 3 closed.
    `reviewer_decide(advance:false)`, registering `join_modified`. Do not mix
    `join_modified` with other decision types in that call. The gate renders this proposal
    as read-only information: **Continue records every proposed join**; the reviewer cannot
-   remove individual joins (which could create an accidental Cartesian product). If the
-   reviewer uses **Other — specify**, none of the current joins is recorded: incorporate
+   remove individual joins (which could create an accidental Cartesian product). The complete
+   set is persisted atomically: an invalid response or write failure records none of it. If
+   the reviewer uses **Other — specify**, none of the current joins is recorded: incorporate
    the textual correction and present the complete revised join set again.
    Ground joins in the `【Foreign keys】` section of the mschema-text
    render: it lists the curated logical FKs of the workspace (e.g.

harness/tests/test_decision_join_set_cli.py

@@ -0,0 +1,93 @@
+import json
+
+import pytest
+from typer.testing import CliRunner
+
+from tht.cli.decision_cmd import decision_app
+from tht.decisions import append_decision, append_decisions, list_decisions
+from tht.phase import current_phase
+
+
+def _walk_to_phase(session, target):
+    while current_phase(session) < target:
+        append_decision(session, type="phase_approved", subject=f"phase:{current_phase(session)}")
+
+
+def _configure_command(monkeypatch, sessions):
+    import tht.cli.decision_cmd as mod
+
+    class _Cfg:
+        class paths:
+            pass
+
+    _Cfg.paths.sessions = sessions
+    monkeypatch.setattr(mod, "_load_config_or_exit", lambda _c: _Cfg())
+    monkeypatch.setattr(mod, "load_session_or_exit", lambda _cfg, _s: None)
+    monkeypatch.setattr(mod, "session_dir", lambda _cfg, sid: sessions / sid)
+
+
+def test_add_join_set_rejects_the_whole_batch_when_one_item_is_invalid(tmp_path, monkeypatch):
+    session_id = "s1"
+    session = tmp_path / session_id
+    session.mkdir()
+    _walk_to_phase(session, 4)
+    _configure_command(monkeypatch, tmp_path)
+
+    payload = [
+        {"type": "join_modified", "subject": "a-b", "detail": "a.id = b.a_id"},
+        {"type": "not_a_decision", "subject": "b-c", "detail": "b.id = c.b_id"},
+    ]
+    result = CliRunner().invoke(
+        decision_app,
+        ["add-join-set", "--session", session_id, "--doc", "-"],
+        input=json.dumps(payload),
+    )
+
+    assert result.exit_code != 0
+    assert not [decision for decision in list_decisions(session) if decision.type == "join_modified"]
+
+
+def test_add_join_set_appends_the_complete_valid_batch(tmp_path, monkeypatch):
+    session_id = "s1"
+    session = tmp_path / session_id
+    session.mkdir()
+    _walk_to_phase(session, 4)
+    _configure_command(monkeypatch, tmp_path)
+
+    payload = [
+        {"type": "join_modified", "subject": "a-b", "detail": "a.id = b.a_id"},
+        {"type": "join_modified", "subject": "b-c", "detail": "b.id = c.b_id"},
+    ]
+    result = CliRunner().invoke(
+        decision_app,
+        ["add-join-set", "--session", session_id, "--doc", "-"],
+        input=json.dumps(payload),
+    )
+
+    assert result.exit_code == 0, result.output
+    joins = [decision for decision in list_decisions(session) if decision.type == "join_modified"]
+    assert [decision.subject for decision in joins] == ["a-b", "b-c"]
+
+
+def test_atomic_replace_failure_keeps_the_original_ledger(tmp_path, monkeypatch):
+    session = tmp_path / "s1"
+    session.mkdir()
+    append_decision(session, type="phase_approved", subject="phase:1")
+    original = (session / "review_decisions.jsonl").read_text()
+
+    import tht.decisions as mod
+
+    def fail_replace(_source, _target):
+        raise OSError("disk failure")
+
+    monkeypatch.setattr(mod.os, "replace", fail_replace)
+    with pytest.raises(OSError, match="disk failure"):
+        append_decisions(
+            session,
+            [
+                {"type": "join_modified", "subject": "a-b"},
+                {"type": "join_modified", "subject": "b-c"},
+            ],
+        )
+
+    assert (session / "review_decisions.jsonl").read_text() == original

harness/tht/cli/decision_cmd.py

@@ -1,7 +1,10 @@
+import json
+import sys
 from pathlib import Path
 from typing import get_args
 
 import typer
+from pydantic import ValidationError
 
 from tht.cli.config_cmd import CONFIG_OPT
 from tht.cli.schema_cmd import _load_config_or_exit
@@ -10,6 +13,40 @@ from tht.cli.session_cmd import load_session_or_exit, session_dir
 decision_app = typer.Typer(help="Decisioni del reviewer (per sessione, append-only)")
 
 
+@decision_app.command("add-join-set")
+def add_join_set_cmd(
+    session: str = typer.Option(..., "--session", help="Id della sessione."),
+    doc: str = typer.Option(..., "--doc", help="Array JSON di join; usa '-' per stdin."),
+    config: Path = CONFIG_OPT,
+) -> None:
+    """Registra un insieme completo di join con un'unica sostituzione atomica del ledger."""
+    from tht.decisions import DecisionInput, append_decisions
+
+    cfg = _load_config_or_exit(config)
+    load_session_or_exit(cfg, session)
+    try:
+        raw = sys.stdin.read() if doc == "-" else Path(doc).read_text()
+        payload = json.loads(raw)
+        if not isinstance(payload, list) or not payload:
+            raise ValueError("il documento deve essere un array JSON non vuoto")
+        decisions = [DecisionInput.model_validate(item) for item in payload]
+        if any(decision.type != "join_modified" for decision in decisions):
+            raise ValueError("tutte le decisioni devono avere type=join_modified")
+    except (OSError, json.JSONDecodeError, ValidationError, ValueError) as error:
+        typer.secho(f"ERRORE: set di join non valido: {error}", fg=typer.colors.RED, err=True)
+        raise typer.Exit(code=1) from error
+
+    from tht.cli.phase_cmd import require_phase_or_exit
+    from tht.workflow import load_workflow
+
+    require_phase_or_exit(cfg, session, load_workflow().decision_min_phase("join_modified"))
+    records = append_decisions(session_dir(cfg, session), decisions)
+    typer.secho(
+        f"OK: registrato set atomico di {len(records)} join.",
+        fg=typer.colors.GREEN,
+    )
+
+
 @decision_app.command("add")
 def add_cmd(
     session: str = typer.Option(..., "--session", help="Id della sessione."),

harness/tht/decisions.py

@@ -1,3 +1,5 @@
+import os
+import tempfile
 from datetime import UTC, datetime
 from pathlib import Path
 from typing import Literal
@@ -70,6 +72,14 @@ class DecisionRecord(BaseModel):
     phase: int | None = None
 
 
+class DecisionInput(BaseModel):
+    type: DecisionType
+    subject: str
+    detail: str = ""
+    rationale: str = ""
+    retracts: int | None = None
+
+
 def list_decisions(session_dir: Path) -> list[DecisionRecord]:
     path = session_dir / DECISIONS_FILE
     if not path.exists():
@@ -90,24 +100,58 @@ def append_decision(
     rationale: str = "",
     retracts: int | None = None,
 ) -> DecisionRecord:
+    return append_decisions(
+        session_dir,
+        [{
+            "type": type,
+            "subject": subject,
+            "detail": detail,
+            "rationale": rationale,
+            "retracts": retracts,
+        }],
+    )[0]
+
+
+def append_decisions(
+    session_dir: Path,
+    decisions: list[DecisionInput | dict],
+) -> list[DecisionRecord]:
+    """Validate and append a decision set through one atomic file replacement."""
+    inputs = [DecisionInput.model_validate(decision) for decision in decisions]
+    if not inputs:
+        return []
+
     # Fase corrente PRIMA dell'append (high-water-mark D15). Import lazy: phase.py
     # importa decisions.py (ciclo). Per i marker di fase (subject "phase:N") il valore
     # e' ridondante col subject; per le decisioni sostanziali con subject "a nome"
     # (cte_approved, ...) e' l'unico modo per filtrarle dopo un reopen.
     from tht.phase import current_phase
 
-    record = DecisionRecord(
-        seq=len(list_decisions(session_dir)) + 1,
+    existing = list_decisions(session_dir)
+    phase = current_phase(session_dir)
+    records = [
+        DecisionRecord(
+            seq=len(existing) + index,
             ts=datetime.now(UTC),
-        type=type,
-        subject=subject,
-        detail=detail,
-        rationale=rationale,
-        retracts=retracts,
-        phase=current_phase(session_dir),
+            phase=phase,
+            **decision.model_dump(),
         )
+        for index, decision in enumerate(inputs, start=1)
+    ]
     path = session_dir / DECISIONS_FILE
     path.parent.mkdir(parents=True, exist_ok=True)
-    with path.open("a") as f:
-        f.write(record.model_dump_json() + "\n")
-    return record
+    previous = path.read_text() if path.exists() else ""
+    separator = "" if not previous or previous.endswith("\n") else "\n"
+    content = previous + separator + "".join(record.model_dump_json() + "\n" for record in records)
+
+    fd, temporary_name = tempfile.mkstemp(prefix=f".{DECISIONS_FILE}.", dir=path.parent)
+    temporary = Path(temporary_name)
+    try:
+        with os.fdopen(fd, "w") as handle:
+            handle.write(content)
+            handle.flush()
+            os.fsync(handle.fileno())
+        os.replace(temporary, path)
+    finally:
+        temporary.unlink(missing_ok=True)
+    return records