Conversation on the new loop (M2.7)

- Questions never change state (L5, #77): a message ending in "?" to a
  waiting project item starts a question run (reply and look-only tools,
  an instruction to change nothing), and the item goes back to the very
  wait it was in: a restatement up stays up and a go binds to it; the
  agent's own question stays open.
- Explanations: a restatement gives its reasons and the main alternative;
  a revision says what changed (restate(changed), sent back without it);
  a milestone's summary says what was done, verified and left open.
- Progress in prose (#42): the driver's and a helper's own words for a
  turn are posted, trimmed, at most once a minute per item; `details`
  shows the last tool calls; a message arriving mid-run is acknowledged at
  once ("Noted; ...").
- CI: the e2e job's comments and the plan no longer claim a newer push
  cancels the run it supersedes (Gitea here doesn't); the concurrency
  block goes.

Tests: conversation unit tests (questions in a go-ahead and an answer wait,
an unanswerable question, revisions, progress rate and trimming, details,
mid-run notes), the helper's progress, the walk asking questions in every
state with a questions_change_nothing property (routing questions the old
way fails 32 of 48 seeds), and an e2e question while a restatement is up.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPQ14L3LikyefCMFBqEbKE

nisse-dev/src/nisse_dev/delegation.py

@@ -173,6 +173,7 @@ class Delegation:
         now: Callable[[], float] = time.monotonic,
         cancel: Cancel | None = None,
         reader: str = "",
+        on_turn: Callable[[str], None] | None = None,
     ) -> None:
         self._client = client
         self._store = store
@@ -180,6 +181,8 @@ class Delegation:
         # Who acts on the handback, from its capability profile (L9): never
         # a model's name.
         self._reader = reader or "a materially weaker model"
+        # The delegate's own text for each turn, for progress (#42).
+        self._on_turn = on_turn
         self._git = git_repo
         self._model = model
         self._backing_model = backing_model
@@ -400,6 +403,11 @@ class Delegation:
                 transcript.append(event)
                 if isinstance(event, ToolCall):
                     calls.append(event)
+            said = " ".join(
+                e.text.strip() for e in produced if isinstance(e, AssistantText)
+            ).strip()
+            if said and self._on_turn is not None:
+                self._on_turn(said)
 
             if not calls:
                 # A delegate that stops without handing back has not reported,

nisse-dev/src/nisse_dev/loop/agent.py

@@ -29,6 +29,8 @@ from nisse_dev.canonical import (
     DelegationStarted,
     Fact,
     PlanSubmitted,
+    ToolCall,
+    ToolResult,
     UserMessage,
 )
 from nisse_dev.config import GENERAL
@@ -87,6 +89,9 @@ _NAMED = re.compile(r"(go|approve|abandon|stop) (?:([a-z0-9][a-z0-9-]*))?#(\d+)"
 _NEEDS_ITEM = frozenset({"go", "approve", "abandon"})
 BUG_GRACE_S = 600.0
 GENERAL_IDLE_S = 86400.0
+PROGRESS_EVERY_S = 60.0  # progress in prose at a readable rate (L5, #42)
+PROGRESS_CHARS = 400
+DETAILS = 10  # tool calls shown by `details`
 FILE_ISSUE = "file_issue"  # the intent of opening a record issue (L8)
 # Carried by a record issue the agent opens for work started in conversation:
 # intake never takes it for new work, even before its item exists (D1).
@@ -102,9 +107,14 @@ The issue and the conversation about it are below.
 
 Before any work, find out what you need, then use restate to put your
 understanding to the operator: what you take the request to mean, how it fits
-the project, and your first step. Wait for their go-ahead. If the request is
-unclear, ask_human instead of guessing: a restatement asks no questions, so
-the operator can agree to it as it stands.
+the project, your first step, and why that way rather than the main
+alternative. A later restatement says what changed. Wait for their go-ahead.
+If the request is unclear, ask_human instead of guessing: a restatement asks
+no questions, so the operator can agree to it as it stands. At any point,
+asking is better than guessing.
+
+Before each group of tool calls, say in a sentence what you're doing and why:
+the operator sees it as your progress.
 
 The project's documents are in its repository: read ARCHITECTURE.md and any
 build plans under docs/plans/ before you restate.
@@ -119,7 +129,8 @@ the same milestone (don't start another), run the tests, and call
 finish_milestone again to push the fix. When a review needs no change from
 you, or you are only waiting for the operator to merge (you can't merge it
 yourself), call wait_for_review. The next milestone starts only after the
-previous PR has merged. When the last PR has merged, call close_item with
+previous PR has merged. A milestone's summary says what was done, what was
+verified, and what is left open. When the last PR has merged, call close_item with
 what was done, what was verified, and what is left open. If a PR is closed
 without merging, ask the operator what next.
 
@@ -133,6 +144,12 @@ Keep ARCHITECTURE.md current: a design change updates it in the same PR.
 
 {workspace}"""
 
+QUESTION = """
+
+The operator has asked a question (the last message). Answer it with reply,
+from what you know and what you can look at; don't change anything. The item
+then goes back to waiting exactly as it was, so a restatement up stays up."""
+
 CONVERSATION = """You are nisse-dev, a software agent, in a conversation with
 the operator in a Matrix thread. It isn't about a project yet: it may be a
 question, thoughts on feasibility or hardware, or the start of some work.
@@ -257,6 +274,9 @@ class LoopAgent:
         # The project whose workspace was last worked on: switching to
         # another parks it (L1). None after a boot: unknown, so all are.
         self._last_project: str | None = None
+        # Per item: when progress was last posted (L5: a readable rate).
+        self._progressed: dict[str, float] = {}
+        self._active_name = ""  # the running item, for "noted" on arrival
         self._running = False
         self._stop = threading.Event()
         self._intake_thread: threading.Thread | None = None
@@ -743,6 +763,16 @@ class LoopAgent:
             # Straight to the flag: the run is what it has to reach (L2).
             self._cancel.set()
         about = self._shown.get(thread) if thread else None
+        if self._running and command not in ("stop", "status"):
+            # L5: say what happens to a message that can't be read yet.
+            here = thread and thread == self._active_thread
+            self._transport.post(
+                "Noted; I'll read it when this turn ends."
+                if here
+                else f"Noted; I'm in the middle of {self._active_name}, and I'll "
+                "read it when that turn ends.",
+                thread=thread or msg.event_id or None,
+            )
         self._worker.submit(
             self._settled("your message", lambda: self.handle(msg, about))
         )
@@ -814,6 +844,30 @@ class LoopAgent:
             self._close(item, loop, "abandoned", f"abandoned by {msg.sender}")
         elif command == "done" and loop.new_project:
             self._provisioned(item, loop)
+        elif command == "details":
+            self._transport.post(self._details(item), thread=loop.thread)
+        elif (
+            item.position == WAITING
+            and item.scope != GENERAL
+            and is_question(text)
+            and loop.wait in (GO_AHEAD, ANSWER, MERGE)
+        ):
+            # L5: questions never change state. Answered, then back to this
+            # very wait: a restatement up stays up, a go still binds to it.
+            save(
+                self._store,
+                item.id,
+                READY,
+                replace(
+                    loop,
+                    question=True,
+                    back_to=loop.wait,
+                    back_note=loop.note,
+                    wait="",
+                    note="",
+                ),
+                cause="the operator asked a question",
+            )
         elif command == "stop":
             # Stopping a run took effect on arrival; a stop is never an answer.
             if not loop.note.startswith("stopped ("):
@@ -1332,6 +1386,9 @@ class LoopAgent:
             caps=self._helpers.caps,
             cancel=self._cancel,
             reader=self._helpers.reader(roles),
+            on_turn=lambda said: self._progress(
+                f"{item.id}:helper", loop.thread, said, prefix="helper: "
+            ),
         )
         git = milestones.git
         before = git.head_sha()  # where the milestone is, uncommitted work aside
@@ -1432,6 +1489,54 @@ class LoopAgent:
         save(self._store, item.id, READY, loop_of(item), cause="a helper finished")
         return True
 
+    def _changed_problem(self, item_id: str, args: dict[str, object]) -> str | None:
+        """L5: a revision says what changed from the one before."""
+        item = self._store.work_item(item_id)
+        if item is None or loop_of(item).rev == 0:
+            return None
+        if str(args.get("changed", "")).strip():
+            return None
+        return (
+            f"not posted: this is a revision of rev-{loop_of(item).rev}, so say "
+            "in changed what's different and why"
+        )
+
+    def _progress(self, item_id: str, thread: str, said: str, prefix: str = "") -> None:
+        """A turn's own words, posted at a readable rate (L5, #42): at most
+        one a minute per item, the latest when the minute is up."""
+        now = self._clock()
+        if now - self._progressed.get(item_id, float("-inf")) < PROGRESS_EVERY_S:
+            return
+        self._progressed[item_id] = now
+        text = said if len(said) <= PROGRESS_CHARS else said[:PROGRESS_CHARS] + " …"
+        self._transport.post(f"{prefix}{text}", thread=thread)
+
+    def _details(self, item: WorkItem) -> str:
+        """L5: raw tool activity, on request: the item's last tool calls."""
+        events = self._store.transcript(item.id, "driver").read()
+        results = {
+            e.event.call_id: e.event for e in events if isinstance(e.event, ToolResult)
+        }
+        lines = []
+        for e in events:
+            if not isinstance(e.event, ToolCall):
+                continue
+            call, result = e.event, results.get(e.event.call_id)
+            target = call.arguments.get("path") or call.arguments.get("command") or ""
+            outcome = (
+                "no result yet"
+                if result is None
+                else ("ok" if result.success else "failed")
+                + (f": {result.result.strip()[:120]}" if result.result.strip() else "")
+            )
+            who = "" if e.actor == "driver" else f"{e.actor}: "
+            lines.append(f"- {who}{call.tool}({str(target)[:80]}) → {outcome}")
+        if not lines:
+            return f"No tool calls yet on {self._label(item)}."
+        return f"The last tool calls on {self._label(item)}:\n" + "\n".join(
+            lines[-DETAILS:]
+        )
+
     def _design_problem(self, item_id: str) -> str | None:
         """D1, D2: a `design` item agrees its design before any code. Until
         a PR of it has merged, a milestone holds documents only."""
@@ -1544,6 +1649,8 @@ class LoopAgent:
         save(self._store, item.id, RUNNING, loop, cause="driver run")
         # D1: a `discuss` item talks before it restates.
         hold = "discuss" in loop.labels and not loop.talked and not loop.started
+        if loop.question:
+            hold = True  # nothing but answering (below)
         tools = [
             *([] if hold else [RESTATE]),
             ASK_HUMAN,
@@ -1560,6 +1667,8 @@ class LoopAgent:
                 ]
             ),
         ]
+        if loop.question:
+            tools = [REPLY, *_LOOK]
         roles = self._roles_of(item)
         workspace = project.workspace
         system = SYSTEM.format(
@@ -1573,8 +1682,9 @@ class LoopAgent:
                 else ""
             ),
             workspace=workspace.describe() if workspace else "",
-        )
+        ) + (QUESTION if loop.question else "")
         self._active_thread = loop.thread
+        self._active_name = self._label(item)
         self._running = True
         try:
             outcome = self._driver.run(
@@ -1592,10 +1702,14 @@ class LoopAgent:
                     ),
                 },
                 checks={
-                    "restate": _restatement_problem,
+                    "restate": lambda args: (
+                        _restatement_problem(args)
+                        or self._changed_problem(item.id, args)
+                    ),
                     "finish_milestone": lambda args: self._design_problem(item.id),
                 },
                 model=roles.resolve("driver"),
+                on_turn=lambda said: self._progress(item.id, loop.thread, said),
             )
         finally:
             self._running = False
@@ -1607,6 +1721,31 @@ class LoopAgent:
         assert item is not None
         loop = loop_of(item)
         args = outcome.arguments or {}
+        if loop.question:
+            # Back to the wait the question interrupted, as it was (L5).
+            if outcome.kind == "wait" and outcome.tool == "reply":
+                self._transport.post(
+                    str(args.get("text", "")).strip(), thread=loop.thread
+                )
+            else:
+                self._transport.post(
+                    f"I couldn't answer that ({outcome.note or outcome.kind}).",
+                    thread=loop.thread,
+                )
+            self._wait(
+                item,
+                replace(
+                    loop,
+                    wait=loop.back_to,
+                    note=loop.back_note,
+                    question=False,
+                    back_to="",
+                    back_note="",
+                ),
+                None,
+            )
+            self._store.set_active(None, cause="question answered")
+            return
         if outcome.kind == "wait" and outcome.tool == "restate":
             text = str(args.get("text", "")).strip()
             rev = loop.rev + 1
@@ -1622,7 +1761,11 @@ class LoopAgent:
                     f"It's a bug, so I'll go ahead in {round(self._grace / 60)} min "
                     "unless you reply; say go to start now, or reply with changes."
                 )
-            self._transport.post(f"rev-{rev}: {text}\n\n{after}", thread=loop.thread)
+            changed = str(args.get("changed", "")).strip()
+            since = f"\n\nChanged from rev-{rev - 1}: {changed}" if rev > 1 else ""
+            self._transport.post(
+                f"rev-{rev}: {text}{since}\n\n{after}", thread=loop.thread
+            )
             self._wait(
                 item,
                 replace(loop, rev=rev, wait=GO_AHEAD, note="", grace_until=grace),

nisse-dev/src/nisse_dev/loop/driver.py

@@ -12,7 +12,7 @@ from dataclasses import dataclass
 from typing import Any, Literal
 
 from nisse_dev.cancel import Cancel, skip_calls
-from nisse_dev.canonical import ToolCall, ToolResult
+from nisse_dev.canonical import AssistantText, ToolCall, ToolResult
 from nisse_dev.llm import LLMClient, LLMError
 from nisse_dev.loop.tools import WAITING, names
 from nisse_dev.state import Transcript
@@ -63,6 +63,7 @@ class Driver:
         | None = None,
         checks: Mapping[str, Callable[[dict[str, Any]], str | None]] | None = None,
         model: str | None = None,
+        on_turn: Callable[[str], None] | None = None,
     ) -> RunOutcome:
         """``handlers`` answer control tools that don't end the run (e.g.
         start_milestone): each returns a result and whether it succeeded.
@@ -89,6 +90,12 @@ class Driver:
                 transcript.append(event)
                 if isinstance(event, ToolCall):
                     calls.append(event)
+            # The model's own words for the turn: its progress, in prose (#42).
+            said = " ".join(
+                e.text.strip() for e in produced if isinstance(e, AssistantText)
+            ).strip()
+            if said and calls and on_turn is not None:
+                on_turn(said)
             if not calls:
                 if nudged:
                     return RunOutcome("failed", note="kept replying in prose")

nisse-dev/src/nisse_dev/loop/items.py

@@ -58,6 +58,11 @@ class Loop:
     design_merged: bool = False  # a `design` item's design PR has merged (D1, D2)
     helps: int = 0  # delegations so far, for their branch names (L9)
     helped_at: int = 0  # the milestone a helper was last called in for, unasked
+    # A question from the operator is answered without changing the item
+    # (L5): the wait it interrupted, to go back to.
+    question: bool = False
+    back_to: str = ""
+    back_note: str = ""
     # Where the operator last spoke (D5: answer where asked): "" for the
     # Matrix thread, or the PR it came from, with the inline location and a
     # little of what they said, for quoting.

nisse-dev/src/nisse_dev/loop/tools.py

@@ -25,9 +25,12 @@ def _tool(tool: str, description: str, /, **params: str) -> dict[str, Any]:
 RESTATE = _tool(
     "restate",
     "Put your understanding of the request to the operator, in their item's "
-    "thread: what you take it to mean, how it fits the project, and your "
-    "first step. Ends your turn; work starts when they agree.",
+    "thread: what you take it to mean, how it fits the project, your first "
+    "step, and why that way (and the main alternative you considered). Ends "
+    "your turn; work starts when they agree.",
     text="Your restatement, in plain language.",
+    changed="What changed from your previous restatement, and why; leave it "
+    "empty for the first.",
 )
 ASK_HUMAN = _tool(
     "ask_human",

nisse-dev/tests/test_loop.py

@@ -214,7 +214,9 @@ def test_go_starts_the_work_and_close_item_closes_the_issue(h: Harness) -> None:
 
 
 def test_a_go_for_an_earlier_revision_is_not_applied(h: Harness) -> None:
-    h.model.turns.append([call("restate", text="revised: in a new module")])
+    h.model.turns.append(
+        [call("restate", text="revised: in a new module", changed="a new module")]
+    )
     h.agent.intake()
     h.say("put it in its own module")  # changes, so the driver restates rev-2
     assert loop_of(h.item()).rev == 2

nisse-dev/tests/test_loop_help.py

@@ -301,3 +301,26 @@ def test_a_delegation_cut_off_by_a_crash_is_discarded_at_boot(
     ]
     assert any("cut off by a restart and discarded" in f for f in facts)
     assert git
+
+
+def test_a_helpers_progress_is_posted(world: dict[str, Any]) -> None:
+    helper = Spy(
+        [
+            AssistantText(text="Writing helped.py with the constant.", model="hlp"),
+            call("write_file", path="helped.py", content="H = 1\n"),
+        ],
+        [hand_back()],
+    )
+    model = ScriptedModel(
+        RESTATE,
+        [
+            call("start_milestone", name="words"),
+            call("delegate", task="write helped.py"),
+            call("ask_human", question="done?"),
+        ],
+    )
+    agent, transport = loop_agent(world, model, helpers=helpers(helper))
+    agent.intake()
+    say(transport, world, "go")
+    said = [m.text for m in transport.outbound]
+    assert "helper: Writing helped.py with the constant." in said

nisse-dev/tests/test_loop_labels.py

@@ -118,7 +118,7 @@ def test_a_plain_yes_is_a_go_ahead_said_so_first(tmp_path: Path) -> None:
 def test_anything_else_goes_to_the_driver(tmp_path: Path) -> None:
     h = Harness(
         tmp_path,
-        ScriptedModel(RESTATED, [call("restate", text="v2")]),
+        ScriptedModel(RESTATED, [call("restate", text="v2", changed="as you asked")]),
         FakeGitea(issue()),
         reader=Reader(),
     )
@@ -132,7 +132,7 @@ def test_a_question_never_reaches_the_reader(tmp_path: Path) -> None:
     reader = Reader("sounds good?")
     h = Harness(
         tmp_path,
-        ScriptedModel(RESTATED, [call("restate", text="v2")]),
+        ScriptedModel(RESTATED, [call("restate", text="v2", changed="as you asked")]),
         FakeGitea(issue()),
         reader=reader,
     )
@@ -145,7 +145,9 @@ def test_a_plain_yes_to_an_older_revision_is_not_a_go(tmp_path: Path) -> None:
     reader = Reader("yes")
     h = Harness(
         tmp_path,
-        ScriptedModel(RESTATED, [call("restate", text="v2")], STARTED),
+        ScriptedModel(
+            RESTATED, [call("restate", text="v2", changed="as you asked")], STARTED
+        ),
         FakeGitea(issue()),
         reader=reader,
     )
@@ -224,7 +226,12 @@ def test_a_reply_stops_the_bugs_countdown(tmp_path: Path) -> None:
 
 
 def test_a_new_revision_of_a_bug_gets_its_own_countdown(tmp_path: Path) -> None:
-    h, clock = bug(tmp_path, RESTATED, [call("restate", text="v2")], STARTED)
+    h, clock = bug(
+        tmp_path,
+        RESTATED,
+        [call("restate", text="v2", changed="as you asked")],
+        STARTED,
+    )
     h.agent.intake()
     clock.now += 300
     h.say("use the other file")

nisse-dev/tests/test_loop_multi.py

@@ -95,7 +95,7 @@ def test_the_next_milestone_waits_for_the_merge(world: dict[str, Any]) -> None:
     agent, transport = loop_agent(world, model)
     agent.intake()
     say(transport, world, "go")
-    say(transport, world, "how's it going?")
+    say(transport, world, "carry on")
     assert "hasn't merged yet" in result_of(world, "start_milestone")
     assert (item(world).position, loop_of(item(world)).wait) == (WAITING, MERGE)
     assert len(forge.prs) == 1

nisse-dev/tests/test_loop_properties.py

@@ -76,6 +76,8 @@ class PolicyModel:
             return [call("ask_human", question=f"question {self.n}?")]
         if roll < 0.12:
             return [ToolCall(call_id=f"p{self.n}", tool="nonsense", arguments={})]
+        if "reply" in offered and "propose_work" not in offered:
+            return [call("reply", text=f"because {self.n}")]  # a question run
         if "reply" in offered:  # a conversation: talk, or propose work
             if self.rng.random() < 0.1:
                 return [
@@ -99,7 +101,7 @@ class PolicyModel:
         if "restate" not in offered and "finish_milestone" not in offered:
             return [call("ask_human", question=f"talk first {self.n}?")]  # discuss
         if "finish_milestone" not in offered:
-            return [call("restate", text=f"restatement {self.n}")]
+            return [call("restate", text=f"restatement {self.n}", changed=f"c{self.n}")]
         if "delegate" in offered and self.rng.random() < 0.1:
             return [call("delegate", task=f"help {self.n}")]
         if "wait_for_review" in offered and self.rng.random() < 0.2:
@@ -248,7 +250,7 @@ class Walk:
         forge: Forge = self.worlds[project]["forge"]
         if item and loop:
             weights.update({"go": 3, "answer": 2, "abandon": 1, "go-stale": 1})
-            weights.update({"plain-yes": 2, "wait": 2})
+            weights.update({"plain-yes": 2, "wait": 2, "question": 2})
             if loop.new_project:
                 weights.update({"done": 2})
             if item.scope != "general":  # conversations aren't named by number
@@ -264,6 +266,28 @@ class Walk:
         elif action == "done" and loop:
             # The operator says a new project is ready; no entry was added.
             self.transport.receive(DON, "done", thread=loop.thread)
+        elif action == "question" and loop:
+            # L5: a question never changes the item it's asked about.
+            before = (item.position, loop.wait, loop.rev, loop.pr, loop.branch)
+            self.transport.receive(DON, f"why {len(self.steps)}?", thread=loop.thread)
+            after_item = self.world["store"].work_item(item.id)
+            after = loop_of(after_item)
+            if (
+                item.scope != "general"
+                and item.position == WAITING
+                and loop.wait in (GO_AHEAD, ANSWER, MERGE)
+            ):
+                now = (
+                    after_item.position,
+                    after.wait,
+                    after.rev,
+                    after.pr,
+                    after.branch,
+                )
+                assert now == before, (
+                    f"questions_change_nothing: {before} -> {now}: "
+                    f"seed {self.seed}, steps {self.steps}"
+                )
         elif action == "chat":
             # A top-level message: a conversation of its own (L1, L5).
             self.transport.receive(DON, f"thinking aloud {len(self.steps)}")

nisse-dev/tests/test_loop_talk.py

@@ -0,0 +1,163 @@
+"""Conversation on the new loop (M2.7, L5, #42, #77): questions answered
+without changing the item, revisions that say what changed, progress in
+prose at a readable rate, raw tool activity on request, and a note for a
+message that can't be read yet."""
+
+from pathlib import Path
+from typing import Any
+
+from test_loop import DON, RESTATED, FakeGitea, Harness, ScriptedModel, call, issue
+
+from nisse_dev.canonical import AssistantText
+from nisse_dev.loop.items import ANSWER, GO_AHEAD, WAITING, loop_of
+
+
+class Clock:
+    def __init__(self) -> None:
+        self.now = 1000.0
+
+    def __call__(self) -> float:
+        return self.now
+
+
+def harness(tmp_path: Path, *turns: list[Any], **kw: Any) -> Harness:
+    return Harness(tmp_path, ScriptedModel(*turns), FakeGitea(issue()), **kw)
+
+
+# --- questions never change state (#77) -------------------------------------
+
+
+def test_a_question_about_a_restatement_leaves_it_up(tmp_path: Path) -> None:
+    h = harness(
+        tmp_path,
+        RESTATED,
+        [call("reply", text="Because text.py already holds the string helpers.")],
+        [call("ask_human", question="started; anything else?")],
+    )
+    h.agent.intake()
+    h.say("Why text.py?")
+    loop = loop_of(h.item())
+    assert (h.item().position, loop.wait, loop.rev) == (WAITING, GO_AHEAD, 1)
+    assert not loop.question and not loop.started
+    assert h.posted()[-1] == "Because text.py already holds the string helpers."
+    h.say("go")  # still bound to rev-1
+    assert loop_of(h.item()).started
+
+
+def test_a_question_back_keeps_the_agents_own_question_open(tmp_path: Path) -> None:
+    h = harness(
+        tmp_path,
+        [call("ask_human", question="One function or two?")],
+        [call("reply", text="One handles words, two would split lines too.")],
+    )
+    h.agent.intake()
+    h.say("What would the second one do?")
+    loop = loop_of(h.item())
+    assert (loop.wait, loop.note) == (ANSWER, "One function or two?")
+
+
+def test_a_question_that_isnt_answered_still_goes_back(tmp_path: Path) -> None:
+    h = harness(
+        tmp_path,
+        RESTATED,
+        [call("restate", text="sneaky v2", changed="x")],  # not offered
+        [AssistantText(text="hmm", model="m")],
+        [AssistantText(text="hmm", model="m")],  # prose twice: the run fails
+    )
+    h.agent.intake()
+    h.say("why?")
+    loop = loop_of(h.item())
+    # restate isn't offered in a question run: no new revision.
+    assert (loop.wait, loop.rev) == (GO_AHEAD, 1)
+    assert h.posted()[-1].startswith("I couldn't answer that")
+
+
+# --- explanations ------------------------------------------------------------
+
+
+def test_a_revision_says_what_changed(tmp_path: Path) -> None:
+    h = harness(
+        tmp_path,
+        RESTATED,
+        [call("restate", text="count_words in words.py", changed="")],
+        [
+            call(
+                "restate",
+                text="count_words in words.py",
+                changed="a module of its own, as you asked",
+            )
+        ],
+    )
+    h.agent.intake()
+    h.say("put it in its own module")
+    loop = loop_of(h.item())
+    assert loop.rev == 2
+    assert "Changed from rev-1: a module of its own, as you asked" in h.posted()[-1]
+
+
+# --- progress and details (#42) ----------------------------------------------
+
+
+def test_progress_is_posted_at_a_readable_rate(tmp_path: Path) -> None:
+    clock = Clock()
+
+    class Ticking(ScriptedModel):
+        def complete(self, events, tools, model, system=None):  # type: ignore[no-untyped-def]
+            clock.now += 30  # each turn takes a while
+            return super().complete(events, tools, model, system)
+
+    h = Harness(
+        tmp_path,
+        Ticking(
+            [
+                AssistantText(text="Looking at text.py first.", model="m"),
+                call("list_dir", path="."),
+            ],
+            [
+                AssistantText(text="Reading the tests too.", model="m"),
+                call("list_dir", path="tests"),
+            ],
+            [
+                AssistantText(text="x" * 1000, model="m"),
+                call("list_dir", path="."),
+            ],
+            [call("restate", text="I'll add count_words.", changed="")],
+        ),
+        FakeGitea(issue()),
+        clock=clock,
+    )
+    h.agent.intake()
+    said = h.posted()
+    assert "Looking at text.py first." in said
+    assert "Reading the tests too." not in said  # 30 s later: folded away
+    long = [p for p in said if p.startswith("xxx")]
+    assert long and len(long[0]) < 420 and long[0].endswith(" …")  # 60 s on
+
+
+def test_details_shows_the_last_tool_calls(tmp_path: Path) -> None:
+    h = harness(
+        tmp_path,
+        [
+            call("list_dir", path="src"),
+            call("read_file", path="text.py"),
+            call("restate", text="I'll add count_words.", changed=""),
+        ],
+    )
+    h.agent.intake()
+    h.say("details")
+    shown = h.posted()[-1]
+    assert shown.startswith("The last tool calls on #14:")
+    assert "list_dir(src)" in shown and "read_file(text.py)" in shown
+    assert loop_of(h.item()).wait == GO_AHEAD  # nothing changed
+
+
+def test_a_message_mid_run_is_acknowledged(tmp_path: Path) -> None:
+    h = harness(tmp_path, RESTATED)
+    h.agent.intake()
+    h.agent._running = True  # as if a driver run were under way
+    h.agent._active_thread = "elsewhere"
+    h.agent._active_name = "#15"
+    h.transport.receive(DON, "one more thing", thread=h.thread())
+    assert "Noted; I'm in the middle of #15" in h.posted()[-1]
+    h.transport.receive(DON, "and another", thread="elsewhere")
+    assert h.posted()[-1] == "Noted; I'll read it when this turn ends."