Recall the transcript's user turns with the chat arrow keys

[realtonyyoung]

Closes #1503 — AI-3807

What & why

↑/↓ in the desktop chat composer recalled only prompts sent from that composer, and opening a session from the rail rebuilds its workspace, so a session with earlier messages had nothing to recall. Recall now walks the input the transcript records as submitted (prompts, /commands, !commands), followed by this composer's sends the transcript has not echoed yet. Whether a send is echoed is the chat queue's existing acknowledgement, so replays, reworded receipts and early echoes neither drop nor double one.

Where to look

ComposerHistory re-finds the shown entry on each keystroke instead of trusting an index, because arrivals, evictions and replays move entries mid-recall. In a shared remote session, ↑ also recalls other participants' input, since it follows the transcript.

Verification

• --treenode-filter '/*/*/ComposerHistoryTests/*': 14/14 passed
• '/*/*/ChatTabViewModelTests/*': 96/96 passed
• '/*/*/ChatTabViewSmokeTests/*': 62/62 passed
• Removing the feed-switch clear fails Another_transcript_recalls_nothing_sent_while_reading_the_last

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Composer history includes nonblank messages recorded in the transcript, including slash commands. Submitted prompts can be recalled before they appear in the transcript without being duplicated when echoed.
  • Recall navigation stays aligned as messages arrive or older entries are removed, and lets you move between past turns and your draft.
  • Switching transcript feeds or resetting a transcript clears its history and pending prompts.
  • Attachment details are excluded from recalled prompts, and slash commands are matched consistently when acknowledged.

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📥 Commits

Reviewing files that changed from the base of the PR and between 4859b1c and 1513f9a.

📒 Files selected for processing: 7

• src/Capacitor.App/ViewModels/ChatTabViewModel.cs
• src/Capacitor.App/ViewModels/ComposerHistory.cs
• src/Capacitor.Cli.Core/Harness/Claude/ClaudeChatRules.cs
• src/Capacitor.Cli.Core/LocalIpc/AttachmentTrailer.cs
• test/Capacitor.App.Tests.Unit/ChatTabViewModelTests.cs
• test/Capacitor.App.Tests.Unit/ComposerHistoryTests.cs
• test/Capacitor.Cli.Core.Tests.Unit/LocalIpc/AttachmentTrailerTests.cs

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📝 Walkthrough

Composer recall now uses user turns observed in the transcript and sends that have not yet appeared there. The view model clears recall history when the feed changes or the transcript resets. Attachment trailers are stripped from observed prompts.

Changes: Composer recall

Layer / File(s)	Summary
Attachment trailer stripping src/Capacitor.Cli.Core/LocalIpc/AttachmentTrailer.cs, src/Capacitor.Cli.Core/Harness/Claude/ClaudeChatRules.cs, test/Capacitor.Cli.Core.Tests.Unit/LocalIpc/AttachmentTrailerTests.cs	AttachmentTrailer.Strip removes a complete trailing attachment trailer and trims whitespace before it. ClaudeChatRules uses this method. Tests cover trailer-only input, typed prompts, and incomplete trailers.
History recording and navigation src/Capacitor.App/ViewModels/ComposerHistory.cs, test/Capacitor.App.Tests.Unit/ComposerHistoryTests.cs	ComposerHistory observes transcript turns and combines them with unechoed sends for recall. It handles blank turns, adjacent duplicates, capacity, changing entries during navigation, and clearing history. Tests cover these behaviors.
Transcript history integration src/Capacitor.App/ViewModels/ChatTabViewModel.cs, src/Capacitor.App/ViewModels/QueuedChatMessage.cs, test/Capacitor.App.Tests.Unit/ChatTabViewModelTests.cs	ChatTabViewModel tracks sends until transcript acknowledgement and supplies unechoed sends during recall. It clears history when feeds change or transcripts reset. Slash-command matching accepts normalized prompts. Tests cover transcript recall, send echoes, replayed turns, and feed changes.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Low

Sequence Diagram(s)

sequenceDiagram
  participant Transcript
  participant ChatTabViewModel
  participant ComposerHistory
  Transcript->>ChatTabViewModel: Provide submitted input text
  ChatTabViewModel->>ComposerHistory: Observe transcript text
  ChatTabViewModel->>ComposerHistory: Request recall with unechoed send texts
  ComposerHistory-->>ChatTabViewModel: Return recalled text

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Suggested reviewers: alexeyzimarev

Merge Risk: ⚪ Minimal · up to 1513f

Composer recall is ready to merge after normal checks. A prompt ending in text that resembles an attachment trailer may lose that paragraph when recalled, but this narrow case does not block the change.

Security architecture risk: 🔵 Low · up to 1513f

Recall can now insert historical session input into the composer, but sending still requires a separate action and existing access checks. No new execution or authorization bypass was established. Remaining uncertainty concerns input attribution and reconciliation across session changes.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The demonstrated new exposure is transcript-derived text becoming editable composer input in the current tab. Recalled slash or bang commands can reach the existing send path after explicit submission; recall itself neither executes them nor grants additional authority.

Trust Boundaries and Controls

• observed — Up and Down change composer text and return without sending. Enter separately invokes SendCommand when executable. Send eligibility requires available text input, a non-read-only participant, no active usage-limit question and nonblank text.

Resilience and Maintainability Implications

• observed — Rejected sends leave the unechoed recall list, whereas cancellation or transport exceptions remain unconfirmed. Teardown invalidates feed generation and cancels the lifetime before disposing input; Apply rejects stale generations.
• observed — Retaining and rebasing this tab's pending queue entries across feed changes predates this PR. The PR adds clearing for recall-specific state. Pending matching still uses generation, offset and text rather than durable session identity; no new disclosure or execution path was established from that existing behavior.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 44.44% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 54 functions across 8 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the primary change: using chat arrow keys to recall user turns from the transcript.
Linked Issues check		Issue #1503 requires desktop chat ↑/↓ recall of user input already shown in the session, newest first. ComposerHistory observes transcript input and supports older/newer navigation. `ChatTabViewMode…
Out of Scope Changes check		The changes stay within issue #1503. ComposerHistory, transcript observation, acknowledgement matching, attachment-trailer stripping, feed reset handling, and related tests support session input rec…

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PR Summary by Qodo

Recall transcript user turns with chat arrow keys

🐞 Bug fix 🧪 Tests 🕐 20-40 Minutes

AI Description

• Make previously displayed user turns available to ↑/↓ recall, including turns from other
 participants.
• Rebuild recall history when the transcript resets or the chat switches feeds.
• Preserve active recall as new turns arrive and avoid duplicating sent prompts echoed in the
 transcript.

Diagram

graph TD
  F["Transcript Feed"] --> V["Chat Tab"] -->|"observe or clear"| H["Composer History"] -->|"recalled text"| C["Chat Composer"]
  C -->|"send"| S["Send Action"] -->|"record"| H
  C -->|"arrow keys"| H

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High-Level Assessment

Extending the existing bounded composer history with transcript observations is appropriate: it reuses the established recall behavior while resetting alongside the displayed feed. A separate transcript-history store would duplicate navigation and synchronization logic.

Files changed (4) +100 / -8

Bug fix (2) +32 / -8

ChatTabViewModel.csKeep recall history aligned with the displayed transcript +3/-0

Keep recall history aligned with the displayed transcript

• Observes displayed user-message events for recall and clears history when switching feeds or applying a transcript reset. Shell-command events remain outside composer history.

src/Capacitor.App/ViewModels/ChatTabViewModel.cs

ComposerHistory.csSupport transcript observations without disrupting recall +29/-8

Support transcript observations without disrupting recall

• Adds observation and clearing alongside locally recorded prompts. Consecutive echoes collapse into one entry, blank observations are ignored, and the cursor stays aligned when an arrival evicts the oldest entry.

src/Capacitor.App/ViewModels/ComposerHistory.cs

Tests (2) +68 / -0

ChatTabViewModelTests.csVerify recall after transcript loading and rewriting +27/-0

Verify recall after transcript loading and rewriting

• Adds a view-model test confirming that an opened session recalls existing user turns and that a rewritten transcript replaces, rather than duplicates, its history.

test/Capacitor.App.Tests.Unit/ChatTabViewModelTests.cs

ComposerHistoryTests.csCover observed turns and recall cursor edge cases +41/-0

Cover observed turns and recall cursor edge cases

• Tests echo deduplication, uninterrupted navigation during observations, eviction while recalling the oldest entry, and clearing history.

test/Capacitor.App.Tests.Unit/ComposerHistoryTests.cs

[qodo-code-review]

Code Review by Qodo

🐞 Bugs (0) 📘 Rule violations (0) 📎 Requirement gaps (0) 🔗 Cross-repo conflicts (0) 📜 Skill insights (0)

1. Repeated arrivals can crash chat recall ✓ Resolved

Description

Observe decrements _cursor on every capacity eviction while _shown is set, even after the
displayed entry has already been evicted and the cursor is -1. If two distinct user turns arrive
while the oldest of 100 entries is recalled, pressing ↓ indexes _entries[-1] in Newer and
throws.

Code

src/Capacitor.App/ViewModels/ComposerHistory.cs[25]

+        if (Append(text) && _shown is not null) _cursor--;

Relevance

●●● Strong

ComposerHistory cursor boundary failures resemble previously accepted navigation correctness fixes.

PR-#915

ⓘ Recommendations generated based on similar findings in past PRs

Evidence

Append reports each capacity eviction; the repeated decrement can produce -2, while Newer
increments and indexes without rejecting negative indices. The chat view invokes this path on
transcript arrivals and arrow-key recall.

src/Capacitor.App/ViewModels/ComposerHistory.cs[23-25]
src/Capacitor.App/ViewModels/ComposerHistory.cs[46-50]
src/Capacitor.App/ViewModels/ComposerHistory.cs[63-69]
src/Capacitor.App/ViewModels/ChatTabViewModel.cs[249-256]
src/Capacitor.App/ViewModels/ChatTabViewModel.cs[965-968]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
Repeated evictions while the evicted entry remains displayed move the recall cursor below its valid `-1` sentinel, making ↓ throw.
## Fix Focus Areas
- src/Capacitor.App/ViewModels/ComposerHistory.cs[23-25]
- test/Capacitor.App.Tests.Unit/ComposerHistoryTests.cs[102-112]
## Recommended Fix
Clamp the cursor at `-1` when adjusting it for an eviction. Add a test that recalls the oldest entry, observes at least two distinct turns at capacity, then presses ↓.

ⓘ Copy this prompt and use it to remediate the issue with your preferred AI generation tools

---

2. Shared-session prompts can appear twice ✓ Resolved

Description

Observe suppresses a sent prompt's transcript echo only when its text matches the last history
entry. If another participant's user turn arrives between Record and that echo, the intervening
turn separates the identical texts and ↑ encounters the locally sent prompt twice.

Code

src/Capacitor.App/ViewModels/ComposerHistory.cs[R23-25]

+    public void Observe(string text) {
+        if (string.IsNullOrWhiteSpace(text)) return;
+        if (Append(text) && _shown is not null) _cursor--;

Relevance

●●● Strong

Shared-session ordering and transcript echo correctness issues align with accepted chat-state fixes.

PR-#889
PR-#915

ⓘ Recommendations generated based on similar findings in past PRs

Evidence

Accepted sends call Record ahead of transcript acknowledgement, every displayed ordinary user turn
calls Observe, and Append compares only with the immediately preceding entry. The server queue
explicitly handles other clients' inputs in the same session.

src/Capacitor.App/ViewModels/ChatTabViewModel.cs[645-653]
src/Capacitor.App/ViewModels/ChatTabViewModel.cs[698-718]
src/Capacitor.App/ViewModels/ChatTabViewModel.cs[950-968]
src/Capacitor.App/ViewModels/ComposerHistory.cs[63-69]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
In shared sessions, another user's turn can arrive between a local history record and its transcript echo, defeating last-entry-only deduplication.
## Fix Focus Areas
- src/Capacitor.App/ViewModels/ComposerHistory.cs[15-25]
- src/Capacitor.App/ViewModels/ComposerHistory.cs[63-69]
- src/Capacitor.App/ViewModels/ChatTabViewModel.cs[950-968]
## Recommended Fix
Track outstanding locally recorded prompts until their corresponding transcript receipts arrive, and reconcile an echo with its existing history entry even if other turns intervened. Test the local-send, foreign-turn, local-echo sequence.

ⓘ Copy this prompt and use it to remediate the issue with your preferred AI generation tools

---

3. Sent commands vanish from recall on replay ✓ Resolved

Description

_history.Clear() removes locally recorded prompts, but replay restores history only for ordinary
displayed user messages, not shell rows or hidden slash-command receipts. After a feed switch or
transcript reset, a previously sent shell or slash command is no longer available through ↑ even
though Record added it when sent.

Code

src/Capacitor.App/ViewModels/ChatTabViewModel.cs[911]

+                _history.Clear();

Relevance

●●● Strong

Accepted reset-state regressions closely match prior accepted transcript/session cleanup fixes.

PR-#889
PR-#1467

ⓘ Recommendations generated based on similar findings in past PRs

Evidence

Successful sends are recorded before replay clears the history. Claude command fixtures show slash
commands can have only a submitted-input receipt, while shell commands display in a separate branch;
neither branch repopulates history.

src/Capacitor.App/ViewModels/ChatTabViewModel.cs[650-651]
src/Capacitor.App/ViewModels/ChatTabViewModel.cs[787-800]
src/Capacitor.App/ViewModels/ChatTabViewModel.cs[906-916]
src/Capacitor.App/ViewModels/ChatTabViewModel.cs[950-968]
test/Capacitor.Cli.Core.Tests.Unit/Harness/Claude/ClaudeChatRulesTests.cs[13-23]
test/Capacitor.Cli.Core.Tests.Unit/Harness/Claude/ClaudeChatRulesTests.cs[43-51]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
Clearing history for transcript replay permanently drops locally sent shell and hidden slash commands because neither replay path observes them.
## Fix Focus Areas
- src/Capacitor.App/ViewModels/ChatTabViewModel.cs[787-789]
- src/Capacitor.App/ViewModels/ChatTabViewModel.cs[908-911]
- src/Capacitor.App/ViewModels/ChatTabViewModel.cs[950-968]
## Recommended Fix
Rebuild history from both visible shell user turns and relevant submitted-command receipts, preserving the sent prompt's recall text and avoiding duplicate entries when its receipt arrives. Cover reset and feed-switch replay in tests.

ⓘ Copy this prompt and use it to remediate the issue with your preferred AI generation tools

---

4. Temp-file rewrites bypass test helpers ✗ Dismissed

Description

Recall_reaches_the_user_turns_the_transcript_shows rewrites a file beneath the injected temporary
directory with File.WriteAllLines instead of a TempDir helper. When the rewritten transcript is
exercised, this direct filesystem mutation bypasses the required helper API for all state under
Tmp.

Code

test/Capacitor.App.Tests.Unit/ChatTabViewModelTests.cs[1520]

+            File.WriteAllLines(path, [UserLine.Replace("hello", "rewritten")]);

Relevance

●●● Strong

Recent test precedent accepts enforcing TempDir helper usage for temporary filesystem mutations.

PR-#1333

ⓘ Recommendations generated based on similar findings in past PRs

Evidence

PR Compliance ID 2767472 requires tests to use TempDir members for paths under a TempDir root.
The test receives Tmp through [TempDir], creates path with Tmp.CreateFile, and then directly
rewrites that path with File.WriteAllLines.

Rule 2767472: Use TempDir helper for all temporary filesystem state in tests
test/Capacitor.App.Tests.Unit/ChatTabViewModelTests.cs[1509-1520]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
The test writes directly to a path under the injected `TempDir` with `File.WriteAllLines`, while temporary filesystem state must be created or rewritten through `TempDir` helpers.

## Fix Focus Areas
- test/Capacitor.App.Tests.Unit/ChatTabViewModelTests.cs[1520-1520]

## Recommended Fix
Replace the direct `File.WriteAllLines` call with the appropriate `TempDir` file helper, preserving the rewritten transcript contents while keeping all temporary filesystem mutations within the helper API.

ⓘ Copy this prompt and use it to remediate the issue with your preferred AI generation tools

---

View medium (1)

5. A feed reset strands recalled text ✓ Resolved

Description

_history.Clear() ends navigation without updating ComposerText, leaving the recalled entry
displayed but no longer recognized as a recall. If a feed resets or switches while ↑/↓ navigation is
active, ↓ cannot restore the stashed draft, and ↑ cannot restart from the still-nonblank composer
after replay.

Code

src/Capacitor.App/ViewModels/ChatTabViewModel.cs[911]

+                _history.Clear();

Relevance

●●● Strong

Navigation invalidation bugs are accepted in this area, including ComposerHistory state handling.

PR-#915
PR-#1467

ⓘ Recommendations generated based on similar findings in past PRs

Evidence

Both new clear calls leave composer text untouched. Clear discards _shown, and Older refuses
to begin navigation from nonblank text while Newer requires _shown, so the previously recalled
text blocks both directions.

src/Capacitor.App/ViewModels/ChatTabViewModel.cs[249-263]
src/Capacitor.App/ViewModels/ChatTabViewModel.cs[787-800]
src/Capacitor.App/ViewModels/ChatTabViewModel.cs[906-916]
src/Capacitor.App/ViewModels/ComposerHistory.cs[28-51]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
A feed clear discards active recall state while leaving its text in the composer, so arrow navigation cannot resume or restore the stashed draft.
## Fix Focus Areas
- src/Capacitor.App/ViewModels/ChatTabViewModel.cs[787-789]
- src/Capacitor.App/ViewModels/ChatTabViewModel.cs[908-911]
- src/Capacitor.App/ViewModels/ComposerHistory.cs[28-31]
## Recommended Fix
Before clearing history, detect an unedited active recall and restore its stashed draft in the composer; otherwise preserve user edits. Add a reset-during-recall test.

ⓘ Copy this prompt and use it to remediate the issue with your preferred AI generation tools

---

Context sources

✅ Tickets: 🎫 Recall a session's earlier messages with the arrow keys in the desktop chat

✅ Compliance rules (platform): 63 rules

✅ Cross-repo context — repo relationships

Review mode: Auto: ⚖️ Balanced: Behavioral stateful history changes across UI paths warrant careful single-pass review.

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Inline comments:
Review comments at @src/Capacitor.App/ViewModels/ComposerHistory.cs:
- Line 25: Update ComposerHistory’s Observe and Record handling so turns
returned by the initial transcript read are ordered by transcript position ahead
of sends completed while that read was in flight, preventing duplicate history
entries and ensuring ↑ recalls the newest turn first. Add a test that delays the
initial read until a send completes and verifies recall order.

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• src/Capacitor.App/ViewModels/ChatTabViewModel.cs
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Review comments at @src/Capacitor.App/ViewModels/ComposerHistory.cs:
- Line 48: Update ComposerHistory.Clear and its caller in
ChatTabViewModel.SwitchFeed so clearing history for a feed reset preserves
pending sends, but switching to a different feed discards them. Ensure the new
feed’s history cannot recall prompts submitted in the previous feed.
- Line 49: Update the cursor assignment in ComposerHistory.Clear so it preserves
the recalled send’s position when Clear retains that entry; use the
detached-entry position only when Clear removes the recalled entry.

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Review comments at @src/Capacitor.App/ViewModels/ChatTabViewModel.cs:
- Around line 247-259: Update `QueuedChatMessage.Matches` so slash-command sends
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Inline comments:
Review comments at @src/Capacitor.App/ViewModels/ChatTabViewModel.cs:
- Line 985: Update the history recording around _history.Observe(text) to
preserve the raw transcript text for attachment receipt matching while storing a
trailer-free prompt for recall. Apply the same trailer removal to historical
transcript turns so pressing ↑ never loads an attachment trailer into the
composer.
- Line 822: Update the feed-switch path in SwitchFeed to call
_history.EndNavigation() instead of only clearing history, so navigation state
such as _shown is reset when the feed changes. Keep reset behavior separate and
preserve active recall for replay.

Review comments at @test/Capacitor.App.Tests.Unit/ChatTabViewModelTests.cs:
- Line 1635: Update the replay test around File.WriteAllLines so the initial
transcript includes a distinct turn that is absent from the rewritten two-turn
transcript. Assert that replay removes the distinct turn and that the newer send
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📒 Files selected for processing: 4

• src/Capacitor.App/ViewModels/ChatTabViewModel.cs
• src/Capacitor.App/ViewModels/QueuedChatMessage.cs
• test/Capacitor.App.Tests.Unit/ChatTabViewModelTests.cs
• test/Capacitor.App.Tests.Unit/ComposerHistoryTests.cs

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