[BUG] No way to view pre-compaction conversation history — Ctrl+O/Ctrl+E broken, thinking blocks hidden

[scapeshift-ojones]

Summary

After context compaction, users cannot access their previous conversation history. The full transcript is preserved in transcript.jsonl on disk, but there is no working UI to view it. This causes effective data loss — task context, reasoning chains, error messages, and file modifications are irretrievably lost from the user's perspective.

Three compounding bugs make this worse:

1. Ctrl+O does the wrong thing — help text says "toggle verbose output" but it triggers transcript mode, which itself is broken
2. Transcript mode hides all past thinking blocks — hidePastThinking is hardcoded to true, showing only the final (least useful) thinking block
3. Ctrl+E is unresponsive after compaction — no fallback to view history

Root Cause Analysis

Ctrl+O keybinding collision

The ? help menu shows Ctrl+O as "Toggle verbose output" but pressing it activates transcript mode — a completely different full-screen historical view. There is no keyboard shortcut to actually toggle real-time verbose output during execution.

Note: Keybindings are now configurable via ~/.claude/keybindings.json, so terminal multiplexer conflicts (tmux, zellij) can be worked around by remapping. However, the mislabeled help text and broken transcript mode remain regardless of binding.

Transcript mode hides thinking blocks

Source analysis of cli.js (v2.1.17) by @carrotRakko on #16965:

hidePastThinking: !0  // hardcoded to true in transcript mode

• Only the very last thinking block is displayed; all others get hideInTranscript: true
• The last thinking block is typically "Done. Reporting to user." — the least useful one
• Intermediate thinking blocks containing actual reasoning, debugging logic, and decision-making are hidden
• In normal mode, hidePastThinking is not passed (defaults to false) — so this is specific to the transcript view

Proposed fix (from @carrotRakko): Show all thinking blocks since the last user input, rather than all-or-nothing.

Community patch exists: aleks-apostle/claude-code-patches#9

Post-compaction context destruction

After compaction:

• Claude reconstructs context incorrectly from compacted summaries (confirmed: Claude responded "Based on the compacted summary, we were discussing corrections to the CLAUDE.md documentation" — which was wrong)
• File operations in progress may be corrupted (CLAUDE.md truncated from 860 to 424 lines during compaction on [BUG] Conversation compaction loses entire history, ctrl+e unresponsive #19888)
• Error states include "max compactions exceeded" and "NO compactable messages available"
• transcript.jsonl preserves the full history, but there is no in-TUI viewer

Steps to Reproduce

Ctrl+O misbehavior

1. Start a Claude Code session
2. Give a multi-step task that triggers tool use
3. Press Ctrl+O — observe transcript mode activates (not verbose toggle)
4. In transcript mode, note that only the last thinking block is visible

Post-compaction data loss

1. Run a long session until context compaction triggers
2. After compaction, press Ctrl+O — only compacted summary is visible
3. Press Ctrl+E — no response or empty view
4. Full conversation history is gone from the UI despite existing in transcript.jsonl

Expected Behavior

• Users should be able to browse their full conversation history, including pre-compaction messages
• Thinking blocks should be visible in transcript mode (at minimum, all blocks from the current turn)
• Ctrl+O help text should accurately describe its behavior
• Help text for Ctrl+O should match its actual behavior

Impact

• Effective data loss: Hours of conversation context, debugging steps, file modification history become inaccessible
• Cannot audit Claude's reasoning: Hidden thinking blocks prevent users from understanding why Claude made specific decisions
• Cannot recover from bad compaction: When compaction corrupts context, there's no way to review what was lost
• Workflow disruption: Help text mislabels Ctrl+O, so users expecting verbose toggle get transcript mode instead

Workarounds

1. grep raw JSONL files — transcript.jsonl contains everything, but requires manual parsing
2. Pre-compaction hooks — Community script by @EMarkODell auto-saves before each compaction
3. Cozempic — Open-source tool for context loss mitigation (deduplication, checkpointing to .memory/WORKING.md)
4. Community patch for thinking blocks: Update thinking patch for latest Claude Code aleks-apostle/claude-code-patches#9

Environment

• Versions affected: 2.0.8+ (scroll regression), 2.1.x+ (thinking blocks hidden), all current versions
• Platforms: macOS, Windows, Linux
• Terminals: All tested (Terminal.app, iTerm2, Ghostty, Windows Terminal, VS Code)

Consolidates These Issues

Issue	Title	👍
#14511	Ctrl+O triggers transcript view, not verbose toggle	6
#19888	Compaction loses entire history, Ctrl+E unresponsive	4
#16965	Cannot read past thinking blocks with Ctrl+O	3
#21188	View full conversation history in UI	0

Combined engagement: 13+ thumbs-up, 30+ comments, multi-platform.

These issues share a common theme: after compaction, users lose access to their conversation history, and the existing UI tools (Ctrl+O, Ctrl+E) don't work to recover it.

[scapeshift-ojones]

Related: #26123 (/resume broken — session history inaccessible since v2.1.31)

These two issues compound: a user who can't find their session (#26123) AND can't view pre-compaction history within it (#26125) has no path to recover past work.

They may also share a root cause — both involve broken summary/metadata generation that correlates with the ~Feb 4 token-reduction changes. Session summary generation stopped around the same time (#26123 Bug 1: all new entries have "summary": ""), suggesting the same upstream change may have degraded both session indexing and compaction quality.

[github-actions]

Found 3 possible duplicate issues:

1. [BUG] After compaction the terminal resets and i cannot scroll up and see what all were discussed, changed and done. #13446
2. Compaction clears screen - can't scroll up to see previous context #18204
3. Rewind history lost after compaction in sessions with many rewinds (branching tree) #24471

This issue will be automatically closed as a duplicate in 3 days.

• If your issue is a duplicate, please close it and 👍 the existing issue instead
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🤖 Generated with Claude Code

[github-actions]

This issue has been automatically closed as a duplicate of #13446.

If this is incorrect, please re-open this issue or create a new one.

🤖 Generated with Claude Code

[scapeshift-ojones]

Superseded by #27242 — comprehensive issue covering all three scenarios where conversation history becomes inaccessible:

1. Post-compaction (this issue's original scope)
2. Post-plan-mode "clear context" (new)
3. Branch navigation regression (new — right-arrow in /resume picker broken since ~v2.1.31)

JSONL analysis confirms all data is preserved in every scenario — this is purely a UI/rendering gap. #27242 consolidates 8 related issues with 29+ combined thumbs-up.

[github-actions]

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.