PR #23048: fix(cli): preserve startup banner on terminal resize

• Repository: NousResearch/hermes-agent
• Author: vominh1919
• State: open | merged: False
• Link: https://github.com/NousResearch/hermes-agent/pull/23048

Description (problem / solution / changelog)

Problem

After starting the classic CLI in a small terminal window and then maximizing/resizing, the startup banner and right-side tool summary disappear. Only the bottom input prompt area remains visible.

Root cause: _recover_after_resize() calls _clear_prompt_toolkit_screen(app, rebuild_scrollback=True) which sends erase_screen() + ] (clear scrollback). The startup banner was printed before prompt_toolkit owned the chrome, so it lives in normal terminal scrollback — clearing it removes the banner permanently. _replay_output_history cannot reconstruct it because the banner was never added to _OUTPUT_HISTORY.

Fix

Replace the aggressive screen/scrollback clear with a minimal renderer reset:

• app.renderer.reset(leave_alternate_screen=False) — drops prompt_toolkit's cached screen + cursor state so the next redraw starts clean
• app.invalidate() — schedules a repaint
• original_on_resize() — recalculates layout for the new terminal size

This matches how bash/zsh/fish/vim/htop handle SIGWINCH — they never clear scrollback on resize.

Before vs After

Tests

Updated test_resize_rebuilds_scrollback_before_prompt_toolkit_redraw → test_resize_preserves_scrollback_and_resets_renderer to verify:

• renderer.reset() + invalidate() + original_on_resize() called in order
• erase_screen, write_raw, cursor_goto NOT called (scrollback preserved)

All 9 tests in tests/cli/test_cli_force_redraw.py pass.

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Fixes #22999

Changed files

• cli.py (modified, +21/-3)
• tests/cli/test_cli_force_redraw.py (modified, +15/-15)

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PR #23294: fix(cli): preserve startup scrollback on resize

• Repository: NousResearch/hermes-agent
• Author: LeonSGP43
• State: open | merged: False
• Link: https://github.com/NousResearch/hermes-agent/pull/23294

Description (problem / solution / changelog)

What does this PR do?

Preserve the classic CLI startup banner and tool summary during terminal resize recovery by resetting prompt_toolkit's renderer instead of wiping the physical terminal scrollback.

Related Issue

Fixes #22999

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

Changes Made

• update /Users/leongong/Desktop/LeonProjects/worktrees/hermes-agent/hermes-22999-cli-resize-banner/cli.py so resize recovery calls the original prompt_toolkit resize path first, then resets the renderer and invalidates for a clean repaint
• stop clearing physical scrollback during resize recovery so startup banner/tool summary content survives maximize and resize events
• update /Users/leongong/Desktop/LeonProjects/worktrees/hermes-agent/hermes-22999-cli-resize-banner/tests/cli/test_cli_force_redraw.py to assert the resize path preserves scrollback and still repaints the prompt chrome

How to Test

1. Run uv run --frozen pytest -q -o addopts='' tests/cli/test_cli_force_redraw.py
2. Start classic CLI mode in a narrow terminal and confirm the startup banner/tool summary are visible
3. Maximize or resize the terminal and confirm the startup area stays visible instead of being wiped away

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits (fix(scope):, feat(scope):, etc.)
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this fix/feature (no unrelated commits)
• I've run pytest tests/ -q and all tests pass
• I've added tests for my changes (required for bug fixes, strongly encouraged for features)
• I've tested on my platform: macOS 15.x

Documentation & Housekeeping

• I've updated relevant documentation (README, docs/, docstrings) — or N/A
• I've updated cli-config.yaml.example if I added/changed config keys — or N/A
• I've updated CONTRIBUTING.md or AGENTS.md if I changed architecture or workflows — or N/A
• I've considered cross-platform impact (Windows, macOS) per the compatibility guide — or N/A
• I've updated tool descriptions/schemas if I changed tool behavior — or N/A

Screenshots / Logs

• uv run --frozen pytest -q -o addopts='' tests/cli/test_cli_force_redraw.py → 9 passed
• uv run --frozen ruff check cli.py tests/cli/test_cli_force_redraw.py → passed

Changed files

• cli.py (modified, +16/-8)
• tests/cli/test_cli_force_redraw.py (modified, +9/-15)