# Research – Compression/Compaction Cleanup Verification

**Date:** 2026-02-09
**Owner:** claude
**Phase:** Research
**git_commit:** a454860be6cd2c8c3d1a1a35f9fb9beb7edc5685
**last_updated:** 2026-02-09 13:54:38
**last_updated_by:** claude
**tags:** [cleanup, compression, compaction, pydantic-ai, tinyagent, migration]

## Goal

Verify that all compression, compaction, token pruning, and rolling summary logic from the old pydantic-ai implementation has been removed after migrating to tinyagent. Identify any dangling or dead code related to these features.

## Findings

### Summary: No Dangling Compression Logic Found

The codebase has been **successfully cleaned** of all pydantic-ai compression and compaction features. No functional compression, compaction, token pruning, or rolling summary logic remains.

### Files Referenced by Search (All Legitimate)

| File | Status | Purpose |
|------|--------|---------|
| `src/tunacode/utils/messaging/token_counter.py` | **ACTIVE** | Token estimation for UI budgeting and context window display |
| `src/tunacode/ui/model_display.py` | **ACTIVE** | Compact display formatting for model names in UI |
| `scripts/preview_tool_panels.py` | **SCRIPT** | Development preview script, not production code |
| `src/tunacode/ui/renderers/tools/base.py` | **ACTIVE** | `truncate_content()` for UI display purposes |
| `src/tunacode/ui/renderers/panels.py` | **ACTIVE** | `_truncate_content()` for UI display purposes |
| `src/tunacode/core/agents/resume/sanitize.py` | **ACTIVE** | Removes dangling tool calls (cleanup, not compression) |
| `src/tunacode/configuration/limits.py` | **ACTIVE** | `get_max_tokens()` for output length limits |

### What Was Removed (Confirmed Deleted)

The following files and features from pydantic-ai **no longer exist**:

- `src/tunacode/core/compaction.py` - Dynamic prune thresholds
- `src/tunacode/core/agents/agent_components/orchestrator/*.py` - Parallel tool execution
- `src/tunacode/core/agents/agent_components/streaming.py` - pydantic-ai specific streaming
- Tool output pruning logic
- Rolling summary generation
- Token pruning/compaction logic

### Minor Terminology Issues (Non-Critical)

1. **`token_counter.py:33`** - Contains a comment mentioning "compaction heuristics" but no actual compaction code exists
2. **`sanitize.py:182`** - Uses "prune" terminology for cleanup (removing dangling tool calls), not compression
3. **JOURNAL.md** - Contains references to deleted files (`prune.py`, `summary.py`, `compaction.py`) from previous development phases

## Key Patterns / Solutions Found

### Pattern: Token Counting for UI (Legitimate)

The `token_counter.py` module is **actively used** for:
- UI token budgeting in `src/tunacode/ui/app.py:376`
- Context window usage display
- **Not** used for message compression or truncation

### Pattern: UI Truncation (Legitimate)

The `truncate_content()` functions are **display-only**:
- Used in tool panel rendering
- Truncate output for visual fit, not token management
- No impact on agent message history

### Pattern: Cleanup vs Compression (Terminology)

The term "prune" is used in two contexts:
1. **Removed**: Token/message compression for context management
2. **Active**: Cleanup of dangling tool calls in resume/sanitize logic

## Knowledge Gaps

None identified. The cleanup appears complete.

## References

### Code References (permalinks)

- `src/tunacode/utils/messaging/token_counter.py` - Token estimation for UI (https://github.com/alchemiststudiosDOTai/tunacode/blob/a454860be6cd2c8c3d1a1a35f9fb9beb7edc5685/src/tunacode/utils/messaging/token_counter.py)
- `src/tunacode/core/agents/resume/sanitize.py` - Tool call cleanup (https://github.com/alchemiststudiosDOTai/tunacode/blob/a454860be6cd2c8c3d1a1a35f9fb9beb7edc5685/src/tunacode/core/agents/resume/sanitize.py)
- `src/tunacode/ui/model_display.py` - Model name formatting (https://github.com/alchemiststudiosDOTai/tunacode/blob/a454860be6cd2c8c3d1a1a35f9fb9beb7edc5685/src/tunacode/ui/model_display.py)

### Research Documents

- `memory-bank/research/2026-02-09_11-33-09_pydantic-ai_to_tinyagent_migration_and_recent_changes.md` - Migration documentation listing removed features

### Delta/Change Logs

- `src/tunacode/core/compaction.py` - DELETED (confirmed removed)
- `src/tunacode/core/agents/agent_components/orchestrator/` - DELETED (confirmed removed)
