When getContextWindowUsage returns null (no assistant messages yet, API
failure, or first request in session), the truncator was returning
untruncated output. This caused context overflow crashes on early
requests or when usage lookup failed.
Now applies conservative truncation (50k tokens) as fallback, preventing
prompt-too-long errors that crash sessions.
Include output tokens from last response in getContextWindowUsage calculation.
Output tokens become part of next request's input (conversation history), so
they must be counted to avoid overestimating remainingTokens. This aligns with
preemptive-compaction's calculation which already includes output tokens correctly.
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
Extract and generalize dynamic output truncation logic from grep-output-truncator.
Provides context window-aware truncation that adapts based on remaining tokens.
Features:
- truncateToTokenLimit(): Sync truncation with configurable header preservation
- getContextWindowUsage(): Get current context window usage from session
- dynamicTruncate(): Async truncation that queries context window state
- createDynamicTruncator(): Factory for creating truncator instance
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
Harsha Vardhan