Module context 

Context management — output truncation and history window management.

Structs

ContextManager

Manages the context window, truncating history when approaching token limits.

TruncationResult

Result of context truncation, used for async compression.

Functions

estimate_messages_tokens

Estimate tokens for a list of messages.

estimate_tokens

Estimate token count for a string. Uses a simple heuristic: ~4 chars per English token, ~2 chars per Chinese token. For mixed content, we use ~3 chars per token as a rough estimate.

truncate_output

Truncate tool output based on line count and byte limits.