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_messages_tokens_with_margin

Estimate tokens for messages, applying the configured safety margin.

estimate_tokens

Estimate token count for a string.

format_removed_messages_as_transcript

Format removed messages into a compact transcript for summary generation. Extracts user messages, assistant text, and tool call names only. Truncates each message to keep the transcript concise.

truncate_output

Truncate tool output based on line count and byte limits.