Struct MessagePairValidator 

pub struct MessagePairValidator;

Validates and repairs structural integrity of flat API message lists.

Implementations

impl MessagePairValidator

pub fn validate_tool_results_complete( tool_calls: &[Value], tool_results_by_id: &mut HashMap<String, Value>, )

Ensure every tool_call has an entry in results. Fill missing with synthetic errors.

This is the pre-batch-add guard. Call BEFORE iterating tool_calls to add results to history.

pub fn validate(messages: &[ApiMessage]) -> ValidationResult

Validate structural integrity of an API message list.

Single forward pass checking:

• Every tool_call ID from assistant messages has a matching tool result
• No orphaned tool results without a preceding tool_call
• Consecutive same-role messages (warning only)

pub fn repair(messages: &[ApiMessage]) -> (Vec<ApiMessage>, ValidationResult)

Validate and repair an API message list.

• MISSING_TOOL_RESULT: Insert synthetic tool result after the assistant’s tool results.
• ORPHANED_TOOL_RESULT: Remove the orphaned message.