Function ShouldActivateChainMode

coderd/x/chatd/chatopenai/responses.go:188–201

ShouldActivateChainMode reports whether a follow-up turn can use previous_response_id instead of replaying history. It requires store=true, a matching model config, meaningful trailing user input, non-plan mode, complete local tool state, and confirmation that tool results were sent to the provider.

(
	providerOptions fantasy.ProviderOptions,
	info ChainModeInfo,
	modelConfigID uuid.UUID,
	isPlanModeTurn bool,
)

// complete local tool state, and confirmation that tool results were sent to
// the provider.
func ShouldActivateChainMode(
	providerOptions fantasy.ProviderOptions,
	info ChainModeInfo,
	modelConfigID uuid.UUID,
	isPlanModeTurn bool,
) bool {
	return IsResponsesStoreEnabled(providerOptions) &&
		info.previousResponseID != "" &&
		info.contributingTrailingUserCount > 0 &&
		info.modelConfigID == modelConfigID &&
		!isPlanModeTurn &&
		!info.hasUnresolvedLocalToolCalls &&
		!info.providerMissingToolResults
}

// ResolveChainMode scans DB messages from the end to inspect the current
// trailing user turn and detect whether the immediately preceding assistant/tool