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5 changes: 4 additions & 1 deletion packages/types/src/tool-params.ts
Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,10 @@ export type ReadFileToolParams = ReadFileParams | LegacyReadFileParams
* Type guard to check if params are in legacy format.
*/
export function isLegacyReadFileParams(params: ReadFileToolParams): params is LegacyReadFileParams {
return "_legacyFormat" in params && params._legacyFormat === true
// Detect explicit flag (new code path) or bare `files` array (real legacy chat data)
const hasLegacyFlag = "_legacyFormat" in params && params._legacyFormat === true
const hasFilesArray = "files" in params && Array.isArray((params as unknown as Record<string, unknown>).files)
return hasLegacyFlag || hasFilesArray
}

export interface Coordinate {
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