<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e64ba-a74a-7d9a-9318-b511cefeec22,g:86a08ffd-68c8-45ec-bbe9-50698c20e158-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="https://xbrl.org/2023/arcrole/summation-item" xlink:type="simple" xlink:href="https://www.xbrl.org/2023/calculation-1.1.xsd#summation-item"/>
  <link:roleRef roleURI="http://www.agmit.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:type="simple" xlink:href="mitt-20260630.xsd#ConsolidatedBalanceSheetsUnaudited"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019e64ba-ad90-760d-89a5-a26111b78080" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019e64ba-ad90-77ed-a611-06cddebda349" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019e64ba-ad90-760d-89a5-a26111b78080" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019e64ba-ad90-77ed-a611-06cddebda349" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019e64ba-ad90-7826-a575-9e46380b16be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019e64ba-ad90-760d-89a5-a26111b78080" xlink:to="loc_us-gaap_OtherLiabilities_019e64ba-ad90-7826-a575-9e46380b16be" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes_019e64ba-ad90-7aef-9ee4-6619b3d6d942" xlink:href="mitt-20260630.xsd#mitt_DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019e64ba-ad90-760d-89a5-a26111b78080" xlink:to="loc_mitt_DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes_019e64ba-ad90-7aef-9ee4-6619b3d6d942" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedFinancings_019e64ba-ad90-758a-b9ce-fcb81ac14963" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedFinancings"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019e64ba-ad90-760d-89a5-a26111b78080" xlink:to="loc_us-gaap_CollateralizedFinancings_019e64ba-ad90-758a-b9ce-fcb81ac14963" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotes_019e64ba-ad90-7007-b1fc-3f4111ac912b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotes"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019e64ba-ad90-760d-89a5-a26111b78080" xlink:to="loc_us-gaap_SeniorNotes_019e64ba-ad90-7007-b1fc-3f4111ac912b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e64ba-ad90-75bf-9f6e-00f5edefc873" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e64ba-ad90-7860-b495-77650223f4eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e64ba-ad90-75bf-9f6e-00f5edefc873" xlink:to="loc_us-gaap_StockholdersEquity_019e64ba-ad90-7860-b495-77650223f4eb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019e64ba-ad90-7707-a1a8-7aaf2b96b9b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e64ba-ad90-75bf-9f6e-00f5edefc873" xlink:to="loc_us-gaap_Liabilities_019e64ba-ad90-7707-a1a8-7aaf2b96b9b4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019e64ba-ad90-75ec-9159-068f15b9270c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e64ba-ad90-75bf-9f6e-00f5edefc873" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019e64ba-ad90-75ec-9159-068f15b9270c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e64ba-ad90-7350-9a5f-95406b74c17f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_019e64ba-ad90-79b5-bdf4-1b62d4c169f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019e64ba-ad90-7350-9a5f-95406b74c17f" xlink:to="loc_us-gaap_PreferredStockValue_019e64ba-ad90-79b5-bdf4-1b62d4c169f9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019e64ba-ad90-79c4-8ec7-b3eb532933b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019e64ba-ad90-7350-9a5f-95406b74c17f" xlink:to="loc_us-gaap_CommonStockValue_019e64ba-ad90-79c4-8ec7-b3eb532933b6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019e64ba-ad90-74e2-ae7b-171dddc57840" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019e64ba-ad90-7350-9a5f-95406b74c17f" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019e64ba-ad90-74e2-ae7b-171dddc57840" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019e64ba-ad90-70cc-8e2e-4c509ab5fd41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019e64ba-ad90-7350-9a5f-95406b74c17f" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019e64ba-ad90-70cc-8e2e-4c509ab5fd41" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e64ba-ad90-7c9d-9f04-ca1ad03ad626" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e64ba-ad90-7cda-bc7d-eb7243b1428c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019e64ba-ad90-7c9d-9f04-ca1ad03ad626" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e64ba-ad90-7cda-bc7d-eb7243b1428c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019e64ba-ad90-76c1-9aa6-11b51faa6537" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssets"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019e64ba-ad90-7c9d-9f04-ca1ad03ad626" xlink:to="loc_us-gaap_OtherAssets_019e64ba-ad90-76c1-9aa6-11b51faa6537" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstate_019e64ba-ad90-771c-b679-16960c3ae80f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstate"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019e64ba-ad90-7c9d-9f04-ca1ad03ad626" xlink:to="loc_us-gaap_MortgageLoansOnRealEstate_019e64ba-ad90-771c-b679-16960c3ae80f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019e64ba-ad90-709a-8977-9bd2947a9a0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019e64ba-ad90-7c9d-9f04-ca1ad03ad626" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019e64ba-ad90-709a-8977-9bd2947a9a0f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_AvailableForSaleSecuritiesDebtSecuritiesFVO_019e64ba-ad90-7f62-8081-eca41091a204" xlink:href="mitt-20260630.xsd#mitt_AvailableForSaleSecuritiesDebtSecuritiesFVO"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019e64ba-ad90-7c9d-9f04-ca1ad03ad626" xlink:to="loc_mitt_AvailableForSaleSecuritiesDebtSecuritiesFVO_019e64ba-ad90-7f62-8081-eca41091a204" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_019e64ba-ad90-70a8-b69c-eb9a5e5f3ee6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCash"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019e64ba-ad90-7c9d-9f04-ca1ad03ad626" xlink:to="loc_us-gaap_RestrictedCash_019e64ba-ad90-70a8-b69c-eb9a5e5f3ee6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_019e64ba-ad90-7023-9ef1-e3fe9cfe1953" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019e64ba-ad90-7c9d-9f04-ca1ad03ad626" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_019e64ba-ad90-7023-9ef1-e3fe9cfe1953" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/ConsolidatedStatementsofOperationsUnaudited" xlink:type="simple" xlink:href="mitt-20260630.xsd#ConsolidatedStatementsofOperationsUnaudited"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/ConsolidatedStatementsofOperationsUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_019e64ba-ad90-7f12-8099-75e7576fe2aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_TransactionRelatedExpensesReversalOfExpense_019e64ba-ad90-74e9-b7e4-c1bf84654182" xlink:href="mitt-20260630.xsd#mitt_TransactionRelatedExpensesReversalOfExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019e64ba-ad90-7f12-8099-75e7576fe2aa" xlink:to="loc_mitt_TransactionRelatedExpensesReversalOfExpense_019e64ba-ad90-74e9-b7e4-c1bf84654182" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManagementFeeExpense_019e64ba-ad90-782e-b82b-fbafcc7c9cce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementFeeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019e64ba-ad90-7f12-8099-75e7576fe2aa" xlink:to="loc_us-gaap_ManagementFeeExpense_019e64ba-ad90-782e-b82b-fbafcc7c9cce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInvestmentExpense_019e64ba-ad90-7bf6-b55e-167350da920d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019e64ba-ad90-7f12-8099-75e7576fe2aa" xlink:to="loc_us-gaap_InvestmentIncomeInvestmentExpense_019e64ba-ad90-7bf6-b55e-167350da920d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_NonInvestmentRelatedExpenses_019e64ba-ad90-7487-bd38-003f9a8c9414" xlink:href="mitt-20260630.xsd#mitt_NonInvestmentRelatedExpenses"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NoninterestExpense_019e64ba-ad90-7f12-8099-75e7576fe2aa" xlink:to="loc_mitt_NonInvestmentRelatedExpenses_019e64ba-ad90-7487-bd38-003f9a8c9414" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e64ba-ad90-714b-9458-daf5f24cae6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e64ba-ad90-7452-9921-b05fdbbdc1f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_019e64ba-ad90-714b-9458-daf5f24cae6d" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e64ba-ad90-7452-9921-b05fdbbdc1f8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e64ba-ad90-7c92-907b-ab9f7d05aa91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_019e64ba-ad90-714b-9458-daf5f24cae6d" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e64ba-ad90-7c92-907b-ab9f7d05aa91" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019e64ba-ad90-787b-89d3-18ceb6601833" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019e64ba-ad90-754f-a930-00c0d4ea9188" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019e64ba-ad90-787b-89d3-18ceb6601833" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019e64ba-ad90-754f-a930-00c0d4ea9188" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e64ba-ad90-790b-ad9f-63711bf03484" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019e64ba-ad90-787b-89d3-18ceb6601833" xlink:to="loc_us-gaap_NetIncomeLoss_019e64ba-ad90-790b-ad9f-63711bf03484" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_019e64ba-ad90-797b-8c3a-4cbe7f10425c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_019e64ba-ad90-7b89-b9e2-0072df9868ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_019e64ba-ad90-797b-8c3a-4cbe7f10425c" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_019e64ba-ad90-7b89-b9e2-0072df9868ff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_019e64ba-ad90-77ee-9d1c-1884850eca73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_019e64ba-ad90-797b-8c3a-4cbe7f10425c" xlink:to="loc_us-gaap_NoninterestExpense_019e64ba-ad90-77ee-9d1c-1884850eca73" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019e64ba-ad90-73d9-88c0-2f595f57642a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_019e64ba-ad90-797b-8c3a-4cbe7f10425c" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_019e64ba-ad90-73d9-88c0-2f595f57642a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_019e64ba-ad90-7493-bb94-8bbb877cf4eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOperating_019e64ba-ad90-7e3e-a187-2dd666c95f72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeOperating"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_019e64ba-ad90-7493-bb94-8bbb877cf4eb" xlink:to="loc_us-gaap_InterestIncomeOperating_019e64ba-ad90-7e3e-a187-2dd666c95f72" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019e64ba-ad90-76c0-a5c4-0add7a6dec9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOperating"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestIncomeExpenseNet_019e64ba-ad90-7493-bb94-8bbb877cf4eb" xlink:to="loc_us-gaap_InterestExpenseOperating_019e64ba-ad90-76c0-a5c4-0add7a6dec9e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e64ba-ad90-7776-b1a5-a59354d59a70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_019e64ba-ad90-7681-8b0a-0d4c1395be00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e64ba-ad90-7776-b1a5-a59354d59a70" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_019e64ba-ad90-7681-8b0a-0d4c1395be00" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019e64ba-ad90-7ac1-b61d-19fed30b4d89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e64ba-ad90-7776-b1a5-a59354d59a70" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019e64ba-ad90-7ac1-b61d-19fed30b4d89" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019e64ba-ad90-74f6-8847-8fed9bb5298c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_RealizedGainLossOnPeriodicInterestSettlementsOfDerivativeInstrumentsNet_019e64ba-ad90-7c0f-a0d6-ba9456dabb70" xlink:href="mitt-20260630.xsd#mitt_RealizedGainLossOnPeriodicInterestSettlementsOfDerivativeInstrumentsNet"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_019e64ba-ad90-74f6-8847-8fed9bb5298c" xlink:to="loc_mitt_RealizedGainLossOnPeriodicInterestSettlementsOfDerivativeInstrumentsNet_019e64ba-ad90-7c0f-a0d6-ba9456dabb70" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_InvestmentUnrealizedGainLossFVO_019e64ba-ad90-7651-84ec-5922e4246cc5" xlink:href="mitt-20260630.xsd#mitt_InvestmentUnrealizedGainLossFVO"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_019e64ba-ad90-74f6-8847-8fed9bb5298c" xlink:to="loc_mitt_InvestmentUnrealizedGainLossFVO_019e64ba-ad90-7651-84ec-5922e4246cc5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_InvestmentAndDerivativeRealizedGainLossFVO_019e64ba-ad90-7654-a3e3-5a5fdaae9857" xlink:href="mitt-20260630.xsd#mitt_InvestmentAndDerivativeRealizedGainLossFVO"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_019e64ba-ad90-74f6-8847-8fed9bb5298c" xlink:to="loc_mitt_InvestmentAndDerivativeRealizedGainLossFVO_019e64ba-ad90-7654-a3e3-5a5fdaae9857" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/ConsolidatedStatementsofCashFlowsUnaudited" xlink:type="simple" xlink:href="mitt-20260630.xsd#ConsolidatedStatementsofCashFlowsUnaudited"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/ConsolidatedStatementsofCashFlowsUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_PaymentsForPurchaseofResidentialMortgageLoans_019e64ba-ad90-7594-9c43-b9d1faacd8c2" xlink:href="mitt-20260630.xsd#mitt_PaymentsForPurchaseofResidentialMortgageLoans"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_mitt_PaymentsForPurchaseofResidentialMortgageLoans_019e64ba-ad90-7594-9c43-b9d1faacd8c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_PurchaseOfAvailableForSaleSecuritiesDebtFVO_019e64ba-ad90-7dc2-93e4-76c8cd6d8d7b" xlink:href="mitt-20260630.xsd#mitt_PurchaseOfAvailableForSaleSecuritiesDebtFVO"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_mitt_PurchaseOfAvailableForSaleSecuritiesDebtFVO_019e64ba-ad90-7dc2-93e4-76c8cd6d8d7b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfLoansReceivable_019e64ba-ad90-7fb0-bb0c-9ecd2d412497" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfLoansReceivable"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_us-gaap_ProceedsFromSaleOfLoansReceivable_019e64ba-ad90-7fb0-bb0c-9ecd2d412497" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_ProceedsFromSaleOfAvailableForSaleSecuritiesDebtFVO_019e64ba-ad90-7a3e-9090-f15144cf82d6" xlink:href="mitt-20260630.xsd#mitt_ProceedsFromSaleOfAvailableForSaleSecuritiesDebtFVO"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_mitt_ProceedsFromSaleOfAvailableForSaleSecuritiesDebtFVO_019e64ba-ad90-7a3e-9090-f15144cf82d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_PrincipalRepaymentsOnResidentialMortgageLoans_019e64ba-ad90-7cf5-899a-ea261f01f1b2" xlink:href="mitt-20260630.xsd#mitt_PrincipalRepaymentsOnResidentialMortgageLoans"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_mitt_PrincipalRepaymentsOnResidentialMortgageLoans_019e64ba-ad90-7cf5-899a-ea261f01f1b2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfMortgageBackedSecuritiesMBS_019e64ba-ad90-75d3-a846-ea94490f18ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfMortgageBackedSecuritiesMBS"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfMortgageBackedSecuritiesMBS_019e64ba-ad90-75d3-a846-ea94490f18ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_PrincipalRepaymentsOnCommercialLoans_019e64ba-ad90-743e-b9a8-8c2c54d39a20" xlink:href="mitt-20260630.xsd#mitt_PrincipalRepaymentsOnCommercialLoans"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_mitt_PrincipalRepaymentsOnCommercialLoans_019e64ba-ad90-743e-b9a8-8c2c54d39a20" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_PrincipalFundingOnResidentialMortgageLoans_019e64ba-ad90-7214-a93f-e52d133f29bd" xlink:href="mitt-20260630.xsd#mitt_PrincipalFundingOnResidentialMortgageLoans"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_mitt_PrincipalFundingOnResidentialMortgageLoans_019e64ba-ad90-7214-a93f-e52d133f29bd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_019e64ba-ad90-72f2-8ff5-63c126efdcb6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_019e64ba-ad90-72f2-8ff5-63c126efdcb6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_NetSettlementOfInterestRateSwaps_019e64ba-ad90-7073-9d42-c9bf5fcabd06" xlink:href="mitt-20260630.xsd#mitt_NetSettlementOfInterestRateSwaps"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_mitt_NetSettlementOfInterestRateSwaps_019e64ba-ad90-7073-9d42-c9bf5fcabd06" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_NetSettlementOfSecuritiesToBeAnnounced_019e64ba-ad90-7c62-82d7-16d66cd0040b" xlink:href="mitt-20260630.xsd#mitt_NetSettlementOfSecuritiesToBeAnnounced"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_mitt_NetSettlementOfSecuritiesToBeAnnounced_019e64ba-ad90-7c62-82d7-16d66cd0040b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_ProceedsFromOtherInvestingActivity_019f92c6-3e0d-7313-9cd3-8c8cf03acfc7" xlink:href="mitt-20260630.xsd#mitt_ProceedsFromOtherInvestingActivity"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_mitt_ProceedsFromOtherInvestingActivity_019f92c6-3e0d-7313-9cd3-8c8cf03acfc7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_PaymentsForOtherInvestingActivity_019fc3ca-4dda-7156-ae5f-0d2edf3d7f80" xlink:href="mitt-20260630.xsd#mitt_PaymentsForOtherInvestingActivity"/>
    <link:calculationArc order="13" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-7891-96c3-bd54a4af596c" xlink:to="loc_mitt_PaymentsForOtherInvestingActivity_019fc3ca-4dda-7156-ae5f-0d2edf3d7f80" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e64ba-ad90-7478-b875-bb667c85b090" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_BorrowingsUnderRepurchaseAgreements_019e64ba-ad90-7305-b1ba-1eae42a50abf" xlink:href="mitt-20260630.xsd#mitt_BorrowingsUnderRepurchaseAgreements"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e64ba-ad90-7478-b875-bb667c85b090" xlink:to="loc_mitt_BorrowingsUnderRepurchaseAgreements_019e64ba-ad90-7305-b1ba-1eae42a50abf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_RepaymentsOnFixedRateLongTermFinancingArrangements_019e64ba-ad90-7205-accb-d2e060a0fac1" xlink:href="mitt-20260630.xsd#mitt_RepaymentsOnFixedRateLongTermFinancingArrangements"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e64ba-ad90-7478-b875-bb667c85b090" xlink:to="loc_mitt_RepaymentsOnFixedRateLongTermFinancingArrangements_019e64ba-ad90-7205-accb-d2e060a0fac1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_019e64ba-ad90-75ae-a9ef-ddaa6a39bff9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfFinancingCosts"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e64ba-ad90-7478-b875-bb667c85b090" xlink:to="loc_us-gaap_PaymentsOfFinancingCosts_019e64ba-ad90-75ae-a9ef-ddaa6a39bff9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromAccountsReceivableSecuritization_019e64ba-ad90-7361-a197-f846e5c437c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromAccountsReceivableSecuritization"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e64ba-ad90-7478-b875-bb667c85b090" xlink:to="loc_us-gaap_ProceedsFromAccountsReceivableSecuritization_019e64ba-ad90-7361-a197-f846e5c437c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfAccountsReceivableSecuritization_019e64ba-ad90-7348-9266-9a80db0c04c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfAccountsReceivableSecuritization"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e64ba-ad90-7478-b875-bb667c85b090" xlink:to="loc_us-gaap_RepaymentsOfAccountsReceivableSecuritization_019e64ba-ad90-7348-9266-9a80db0c04c6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019e64ba-ad90-7fae-ad43-55dbc6c10e30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e64ba-ad90-7478-b875-bb667c85b090" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019e64ba-ad90-7fae-ad43-55dbc6c10e30" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_019e64ba-ad90-7a2a-8ab6-9bd3d82bd9f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e64ba-ad90-7478-b875-bb667c85b090" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_019e64ba-ad90-7a2a-8ab6-9bd3d82bd9f5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_019e64ba-ad90-77ae-b91c-9b4089cabc63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e64ba-ad90-7478-b875-bb667c85b090" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_019e64ba-ad90-77ae-b91c-9b4089cabc63" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_019e64ba-ad90-7a84-81cd-4a186fd492ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e64ba-ad90-7172-9880-e8ab45fd463d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_019e64ba-ad90-7a84-81cd-4a186fd492ed" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e64ba-ad90-7172-9880-e8ab45fd463d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-78c1-9ff8-ca01ff5e9142" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_019e64ba-ad90-7a84-81cd-4a186fd492ed" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e64ba-ad90-78c1-9ff8-ca01ff5e9142" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e64ba-ad90-7bc8-8d6e-c482a4379d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_019e64ba-ad90-7a84-81cd-4a186fd492ed" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e64ba-ad90-7bc8-8d6e-c482a4379d7f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e64ba-ad90-7aef-a5c9-f44057875dac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019e64ba-ad90-7090-a26b-b0dbe2e9c469" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e64ba-ad90-7aef-a5c9-f44057875dac" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019e64ba-ad90-7090-a26b-b0dbe2e9c469" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e64ba-ad90-7d55-b78a-8fce8da6932e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e64ba-ad90-7aef-a5c9-f44057875dac" xlink:to="loc_us-gaap_NetIncomeLoss_019e64ba-ad90-7d55-b78a-8fce8da6932e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019e64ba-ad90-7479-b5fe-f3f605df3487" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e64ba-ad90-7aef-a5c9-f44057875dac" xlink:to="loc_us-gaap_ShareBasedCompensation_019e64ba-ad90-7479-b5fe-f3f605df3487" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_InvestmentAndDerivativeRealizedGainLossFVO_019e64ba-ad90-7972-a9cd-41a1031e869f" xlink:href="mitt-20260630.xsd#mitt_InvestmentAndDerivativeRealizedGainLossFVO"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e64ba-ad90-7aef-a5c9-f44057875dac" xlink:to="loc_mitt_InvestmentAndDerivativeRealizedGainLossFVO_019e64ba-ad90-7972-a9cd-41a1031e869f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_019e64ba-ad90-77d2-9516-d7a691ba91bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherCurrentAssets"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e64ba-ad90-7aef-a5c9-f44057875dac" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_019e64ba-ad90-77d2-9516-d7a691ba91bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_InvestmentUnrealizedGainLossFVO_019e64ba-ad90-743e-b9a5-7c80d7cf3e57" xlink:href="mitt-20260630.xsd#mitt_InvestmentUnrealizedGainLossFVO"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e64ba-ad90-7aef-a5c9-f44057875dac" xlink:to="loc_mitt_InvestmentUnrealizedGainLossFVO_019e64ba-ad90-743e-b9a5-7c80d7cf3e57" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentForAmortization_019e64ba-ad90-79a6-8476-dd23bb43c1ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentForAmortization"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e64ba-ad90-7aef-a5c9-f44057875dac" xlink:to="loc_us-gaap_AdjustmentForAmortization_019e64ba-ad90-79a6-8476-dd23bb43c1ae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_EarningsLossFromInvestmentInDebtAndEquityOfAffiliates_019e64ba-ad90-7e45-94e2-020eb29cecee" xlink:href="mitt-20260630.xsd#mitt_EarningsLossFromInvestmentInDebtAndEquityOfAffiliates"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e64ba-ad90-7aef-a5c9-f44057875dac" xlink:to="loc_mitt_EarningsLossFromInvestmentInDebtAndEquityOfAffiliates_019e64ba-ad90-7e45-94e2-020eb29cecee" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/ConsolidatedStatementsofCashFlowsUnauditedParenthetical" xlink:type="simple" xlink:href="mitt-20260630.xsd#ConsolidatedStatementsofCashFlowsUnauditedParenthetical"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/ConsolidatedStatementsofCashFlowsUnauditedParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e64ba-ad90-7bc8-819f-5b86568cfaab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e64ba-ad90-77ab-bc6c-4a933083fe63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e64ba-ad90-7bc8-819f-5b86568cfaab" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e64ba-ad90-77ab-bc6c-4a933083fe63" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019e64ba-ad90-70aa-ae6c-01d6e9cc9775" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e64ba-ad90-7bc8-819f-5b86568cfaab" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019e64ba-ad90-70aa-ae6c-01d6e9cc9775" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/LoansScheduleofCompanysResidentialMortgageLoanPortfolioandCommercialLoanPortfolioDetails" xlink:type="simple" xlink:href="mitt-20260630.xsd#LoansScheduleofCompanysResidentialMortgageLoanPortfolioandCommercialLoanPortfolioDetails"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/LoansScheduleofCompanysResidentialMortgageLoanPortfolioandCommercialLoanPortfolioDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_019e64ba-ad90-7253-82b6-248daaba5bae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesReceivableGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_LoansReceivableGrossUnrealizedGains_019e64ba-ad90-7266-a281-cf6d47ce4d34" xlink:href="mitt-20260630.xsd#mitt_LoansReceivableGrossUnrealizedGains"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_019e64ba-ad90-7253-82b6-248daaba5bae" xlink:to="loc_mitt_LoansReceivableGrossUnrealizedGains_019e64ba-ad90-7266-a281-cf6d47ce4d34" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_LoansReceivableGrossUnrealizedLosses_019e64ba-ad90-7cd2-b967-744db6144244" xlink:href="mitt-20260630.xsd#mitt_LoansReceivableGrossUnrealizedLosses"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_019e64ba-ad90-7253-82b6-248daaba5bae" xlink:to="loc_mitt_LoansReceivableGrossUnrealizedLosses_019e64ba-ad90-7cd2-b967-744db6144244" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_019e64ba-ad90-7da9-8f53-60927e43b0d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NotesReceivableGross_019e64ba-ad90-7253-82b6-248daaba5bae" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_019e64ba-ad90-7da9-8f53-60927e43b0d3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/RealEstateSecuritiesScheduleofRealEstateSecuritiesPortfolioDetails" xlink:type="simple" xlink:href="mitt-20260630.xsd#RealEstateSecuritiesScheduleofRealEstateSecuritiesPortfolioDetails"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/RealEstateSecuritiesScheduleofRealEstateSecuritiesPortfolioDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_mitt_AvailableForSaleDebtSecuritiesAmortizedCostBasisFVO_019e64ba-ae58-78a4-9055-79d11a55bd26" xlink:href="mitt-20260630.xsd#mitt_AvailableForSaleDebtSecuritiesAmortizedCostBasisFVO"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxFVO_019e64ba-ae58-7d36-9e90-8911bee6fbc0" xlink:href="mitt-20260630.xsd#mitt_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxFVO"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_AvailableForSaleDebtSecuritiesAmortizedCostBasisFVO_019e64ba-ae58-78a4-9055-79d11a55bd26" xlink:to="loc_mitt_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxFVO_019e64ba-ae58-7d36-9e90-8911bee6fbc0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTaxFVO_019e64ba-ae58-707e-926b-1744fcd2f2d0" xlink:href="mitt-20260630.xsd#mitt_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTaxFVO"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_AvailableForSaleDebtSecuritiesAmortizedCostBasisFVO_019e64ba-ae58-78a4-9055-79d11a55bd26" xlink:to="loc_mitt_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTaxFVO_019e64ba-ae58-707e-926b-1744fcd2f2d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_AvailableForSaleSecuritiesDebtSecuritiesFVO_019e64ba-ae58-74bb-b3f7-24609b9f24f7" xlink:href="mitt-20260630.xsd#mitt_AvailableForSaleSecuritiesDebtSecuritiesFVO"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_AvailableForSaleDebtSecuritiesAmortizedCostBasisFVO_019e64ba-ae58-78a4-9055-79d11a55bd26" xlink:to="loc_mitt_AvailableForSaleSecuritiesDebtSecuritiesFVO_019e64ba-ae58-74bb-b3f7-24609b9f24f7" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/RealEstateSecuritiesScheduleofWeightedAverageLifeofRealEstateSecuritiesDetails" xlink:type="simple" xlink:href="mitt-20260630.xsd#RealEstateSecuritiesScheduleofWeightedAverageLifeofRealEstateSecuritiesDetails"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/RealEstateSecuritiesScheduleofWeightedAverageLifeofRealEstateSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAmortizedCostFVO_019e64ba-ae58-7ea3-bf93-eebc261346a6" xlink:href="mitt-20260630.xsd#mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAmortizedCostFVO"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterOneThroughFiveYearsAmortizedCostFVO_019e64ba-ae58-7fc1-a344-656275203538" xlink:href="mitt-20260630.xsd#mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterOneThroughFiveYearsAmortizedCostFVO"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAmortizedCostFVO_019e64ba-ae58-7ea3-bf93-eebc261346a6" xlink:to="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterOneThroughFiveYearsAmortizedCostFVO_019e64ba-ae58-7fc1-a344-656275203538" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterFiveThroughTenYearsAmortizedCostFVO_019e64ba-ae58-7267-9cf5-6a9cdc6cc288" xlink:href="mitt-20260630.xsd#mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterFiveThroughTenYearsAmortizedCostFVO"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAmortizedCostFVO_019e64ba-ae58-7ea3-bf93-eebc261346a6" xlink:to="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterFiveThroughTenYearsAmortizedCostFVO_019e64ba-ae58-7267-9cf5-6a9cdc6cc288" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_DebtSecuritiesAvailableForSaleAllocatedAndSingleMaturityDateMaturityAfter10YearsAmortizedCostFVO_019e64ba-ae58-78bb-a0e3-d94214035e22" xlink:href="mitt-20260630.xsd#mitt_DebtSecuritiesAvailableForSaleAllocatedAndSingleMaturityDateMaturityAfter10YearsAmortizedCostFVO"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAmortizedCostFVO_019e64ba-ae58-7ea3-bf93-eebc261346a6" xlink:to="loc_mitt_DebtSecuritiesAvailableForSaleAllocatedAndSingleMaturityDateMaturityAfter10YearsAmortizedCostFVO_019e64ba-ae58-78bb-a0e3-d94214035e22" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateWithinOneYearAmortizedCostFVO_019e64ba-ae58-78a4-b290-697444eb9003" xlink:href="mitt-20260630.xsd#mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateWithinOneYearAmortizedCostFVO"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAmortizedCostFVO_019e64ba-ae58-7ea3-bf93-eebc261346a6" xlink:to="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateWithinOneYearAmortizedCostFVO_019e64ba-ae58-78a4-b290-697444eb9003" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateFairValueFVO_019e64ba-ae58-7186-b6cf-ecb83d5c391f" xlink:href="mitt-20260630.xsd#mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateFairValueFVO"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterOneThroughFiveYearsFairValueFVO_019e64ba-ae58-7332-8081-ff0cc8331cf1" xlink:href="mitt-20260630.xsd#mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterOneThroughFiveYearsFairValueFVO"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateFairValueFVO_019e64ba-ae58-7186-b6cf-ecb83d5c391f" xlink:to="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterOneThroughFiveYearsFairValueFVO_019e64ba-ae58-7332-8081-ff0cc8331cf1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterFiveThroughTenYearsFairValueFVO_019e64ba-ae58-7815-83bf-0bc7c307bd54" xlink:href="mitt-20260630.xsd#mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterFiveThroughTenYearsFairValueFVO"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateFairValueFVO_019e64ba-ae58-7186-b6cf-ecb83d5c391f" xlink:to="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfterFiveThroughTenYearsFairValueFVO_019e64ba-ae58-7815-83bf-0bc7c307bd54" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfter10YearsFairValueFVO_019e64ba-ae58-78e2-b07f-0a6e88876346" xlink:href="mitt-20260630.xsd#mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfter10YearsFairValueFVO"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateFairValueFVO_019e64ba-ae58-7186-b6cf-ecb83d5c391f" xlink:to="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateAfter10YearsFairValueFVO_019e64ba-ae58-78e2-b07f-0a6e88876346" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateWithinOneYearFairValueFVO_019e64ba-ae58-7277-a26b-f8af198440e3" xlink:href="mitt-20260630.xsd#mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateWithinOneYearFairValueFVO"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateFairValueFVO_019e64ba-ae58-7186-b6cf-ecb83d5c391f" xlink:to="loc_mitt_DebtSecuritiesAvailableForSaleMaturityAllocatedAndSingleMaturityDateWithinOneYearFairValueFVO_019e64ba-ae58-7277-a26b-f8af198440e3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/FairvaluemeasurementsScheduleofFinancialInstrumentsMeasuredatFairValueDetails" xlink:type="simple" xlink:href="mitt-20260630.xsd#FairvaluemeasurementsScheduleofFinancialInstrumentsMeasuredatFairValueDetails"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/FairvaluemeasurementsScheduleofFinancialInstrumentsMeasuredatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019e64ba-ae58-7420-9941-8f88c8d4c8a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_019e64ba-ae58-750b-9d04-9320ef235cce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_019e64ba-ae58-7420-9941-8f88c8d4c8a9" xlink:to="loc_us-gaap_DebtInstrumentFairValue_019e64ba-ae58-750b-9d04-9320ef235cce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019e64ba-ae58-7eb3-bbee-25dda3ff8411" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_019e64ba-ae58-7420-9941-8f88c8d4c8a9" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019e64ba-ae58-7eb3-bbee-25dda3ff8411" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019e64ba-ae58-78d0-93d6-47eb5901a30e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019e64ba-ae58-70a5-8c54-aa64889ab8bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_019e64ba-ae58-78d0-93d6-47eb5901a30e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019e64ba-ae58-70a5-8c54-aa64889ab8bf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_019e64ba-ae58-7542-80e2-3111ce5e31ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_019e64ba-ae58-78d0-93d6-47eb5901a30e" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_019e64ba-ae58-7542-80e2-3111ce5e31ec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsFairValueDisclosure_019e64ba-ae58-7c01-b6f3-cc63246e3a78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsFairValueDisclosure"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_019e64ba-ae58-78d0-93d6-47eb5901a30e" xlink:to="loc_us-gaap_OtherAssetsFairValueDisclosure_019e64ba-ae58-7c01-b6f3-cc63246e3a78" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019e64ba-ae58-7ad9-ae58-e88527f2369a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_019e64ba-ae58-78d0-93d6-47eb5901a30e" xlink:to="loc_us-gaap_DerivativeAssets_019e64ba-ae58-7ad9-ae58-e88527f2369a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019e64ba-ae58-73db-a76d-0ad556d49554" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_019e64ba-ae58-78d0-93d6-47eb5901a30e" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019e64ba-ae58-73db-a76d-0ad556d49554" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstate_019e64ba-ae58-78df-8c8f-f604f3cc00a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstate"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_019e64ba-ae58-78d0-93d6-47eb5901a30e" xlink:to="loc_us-gaap_MortgageLoansOnRealEstate_019e64ba-ae58-78df-8c8f-f604f3cc00a0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/FinancingScheduleofInterestExpenseIncurredConvertibleNotesandSeniorUnsecuredNotesDetails" xlink:type="simple" xlink:href="mitt-20260630.xsd#FinancingScheduleofInterestExpenseIncurredConvertibleNotesandSeniorUnsecuredNotesDetails"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/FinancingScheduleofInterestExpenseIncurredConvertibleNotesandSeniorUnsecuredNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_019e64ba-ae58-7bcb-adac-d4dec0fded2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDebt"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_019e64ba-ae58-7a48-a54e-b258671cea1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDebtExcludingAmortization"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpenseDebt_019e64ba-ae58-7bcb-adac-d4dec0fded2c" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_019e64ba-ae58-7a48-a54e-b258671cea1c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_019e64ba-ae58-7a3d-94ca-d248557432ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InterestExpenseDebt_019e64ba-ae58-7bcb-adac-d4dec0fded2c" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_019e64ba-ae58-7a3d-94ca-d248557432ce" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/OtherassetsandliabilitiesScheduleofOtherAssetsandOtherLiabilitiesDetails" xlink:type="simple" xlink:href="mitt-20260630.xsd#OtherassetsandliabilitiesScheduleofOtherAssetsandOtherLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/OtherassetsandliabilitiesScheduleofOtherAssetsandOtherLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019e64ba-ae59-71cc-ab76-a43212535f5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueToCorrespondentBrokers_019e64ba-ae59-7dc4-bac1-880b27cf7c77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DueToCorrespondentBrokers"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilities_019e64ba-ae59-71cc-ab76-a43212535f5a" xlink:to="loc_us-gaap_DueToCorrespondentBrokers_019e64ba-ae59-7dc4-bac1-880b27cf7c77" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrentAndNoncurrent_019e64ba-ae59-7820-b729-7b2f9bcff5d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPayableCurrentAndNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilities_019e64ba-ae59-71cc-ab76-a43212535f5a" xlink:to="loc_us-gaap_InterestPayableCurrentAndNoncurrent_019e64ba-ae59-7820-b729-7b2f9bcff5d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_019e64ba-ae59-79e7-9055-4a9d88e14fdc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilities_019e64ba-ae59-71cc-ab76-a43212535f5a" xlink:to="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_019e64ba-ae59-79e7-9055-4a9d88e14fdc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_019e64ba-ae59-7b1c-a28f-db7907c1ae62" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesAndOtherLiabilities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilities_019e64ba-ae59-71cc-ab76-a43212535f5a" xlink:to="loc_us-gaap_AccruedLiabilitiesAndOtherLiabilities_019e64ba-ae59-7b1c-a28f-db7907c1ae62" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxesPayableCurrentAndNoncurrent_019e64ba-ae59-736f-a3d4-9fffb1b6e605" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TaxesPayableCurrentAndNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilities_019e64ba-ae59-71cc-ab76-a43212535f5a" xlink:to="loc_us-gaap_TaxesPayableCurrentAndNoncurrent_019e64ba-ae59-736f-a3d4-9fffb1b6e605" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019e64ba-ae59-7c1c-8153-dba3729c77a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_DerivativeAssetNetOfVariationMargin_019e64ba-ae59-7263-8bbd-c810c381abdf" xlink:href="mitt-20260630.xsd#mitt_DerivativeAssetNetOfVariationMargin"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssets_019e64ba-ae59-7c1c-8153-dba3729c77a9" xlink:to="loc_mitt_DerivativeAssetNetOfVariationMargin_019e64ba-ae59-7263-8bbd-c810c381abdf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestReceivable_019e64ba-ae59-752f-ad08-7c2a975bd90a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestReceivable"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssets_019e64ba-ae59-7c1c-8153-dba3729c77a9" xlink:to="loc_us-gaap_InterestReceivable_019e64ba-ae59-752f-ad08-7c2a975bd90a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneous_019e64ba-ae59-7f04-aeca-dabc08eb249e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsMiscellaneous"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssets_019e64ba-ae59-7c1c-8153-dba3729c77a9" xlink:to="loc_us-gaap_OtherAssetsMiscellaneous_019e64ba-ae59-7f04-aeca-dabc08eb249e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueFromCorrespondentBrokers_019e64ba-ae59-7ed5-9e3e-506c4052be6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DueFromCorrespondentBrokers"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssets_019e64ba-ae59-7c1c-8153-dba3729c77a9" xlink:to="loc_us-gaap_DueFromCorrespondentBrokers_019e64ba-ae59-7ed5-9e3e-506c4052be6d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAcquiredThroughForeclosure_019e64ba-ae59-72e6-adae-437c2e5c9438" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateAcquiredThroughForeclosure"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssets_019e64ba-ae59-7c1c-8153-dba3729c77a9" xlink:to="loc_us-gaap_RealEstateAcquiredThroughForeclosure_019e64ba-ae59-72e6-adae-437c2e5c9438" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/OtherassetsandliabilitiesScheduleofGainsLossesRelatedtoDerivativesandOtherInstrumentsDetails" xlink:type="simple" xlink:href="mitt-20260630.xsd#OtherassetsandliabilitiesScheduleofGainsLossesRelatedtoDerivativesandOtherInstrumentsDetails"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/OtherassetsandliabilitiesScheduleofGainsLossesRelatedtoDerivativesandOtherInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentCompanyRealizedAndUnrealizedGainLossOnInvestmentAndForeignCurrency_019e64ba-ae59-75e8-99a2-ffff12d3dabe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyRealizedAndUnrealizedGainLossOnInvestmentAndForeignCurrency"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_019e64ba-ae59-7d29-9d17-31a4a5ca4b59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealizedInvestmentGainsLosses"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InvestmentCompanyRealizedAndUnrealizedGainLossOnInvestmentAndForeignCurrency_019e64ba-ae59-75e8-99a2-ffff12d3dabe" xlink:to="loc_us-gaap_RealizedInvestmentGainsLosses_019e64ba-ae59-7d29-9d17-31a4a5ca4b59" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInvestments_019e64ba-ae59-74a2-b0f8-c0d83af2d611" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrealizedGainLossOnInvestments"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InvestmentCompanyRealizedAndUnrealizedGainLossOnInvestmentAndForeignCurrency_019e64ba-ae59-75e8-99a2-ffff12d3dabe" xlink:to="loc_us-gaap_UnrealizedGainLossOnInvestments_019e64ba-ae59-74a2-b0f8-c0d83af2d611" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_RealizedGainLossOnPeriodicInterestSettlementsOfDerivativeInstrumentsNet_019e64ba-ae59-7de8-9e9e-cd9155a3d9a1" xlink:href="mitt-20260630.xsd#mitt_RealizedGainLossOnPeriodicInterestSettlementsOfDerivativeInstrumentsNet"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_InvestmentCompanyRealizedAndUnrealizedGainLossOnInvestmentAndForeignCurrency_019e64ba-ae59-75e8-99a2-ffff12d3dabe" xlink:to="loc_mitt_RealizedGainLossOnPeriodicInterestSettlementsOfDerivativeInstrumentsNet_019e64ba-ae59-7de8-9e9e-cd9155a3d9a1" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/EarningspershareScheduleofBasicandDilutedEarningsPerShareDetails" xlink:type="simple" xlink:href="mitt-20260630.xsd#EarningspershareScheduleofBasicandDilutedEarningsPerShareDetails"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/EarningspershareScheduleofBasicandDilutedEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic_019e64ba-ae59-7421-bdc3-40c7572703a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e64ba-ae59-7036-a0b4-88e353813063" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic_019e64ba-ae59-7421-bdc3-40c7572703a4" xlink:to="loc_us-gaap_NetIncomeLoss_019e64ba-ae59-7036-a0b4-88e353813063" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019e64ba-ae59-7d6a-8fc0-8aa40c6ce0c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic_019e64ba-ae59-7421-bdc3-40c7572703a4" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019e64ba-ae59-7d6a-8fc0-8aa40c6ce0c2" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/IncometaxesScheduleofComponentsofIncomeTaxExpenseBenefitDetails" xlink:type="simple" xlink:href="mitt-20260630.xsd#IncometaxesScheduleofComponentsofIncomeTaxExpenseBenefitDetails"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/IncometaxesScheduleofComponentsofIncomeTaxExpenseBenefitDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e64ba-af23-78c2-b62c-b04e7695e3f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations_019e64ba-af23-75a2-8e35-f24cca868285" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_019e64ba-af23-78c2-b62c-b04e7695e3f8" xlink:to="loc_us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations_019e64ba-af23-75a2-8e35-f24cca868285" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations_019e64ba-af23-7c3d-a2f6-e1c4f95420ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_019e64ba-af23-78c2-b62c-b04e7695e3f8" xlink:to="loc_us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations_019e64ba-af23-7c3d-a2f6-e1c4f95420ef" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.agmit.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="mitt-20260630.xsd#CommitmentsandContingenciesDetails"/>
  <link:calculationLink xlink:role="http://www.agmit.com/role/CommitmentsandContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_mitt_LongtermPurchaseRemainingCommitmentAmount_019e64ba-af23-78e9-879d-d33ef3f8ffbf" xlink:href="mitt-20260630.xsd#mitt_LongtermPurchaseRemainingCommitmentAmount"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentAmount_019e64ba-af23-7754-8cea-367df3003312" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermPurchaseCommitmentAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_LongtermPurchaseRemainingCommitmentAmount_019e64ba-af23-78e9-879d-d33ef3f8ffbf" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentAmount_019e64ba-af23-7754-8cea-367df3003312" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mitt_LongTermPurchaseCommitmentFundedAmount_019e64ba-af23-7fcd-b417-921abf480382" xlink:href="mitt-20260630.xsd#mitt_LongTermPurchaseCommitmentFundedAmount"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_mitt_LongtermPurchaseRemainingCommitmentAmount_019e64ba-af23-78e9-879d-d33ef3f8ffbf" xlink:to="loc_mitt_LongTermPurchaseCommitmentFundedAmount_019e64ba-af23-7fcd-b417-921abf480382" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
