Sandbox::https://github.com/microsoft/agent-framework/pull/8801

Marco Minerva (marcominerva) · 2026-09-28T15:36:27Z

Bring session deletion operation to the shared AgentSessionStore abstract contract, so specialized stores also share a complete set of lifecycle methods. It was not initially considered when the abstractions moved to Agents.AI.Abstractions (#7991).

API and Abstraction Changes:

Added the abstract method DeleteSessionAsync to the AgentSessionStore base class, requiring all implementations to provide a way to delete sessions. The method is documented to treat missing sessions as a no-op. [1] [2]
Updated the public API files for all supported .NET targets to include the new DeleteSessionAsync method.

Implementation Updates:

Implemented DeleteSessionAsync in all major agent session store classes, including FileSystemAgentSessionStore, FoundryAgentSessionStore, InMemoryAgentSessionStore (both Foundry and Local), AzureBlobAgentSessionStore, IsolationKeyScopedAgentSessionStore, and NoopAgentSessionStore. Each implementation ensures deletion is idempotent and handles resource-specific details. [1] [2] [3] [4] [5] [6] [7]

Documentation Updates:

Updated the architectural decision record and specification documents to describe the new deletion capability, its contract, and its impact on implementers and consumers. [1] [2] [3] [4]
Clarified documentation for DelegatingAgentSessionStore to note that delete operations are now forwarded to the inner store by default.

Fixes #8586

Bring session deletion back to the shared AgentSessionStore contract, so the store handles a session's whole lifecycle again. It was removed when the abstraction moved to Agents.AI.Abstractions (microsoft#7991). [PREVIEW BREAKING] DeleteSessionAsync is abstract: custom stores must implement it. - In-box stores implement it; deleting a missing session is a no-op - Decorators forward it, adding the isolation partition when needed - Update PublicAPI.Unshipped.txt, unit tests, ADR-0039 and spec 003 Fixes microsoft#8586

Copilot

Copilot review overview

🟡 Changes recommended

Filesystem deletion can silently succeed without deleting an inaccessible stored session, and Foundry in-memory deletion lacks direct coverage.

Review effort: Balanced
Findings: 1 · 1

Open (2)

What changed in this PR

Restores session deletion to the shared .NET AgentSessionStore lifecycle contract and implements it across built-in stores.

Changes:

Adds DeleteSessionAsync to the abstraction and API baselines.
Implements idempotent deletion across storage backends and decorators.
Updates tests, specifications, and ADR documentation.

File	Description
`dotnet/tests/Microsoft.Agents.AI.UnitTests/DelegatingAgentSessionStoreTests.cs`	Tests delete delegation.
`dotnet/tests/Microsoft.Agents.AI.Hosting.UnitTests/IsolationKeyScopedAgentSessionStoreTests.cs`	Tests isolation-scoped deletion.
`dotnet/tests/Microsoft.Agents.AI.Hosting.UnitTests/InMemoryAgentSessionStoreTests.cs`	Tests local and no-op deletion.
`dotnet/tests/Microsoft.Agents.AI.Hosting.OpenAI.UnitTests/ResponseSessionRegressionTests.cs`	Updates test store implementation.
`dotnet/tests/Microsoft.Agents.AI.Hosting.AzureStorage.UnitTests/AzureBlobAgentSessionStoreTests.cs`	Tests blob deletion.
`dotnet/tests/Microsoft.Agents.AI.Foundry.Hosting.UnitTests/ResilientTwoLifetimeIntegrationTests.cs`	Forwards deletion in test store.
`dotnet/tests/Microsoft.Agents.AI.Foundry.Hosting.UnitTests/FoundryAgentSessionStoreTests.cs`	Tests Foundry deletion.
`dotnet/tests/Microsoft.Agents.AI.Foundry.Hosting.UnitTests/FileSystemAgentSessionStoreTests.cs`	Tests filesystem deletion.
`dotnet/tests/Microsoft.Agents.AI.Foundry.Hosting.UnitTests/AgentFrameworkResponseHandlerResilienceTests.cs`	Updates test implementations.
`dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AgentSessionStoreTests.cs`	Updates abstraction test store.
`dotnet/src/Microsoft.Agents.AI/PublicAPI/netstandard2.0/PublicAPI.Unshipped.txt`	Records delegating API.
`dotnet/src/Microsoft.Agents.AI/PublicAPI/net9.0/PublicAPI.Unshipped.txt`	Records delegating API.
`dotnet/src/Microsoft.Agents.AI/PublicAPI/net8.0/PublicAPI.Unshipped.txt`	Records delegating API.
`dotnet/src/Microsoft.Agents.AI/PublicAPI/net472/PublicAPI.Unshipped.txt`	Records delegating API.
`dotnet/src/Microsoft.Agents.AI/PublicAPI/net10.0/PublicAPI.Unshipped.txt`	Records delegating API.
`dotnet/src/Microsoft.Agents.AI/DelegatingAgentSessionStore.cs`	Forwards delete operations.
`dotnet/src/Microsoft.Agents.AI.Hosting/NoopAgentSessionStore.cs`	Adds no-op deletion.
`dotnet/src/Microsoft.Agents.AI.Hosting/Local/InMemoryAgentSessionStore.cs`	Adds local-memory deletion.
`dotnet/src/Microsoft.Agents.AI.Hosting/IsolationKeyScopedAgentSessionStore.cs`	Applies isolation to deletion.
`dotnet/src/Microsoft.Agents.AI.Hosting.AzureStorage/Blob/AzureBlobAgentSessionStore.cs`	Deletes session blobs.
`dotnet/src/Microsoft.Agents.AI.Foundry.Hosting/InMemoryAgentSessionStore.cs`	Adds Foundry-memory deletion.
`dotnet/src/Microsoft.Agents.AI.Foundry.Hosting/FoundryAgentSessionStore.cs`	Deletes Foundry state items.
`dotnet/src/Microsoft.Agents.AI.Foundry.Hosting/FileSystemAgentSessionStore.cs`	Deletes session files.
`dotnet/src/Microsoft.Agents.AI.Abstractions/PublicAPI/netstandard2.0/PublicAPI.Unshipped.txt`	Records shared API.
`dotnet/src/Microsoft.Agents.AI.Abstractions/PublicAPI/net9.0/PublicAPI.Unshipped.txt`	Records shared API.
`dotnet/src/Microsoft.Agents.AI.Abstractions/PublicAPI/net8.0/PublicAPI.Unshipped.txt`	Records shared API.
`dotnet/src/Microsoft.Agents.AI.Abstractions/PublicAPI/net472/PublicAPI.Unshipped.txt`	Records shared API.
`dotnet/src/Microsoft.Agents.AI.Abstractions/PublicAPI/net10.0/PublicAPI.Unshipped.txt`	Records shared API.
`dotnet/src/Microsoft.Agents.AI.Abstractions/AgentSessionStore.cs`	Defines deletion contract.
`docs/specs/003-dotnet-hosting-protocol-helpers.md`	Documents deletion behavior.
`docs/decisions/0039-shared-agent-session-store.md`	Updates lifecycle decision.

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- FileSystemAgentSessionStore: delete without a File.Exists precheck so access and I/O failures surface; a missing agent directory stays a no-op. - Add unit tests for the Foundry InMemoryAgentSessionStore delete path.

Normalized the file header in `RecordingLoggerFactory.cs` by removing an extra leading character/encoding artifact from the copyright line. No functional code was changed.

…n-store-delete

…n store

Marco Minerva (marcominerva) · 2026-10-05T07:40:25Z

Roger Barreto (@rogerbarreto), I have addressed the issues reported by the deployment actions.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot AI balanced review requested due to automatic review settings September 28, 2026 15:36

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agent-framework-automation Bot added documentation Usage: [Issues, PRs], Target: documentation in the code base and learn docs .NET Usage: [Issues, PRs], Target: .Net labels Sep 28, 2026

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Marco Minerva (marcominerva) mentioned this pull request Sep 28, 2026

.NET: Why has DeleteSessionAsync been removed from AgentSessionStore? #8586

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Comment thread dotnet/src/Microsoft.Agents.AI.Foundry.Hosting/FileSystemAgentSessionStore.cs Resolved

Comment thread dotnet/src/Microsoft.Agents.AI.Foundry.Hosting/InMemoryAgentSessionStore.cs Resolved

.NET: Address session store delete review

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- FileSystemAgentSessionStore: delete without a File.Exists precheck so access and I/O failures surface; a missing agent directory stays a no-op. - Add unit tests for the Foundry InMemoryAgentSessionStore delete path.

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westey (westey-m) assigned Roger Barreto (rogerbarreto) Sep 28, 2026

Merge branch 'main' into dotnet-readd-session-store-delete

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Comment thread dotnet/src/Microsoft.Agents.AI.Foundry.Hosting/FileSystemAgentSessionStore.cs Resolved

Roger Barreto (rogerbarreto) reviewed Sep 29, 2026

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Comment thread dotnet/src/Microsoft.Agents.AI.Foundry.Hosting/FoundryAgentSessionStore.cs Resolved

Roger Barreto (rogerbarreto) reviewed Sep 29, 2026

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Comment thread dotnet/src/Microsoft.Agents.AI.Hosting.AzureStorage/Blob/AzureBlobAgentSessionStore.cs Resolved

Normalize RecordingLoggerFactory header

f01862c

Normalized the file header in `RecordingLoggerFactory.cs` by removing an extra leading character/encoding artifact from the copyright line. No functional code was changed.

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Marco Minerva (marcominerva) added 2 commits October 2, 2026 15:40

Merge remote-tracking branch 'upstream/main' into dotnet-readd-sessio…

bbe5f65

…n-store-delete

Implement DeleteSessionAsync in OAuthConsentPolicyHandlerTests sessio…

4be7317

…n store

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Marco Minerva (marcominerva) mentioned this pull request Oct 20, 2026

.NET: Honor hosted agent lifetimes and add request-time agent selection for AG-UI hosting #9382

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Comment thread ....AI.Hosting.AzureStorage.UnitTests/Microsoft.Agents.AI.Hosting.AzureStorage.UnitTests.csproj Resolved

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Merge branch 'main' into dotnet-readd-session-store-delete

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westey (westey-m) temporarily deployed to github-app-auth October 21, 2026 10:26 — with GitHub Actions Inactive

Move CapturingLoggerFactory to shared unit test code

eae367a

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SergeyMenshykh approved these changes Oct 21, 2026

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Merge branch 'main' into dotnet-readd-session-store-delete

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Merged via the queue into microsoft:main with commit 10f7f98 Oct 22, 2026
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.NET: Add AgentSessionStore.DeleteSessionAsync to the Abstraction - #8801

.NET: Add AgentSessionStore.DeleteSessionAsync to the Abstraction#8801
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Marco Minerva (marcominerva) commented Sep 28, 2026 •

edited by rogerbarreto

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Marco Minerva (marcominerva) commented Sep 28, 2026 •

edited by rogerbarreto

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