.NET: [Bug]: FileSystemJsonCheckPointStore for Agent Workflow , RetrieveIndexAsync() returns all checkpoint entries instead of filtering by SessionId

[Sachin-Nand]

Description

RetrieveIndexAsync(sessionId) appears to return all checkpoint entries from index.jsonl instead of filtering entries based on the provided sessionId.

only the checkpoint entries belonging to the filtered session should be returned but the method returns all entries from the index file.

Code Sample

var store_checkpoint = new FileSystemJsonCheckpointStore(dirinfo);
string sessionId= "some_sessionId"
List<CheckpointInfo> checkpoints = [.. await store_checkpoint.RetrieveIndexAsync(sessionId!)];

Error Messages / Stack Traces

Package Versions

Microsoft.Agents.AI.Workflows 1.0.0-rc1

.NET Version

No response

Additional Context

No response

[github-actions]

🤖 Automated triage reproduction notes (agent-authored — trust but verify)

Agent analysis

Repro: FileSystemJsonCheckpointStore.RetrieveIndexAsync() in dotnet/src/Microsoft.Agents.AI.Workflows/Checkpointing/FileSystemJsonCheckpointStore.cs (line 187) returns this.CheckpointIndex unfiltered, ignoring the sessionId parameter entirely. Minimal repro: create checkpoints for two different sessionIds via CreateCheckpointAsync, then call RetrieveIndexAsync with one sessionId — all checkpoints are returned instead of only those matching the requested session. The fix should filter the HashSet by comparing each entry's CheckpointInfo.SessionId against the provided sessionId parameter.

• Failing test: dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/RetrieveIndexAsync_SessionFilter_BugTest.cs
• Files examined: dotnet/src/Microsoft.Agents.AI.Workflows/Checkpointing/FileSystemJsonCheckpointStore.cs, dotnet/src/Microsoft.Agents.AI.Workflows/Checkpointing/ICheckpointStore.cs, dotnet/src/Microsoft.Agents.AI.Workflows/CheckpointInfo.cs, dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/FileSystemJsonCheckpointStoreTests.cs
• Tests run: dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/RetrieveIndexAsync_SessionFilter_BugTest.cs
• Reported version: 1.0-rc1
• Current version: 1.6.1