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.NET: Remove required token params from HarnessAgent, make compaction opt-in (#6409)

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* Move token params from HarnessAgent constructor to options

Remove the required maxContextWindowTokens and maxOutputTokens
constructor parameters from HarnessAgent and AsHarnessAgent, replacing
them with optional MaxContextWindowTokens and MaxOutputTokens properties
on HarnessAgentOptions.

When both values are provided, compaction is enabled as before (in-loop
CompactionProvider and chat reducer on the default InMemoryChatHistory
Provider). When either is null, compaction is disabled entirely, making
it opt-in.

New constructor: HarnessAgent(IChatClient, HarnessAgentOptions?,
ILoggerFactory?, IServiceProvider?)

Closes #6333

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

* Improving comments.

* feat: Add custom CompactionStrategy and DisableCompaction to HarnessAgentOptions

Allow users to provide their own CompactionStrategy via options, with
a clear priority system:
1. DisableCompaction=true: no compaction regardless of other settings
2. Custom CompactionStrategy provided: use it (token params ignored)
3. Both MaxContextWindowTokens and MaxOutputTokens set: default strategy
4. Otherwise: no compaction

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

* fix: Address PR review comments on compaction opt-in

- Update chatClient param XML doc to reflect compaction is opt-in
- Strengthen compaction tests to assert ChatReducer is null/not-null
  rather than just asserting construction succeeds

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

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
westey
2026-06-09 13:06:00 +00:00
committed by GitHub
co-authored by Copilot
parent 9486c76ef8
commit 96d242fa7f
8 changed files with 346 additions and 150 deletions
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dotnet/samples/02-agents/Harness/Harness_Step04_CodeExecution/Program.cs
+3 -1
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@@ -89,8 +89,10 @@ AIAgent agent =
.GetProjectOpenAIClient()
.GetResponsesClient()
.AsIChatClient(deploymentName)
.AsHarnessAgent(MaxContextWindowTokens, MaxOutputTokens, new HarnessAgentOptions
.AsHarnessAgent(new HarnessAgentOptions
{
MaxContextWindowTokens = MaxContextWindowTokens,
MaxOutputTokens = MaxOutputTokens,
Name = "CodeExecutionAgent",
Description = "A technical assistant with sandboxed code execution and skill-based workflows.",
OpenTelemetrySourceName = TracingSourceName,