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Port model field to CustomAgentConfig from reference implementation#208

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Port model field to CustomAgentConfig from reference implementation#208
Copilot wants to merge 3 commits into
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copilot/reference-impl-sync-update-sdk

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Copilot AI commented May 16, 2026 •
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Resolves #ISSUE_NUMBER

Before the change?

  • CustomAgentConfig had no way to specify a per-agent model — all agents used the parent session model.

After the change?

  • Adds model field to CustomAgentConfig (ported from d0eb531 in copilot-sdk).
  • When set, the runtime uses this model for the agent, falling back to the parent session model if unavailable.
  • .lastmerge updated to d0eb531e9ff58ea61f406caa9426f498f6485026
  • pom.xml and scripts/codegen/package.json synced to @github/copilot@^1.0.49-1
var agent = new CustomAgentConfig()
    .setName("fast-reviewer")
    .setModel("claude-haiku-4.5")
    .setPrompt("You are a fast code reviewer.");

Not ported (intentionally)

  • Generated RPC/event type changes (38f38ff, 215676e) — require regeneration via update-copilot-dependency.yml
  • reasoningSummary parameter in Session.cs — depends on generated SessionModelSwitchToParams update

Pull request checklist

  • Tests for the changes have been added (for bug fixes / features)
  • Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • mvn spotless:apply has been run to format the code
  • mvn clean verify passes locally

Does this introduce a breaking change?

  • Yes
  • No

Copilot AI linked an issue May 16, 2026 that may be closed by this pull request
[reference-impl-sync] Reference Implementation sync: 3 new commits (2026-05-16) #207
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Copilot AI and others added 2 commits May 16, 2026 16:35
@edburns
Port model field to CustomAgentConfig from reference implementation
3ebf988 
Adds the 'model' property to CustomAgentConfig, allowing per-agent model
selection (e.g. 'claude-haiku-4.5'). When set, the runtime will use this
model for the agent, falling back to the parent session model if unavailable.

Ports d0eb531 from github/copilot-sdk (#1309).

Co-authored-by: edburns <75821+edburns@users.noreply.github.com>
@edburns
Update .lastmerge to d0eb531e9ff58ea61f406caa9426f498f6485026, sync p…
4bd60ec 
…om.xml CLI version, and update scripts/codegen @github/copilot version

Co-authored-by: edburns <75821+edburns@users.noreply.github.com>
Copilot AI changed the title [WIP] Sync reference implementation with new Copilot SDK commits Port model field to CustomAgentConfig from reference implementation May 16, 2026
Copilot AI requested a review from edburns May 16, 2026 16:51
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[reference-impl-sync] Reference Implementation sync: 3 new commits (2026-05-16)

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