Track full session porting or Continue in Agent Host

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@anthonykim1 is already working on this.

Since Jul 2, 2026.

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Description

agent-host

Related: https://github.com/microsoft/vscode/issues/315193
Related attachment tracking issue: https://github.com/microsoft/vscode/issues/323969
Related scoped PR: https://github.com/microsoft/vscode/pull/323773

Context

PR #323773 handles a narrow attachment case: when a user attaches a Copilot CLI session from Agent Host chat, Agent Host can forward the session's events.jsonl as context.

This issue tracks a different problem: full session porting for continue in flows. In this path, the user is not merely attaching a previous session via the +/context UI. Instead, the old session should become, or be imported into, the active Agent Host conversation.

Attachment vs porting

Flow User intent Mechanism Current PR #323773?
Session attachment Reference another session as context in the current chat Visible session chip plus model-readable attachment, currently events.jsonl for Copilot CLI Yes, only for Copilot CLI events.jsonl sessions
Full session port / continue in Continue/resume an existing session in Agent Host Convert/import/resume the previous session as the active Agent Host conversation No

Porting questions to resolve

  • Which source session types should be portable into Agent Host?
  • What is the canonical source of truth for each source session type?
    • Copilot CLI events.jsonl
    • IChatModel / workbench chat model state
    • provider-specific session content
    • AHP session state
  • How should tool calls, tool results, file edits, approvals, working directory, model selection, and session metadata map into the target Agent Host session?
  • Should porting preserve original session identity or create a new Agent Host session linked back to the source?
  • What should happen when source session data is partial, provider-specific, or unavailable?

Initial matrix

Source session type Example URI Possible source of truth Porting status
EH Copilot CLI copilotcli:/<id> ~/.copilot/session-state/<id>/events.jsonl Needs design
Local Agent Host Copilot CLI agent-host-copilotcli:/<id> AHP state plus Copilot CLI events.jsonl Needs design
Remote Agent Host Copilot CLI remote-<authority>-copilotcli:/<id> Remote AHP state plus remote events.jsonl Needs design
Other Agent Host/AHP sessions provider-specific Agent Host session URI AHP state/provider state Needs design
Local/workbench chat sessions workbench chat session URI IChatModel / chat session model Needs design
Claude Code / other providers provider-specific URI Provider-specific session state Needs design

Non-goal

This issue does not track using a previous session as an attachment/context item. That matrix is tracked in #323969.

/cc @connor4312 @roblourens

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