Decouple remote agent host session type from resource URI scheme

[roblourens]

Decouple ISession.sessionType from the resource URI scheme in RemoteAgentHostSessionsProvider so that remote copilot sessions share the platform copilotcli session type with local and cloud sessions.

Changes

• Session type decoupling: Remote copilot agents now use COPILOT_CLI_SESSION_TYPE (copilotcli) as their logical session type, while the unique per-connection ID remains the resource URI scheme and language model vendor. This lets remote copilot sessions participate in the same platform behaviors as local/cloud copilot sessions.

• Well-known agent mapping: Replace the confusingly-named DEFAULT_AGENT_PROVIDER constant with an explicit WELL_KNOWN_AGENT_SESSION_TYPES map that maps agent host provider names (e.g. copilot) to local platform session types (e.g. copilotcli). Includes wellKnownSessionType() and wellKnownAgentProvider() helpers for forward/reverse lookups.

• Model picker extraction: Extract the remote agent host model picker action, contribution, and helper into a dedicated remoteAgentHostModelPicker.ts file. Consolidate side-effect imports into remoteAgentHost.contribution.ts to reduce import sprawl in sessions.desktop.main.ts.

• Copilot model picker cleanup: Remove the remote agent host guard from the copilot model picker when clause since remote copilot sessions now have their own dedicated model picker.

• Tests & docs: Update test assertions for the new session type values and refresh the REMOTE_AGENT_HOST_SESSIONS_PROVIDER.md documentation with a structured IDs and URI schemes section.

(Written by Copilot)

[github-actions]

Screenshot Changes

Base: 8eb2168b Current: c69d80fa

Changed (1)

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Before	After

[Copilot]

Pull request overview

This PR updates the Sessions window’s remote agent host integration so that remote Copilot sessions use the platform logical session type (COPILOT_CLI_SESSION_TYPE / copilotcli) while keeping routing identifiers (resource URI scheme + LM vendor) as a unique per-connection value. This aligns remote Copilot behavior with local/cloud Copilot sessions without breaking per-host isolation for routing and model registration.

Changes:

• Decouple ISession.sessionType from the remote session resource URI scheme for Copilot (logical type becomes copilotcli; routing stays per-connection).
• Introduce a dedicated remote agent host model picker that filters models by session.resource.scheme (per-connection vendor).
• Consolidate side-effect registrations and update tests/docs to reflect the new identifier split.

Show a summary per file

File	Description
src/vs/sessions/sessions.desktop.main.ts	Removes direct side-effect import of remote agent host actions (now owned by the remote agent host contribution).
src/vs/sessions/contrib/remoteAgentHost/test/common/remoteAgentHostSessionType.test.ts	Updates “wire format” commentary to reflect that routing now uses resource.scheme rather than sessionType.
src/vs/sessions/contrib/remoteAgentHost/test/browser/remoteAgentHostSessionsProvider.test.ts	Updates assertions so remote Copilot sessions report sessionType === copilotcli while preserving per-connection schemes elsewhere.
src/vs/sessions/contrib/remoteAgentHost/common/remoteAgentHostSessionType.ts	Reframes the helper as producing a per-connection identifier used for routing/vendor, not necessarily the logical session type for Copilot.
src/vs/sessions/contrib/remoteAgentHost/browser/remoteAgentHostSessionsProvider.ts	Implements logical session type mapping (Copilot → copilotcli) while keeping resource.scheme and model IDs keyed to the per-connection scheme.
src/vs/sessions/contrib/remoteAgentHost/browser/remoteAgentHostModelPicker.ts	Adds a remote agent host-specific model picker that filters models by session.resource.scheme.
src/vs/sessions/contrib/remoteAgentHost/browser/remoteAgentHost.contribution.ts	Centralizes remote agent host side-effect imports (actions + new model picker).
src/vs/sessions/contrib/remoteAgentHost/REMOTE_AGENT_HOST_SESSIONS_PROVIDER.md	Documents the new split between sessionType, resource.scheme, and LM vendor, including examples.
src/vs/sessions/contrib/copilotChatSessions/browser/copilotChatSessionsActions.ts	Removes remote agent host sessions from the Copilot model picker when clause (remote now has its own picker).

Copilot's findings

• Files reviewed: 9/9 changed files
• Comments generated: 0