* agentHost: adopt channel-based AHP wire model
Adopts the channel-based Agent Host Protocol revision from
microsoft/agent-host-protocol#127. Subscriptions, action delivery, and
protocol notifications now all route over named channels identified by a
top-level `channel: URI` field, replacing the pre-channels subscribe /
dispatch / notify model.
- Renames `ROOT_STATE_URI` from `agenthost:/root` to `ahp-root://` and
adds an `isAhpRootChannel` helper that tolerates both the canonical
wire form and the workbench `URI` round-tripped form (`ahp-root:`).
- Threads a `channel` parameter through every action dispatch path:
`IAgentService.dispatchAction`, `IAgentConnection.dispatch`,
`AgentHostStateManager.dispatchServerAction` / `dispatchClientAction`,
and `AgentSubscriptionManager.dispatchOptimistic`. Individual action
payloads no longer carry `session` / `terminal` / `changeset` fields;
the envelope carries the channel.
- Replaces the `{ method: 'notification', params: { notification } }`
wrapper with top-level JSON-RPC methods (`root/sessionAdded`,
`root/sessionRemoved`, `root/sessionSummaryChanged`, `auth/required`).
Each notification's params now carry their own `channel: URI` field.
- Renames the per-command identifying field to `channel` for the channel-
scoped commands (`createSession`, `disposeSession`, `createTerminal`,
`disposeTerminal`, `fetchTurns`, `completions`,
`invokeChangesetOperation`). Connection-level commands hard-code the
root channel string.
- Updates the subscribe result to `{ snapshot? }` and the
`SubscribeParams` / `UnsubscribeParams` field name from `resource` to
`channel`.
- Drops the removed `ProtocolNotification`, `NotificationType`,
`NotificationMethodParams`, and `NotificationMap` exports; provides a
thin compat `NotificationType` constant keyed by method name for
consumers that still discriminate notification variants.
- Adapts `AgentSubscription` routing to switch on `envelope.channel`
rather than inspecting per-action URI fields (`_isRelevantEnvelope`
replaces `_isRelevantAction`).
- Migrates all producers (`agentService`, `agentSideEffects`,
`agentConfigurationService`, `agentHostChangesetService`,
`agentHostTerminalManager`, `agentHostStateManager`,
`protocolServerHandler`, Claude/Copilot agent sessions, terminal
manager, etc.) and consumers (workbench session handler, terminal
contribution, pty, customization harness, provider tests) to the new
shapes.
(Commit message generated by Copilot)
* agentHost: address Copilot review for channels migration
Addresses feedback from Copilot's review of #317251:
- Update real-SDK integration test helpers and protocol integration
tests to use the channel-based command shapes (rename `session` /
`resource` to `channel`, add `channel: 'ahp-root://'` to
connection-level commands, drop `session` from action payloads, route
via params-level `channel`).
- Treat the canonical `ahp-root://` and the URI-normalized `ahp-root:`
forms as equivalent in `_isRelevantToClient` so root broadcasts reach
a client that subscribed using either form (mirrors `isAhpRootChannel`
already in use elsewhere).
- Drop a `..` hop from the `NotificationType` import path in the local
and remote session-provider tests; import from
`state/sessionActions.js` directly.
- Drop a stale post-merge `session: SESSION_STR` in
`claudeMapSessionEvents.test.ts:Test 9.5` and the matching
`requestResourceAccess` test expectation in
`agentHostFileSystemProvider.test.ts` so they match the new
channel-based shapes (root cause of the macOS browser CI failure).
(Commit message generated by Copilot)
* tests
* import
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