docs: document EnableSessionStore and one-shot session guidance

dotnet/README.md

@@ -131,6 +131,7 @@ Create a new conversation session.
 - `Provider` - Custom API provider configuration (BYOK)
 - `Streaming` - Enable streaming of response chunks (default: false)
 - `InfiniteSessions` - Configure automatic context compaction (see below)
+- `EnableSessionStore` - Enables the cross-session store for search and retrieval across sessions. When unset in `CopilotClientMode.CopilotCli`, the runtime default applies (enabled). In `CopilotClientMode.Empty`, defaults to disabled.
 - `OnPermissionRequest` - Optional handler called before each tool execution to approve or deny it. When omitted, permission requests are emitted as events and left pending for manual resolution. Use `PermissionHandler.ApproveAll` to allow everything, or provide a custom function for fine-grained control. See [Permission Handling](#permission-handling) section.
 - `OnUserInputRequest` - Handler for user input requests from the agent (enables ask_user tool). See [User Input Requests](#user-input-requests) section.
 - `Hooks` - Hook handlers for session lifecycle events. See [Session Hooks](#session-hooks) section.

go/README.md

@@ -221,6 +221,7 @@ Event types: `SessionLifecycleCreated`, `SessionLifecycleDeleted`, `SessionLifec
 - `Provider` (\*ProviderConfig): Custom API provider configuration (BYOK). See [Custom Providers](#custom-providers) section.
 - `Streaming` (*bool): Enable streaming delta events (nil = runtime default)
 - `InfiniteSessions` (\*InfiniteSessionConfig): Automatic context compaction configuration
+- `EnableSessionStore` (\*bool): Enables the cross-session store for search and retrieval across sessions. When unset in `ModeCopilotCli`, the runtime default applies (enabled). In `ModeEmpty`, defaults to disabled.
 - `OnPermissionRequest` (PermissionHandlerFunc): Optional handler called before each tool execution to approve or deny it. When nil, permission requests are emitted as events and left pending for manual resolution. Use `copilot.PermissionHandler.ApproveAll` to allow everything, or provide a custom function for fine-grained control. See [Permission Handling](#permission-handling) section.
 - `OnUserInputRequest` (UserInputHandler): Handler for user input requests from the agent (enables ask_user tool). See [User Input Requests](#user-input-requests) section.
 - `Hooks` (\*SessionHooks): Hook handlers for session lifecycle events. See [Session Hooks](#session-hooks) section.

java/README.md

@@ -239,6 +239,10 @@ Chain fluent modifiers to set tool options:
 
 For design context and decision rationale, see [ADR-006](docs/adr/adr-006-tool-definition-inline.md).
 
+## Session Store
+
+`enableSessionStore` on `SessionConfig` enables the cross-session store for search and retrieval across sessions. When unset in the default `CopilotClientMode.COPILOT_CLI` mode, the runtime default applies (enabled). In `CopilotClientMode.EMPTY` mode, defaults to disabled.
+
 ## Memory
 
 Sessions can opt into persistent memory, allowing the agent to read and write memory across turns. Memory is configured per session and applies to both `createSession` and `resumeSession`.

nodejs/README.md

@@ -135,6 +135,7 @@ Create a new conversation session.
 - `tools?: Tool[]` - Custom tools exposed to the CLI. Tools without `handler` are declaration-only and must be resolved via pending tool-call RPCs.
 - `systemMessage?: SystemMessageConfig` - System message customization (see below)
 - `infiniteSessions?: InfiniteSessionConfig` - Configure automatic context compaction (see below)
+- `enableSessionStore?: boolean` - Enables the cross-session store for search and retrieval across sessions. When unset in `"copilot-cli"` mode, the runtime default applies (enabled). In `"empty"` mode, defaults to disabled.
 - `provider?: ProviderConfig` - Custom API provider configuration (BYOK - Bring Your Own Key). See [Custom Providers](#custom-providers) section.
 - `onPermissionRequest?: PermissionHandler` - Optional handler called before each tool execution to approve or deny it. When omitted, permission requests are emitted as events and left pending for manual resolution. Use `approveAll` to allow everything, or provide a custom function for fine-grained control. See [Permission Handling](#permission-handling) section.
 - `onUserInputRequest?: UserInputHandler` - Handler for user input requests from the agent. Enables the `ask_user` tool. See [User Input Requests](#user-input-requests) section.

python/README.md

@@ -279,6 +279,7 @@ These are passed as keyword arguments to `create_session()`:
 - `streaming` (bool): Enable streaming delta events
 - `provider` (ProviderConfig): Custom API provider configuration (BYOK). See [Custom Providers](#custom-providers) section.
 - `infinite_sessions` (InfiniteSessionConfig): Automatic context compaction configuration
+- `enable_session_store` (bool): Enables the cross-session store for search and retrieval across sessions. When unset in `"copilot-cli"` mode, the runtime default applies (enabled). In `"empty"` mode, defaults to disabled.
 - `on_permission_request` (callable): Optional handler called before each tool execution to approve or deny it. When omitted, permission requests are emitted as events and left pending for manual resolution. Use `PermissionHandler.approve_all` to allow everything, or provide a custom function for fine-grained control. See [Permission Handling](#permission-handling) section.
 - `on_user_input_request` (callable): Handler for user input requests from the agent (enables ask_user tool). See [User Input Requests](#user-input-requests) section.
 - `hooks` (SessionHooks): Hook handlers for session lifecycle events. See [Session Hooks](#session-hooks) section.

rust/README.md

@@ -591,6 +591,8 @@ config.infinite_sessions = Some(infinite);
 
 The CLI emits `session.compaction_start` / `session.compaction_complete` events around each compaction. The session id remains stable across compactions; resume with `Client::resume_session` to pick up a prior conversation. Workspace state lives under `~/.copilot/session-state/{sessionId}` by default — override with `workspace_path` to relocate.
 
+`enable_session_store` on `SessionConfig` enables the cross-session store for search and retrieval across sessions. When unset in the default client mode, the runtime default applies (enabled). In `Empty` mode, defaults to disabled.
+
 ### Memory
 
 Configure the runtime memory feature for a session: