Add JSDoc documentation to agentSessionsModel.ts

[Copilot]

Added comprehensive JSDoc documentation to agentSessionsModel.ts following VS Code conventions.

Documentation Coverage

• Exported interfaces: IAgentSessionsModel, IAgentSession with all events, properties, and methods
• Internal interfaces: IAgentSessionData, IInternalAgentSessionData, IAgentSessionState, serialization types
• Type guards: isLocalAgentSessionItem(), isAgentSession(), isAgentSessionsModel()
• Utility functions: getAgentChangesSummary() with parameter and return documentation
• Classes: AgentSessionsModel, AgentSessionsCache with lifecycle and responsibility descriptions
• Public methods: All methods document parameters, return values, and behavior

Documentation follows established patterns:

• Class-level docs explain responsibilities and lifecycle
• Method docs include @param and @returns tags
• Type guards clearly indicate their purpose and return conditions
• Inline property docs for nested structures (timing, state)

Example:

/**
 * Type guard to determine if an object is an agent session.
 *
 * @param obj The object to check.
 * @returns `true` if the object is an IAgentSession, `false` otherwise.
 */
export function isAgentSession(obj: IAgentSessionsModel | IAgentSession): obj is IAgentSession {
	const session = obj as IAgentSession | undefined;
	return URI.isUri(session?.resource);
}

Original prompt

add jsdoc to #file:agentSessionsModel.ts

The user has attached the following file paths as relevant context:

• src/vs/workbench/contrib/chat/browser/agentSessions/agentSessionsModel.ts
• .github/instructions/learnings.instructions.md
• .github/copilot-instructions.md
• .github/copilot-instructions.md
• AGENTS.md

Created from VS Code.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.