feat(cli): add agent mode command

Add the `paseo agent mode` command for changing and listing agent
operational modes. Supports setting a mode or listing available modes
with the --list flag.

Usage:
  paseo agent mode <id> <mode>     # Set mode
  paseo agent mode --list <id>     # List available modes

packages/cli/src/commands/agent/index.ts

@@ -3,6 +3,7 @@ import { runPsCommand } from './ps.js'
 import { runRunCommand } from './run.js'
 import { runSendCommand } from './send.js'
 import { runStopCommand } from './stop.js'
+import { runModeCommand } from './mode.js'
 import { withOutput } from '../../output/index.js'
 
 export function createAgentCommand(): Command {
@@ -47,5 +48,14 @@ export function createAgentCommand(): Command {
     .option('--host <host>', 'Daemon host:port (default: localhost:6767)')
     .action(withOutput(runStopCommand))
 
+  agent
+    .command('mode')
+    .description("Change an agent's operational mode")
+    .argument('<id>', 'Agent ID (or prefix)')
+    .argument('[mode]', 'Mode to set (required unless --list)')
+    .option('--list', 'List available modes for this agent')
+    .option('--host <host>', 'Daemon host:port (default: localhost:6767)')
+    .action(withOutput(runModeCommand))
+
   return agent
 }

packages/cli/src/commands/agent/mode.ts

@@ -0,0 +1,154 @@
+import type { Command } from 'commander'
+import { connectToDaemon, getDaemonHost, resolveAgentId } from '../../utils/client.js'
+import type {
+  CommandOptions,
+  OutputSchema,
+  CommandError,
+  AnyCommandResult,
+} from '../../output/index.js'
+
+/** Mode item for list display */
+export interface ModeListItem {
+  id: string
+  label: string
+  description: string
+}
+
+/** Result for setting mode */
+export interface SetModeResult {
+  agentId: string
+  mode: string
+}
+
+/** Schema for mode list output */
+export const modeListSchema: OutputSchema<ModeListItem> = {
+  idField: 'id',
+  columns: [
+    { header: 'MODE', field: 'id', width: 15 },
+    { header: 'LABEL', field: 'label', width: 25 },
+    { header: 'DESCRIPTION', field: 'description', width: 40 },
+  ],
+}
+
+/** Schema for set mode output */
+export const setModeSchema: OutputSchema<SetModeResult> = {
+  idField: 'agentId',
+  columns: [
+    { header: 'AGENT ID', field: 'agentId', width: 12 },
+    { header: 'MODE', field: 'mode', width: 20 },
+  ],
+}
+
+export interface AgentModeOptions extends CommandOptions {
+  list?: boolean
+}
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export type AgentModeResult = AnyCommandResult<any>
+
+export async function runModeCommand(
+  id: string,
+  mode: string | undefined,
+  options: AgentModeOptions,
+  _command: Command
+): Promise<AgentModeResult> {
+  const host = getDaemonHost({ host: options.host as string | undefined })
+
+  // Validate arguments
+  if (!options.list && !mode) {
+    const error: CommandError = {
+      code: 'MISSING_ARGUMENT',
+      message: 'Mode argument required unless --list is specified',
+      details: 'Usage: paseo agent mode <id> <mode> | paseo agent mode --list <id>',
+    }
+    throw error
+  }
+
+  let client
+  try {
+    client = await connectToDaemon({ host: options.host as string | undefined })
+  } catch (err) {
+    const message = err instanceof Error ? err.message : String(err)
+    const error: CommandError = {
+      code: 'DAEMON_NOT_RUNNING',
+      message: `Cannot connect to daemon at ${host}: ${message}`,
+      details: 'Start the daemon with: paseo daemon start',
+    }
+    throw error
+  }
+
+  try {
+    // Request session state to get agent information
+    client.requestSessionState()
+
+    // Wait a moment for the session state to be populated
+    await new Promise((resolve) => setTimeout(resolve, 500))
+
+    const agents = client.listAgents()
+
+    // Resolve agent ID
+    const resolvedId = resolveAgentId(id, agents)
+    if (!resolvedId) {
+      const error: CommandError = {
+        code: 'AGENT_NOT_FOUND',
+        message: `No agent found matching: ${id}`,
+        details: 'Use `paseo agent ps` to list available agents',
+      }
+      throw error
+    }
+
+    const agent = agents.find((a) => a.id === resolvedId)
+    if (!agent) {
+      const error: CommandError = {
+        code: 'AGENT_NOT_FOUND',
+        message: `Agent not found after resolution: ${resolvedId}`,
+      }
+      throw error
+    }
+
+    if (options.list) {
+      // List available modes for this agent
+      const availableModes = agent.availableModes ?? []
+
+      await client.close()
+
+      const items: ModeListItem[] = availableModes.map((m) => ({
+        id: m.id,
+        label: m.label ?? m.id,
+        description: m.description ?? '',
+      }))
+
+      return {
+        type: 'list',
+        data: items,
+        schema: modeListSchema,
+      }
+    } else {
+      // Set the agent mode
+      await client.setAgentMode(resolvedId, mode!)
+
+      await client.close()
+
+      return {
+        type: 'single',
+        data: {
+          agentId: resolvedId.slice(0, 7),
+          mode: mode!,
+        },
+        schema: setModeSchema,
+      }
+    }
+  } catch (err) {
+    await client.close().catch(() => {})
+    // Re-throw if it's already a CommandError
+    if (err && typeof err === 'object' && 'code' in err) {
+      throw err
+    }
+    const message = err instanceof Error ? err.message : String(err)
+    const error: CommandError = {
+      code: 'MODE_OPERATION_FAILED',
+      message: `Failed to ${options.list ? 'list modes' : 'set mode'}: ${message}`,
+    }
+    throw error
+  }
+}