diff --git a/src/renderer/src/components/terminal-pane/remote-runtime-pty-transport.ts b/src/renderer/src/components/terminal-pane/remote-runtime-pty-transport.ts
index b2133318648..da18e1a2edb 100644
--- a/src/renderer/src/components/terminal-pane/remote-runtime-pty-transport.ts
+++ b/src/renderer/src/components/terminal-pane/remote-runtime-pty-transport.ts
@@ -1,13 +1,11 @@
 import { parseTerminalAttachmentLaunchResult } from '../../../../shared/terminal-attachment-launch-result'
-import {
-  terminalLaunchFacts,
-  agentProviderSessionForEnsure
-} from '../../../../shared/agent-session-resume'
+import { terminalLaunchFacts } from '../../../../shared/agent-session-resume'
 import { isRuntimeCompatBlockError } from '@/runtime/runtime-protocol-compat'
 import { runtimeEnvironmentSupportsCapability } from '@/runtime/runtime-rpc-client'
 import { readTerminalSpawnDeferral } from '../../../../shared/host-spawn-admission'
 import { remoteRestoreSpawnIntentParams } from '../../runtime/remote-restore-spawn-intent'
 import { createAgentSessionKeyboardOptions } from '@/runtime/agent-session-keyboard-capability'
+import { agentProviderSessionForHostEnsure } from '@/runtime/agent-session-ensure-provider-session'
 import { createRemoteRuntimeDisconnectedInputGrace } from './remote-runtime-disconnected-input-grace'
 import {
   createRemoteRuntimeRecoveryInputHold,
@@ -3518,10 +3516,16 @@ export function createRemoteRuntimePtyTransport(
         )
       const hostAuthorityCreate = async (epoch = connectLifecycleEpoch) => {
         const keyboardOptions = await agentKeyboardOptions(createEnvironmentId)
+        const ensureProviderSession = resumeProviderSessionToSend
+          ? await agentProviderSessionForHostEnsure(
+              createEnvironmentId,
+              resumeProviderSessionToSend
+            )
+          : undefined
         return createWithUnknownOutcomeRecovery(
           'agent-session',
           (timeoutMs) =>
-            resumeProviderSessionToSend
+            ensureProviderSession
               ? callRuntimeForEnvironment<RuntimeEnsureAgentSessionResult>(
                   createEnvironmentId,
                   'terminal.ensureAgentSession',
@@ -3531,7 +3535,7 @@ export function createRemoteRuntimePtyTransport(
                     ...originOptions,
                     worktree: toRuntimeTerminalWorktreeSelector(worktreeId),
                     agent: launchAgentToSend!,
-                    providerSession: agentProviderSessionForEnsure(resumeProviderSessionToSend),
+                    providerSession: ensureProviderSession,
                     ...(launchConfigToSend?.ompResumeFilePath
                       ? { ompResumeFilePath: launchConfigToSend.ompResumeFilePath }
                       : {}),
diff --git a/src/renderer/src/runtime/agent-session-ensure-provider-session.ts b/src/renderer/src/runtime/agent-session-ensure-provider-session.ts
new file mode 100644
index 00000000000..15ef77eddc5
--- /dev/null
+++ b/src/renderer/src/runtime/agent-session-ensure-provider-session.ts
@@ -0,0 +1,29 @@
+import type { AgentProviderSessionMetadata } from '../../../shared/agent-session-resume'
+import { AGENT_SESSION_RESUME_EFFORT_RUNTIME_CAPABILITY } from '../../../shared/agent-session-create-capabilities'
+import { runtimeEnvironmentSupportsCapability } from './runtime-rpc-client'
+import { isRuntimeCompatBlockError } from './runtime-protocol-compat'
+
+/** The provider session an ensureAgentSession call may send to this host; older hosts' strict schema rejects `cwd` and `effort`. */
+export async function agentProviderSessionForHostEnsure(
+  environmentId: string,
+  providerSession: AgentProviderSessionMetadata
+): Promise<AgentProviderSessionMetadata> {
+  const { cwd: _cwd, effort, ...identity } = providerSession
+  return effort && (await hostAcceptsResumeEffort(environmentId))
+    ? { ...identity, effort }
+    : identity
+}
+
+async function hostAcceptsResumeEffort(environmentId: string): Promise<boolean> {
+  try {
+    return await runtimeEnvironmentSupportsCapability(
+      environmentId,
+      AGENT_SESSION_RESUME_EFFORT_RUNTIME_CAPABILITY
+    )
+  } catch (error) {
+    if (isRuntimeCompatBlockError(error)) {
+      throw error
+    }
+    return false
+  }
+}
diff --git a/src/renderer/src/runtime/web-runtime-terminal-create-operation.ts b/src/renderer/src/runtime/web-runtime-terminal-create-operation.ts
index 257c2a085cd..01184bb175a 100644
--- a/src/renderer/src/runtime/web-runtime-terminal-create-operation.ts
+++ b/src/renderer/src/runtime/web-runtime-terminal-create-operation.ts
@@ -3,7 +3,7 @@ import { createAgentSessionKeyboardOptions } from './agent-session-keyboard-capa
 import type { RuntimeRpcResponse } from '../../../shared/runtime-rpc-envelope'
 import type { RuntimeMobileSessionCreateTerminalResult } from '../../../shared/runtime-types'
 import { toRuntimeExecutionHostId } from '../../../shared/execution-host'
-import { agentProviderSessionForEnsure } from '../../../shared/agent-session-resume'
+import { agentProviderSessionForHostEnsure } from './agent-session-ensure-provider-session'
 import { translate } from '../i18n/i18n'
 import { useAppStore } from '../store'
 import { agentResumeHostAuthorityCapability } from './agent-resume-host-authority-capability'
@@ -110,7 +110,10 @@ export async function createWebRuntimeSessionTerminalResult(
                         kind: 'explicit',
                         worktree: toRuntimeWorktreeSelector(args.worktreeId),
                         agent,
-                        providerSession: agentProviderSessionForEnsure(args.providerSession!),
+                        providerSession: await agentProviderSessionForHostEnsure(
+                          environmentId,
+                          args.providerSession!
+                        ),
                         ...(args.launchConfig?.ompResumeFilePath
                           ? { ompResumeFilePath: args.launchConfig.ompResumeFilePath }
                           : {}),
diff --git a/src/shared/agent-effort-level.ts b/src/shared/agent-effort-level.ts
new file mode 100644
index 00000000000..23f9b8eafd8
--- /dev/null
+++ b/src/shared/agent-effort-level.ts
@@ -0,0 +1,6 @@
+// Why a shape, not Claude's level list: a level a newer Claude adds must still round-trip into argv.
+export const AGENT_EFFORT_LEVEL = /^[a-z][a-z0-9-]{0,31}$/
+
+export function readAgentEffortLevel(value: unknown): string | undefined {
+  return typeof value === 'string' && AGENT_EFFORT_LEVEL.test(value) ? value : undefined
+}
diff --git a/src/shared/agent-hook-listener-claude-turn-state.test.ts b/src/shared/agent-hook-listener-claude-turn-state.test.ts
index 07420b6c4c6..f42d9c82809 100644
--- a/src/shared/agent-hook-listener-claude-turn-state.test.ts
+++ b/src/shared/agent-hook-listener-claude-turn-state.test.ts
@@ -131,6 +131,51 @@ describe('shared agent-hook-listener', () => {
     expect(resumedElsewhere?.providerSession?.cwd).toBe('/elsewhere')
   })
 
+  it("records a Claude session's live effort and keeps it across hooks that omit it", () => {
+    const sessionId = '88888888-8888-4888-8888-888888888888'
+    const prompt = normalizeAndAccept(state, 'claude', {
+      hook_event_name: 'UserPromptSubmit',
+      session_id: sessionId,
+      prompt: 'go'
+    })
+    normalizeAndAccept(state, 'claude', {
+      hook_event_name: 'PreToolUse',
+      session_id: sessionId,
+      tool_name: 'Bash',
+      effort: { level: 'max' }
+    })
+    // Subagent hooks name the parent session but report the subagent's own effort.
+    const subagent = normalizeAndAccept(state, 'claude', {
+      hook_event_name: 'PostToolUse',
+      session_id: sessionId,
+      agent_id: 'agent-1',
+      tool_name: 'Read',
+      effort: { level: 'low' }
+    })
+    const nextPrompt = normalizeAndAccept(state, 'claude', {
+      hook_event_name: 'UserPromptSubmit',
+      session_id: sessionId,
+      prompt: 'again'
+    })
+    // /clear starts a new session id in the same process, which keeps its effort.
+    const cleared = normalizeAndAccept(state, 'claude', {
+      hook_event_name: 'SessionStart',
+      source: 'clear',
+      session_id: '99999999-9999-4999-8999-999999999999'
+    })
+    const otherSession = normalizeAndAccept(state, 'claude', {
+      hook_event_name: 'SessionStart',
+      source: 'startup',
+      session_id: 'aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa'
+    })
+
+    expect(prompt?.providerSession?.effort).toBeUndefined()
+    expect(subagent?.providerSession?.effort).toBe('max')
+    expect(nextPrompt?.providerSession?.effort).toBe('max')
+    expect(cleared?.providerSession?.effort).toBe('max')
+    expect(otherSession?.providerSession?.effort).toBeUndefined()
+  })
+
   it('resets stale Claude turn state when SessionStart announces a new session on the pane', () => {
     normalizeAndAccept(state, 'claude', { hook_event_name: 'UserPromptSubmit', prompt: 'fix bug' })
     normalizeAndAccept(state, 'claude', {
diff --git a/src/shared/agent-hook-listener/pane-provider-session.ts b/src/shared/agent-hook-listener/pane-provider-session.ts
index 33d24770f85..2b30227dcad 100644
--- a/src/shared/agent-hook-listener/pane-provider-session.ts
+++ b/src/shared/agent-hook-listener/pane-provider-session.ts
@@ -1,4 +1,5 @@
 import type { AgentHookSource } from '../agent-hook-relay'
+import { readAgentEffortLevel } from '../agent-effort-level'
 import {
   extractAgentProviderSession,
   readPathFromKeys,
@@ -25,28 +26,69 @@ export function readPaneProviderSession(
   if (!providerSession) {
     return null
   }
-  const cwd = readAgentCwd(state, source, paneKey, providerSession.id, hookPayload)
-  return cwd ? { ...providerSession, cwd } : providerSession
+  const continued = continuedProviderSession(
+    state,
+    source,
+    paneKey,
+    providerSession.id,
+    hookPayload
+  )
+  const cwd = readAgentCwd(source, hookPayload, continued)
+  const effort = readClaudeEffort(source, hookPayload, continued)
+  return {
+    ...providerSession,
+    ...(cwd ? { cwd } : {}),
+    ...(effort ? { effort } : {})
+  }
 }
 
-/** The folder the pane's agent started in. Only Claude/Codex hooks are known to report it (Cursor's cwd is a shell command's). */
-function readAgentCwd(
+/** The pane's previous session when this hook continues it; /clear and compact restart Claude in the same process. */
+function continuedProviderSession(
   state: HookListenerState,
   source: AgentHookSource,
   paneKey: string,
   sessionId: string,
   hookPayload: Record<string, unknown>
-): string | undefined {
-  if (source !== 'claude' && source !== 'codex') {
-    return undefined
-  }
+): AgentProviderSessionMetadata | undefined {
   const previous = state.lastStatusByPaneKey.get(paneKey)
-  const previousCwd = previous?.source === source ? previous.providerSession?.cwd : undefined
-  // Claude's hook cwd follows its Bash tool's `cd`; /clear and compact restart in the same process.
-  const keepsPreviousFolder =
+  const continues =
     previous?.providerSession?.id === sessionId ||
     (source === 'claude' &&
       hookPayload.hook_event_name === 'SessionStart' &&
       (hookPayload.source === 'clear' || hookPayload.source === 'compact'))
-  return previousCwd && keepsPreviousFolder ? previousCwd : readPathFromKeys(hookPayload, ['cwd'])
+  return previous?.source === source && continues ? previous.providerSession : undefined
+}
+
+/** The folder the pane's agent started in. Only Claude/Codex hooks are known to report it (Cursor's cwd is a shell command's). */
+function readAgentCwd(
+  source: AgentHookSource,
+  hookPayload: Record<string, unknown>,
+  continued: AgentProviderSessionMetadata | undefined
+): string | undefined {
+  if (source !== 'claude' && source !== 'codex') {
+    return undefined
+  }
+  // Claude's hook cwd follows its Bash tool's `cd`.
+  return continued?.cwd ?? readPathFromKeys(hookPayload, ['cwd'])
+}
+
+/** Claude 2.1.133+ reports `effort.level` on tool and Stop hooks only, so other events keep the last one. */
+function readClaudeEffort(
+  source: AgentHookSource,
+  hookPayload: Record<string, unknown>,
+  continued: AgentProviderSessionMetadata | undefined
+): string | undefined {
+  if (source !== 'claude') {
+    return undefined
+  }
+  const effort = hookPayload.effort
+  // Why skip subagents: their hooks name the parent session but report the subagent's own effort.
+  const reported =
+    typeof effort === 'object' &&
+    effort !== null &&
+    'level' in effort &&
+    !readString(hookPayload, 'agent_id')
+      ? readAgentEffortLevel(effort.level)
+      : undefined
+  return reported ?? continued?.effort
 }
diff --git a/src/shared/agent-resume-argv.ts b/src/shared/agent-resume-argv.ts
index 52c93600d52..ad108bb5510 100644
--- a/src/shared/agent-resume-argv.ts
+++ b/src/shared/agent-resume-argv.ts
@@ -11,7 +11,14 @@ export function getAgentResumeArgv(
     case 'codebuddy':
       return providerSession.key === 'session_id' ? ['codebuddy', '--resume', id] : null
     case 'claude':
-      return providerSession.key === 'session_id' ? ['claude', '--resume', id] : null
+      return providerSession.key === 'session_id'
+        ? [
+            'claude',
+            ...(providerSession.effort ? ['--effort', providerSession.effort] : []),
+            '--resume',
+            id
+          ]
+        : null
     case 'cursor':
       return providerSession.key === 'conversation_id' ? ['cursor-agent', '--resume', id] : null
     case 'codex':
diff --git a/src/shared/agent-resume-launch-command.spec.ts b/src/shared/agent-resume-launch-command.spec.ts
index 1fbd103485e..437fd024759 100644
--- a/src/shared/agent-resume-launch-command.spec.ts
+++ b/src/shared/agent-resume-launch-command.spec.ts
@@ -565,3 +565,32 @@ describe('buildAgentResumeStartupPlan claude selector guard', () => {
     expect(restored?.launchConfig.agentCommand).toBe("claude '--resume'")
   })
 })
+
+describe('buildAgentResumeStartupPlan claude effort', () => {
+  it.each(SHELLS)(
+    "resumes at the session's effort after a stale launch flag ($platform/$shell)",
+    ({ platform, shell }) => {
+      const session = { ...providerSession, effort: 'max' }
+      const restored = buildAgentResumeStartupPlan({
+        agent: 'claude',
+        providerSession: session,
+        cmdOverrides: {},
+        agentArgs: '--effort low',
+        platform,
+        shell
+      })
+      const command = restored?.launchCommand ?? ''
+      const tokens = tokenizeStartupCommand(command, shell)
+      // Claude keeps the last --effort it parses.
+      expect(tokens.ok && tokens.tokens.slice(-6)).toEqual([
+        '--effort',
+        'low',
+        '--effort',
+        'max',
+        ...RESUME
+      ])
+      // The saved launch recipe stays the user's own.
+      expect(restored?.launchConfig.agentArgs).toBe('--effort low')
+    }
+  )
+})
diff --git a/src/shared/agent-resume-record-equivalence.ts b/src/shared/agent-resume-record-equivalence.ts
index 1129bf84cfa..62a0c55949b 100644
--- a/src/shared/agent-resume-record-equivalence.ts
+++ b/src/shared/agent-resume-record-equivalence.ts
@@ -61,6 +61,8 @@ export function recoveryRecordMatches(
     existing.state === next.state &&
     agentMainAgentVerdict(existing) === agentMainAgentVerdict(next) &&
     agentProviderSessionsEqual(existing.agent, existing.providerSession, next.providerSession) &&
+    // Why: effort is not session identity, but a stale level would resume at the wrong effort.
+    existing.providerSession.effort === next.providerSession.effort &&
     launchConfigsEqual(existing.launchConfig, next.launchConfig)
   )
 }
diff --git a/src/shared/agent-session-create-capabilities.ts b/src/shared/agent-session-create-capabilities.ts
index 026c8ac1928..cec66a663e3 100644
--- a/src/shared/agent-session-create-capabilities.ts
+++ b/src/shared/agent-session-create-capabilities.ts
@@ -18,6 +18,10 @@ export const AGENT_SESSION_ACCOUNT_ENV_RUNTIME_CAPABILITY = 'agent-session.accou
 // Send is strict: advertise skills before sending selected paths; name-based agents still use the $name text.
 export const AGENT_SESSION_SEND_SKILLS_RUNTIME_CAPABILITY = 'agent-session.send-skills.v1' as const
 
+// Ensure is strict: send a resumed Claude session's effort only to hosts advertising support.
+export const AGENT_SESSION_RESUME_EFFORT_RUNTIME_CAPABILITY =
+  'agent-session.resume-effort.v1' as const
+
 export const AGENT_SESSION_SEND_USAGE_LIMIT_CONTINUATION_RUNTIME_CAPABILITY =
   'agent-session.send-usage-limit-continuation.v1' as const
 
@@ -28,5 +32,6 @@ export const AGENT_SESSION_CREATE_RUNTIME_CAPABILITIES = [
   AGENT_SESSION_CREATE_TAB_PLACEMENT_RUNTIME_CAPABILITY,
   AGENT_SESSION_SEND_OPTIONS_RUNTIME_CAPABILITY,
   AGENT_SESSION_ACCOUNT_ENV_RUNTIME_CAPABILITY,
-  AGENT_SESSION_SEND_SKILLS_RUNTIME_CAPABILITY
+  AGENT_SESSION_SEND_SKILLS_RUNTIME_CAPABILITY,
+  AGENT_SESSION_RESUME_EFFORT_RUNTIME_CAPABILITY
 ] as const
diff --git a/src/shared/agent-session-resume.test.ts b/src/shared/agent-session-resume.test.ts
index 1790a442d8e..af6f99e6e09 100644
--- a/src/shared/agent-session-resume.test.ts
+++ b/src/shared/agent-session-resume.test.ts
@@ -65,6 +65,11 @@ describe('agent session resume metadata', () => {
 
   it.each([
     ['claude', { key: 'session_id', id: 's1' }, ['claude', '--resume', 's1']],
+    [
+      'claude',
+      { key: 'session_id', id: 's1', effort: 'max' },
+      ['claude', '--effort', 'max', '--resume', 's1']
+    ],
     ['codebuddy', { key: 'session_id', id: 's1' }, ['codebuddy', '--resume', 's1']],
     ['codex', { key: 'session_id', id: 's1' }, ['codex', 'resume', 's1']],
     ['gemini', { key: 'session_id', id: 's1' }, ['gemini', '--resume', 's1']],
@@ -168,6 +173,18 @@ describe('agent session resume metadata', () => {
       })
     ).toEqual({ key: 'session_id', id: 'ok' })
   })
+
+  it('round-trips a Claude effort level and drops values unsafe for argv', () => {
+    expect(normalizeAgentProviderSession({ key: 'session_id', id: 'ok', effort: 'xhigh' })).toEqual(
+      { key: 'session_id', id: 'ok', effort: 'xhigh' }
+    )
+    for (const effort of ['--model', 'high; rm -rf /', 'HIGH', '', 3]) {
+      expect(normalizeAgentProviderSession({ key: 'session_id', id: 'ok', effort })).toEqual({
+        key: 'session_id',
+        id: 'ok'
+      })
+    }
+  })
 })
 
 describe('OMP recorded resume locators', () => {
diff --git a/src/shared/agent-session-resume.ts b/src/shared/agent-session-resume.ts
index f6a5a71158d..48c486030bc 100644
--- a/src/shared/agent-session-resume.ts
+++ b/src/shared/agent-session-resume.ts
@@ -1,3 +1,4 @@
+import { readAgentEffortLevel } from './agent-effort-level'
 import type { AgentHookSource } from './agent-hook-relay'
 import type { AgentStatusCacheIdentity, RefusedPaneResume } from './agent-status-ipc-payload'
 import type { AgentStatusState } from './agent-status-types'
@@ -44,6 +45,8 @@ export type AgentProviderSessionMetadata = {
   transcriptPath?: string
   /** Folder the agent ran in; resume runs there, not the pane's start folder (#16960). */
   cwd?: string
+  /** Claude's live effort level; resume replays it because Claude restores only its saved per-model default. */
+  effort?: string
 }
 
 export type SleepingAgentLaunchConfig = {
@@ -181,22 +184,16 @@ export function normalizeAgentProviderSession(raw: unknown): AgentProviderSessio
   // Persisted/relay paths cross trust boundaries too; reject controls as for hook paths.
   const transcriptPath = readPathFromKeys(record, ['transcriptPath'])
   const cwd = readPathFromKeys(record, ['cwd'])
+  const effort = readAgentEffortLevel(record.effort)
   return {
     key,
     id,
     ...(transcriptPath ? { transcriptPath } : {}),
-    ...(cwd ? { cwd } : {})
+    ...(cwd ? { cwd } : {}),
+    ...(effort ? { effort } : {})
   }
 }
 
-/** Older hosts' strict ensureAgentSession schema rejects the newer `cwd` field. */
-export function agentProviderSessionForEnsure(
-  providerSession: AgentProviderSessionMetadata
-): AgentProviderSessionMetadata {
-  const { cwd: _cwd, ...identity } = providerSession
-  return identity
-}
-
 /** Compare the provider-owned values that identify the CLI resume target.
  *  Pi-family transcript resumes use file identity; other agents use provider ids. */
 export function agentProviderSessionsEqual(
diff --git a/src/shared/rpc-contract/agent-session-params.ts b/src/shared/rpc-contract/agent-session-params.ts
index 15a98d809e6..dee2e92db1d 100644
--- a/src/shared/rpc-contract/agent-session-params.ts
+++ b/src/shared/rpc-contract/agent-session-params.ts
@@ -5,6 +5,7 @@ import {
   getAgentResumeArgv,
   hasUnsafeProviderSessionIdChars
 } from '../agent-session-resume'
+import { AGENT_EFFORT_LEVEL } from '../agent-effort-level'
 import { parseAgentSessionOperationTimestamp } from '../agent-session-host-authority'
 import type {
   RuntimeCreateAgentSessionRequest,
@@ -110,7 +111,8 @@ export const ProviderSession = z
           Buffer.byteLength(value, 'utf8') <= MAX_TRANSCRIPT_PATH_BYTES,
         'Invalid transcript path'
       )
-      .optional()
+      .optional(),
+    effort: z.string().regex(AGENT_EFFORT_LEVEL, 'Invalid effort level').optional()
   })
   .strict()
 
diff --git a/src/shared/workspace-session-schema.sleeping-agent.test.ts b/src/shared/workspace-session-schema.sleeping-agent.test.ts
index df98b0e6461..3b2d314324e 100644
--- a/src/shared/workspace-session-schema.sleeping-agent.test.ts
+++ b/src/shared/workspace-session-schema.sleeping-agent.test.ts
@@ -148,6 +148,35 @@ describe('parseWorkspaceSession sleeping agents', () => {
     }
   })
 
+  it("preserves a Claude session's effort level through hydration", () => {
+    const providerSession = { key: 'session_id', id: 'claude-session', effort: 'max' }
+    const result = parseWorkspaceSession({
+      activeRepoId: null,
+      activeWorktreeId: null,
+      activeTabId: null,
+      tabsByWorktree: {},
+      terminalLayoutsByTabId: {},
+      sleepingAgentSessionsByPaneKey: {
+        'tab1:pane-1': {
+          paneKey: 'tab1:pane-1',
+          tabId: 'tab1',
+          worktreeId: 'wt',
+          agent: 'claude',
+          providerSession,
+          prompt: '',
+          state: 'done',
+          capturedAt: 10,
+          updatedAt: 10,
+          origin: 'live'
+        }
+      }
+    })
+
+    expect(
+      result.ok && result.value.sleepingAgentSessionsByPaneKey?.['tab1:pane-1']?.providerSession
+    ).toEqual(providerSession)
+  })
+
   it('preserves the AI Vault OMP resume file through hydration', () => {
     const result = parseWorkspaceSession({
       activeRepoId: null,
diff --git a/src/shared/workspace-session-sleeping-agents.ts b/src/shared/workspace-session-sleeping-agents.ts
index a6bfc11a8d0..17c9ddc97ad 100644
--- a/src/shared/workspace-session-sleeping-agents.ts
+++ b/src/shared/workspace-session-sleeping-agents.ts
@@ -4,6 +4,7 @@ import {
   normalizeAgentProviderSession,
   RESUMABLE_TUI_AGENTS
 } from './agent-session-resume'
+import { AGENT_EFFORT_LEVEL } from './agent-effort-level'
 import { isValidTerminalTabId } from './terminal-tab-id'
 import { normalizeMainAgentStatusField } from './agent-status-types'
 import { salvagingRecord } from './zod-salvage'
@@ -20,7 +21,8 @@ const agentProviderSessionSchema = z.preprocess(
     id: z.string().min(1).max(512),
     // Pi resume requires its persisted authoritative transcript path.
     transcriptPath: z.string().min(1).optional(),
-    cwd: z.string().min(1).optional()
+    cwd: z.string().min(1).optional(),
+    effort: z.string().regex(AGENT_EFFORT_LEVEL).optional()
   })
 )