diff --git a/src/main/daemon/daemon-pending-output-protocol.ts b/src/main/daemon/daemon-pending-output-protocol.ts
new file mode 100644
index 00000000000..0e6478e2a31
--- /dev/null
+++ b/src/main/daemon/daemon-pending-output-protocol.ts
@@ -0,0 +1,44 @@
+import type { TerminalSnapshot } from './terminal-snapshot'
+
+// Why: the 5s checkpoint used to re-serialize the full emulator buffer per
+// tick, stalling the daemon's PTY pump for O(buffer). Incremental checkpoints
+// take only the raw records accumulated since the last take; the emulator is
+// serialized only when a full snapshot is explicitly requested.
+export type PendingOutputRecord =
+  | { kind: 'output'; data: string }
+  | { kind: 'resize'; cols: number; rows: number }
+  | { kind: 'clear' }
+
+export type TakePendingOutputRequest = {
+  id: string
+  type: 'takePendingOutput'
+  payload: {
+    sessionId: string
+    /** When true, the daemon serializes a full snapshot in the SAME
+     *  synchronous turn as the take. This atomicity is load-bearing: a
+     *  snapshot taken in a separate request could include bytes that a later
+     *  take would replay again, duplicating content on cold restore. */
+    includeSnapshot?: boolean
+    /** True only for final checkpoints taken immediately before PTY teardown.
+     *  This lets the daemon release pending parser-state bytes that should be
+     *  preserved before the backing PTY is destroyed, without disturbing live
+     *  full checkpoints or warm-reconnect checkpoints. */
+    teardownSnapshot?: boolean
+  }
+}
+
+export type TakePendingOutputResult = {
+  records: PendingOutputRecord[]
+  /** Drained pending queue. Absent on older daemons. includeSnapshot still
+   *  keeps `records` as held-only so mixed-version adapters do not double-replay. */
+  drainedRecords?: PendingOutputRecord[]
+  /** Non-decreasing per-session batch sequence. The history log stores it so the
+   *  cold-restore reader can detect a lost batch (gap) and discard the log
+   *  instead of replaying a stream with missing bytes. Snapshot, record, and
+   *  overflow takes advance it; empty incremental takes repeat the prior value. */
+  seq: number
+  /** True when the session's pending buffer exceeded its cap and records were
+   *  dropped. The caller must fall back to a full snapshot checkpoint. */
+  overflowed: boolean
+  snapshot: TerminalSnapshot | null
+}
diff --git a/src/main/daemon/daemon-pty-session-inventory.ts b/src/main/daemon/daemon-pty-session-inventory.ts
index 42d728bc994..d6203b69524 100644
--- a/src/main/daemon/daemon-pty-session-inventory.ts
+++ b/src/main/daemon/daemon-pty-session-inventory.ts
@@ -14,6 +14,12 @@ import { parsePtySessionId } from './pty-session-id'
 import type { ListSessionsResult, SessionInfo } from './types'
 import { PtyProcessListAdmission } from '../providers/pty-process-list-admission'
 import type { PtyProcessInfo } from '../providers/types'
+import type { ForegroundProcessEvidence } from '../../shared/foreground-process-evidence'
+import {
+  readWslGuestProcessInventory,
+  resolveWslGuestForegroundProcess,
+  type WslGuestProcessInventoryRead
+} from '../providers/wsl-guest-process-inventory'
 
 export abstract class DaemonPtySessionInventory extends DaemonPtyProcessInspection {
   async listProcesses(opts?: { deadlineMs?: number }): Promise<PtyProcessInfo[]> {
@@ -45,12 +51,53 @@ export abstract class DaemonPtySessionInventory extends DaemonPtyProcessInspecti
       const admission = new PtyProcessListAdmission()
       const processes: PtyProcessInfo[] = []
       const aliveSessionIds = new Set<string>()
+      const evidenceEpoch = Date.now()
+      const wslByDistro = new Map<string, WslGuestProcessInventoryRead>()
+      if (process.platform === 'win32') {
+        const distros = new Set(
+          result.sessions
+            .filter((session) => session.isAlive && session.wslDistro)
+            .map((session) => session.wslDistro as string)
+        )
+        await Promise.all(
+          [...distros].map(async (distro) => {
+            wslByDistro.set(distro, await readWslGuestProcessInventory(distro))
+          })
+        )
+      }
       for (const session of result.sessions) {
         if (!session.isAlive) {
           continue
         }
         aliveSessionIds.add(session.sessionId)
         const { worktreeId } = parsePtySessionId(session.sessionId)
+        const inventory = session.wslDistro ? wslByDistro.get(session.wslDistro) : undefined
+        const resolution =
+          session.wslDistro && session.wslShellAnchor && inventory?.status === 'ok'
+            ? resolveWslGuestForegroundProcess(inventory.inventory, session.wslShellAnchor)
+            : null
+        const foregroundProcessEvidence: ForegroundProcessEvidence | undefined = session.wslDistro
+          ? resolution?.status === 'live'
+            ? {
+                verdict: 'live',
+                processName: resolution.processName,
+                authorityGeneration: session.incarnationId ?? 'daemon-wsl',
+                observationEpoch: evidenceEpoch,
+                capturedAgeMs: 0
+              }
+            : {
+                verdict: 'unverifiable',
+                reason:
+                  resolution?.status === 'unverifiable'
+                    ? resolution.reason
+                    : inventory?.status === 'unverifiable'
+                      ? inventory.reason
+                      : 'anchor_missing',
+                authorityGeneration: session.incarnationId ?? 'daemon-wsl',
+                observationEpoch: evidenceEpoch,
+                capturedAgeMs: 0
+              }
+          : undefined
         processes.push(
           admission.admit({
             id: session.sessionId,
@@ -58,10 +105,14 @@ export abstract class DaemonPtySessionInventory extends DaemonPtyProcessInspecti
             ...(session.pid ? { rootProcessId: session.pid } : {}),
             // Why: OSC 7 may not arrive before cleanup; spawn cwd is authoritative until the daemon reports a live cwd.
             cwd: session.cwd ?? this.initialCwds.get(session.sessionId) ?? '',
-            title: 'shell',
+            title:
+              resolution?.status === 'live' && resolution.processName
+                ? resolution.processName
+                : 'shell',
             ...(worktreeId ? { worktreeId } : {}),
             ...(session.terminalHandle ? { terminalHandle: session.terminalHandle } : {}),
             ...(session.wslDistro !== undefined ? { wslDistro: session.wslDistro } : {}),
+            ...(foregroundProcessEvidence ? { foregroundProcessEvidence } : {}),
             ...this.validatedAgentSessionOwners(session.agentSessionOwners)
           })
         )
diff --git a/src/main/daemon/session-checkpoint-access.ts b/src/main/daemon/session-checkpoint-access.ts
new file mode 100644
index 00000000000..722a8a4152b
--- /dev/null
+++ b/src/main/daemon/session-checkpoint-access.ts
@@ -0,0 +1,53 @@
+import type { PtyStartupIngress } from '../../shared/pty-startup-ingress'
+import type { SessionOutputPlane } from './session-output-plane'
+import type { SessionShellReadyBarrier } from './session-shell-ready-barrier'
+import type { TerminalShellRecoveryBarrier } from './terminal-shell-recovery-barrier'
+import type { TakePendingOutputResult, TerminalSnapshot } from './types'
+
+type SessionCheckpointAccessDeps = {
+  output: SessionOutputPlane
+  shellReady: SessionShellReadyBarrier
+  startupIngress: PtyStartupIngress
+  recoveryBarrier: TerminalShellRecoveryBarrier
+  isDisposed: () => boolean
+}
+
+export class SessionCheckpointAccess {
+  constructor(private readonly deps: SessionCheckpointAccessDeps) {}
+
+  getSnapshot(opts: { scrollbackRows?: number } = {}): TerminalSnapshot | null {
+    this.deps.startupIngress.snapshotBarrier()
+    return this.deps.output.getSnapshot(opts)
+  }
+
+  getPartialEscapeTailAnsi(): string {
+    return this.deps.output.getPartialEscapeTailAnsi()
+  }
+
+  getAppliedSize(): { cols: number; rows: number } | null {
+    return this.deps.output.getAppliedSize()
+  }
+
+  takePendingOutput(
+    includeSnapshot: boolean,
+    opts: { teardownSnapshot?: boolean } = {}
+  ): TakePendingOutputResult | null {
+    if (this.deps.isDisposed()) {
+      return null
+    }
+    const releasedHeldBytes =
+      includeSnapshot && opts.teardownSnapshot === true ? this.prepareForFinalSnapshot() : ''
+    return this.deps.output.takePendingOutput(includeSnapshot, releasedHeldBytes, () =>
+      this.getSnapshot()
+    )
+  }
+
+  prepareForFinalSnapshot(): string {
+    const held = this.deps.shellReady.releaseHeldBytes()
+    this.deps.startupIngress.snapshotBarrier()
+    // Why last: snapshotBarrier can emit held spans into the barrier, and a
+    // teardown checkpoint mid-episode must not lose the barrier's queued bytes.
+    this.deps.recoveryBarrier.flushPending()
+    return held
+  }
+}
diff --git a/src/main/daemon/session-wsl-shell-anchor-tracker.ts b/src/main/daemon/session-wsl-shell-anchor-tracker.ts
new file mode 100644
index 00000000000..fe24a8413e5
--- /dev/null
+++ b/src/main/daemon/session-wsl-shell-anchor-tracker.ts
@@ -0,0 +1,36 @@
+import {
+  createShellStartupIdentityScanState,
+  scanForShellStartupIdentity,
+  type ShellStartupIdentityScanState
+} from '../shell-startup-identity-scanner'
+import type { WslShellProcessAnchor } from '../../shared/wsl-shell-process-anchor'
+
+export class SessionWslShellAnchorTracker {
+  private scanState: ShellStartupIdentityScanState | null
+  private _anchor: WslShellProcessAnchor | null = null
+
+  constructor(private readonly distro: string | null) {
+    this.scanState = distro ? createShellStartupIdentityScanState() : null
+  }
+
+  get anchor(): WslShellProcessAnchor | null {
+    return this._anchor
+  }
+
+  scan(data: string): string {
+    if (!this.scanState) {
+      return data
+    }
+    const scanned = scanForShellStartupIdentity(this.scanState, data)
+    if (scanned.shellIdentity) {
+      if (scanned.shellIdentity.distro.toLowerCase() === this.distro?.toLowerCase()) {
+        this._anchor = scanned.shellIdentity
+      }
+      this.scanState = null
+    } else if (scanned.shellPid) {
+      // Legacy PID-only markers are consumed but never accepted as evidence.
+      this.scanState = null
+    }
+    return scanned.output
+  }
+}
diff --git a/src/main/daemon/session.test.ts b/src/main/daemon/session.test.ts
index 191b8ee7eaa..93993e38d78 100644
--- a/src/main/daemon/session.test.ts
+++ b/src/main/daemon/session.test.ts
@@ -166,6 +166,24 @@ describe('Session', () => {
   })
 
   describe('data flow', () => {
+    it('captures and strips the complete WSL shell anchor from live output', () => {
+      createSession({ wslDistro: 'Ubuntu' })
+      const marker =
+        '\x1b]777;orca-shell-start:v2:Ubuntu:01234567-89ab-cdef-0123-456789abcdef:123:456:/dev/pts/8\x07'
+      const received: string[] = []
+      session.attachClient({ onData: (data) => received.push(data), onExit: () => {} })
+      subprocess.simulateData(`before${marker}after`)
+      expect(received.join('')).toContain('beforeafter')
+      expect(received.join('')).not.toContain('orca-shell-start')
+      expect(session.getWslShellAnchor()).toEqual({
+        distro: 'Ubuntu',
+        bootId: '01234567-89ab-cdef-0123-456789abcdef',
+        shellPid: 123,
+        shellStartTime: 456,
+        tty: '/dev/pts/8'
+      })
+    })
+
     it('does not confirm shell ownership from historical replay bytes', () => {
       createSession({
         historySeedChunks: ['\x1b[?1049hOLD-TUI\x1b]133;D;137\x07old-shell-marker']
diff --git a/src/main/daemon/session.ts b/src/main/daemon/session.ts
index b0f1dfa538d..25935631e51 100644
--- a/src/main/daemon/session.ts
+++ b/src/main/daemon/session.ts
@@ -14,13 +14,11 @@ import type { SessionOptions } from './session-options'
 import type { TuiAgent } from '../../shared/tui-agent'
 import { randomUUID } from 'node:crypto'
 import { PtyStartupIngress } from '../../shared/pty-startup-ingress'
+import { SessionCheckpointAccess } from './session-checkpoint-access'
+import { SessionWslShellAnchorTracker } from './session-wsl-shell-anchor-tracker'
 
-import type {
-  SessionState,
-  ShellReadyState,
-  TakePendingOutputResult,
-  TerminalSnapshot
-} from './types'
+import type { SessionState, ShellReadyState, TakePendingOutputResult } from './types'
+import type { TerminalSnapshot } from './terminal-snapshot'
 import type { TerminalExitCause } from '../../shared/terminal-exit-cause'
 
 export class Session {
@@ -40,6 +38,8 @@ export class Session {
   private readonly termination: SessionTerminationController
   private readonly startupIngress: PtyStartupIngress
   private readonly recoveryBarrier: TerminalShellRecoveryBarrier
+  private readonly checkpoint: SessionCheckpointAccess
+  private readonly wslShellAnchorTracker: SessionWslShellAnchorTracker
 
   constructor(opts: SessionOptions) {
     this.sessionId = opts.sessionId
@@ -86,9 +86,18 @@ export class Session {
       write: (data) => this.subprocess.write(data),
       onEmission: (emission) => this.recoveryBarrier.accept(emission)
     })
+    this.checkpoint = new SessionCheckpointAccess({
+      output: this.output,
+      shellReady: this.shellReady,
+      startupIngress: this.startupIngress,
+      recoveryBarrier: this.recoveryBarrier,
+      isDisposed: () => this._disposed
+    })
+    this.wslShellAnchorTracker = new SessionWslShellAnchorTracker(this.wslDistro)
     this.shellReady.startPromptReadinessProbe()
     this.subprocess.onData((data) => {
       if (!this._disposed) {
+        data = this.wslShellAnchorTracker.scan(data)
         this.shellReady.ingestSubprocessData(data)
       }
     })
@@ -134,6 +143,10 @@ export class Session {
     return this.subprocess.pid
   }
 
+  getWslShellAnchor() {
+    return this.wslShellAnchorTracker.anchor
+  }
+
   /** Terminate this session's pty job object. `unavailable` is not proof of death. */
   terminateOwnedTree(): JobTerminationOutcome {
     return this.subprocess.terminateOwnedTree()
@@ -222,30 +235,22 @@ export class Session {
   }
 
   getSnapshot(opts: { scrollbackRows?: number } = {}): TerminalSnapshot | null {
-    this.startupIngress.snapshotBarrier()
-    return this.output.getSnapshot(opts)
+    return this.checkpoint.getSnapshot(opts)
   }
 
   getPartialEscapeTailAnsi(): string {
-    return this.output.getPartialEscapeTailAnsi()
+    return this.checkpoint.getPartialEscapeTailAnsi()
   }
 
   getAppliedSize(): { cols: number; rows: number } | null {
-    return this.output.getAppliedSize()
+    return this.checkpoint.getAppliedSize()
   }
 
   takePendingOutput(
     includeSnapshot: boolean,
     opts: { teardownSnapshot?: boolean } = {}
   ): TakePendingOutputResult | null {
-    if (this._disposed) {
-      return null
-    }
-    const releasedHeldBytes =
-      includeSnapshot && opts.teardownSnapshot === true ? this.prepareForFinalSnapshot() : ''
-    return this.output.takePendingOutput(includeSnapshot, releasedHeldBytes, () =>
-      this.getSnapshot()
-    )
+    return this.checkpoint.takePendingOutput(includeSnapshot, opts)
   }
 
   getCwd(): string | null {
@@ -275,12 +280,7 @@ export class Session {
   }
 
   prepareForFinalSnapshot(): string {
-    const held = this.shellReady.releaseHeldBytes()
-    this.startupIngress.snapshotBarrier()
-    // Why last: snapshotBarrier can emit held spans into the barrier, and a
-    // teardown checkpoint mid-episode must not lose the barrier's queued bytes.
-    this.recoveryBarrier.flushPending()
-    return held
+    return this.checkpoint.prepareForFinalSnapshot()
   }
 
   dispose(): void {
diff --git a/src/main/daemon/shell-ready-bash-wrapper.test.ts b/src/main/daemon/shell-ready-bash-wrapper.test.ts
index 0fbdce87029..25644eeba70 100644
--- a/src/main/daemon/shell-ready-bash-wrapper.test.ts
+++ b/src/main/daemon/shell-ready-bash-wrapper.test.ts
@@ -70,6 +70,9 @@ describePosix('daemon shell-ready bash wrapper', () => {
 
     expect(bashRc).toContain('printf "\\033]133;D;%s\\007"')
     expect(bashRc).toContain('printf "\\033]777;orca-shell-start:%s\\007" "$$"')
+    expect(bashRc).toContain(
+      'printf "\\033]777;orca-shell-start:v2:%s:%s:%s:%s:%s\\007" "$_orca_distro" "$_orca_boot" "$$" "$_orca_start" "$_orca_tty"'
+    )
     expect(bashRc).toContain('printf "\\033]133;C\\007"')
     expect(bashRc).toContain('__orca_prepend_prompt_command "__orca_osc133_precmd"')
     expect(bashRc).toContain('__orca_append_prompt_command "__orca_osc133_epilogue"')
diff --git a/src/main/daemon/shell-ready.test.ts b/src/main/daemon/shell-ready.test.ts
index 6772a52d46e..27e8f0beaf5 100644
--- a/src/main/daemon/shell-ready.test.ts
+++ b/src/main/daemon/shell-ready.test.ts
@@ -436,6 +436,9 @@ describePosix('daemon shell-ready launch config', () => {
     expect(zshenv).toContain('builtin export ZDOTDIR="$ORCA_ORIG_ZDOTDIR"')
     expect(zshenv).toContain('builtin unset ORCA_ORIG_ZDOTDIR ORCA_ZSHENV_SOURCE_DIR')
     expect(zshenv).toContain('printf "\\033]777;orca-shell-start:%s\\007" "$$"')
+    expect(zshenv).toContain(
+      'printf "\\033]777;orca-shell-start:v2:%s:%s:%s:%s:%s\\007" "$_orca_distro" "$_orca_boot" "$$" "$_orca_start" "$_orca_tty"'
+    )
     expect(zshenv.indexOf('builtin export ZDOTDIR=')).toBeLessThan(
       zshenv.indexOf('builtin source -- "$_orca_user_zshenv"')
     )
diff --git a/src/main/daemon/terminal-host-session-listing.ts b/src/main/daemon/terminal-host-session-listing.ts
index 3ae2d5e845e..a3cf59d669a 100644
--- a/src/main/daemon/terminal-host-session-listing.ts
+++ b/src/main/daemon/terminal-host-session-listing.ts
@@ -25,7 +25,8 @@ export function listLiveTerminalHostSessions(
       cols: size?.cols ?? 0,
       rows: size?.rows ?? 0,
       createdAt: 0,
-      agentSessionOwners: agentSessionOwners.listForPty(session.sessionId)
+      agentSessionOwners: agentSessionOwners.listForPty(session.sessionId),
+      ...(session.getWslShellAnchor() ? { wslShellAnchor: session.getWslShellAnchor()! } : {})
     })
   }
   return result
diff --git a/src/main/daemon/types.ts b/src/main/daemon/types.ts
index bffdc1d2ed5..8718a801f78 100644
--- a/src/main/daemon/types.ts
+++ b/src/main/daemon/types.ts
@@ -21,7 +21,14 @@ import type {
   AgentSessionOwnerBinding,
   AgentSessionSurfaceBinding
 } from '../../shared/agent-session-host-authority'
+import type { WslShellProcessAnchor } from '../../shared/wsl-shell-process-anchor'
 import type * as HistorySeedProtocol from './terminal-history-seed-transfer-protocol'
+import type { TakePendingOutputRequest } from './daemon-pending-output-protocol'
+export type {
+  PendingOutputRecord,
+  TakePendingOutputRequest,
+  TakePendingOutputResult
+} from './daemon-pending-output-protocol'
 export type { TerminalModes } from './terminal-modes'
 import type { TerminalSnapshot } from './terminal-snapshot'
 export type { TerminalSnapshot } from './terminal-snapshot'
@@ -256,51 +263,6 @@ export type GetSizeRequest = {
   }
 }
 
-// ─── Incremental checkpoint records (v13+) ──────────────────────────
-// Why: the 5s checkpoint used to re-serialize the full emulator buffer per
-// tick, stalling the daemon's PTY pump for O(buffer). Incremental checkpoints
-// take only the raw records accumulated since the last take; the emulator is
-// serialized only when a full snapshot is explicitly requested (clean
-// shutdown, pending-buffer overflow, or the on-disk log reaching its cap).
-export type PendingOutputRecord =
-  | { kind: 'output'; data: string }
-  | { kind: 'resize'; cols: number; rows: number }
-  | { kind: 'clear' }
-
-export type TakePendingOutputRequest = {
-  id: string
-  type: 'takePendingOutput'
-  payload: {
-    sessionId: string
-    /** When true, the daemon serializes a full snapshot in the SAME
-     *  synchronous turn as the take. This atomicity is load-bearing: a
-     *  snapshot taken in a separate request could include bytes that a later
-     *  take would replay again, duplicating content on cold restore. */
-    includeSnapshot?: boolean
-    /** True only for final checkpoints taken immediately before PTY teardown.
-     *  This lets the daemon release pending parser-state bytes that should be
-     *  preserved before the backing PTY is destroyed, without disturbing live
-     *  full checkpoints or warm-reconnect checkpoints. */
-    teardownSnapshot?: boolean
-  }
-}
-
-export type TakePendingOutputResult = {
-  records: PendingOutputRecord[]
-  /** Drained pending queue. Absent on older daemons. includeSnapshot still
-   *  keeps `records` as held-only so mixed-version adapters do not double-replay. */
-  drainedRecords?: PendingOutputRecord[]
-  /** Non-decreasing per-session batch sequence. The history log stores it so the
-   *  cold-restore reader can detect a lost batch (gap) and discard the log
-   *  instead of replaying a stream with missing bytes. Snapshot, record, and
-   *  overflow takes advance it; empty incremental takes repeat the prior value. */
-  seq: number
-  /** True when the session's pending buffer exceeded its cap and records were
-   *  dropped. The caller must fall back to a full snapshot checkpoint. */
-  overflowed: boolean
-  snapshot: TerminalSnapshot | null
-}
-
 export type DaemonRequest =
   | CreateOrAttachRequest
   | HistorySeedProtocol.TerminalHistorySeedTransferRequest
@@ -379,6 +341,8 @@ export type SessionInfo = {
   rows: number
   createdAt: number
   agentSessionOwners?: AgentSessionOwnerBinding[]
+  /** Optional identity emitted by an Orca-owned WSL shell wrapper. */
+  wslShellAnchor?: WslShellProcessAnchor
 }
 
 // Why: SessionInfo + source protocol version, so the Manage Sessions UI can
diff --git a/src/main/ipc/pty/ipc/inspect.ts b/src/main/ipc/pty/ipc/inspect.ts
index 9f99d1e099c..6336c8cbefc 100644
--- a/src/main/ipc/pty/ipc/inspect.ts
+++ b/src/main/ipc/pty/ipc/inspect.ts
@@ -55,6 +55,9 @@ export function installPtyInspectIpcHandlers(deps: {
             id: session.id,
             cwd: session.cwd,
             title: session.title,
+            ...(session.foregroundProcessEvidence
+              ? { foregroundProcessEvidence: session.foregroundProcessEvidence }
+              : {}),
             // Why: the renderer's binding map is empty during restore, so ownership is the only
             // liveness evidence it has. Absence is authoritative only from a provider that
             // serializes claims — otherwise it is 'unknown', never 'absent' (#8459).
diff --git a/src/main/providers/local-pty-foreground-inspection.ts b/src/main/providers/local-pty-foreground-inspection.ts
index c42c06d9121..f8e272c36af 100644
--- a/src/main/providers/local-pty-foreground-inspection.ts
+++ b/src/main/providers/local-pty-foreground-inspection.ts
@@ -8,8 +8,14 @@ import {
   ptyAgentForegroundContextPaths,
   ptyLastRecognizedForeground,
   ptyProcesses,
-  ptyShellName
+  ptyShellName,
+  ptyWslDistroById,
+  ptyWslShellAnchors
 } from './local-pty-provider-state'
+import {
+  readWslGuestProcessInventory,
+  resolveWslGuestForegroundProcess
+} from './wsl-guest-process-inventory'
 import { resolveStableForegroundProcess } from './stable-foreground-process'
 import {
   canRevalidateCachedAgentWithoutScan,
@@ -45,6 +51,34 @@ export async function getLocalPtyForegroundProcess(id: string): Promise<string |
     proc.process || null,
     ptyShellName.get(id)
   )
+  const wslDistro = ptyWslDistroById.get(id)
+  if (process.platform === 'win32' && wslDistro) {
+    const anchor = ptyWslShellAnchors.get(id)
+    if (!anchor) {
+      return null
+    }
+    const read = await readWslGuestProcessInventory(wslDistro)
+    if (ptyProcesses.get(id) !== proc || read.status !== 'ok') {
+      return null
+    }
+    const resolution = resolveWslGuestForegroundProcess(read.inventory, anchor)
+    if (ptyProcesses.get(id) !== proc) {
+      return null
+    }
+    if (resolution.status === 'unverifiable') {
+      return null
+    }
+    ptyWslShellAnchors.set(id, resolution.anchor)
+    if (resolution.processName) {
+      ptyLastRecognizedForeground.set(id, {
+        name: resolution.processName,
+        pid: resolution.anchor.shellPid,
+        at: Date.now()
+      })
+      return resolution.processName
+    }
+    return null
+  }
   const cachedEntry = ptyLastRecognizedForeground.get(id)
   const cachedAgent = cachedEntry?.name ?? null
   let paneMembershipUnavailable = false
@@ -156,6 +190,23 @@ export async function confirmLocalPtyForegroundProcess(id: string): Promise<stri
   if (!proc) {
     return null
   }
+  const wslDistro = ptyWslDistroById.get(id)
+  if (process.platform === 'win32' && wslDistro) {
+    const anchor = ptyWslShellAnchors.get(id)
+    if (!anchor) {
+      return null
+    }
+    const read = await readWslGuestProcessInventory(wslDistro)
+    if (ptyProcesses.get(id) !== proc || read.status !== 'ok') {
+      return null
+    }
+    const resolution = resolveWslGuestForegroundProcess(read.inventory, anchor)
+    if (ptyProcesses.get(id) !== proc || resolution.status !== 'live') {
+      return null
+    }
+    ptyWslShellAnchors.set(id, resolution.anchor)
+    return resolution.processName
+  }
   try {
     const resolution = await resolveAgentForegroundProcessWithAvailability(
       proc.pid,
diff --git a/src/main/providers/local-pty-provider-state.ts b/src/main/providers/local-pty-provider-state.ts
index 5e87502b1f6..a63c5e993f7 100644
--- a/src/main/providers/local-pty-provider-state.ts
+++ b/src/main/providers/local-pty-provider-state.ts
@@ -3,6 +3,7 @@ import type { PhysicalExitTracker } from '../../shared/physical-exit-tracker'
 import type { PtyStartupIngress } from '../../shared/pty-startup-ingress'
 import type { TerminalExitCause } from '../../shared/terminal-exit-cause'
 import { normalizeLocalCallerSessionId } from './local-pty-launch-helpers'
+import type { WslShellProcessAnchor } from '../../shared/wsl-shell-process-anchor'
 
 export type PtyShutdownOperation = {
   promise: Promise<void>
@@ -52,6 +53,9 @@ export const ptyWorktreeId = new Map<string, string>()
 export const ptyInitialCwd = new Map<string, string>()
 // Why: reattach carries current settings, not the live process's launch context; keep the first creator's WSL/native identity.
 export const ptyWslDistroById = new Map<string, string | null>()
+/** Guest shell identity observed from the WSL wrapper's OSC startup marker. */
+export type WslPtyShellAnchor = WslShellProcessAnchor
+export const ptyWslShellAnchors = new Map<string, WslPtyShellAnchor>()
 // Why: node-pty callbacks dispose before env teardown, but onExit separately owns physical-exit proof during termination.
 export const ptyDisposables = new Map<string, { dispose: () => void }[]>()
 export const ptyExitDisposables = new Map<string, { dispose: () => void }>()
@@ -123,6 +127,7 @@ export function clearPtyState(id: string): void {
   ptyWorktreeId.delete(id)
   ptyInitialCwd.delete(id)
   ptyWslDistroById.delete(id)
+  ptyWslShellAnchors.delete(id)
   ptyLoadGeneration.delete(id)
   ptyTerminationMode.delete(id)
   ptyReportsChildExitStatus.delete(id)
diff --git a/src/main/providers/local-pty-session-activation.ts b/src/main/providers/local-pty-session-activation.ts
index a5991581f82..40d0d776f31 100644
--- a/src/main/providers/local-pty-session-activation.ts
+++ b/src/main/providers/local-pty-session-activation.ts
@@ -28,11 +28,17 @@ import {
   ptyTerminationMode,
   ptyWorktreeId,
   ptyWslDistroById,
+  ptyWslShellAnchors,
   startupIngressByPty
 } from './local-pty-provider-state'
 import { createLocalPtyShellReadinessSession } from './local-pty-shell-readiness-session'
 import { destroyPtyProcess, createPtyPhysicalExit } from './local-pty-termination'
 import { writeStartupCommandWhenShellReady } from './local-pty-shell-ready-startup-command'
+import {
+  createShellStartupIdentityScanState,
+  scanForShellStartupIdentity,
+  type ShellStartupIdentityScanState
+} from '../shell-startup-identity-scanner'
 import type { PtySpawnOptions, PtySpawnResult } from './types'
 
 export function activateLocalPtySession(args: {
@@ -105,6 +111,11 @@ export function activateLocalPtySession(args: {
     onEmission: emitIngressData
   })
   startupIngressByPty.set(id, startupIngress)
+  // A Windows host only sees wsl.exe. Keep the guest PID marker separate from
+  // the shell-ready scanner so WSL panes without a startup command are still
+  // anchored, and strip it before bytes reach xterm/the user shell.
+  let wslIdentityScanState: ShellStartupIdentityScanState | null =
+    process.platform === 'win32' && spawnedWslDistro ? createShellStartupIdentityScanState() : null
 
   // Shell-ready startup command support
   const readiness = createLocalPtyShellReadinessSession({
@@ -117,7 +128,23 @@ export function activateLocalPtySession(args: {
   })
   const disposables: { dispose: () => void }[] = []
   const onDataDisposable = proc.onData((rawData) => {
-    readiness.acceptData(rawData)
+    let data = rawData
+    if (wslIdentityScanState) {
+      const scanned = scanForShellStartupIdentity(wslIdentityScanState, data)
+      data = scanned.output
+      if (scanned.shellIdentity) {
+        // The marker carries boot/start/TTY fencing. A legacy PID-only marker
+        // is intentionally ignored and remains unverifiable.
+        if (scanned.shellIdentity.distro.toLowerCase() === spawnedWslDistro!.toLowerCase()) {
+          ptyWslShellAnchors.set(id, scanned.shellIdentity)
+        }
+        wslIdentityScanState = null
+      } else if (scanned.shellPid) {
+        // Consume legacy PID-only markers without accepting them as evidence.
+        wslIdentityScanState = null
+      }
+    }
+    readiness.acceptData(data)
   })
   if (onDataDisposable) {
     disposables.push(onDataDisposable)
diff --git a/src/main/providers/local-pty-session-operations.ts b/src/main/providers/local-pty-session-operations.ts
index 0d02b45e5df..699c49f22b4 100644
--- a/src/main/providers/local-pty-session-operations.ts
+++ b/src/main/providers/local-pty-session-operations.ts
@@ -16,12 +16,19 @@ import {
   ptyTerminalHandle,
   ptyWorktreeId,
   ptyWslDistroById,
+  ptyWslShellAnchors,
   startupIngressByPty,
   type DataCallback,
   type ExitCallback
 } from './local-pty-provider-state'
 import type { LocalPtyProviderOptions } from './local-pty-provider-types'
 import type { PtyProcessInfo } from './types'
+import {
+  readWslGuestProcessInventory,
+  resolveWslGuestForegroundProcess,
+  type WslGuestProcessInventoryRead
+} from './wsl-guest-process-inventory'
+import type { ForegroundProcessEvidence } from '../../shared/foreground-process-evidence'
 
 export function writeLocalPty(id: string, data: string): boolean {
   // Cooked PTYs echo private DSR/OSC replies; CPR/DA stay immediate unless one of
@@ -116,15 +123,72 @@ export function closeLocalPtyStartupQueryAuthority(id: string): number {
 }
 
 export async function listLocalPtyProcesses(): Promise<PtyProcessInfo[]> {
-  return Array.from(ptyProcesses.entries()).map(([id, proc]) => ({
-    id,
-    ...(ptyIncarnations.get(id) ? { incarnationId: ptyIncarnations.get(id) } : {}),
-    cwd: ptyInitialCwd.get(id) ?? '',
-    title: proc.process || ptyShellName.get(id) || 'shell',
-    ...(ptyWorktreeId.get(id) ? { worktreeId: ptyWorktreeId.get(id) } : {}),
-    ...(ptyTerminalHandle.get(id) ? { terminalHandle: ptyTerminalHandle.get(id) } : {}),
-    ...(ptyWslDistroById.has(id) ? { wslDistro: ptyWslDistroById.get(id) ?? null } : {})
-  }))
+  const entries = Array.from(ptyProcesses.entries())
+  const evidenceEpoch = Date.now()
+  const wslByDistro = new Map<string, string[]>()
+  for (const [id] of entries) {
+    const distro = ptyWslDistroById.get(id)
+    if (distro) {
+      const ids = wslByDistro.get(distro) ?? []
+      ids.push(id)
+      wslByDistro.set(distro, ids)
+    }
+  }
+  const inventories = new Map<string, WslGuestProcessInventoryRead>()
+  await Promise.all(
+    [...wslByDistro.keys()].map(async (distro) => {
+      inventories.set(distro, await readWslGuestProcessInventory(distro))
+    })
+  )
+
+  return entries.map(([id, proc]) => {
+    const distro = ptyWslDistroById.get(id)
+    let title = proc.process || ptyShellName.get(id) || 'shell'
+    let foregroundProcessEvidence: ForegroundProcessEvidence | undefined
+    if (distro) {
+      const read = inventories.get(distro)
+      const anchor = ptyWslShellAnchors.get(id)
+      const resolution =
+        read?.status === 'ok' && anchor
+          ? resolveWslGuestForegroundProcess(read.inventory, anchor)
+          : {
+              status: 'unverifiable' as const,
+              reason: read?.status === 'unverifiable' ? read.reason : 'anchor_missing'
+            }
+      foregroundProcessEvidence =
+        resolution.status === 'live'
+          ? {
+              verdict: 'live',
+              processName: resolution.processName,
+              authorityGeneration: ptyIncarnations.get(id) ?? 'local-wsl',
+              observationEpoch: evidenceEpoch,
+              capturedAgeMs: 0
+            }
+          : {
+              verdict: 'unverifiable',
+              reason: resolution.reason,
+              authorityGeneration: ptyIncarnations.get(id) ?? 'local-wsl',
+              observationEpoch: evidenceEpoch,
+              capturedAgeMs: 0
+            }
+      if (resolution.status === 'live') {
+        ptyWslShellAnchors.set(id, resolution.anchor)
+        if (resolution.processName) {
+          title = resolution.processName
+        }
+      }
+    }
+    return {
+      id,
+      ...(ptyIncarnations.get(id) ? { incarnationId: ptyIncarnations.get(id) } : {}),
+      cwd: ptyInitialCwd.get(id) ?? '',
+      title,
+      ...(ptyWorktreeId.get(id) ? { worktreeId: ptyWorktreeId.get(id) } : {}),
+      ...(ptyTerminalHandle.get(id) ? { terminalHandle: ptyTerminalHandle.get(id) } : {}),
+      ...(ptyWslDistroById.has(id) ? { wslDistro: ptyWslDistroById.get(id) ?? null } : {}),
+      ...(foregroundProcessEvidence ? { foregroundProcessEvidence } : {})
+    }
+  })
 }
 
 export async function getDefaultLocalPtyShell(
diff --git a/src/main/providers/local-pty-shell-ready-wrapper-generation.test.ts b/src/main/providers/local-pty-shell-ready-wrapper-generation.test.ts
index af0fc4a5deb..2da020c785b 100644
--- a/src/main/providers/local-pty-shell-ready-wrapper-generation.test.ts
+++ b/src/main/providers/local-pty-shell-ready-wrapper-generation.test.ts
@@ -287,7 +287,7 @@ describePosix('local PTY shell-ready launch config', () => {
 
     const zshenv = readFileSync(join(getShellReadyWrapperRoot(), 'zsh', '.zshenv'), 'utf8')
     expect(zshenv).toContain('builtin export ZDOTDIR="$ORCA_ORIG_ZDOTDIR"')
-    expect(zshenv).toContain('printf "\\033]777;orca-shell-start:%s\\007" "$$"')
+    expect(zshenv).toContain('orca-shell-start:v2:')
     // The handback is what makes a nested Orca unable to inherit this dir, and
     // what stops /etc/zshrc deriving HISTFILE from it.
     expect(zshenv).toContain('builtin unset ORCA_ORIG_ZDOTDIR ORCA_ZSHENV_SOURCE_DIR')
diff --git a/src/main/providers/wsl-guest-foreground-process-resolution.ts b/src/main/providers/wsl-guest-foreground-process-resolution.ts
new file mode 100644
index 00000000000..e8959cdd618
--- /dev/null
+++ b/src/main/providers/wsl-guest-foreground-process-resolution.ts
@@ -0,0 +1,93 @@
+import { recognizeAgentProcessFromCommandLine } from '../../shared/agent-process-recognition'
+import type { WslShellProcessAnchor } from '../../shared/wsl-shell-process-anchor'
+import type {
+  WslGuestProcessInventory,
+  WslGuestProcessRow
+} from './wsl-guest-process-inventory-parser'
+
+export type WslGuestProcessAnchor = WslShellProcessAnchor
+
+export type WslGuestForegroundResolution =
+  | { status: 'live'; processName: string | null; anchor: WslGuestProcessAnchor }
+  | { status: 'unverifiable'; reason: string }
+
+function normalizeTty(tty: string): string {
+  return tty.startsWith('/dev/') ? tty : tty === '?' ? '' : `/dev/${tty}`
+}
+
+/** Correlate one shell anchor to its foreground group and strict agent recognizer. */
+export function resolveWslGuestForegroundProcess(
+  inventory: WslGuestProcessInventory,
+  anchor: WslGuestProcessAnchor
+): WslGuestForegroundResolution {
+  if (inventory.distro.toLowerCase() !== anchor.distro.toLowerCase()) {
+    return { status: 'unverifiable', reason: 'distro_mismatch' }
+  }
+  if (inventory.bootId !== anchor.bootId) {
+    return { status: 'unverifiable', reason: 'boot_id_mismatch' }
+  }
+  const shell = inventory.rows.find((row) => row.pid === anchor.shellPid)
+  if (!shell) {
+    return { status: 'unverifiable', reason: 'anchor_missing' }
+  }
+  const tty = normalizeTty(shell.tty)
+  if (!tty || (anchor.tty !== undefined && normalizeTty(anchor.tty) !== tty)) {
+    return { status: 'unverifiable', reason: 'tty_mismatch' }
+  }
+  if (shell.startTimeTicks !== anchor.shellStartTime) {
+    return { status: 'unverifiable', reason: 'pid_reused' }
+  }
+  if (shell.tpgid <= 0) {
+    return { status: 'unverifiable', reason: 'foreground_group_missing' }
+  }
+  const group = inventory.rows.filter(
+    (row) => row.pgid === shell.tpgid && normalizeTty(row.tty) === tty
+  )
+  if (group.length === 0) {
+    return { status: 'unverifiable', reason: 'foreground_group_missing' }
+  }
+  // Multiplexers move the real command to another PTY/session. Without a
+  // session-aware anchor, the outer shell cannot make a truthful claim.
+  const isMultiplexer = (command: string): boolean =>
+    /(?:^|\s)(?:tmux|screen)(?:\s|$)/.test(command)
+  if (group.some((row) => isMultiplexer(row.command))) {
+    return { status: 'unverifiable', reason: 'multiplexer_boundary' }
+  }
+  const byPid = new Map(inventory.rows.map((row) => [row.pid, row]))
+  const isShellDescendant = (row: WslGuestProcessRow): boolean => {
+    const seen = new Set<number>()
+    let current: WslGuestProcessRow | undefined = row
+    while (current && !seen.has(current.pid)) {
+      if (current.pid === shell.pid) {
+        return true
+      }
+      seen.add(current.pid)
+      current = byPid.get(current.ppid)
+    }
+    return false
+  }
+  if (
+    inventory.rows.some(
+      (row) =>
+        row.pid !== shell.pid &&
+        normalizeTty(row.tty) !== tty &&
+        isMultiplexer(row.command) &&
+        isShellDescendant(row)
+    )
+  ) {
+    return { status: 'unverifiable', reason: 'multiplexer_boundary' }
+  }
+  const recognized = group
+    .map((row) => recognizeAgentProcessFromCommandLine(row.command)?.processName ?? null)
+    .filter((name): name is string => name !== null)
+  if (new Set(recognized).size > 1) {
+    return { status: 'unverifiable', reason: 'ambiguous_foreground_group' }
+  }
+  const nextAnchor = {
+    ...anchor,
+    bootId: inventory.bootId,
+    shellStartTime: shell.startTimeTicks,
+    tty
+  }
+  return { status: 'live', processName: recognized[0] ?? null, anchor: nextAnchor }
+}
diff --git a/src/main/providers/wsl-guest-process-inventory-parser.ts b/src/main/providers/wsl-guest-process-inventory-parser.ts
new file mode 100644
index 00000000000..9b468057129
--- /dev/null
+++ b/src/main/providers/wsl-guest-process-inventory-parser.ts
@@ -0,0 +1,101 @@
+/** A process row read inside one WSL distro. */
+export type WslGuestProcessRow = {
+  pid: number
+  ppid: number
+  sid: number
+  pgid: number
+  tpgid: number
+  tty: string
+  stat: string
+  startTimeTicks: number
+  command: string
+}
+
+export type WslGuestProcessInventory = {
+  distro: string
+  bootId: string
+  rows: readonly WslGuestProcessRow[]
+}
+
+export function parseWslGuestProcessInventoryPayload(
+  payload: string,
+  distro: string
+): WslGuestProcessInventory {
+  let bootId: string | null = null
+  let expectedCount: number | null = null
+  let seenCount: number | null = null
+  const rows: WslGuestProcessRow[] = []
+  const pids = new Set<number>()
+  for (const rawLine of payload.split(/\r?\n/)) {
+    // Remove only the transport CR; trailing spaces belong to the command
+    // remainder and must not be normalized away.
+    const line = rawLine.endsWith('\r') ? rawLine.slice(0, -1) : rawLine
+    if (!line) {
+      continue
+    }
+    const boot = line.match(/^boot ([A-Fa-f0-9-]{8,128})$/)
+    if (boot) {
+      if (bootId !== null) {
+        throw new Error('duplicate_boot_id')
+      }
+      bootId = boot[1]!
+      continue
+    }
+    const count = line.match(/^count (\d+) (\d+)$/)
+    if (count) {
+      if (seenCount !== null) {
+        throw new Error('duplicate_count')
+      }
+      seenCount = Number(count[1])
+      expectedCount = Number(count[2])
+      continue
+    }
+    const row = line.match(/^row (\d+) (\d+) (\d+) (-?\d+) (-?\d+) (\S+) (\S+) (\d+)(?: (.*))?$/)
+    if (!row) {
+      throw new Error('malformed_row')
+    }
+    const values = [1, 2, 3, 4, 5, 8].map((index) => Number(row[index]))
+    const [pid, ppid, sid, pgid, tpgid, startTimeTicks] = values
+    if (
+      !Number.isSafeInteger(pid) ||
+      pid <= 0 ||
+      !Number.isSafeInteger(ppid) ||
+      ppid < 0 ||
+      !Number.isSafeInteger(sid) ||
+      sid < 0 ||
+      !Number.isSafeInteger(pgid) ||
+      pgid < 0 ||
+      !Number.isSafeInteger(tpgid) ||
+      (tpgid < 0 && tpgid !== -1) ||
+      !Number.isSafeInteger(startTimeTicks) ||
+      startTimeTicks < 0 ||
+      pids.has(pid)
+    ) {
+      throw new Error('invalid_row')
+    }
+    pids.add(pid)
+    rows.push({
+      pid,
+      ppid,
+      sid,
+      pgid,
+      tpgid,
+      tty: row[6]!,
+      stat: row[7]!,
+      startTimeTicks,
+      command: row[9] ?? ''
+    })
+  }
+  if (!bootId) {
+    throw new Error('boot_id_missing')
+  }
+  if (
+    seenCount === null ||
+    expectedCount === null ||
+    seenCount !== expectedCount ||
+    seenCount !== rows.length
+  ) {
+    throw new Error('row_count_mismatch')
+  }
+  return { distro, bootId, rows }
+}
diff --git a/src/main/providers/wsl-guest-process-inventory.test.ts b/src/main/providers/wsl-guest-process-inventory.test.ts
new file mode 100644
index 00000000000..a75fbd58758
--- /dev/null
+++ b/src/main/providers/wsl-guest-process-inventory.test.ts
@@ -0,0 +1,182 @@
+import { execFileSync } from 'node:child_process'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+const { runProcessMock } = vi.hoisted(() => ({ runProcessMock: vi.fn() }))
+
+vi.mock('../../shared/child-process/run-process', () => ({
+  runProcess: (...args: unknown[]) => runProcessMock(...args)
+}))
+import {
+  createWslGuestProcessInventoryReader,
+  parseWslGuestProcessInventoryPayload,
+  readWslGuestProcessInventory,
+  resetWslGuestProcessInventoryForTests,
+  resolveWslGuestForegroundProcess,
+  WSL_GUEST_INVENTORY_SCRIPT
+} from './wsl-guest-process-inventory'
+
+const bootId = '01234567-89ab-cdef-0123-456789abcdef'
+
+function payload(rows: string, count = rows ? rows.split('\n').length : 0): string {
+  return `boot ${bootId}\n${rows}${rows ? '\n' : ''}count ${count} ${count}\n`
+}
+
+describe('WSL guest process inventory', () => {
+  beforeEach(() => {
+    runProcessMock.mockReset()
+  })
+
+  it('keeps the guest inventory script valid for /bin/sh', () => {
+    expect(() => execFileSync('sh', ['-n'], { input: WSL_GUEST_INVENTORY_SCRIPT })).not.toThrow()
+  })
+
+  it('parses fixed fields and preserves whitespace in args', () => {
+    const inventory = parseWslGuestProcessInventoryPayload(
+      payload('row 100 90 90 100 100 pts/0 Sl+ 12345 /usr/bin/node --name "a b" --x'),
+      'Ubuntu'
+    )
+    expect(inventory.rows[0]).toMatchObject({
+      pid: 100,
+      ppid: 90,
+      sid: 90,
+      pgid: 100,
+      tpgid: 100,
+      tty: 'pts/0',
+      stat: 'Sl+',
+      startTimeTicks: 12345,
+      command: '/usr/bin/node --name "a b" --x'
+    })
+  })
+
+  it('keeps trailing spaces in the command remainder', () => {
+    const inventory = parseWslGuestProcessInventoryPayload(
+      payload('row 100 90 90 100 100 pts/0 Sl+ 12345 tool arg   '),
+      'Ubuntu'
+    )
+    expect(inventory.rows[0]?.command).toBe('tool arg   ')
+  })
+
+  it('rejects a partial capture instead of treating it as an empty inventory', () => {
+    expect(() =>
+      parseWslGuestProcessInventoryPayload(`boot ${bootId}\ncount 0 1\n`, 'Ubuntu')
+    ).toThrow('row_count_mismatch')
+  })
+
+  it('fences boot, start-time, tty, and foreground group before recognizing agents', () => {
+    const inventory = parseWslGuestProcessInventoryPayload(
+      payload(
+        [
+          'row 100 90 90 100 120 pts/0 Ss+ 12345 bash',
+          'row 120 100 100 120 120 pts/0 Sl+ 54321 codex --flag'
+        ].join('\n'),
+        2
+      ),
+      'Ubuntu'
+    )
+    const resolved = resolveWslGuestForegroundProcess(inventory, {
+      distro: 'Ubuntu',
+      bootId,
+      shellPid: 100,
+      shellStartTime: 12345,
+      tty: '/dev/pts/0'
+    })
+    expect(resolved).toMatchObject({ status: 'live', processName: 'codex' })
+    if (resolved.status === 'live') {
+      expect(resolved.anchor).toMatchObject({
+        bootId,
+        shellStartTime: 12345,
+        tty: '/dev/pts/0'
+      })
+    }
+    expect(
+      resolveWslGuestForegroundProcess(inventory, {
+        distro: 'Ubuntu',
+        bootId: 'different',
+        shellPid: 100,
+        shellStartTime: 12345,
+        tty: '/dev/pts/0'
+      })
+    ).toEqual({ status: 'unverifiable', reason: 'boot_id_mismatch' })
+    expect(
+      resolveWslGuestForegroundProcess(inventory, {
+        distro: 'Ubuntu',
+        bootId,
+        shellPid: 100,
+        shellStartTime: 999,
+        tty: '/dev/pts/0'
+      })
+    ).toEqual({ status: 'unverifiable', reason: 'pid_reused' })
+  })
+
+  it('does not claim identity across a multiplexer boundary', () => {
+    const inventory = parseWslGuestProcessInventoryPayload(
+      payload(
+        [
+          'row 100 90 90 100 110 pts/0 Ss+ 12345 bash',
+          'row 110 100 100 110 110 pts/0 S+ 12346 tmux new-session',
+          'row 120 110 110 120 120 pts/1 Sl+ 12347 codex'
+        ].join('\n'),
+        3
+      ),
+      'Ubuntu'
+    )
+    expect(
+      resolveWslGuestForegroundProcess(inventory, {
+        distro: 'Ubuntu',
+        bootId,
+        shellPid: 100,
+        shellStartTime: 12345,
+        tty: '/dev/pts/0'
+      })
+    ).toEqual({ status: 'unverifiable', reason: 'multiplexer_boundary' })
+  })
+
+  it('single-flights and memoizes independently per distro', async () => {
+    let calls = 0
+    let now = 0
+    const reader = createWslGuestProcessInventoryReader({
+      now: () => now,
+      run: async (distro) => {
+        calls += 1
+        return {
+          status: 'ok',
+          inventory: { distro, bootId, rows: [] }
+        }
+      }
+    })
+    const [a, b] = await Promise.all([reader.read(' Ubuntu '), reader.read('ubuntu')])
+    expect(a).toEqual(b)
+    expect(calls).toBe(1)
+    await reader.read('Debian')
+    expect(calls).toBe(2)
+    now = 501
+    await reader.read('Ubuntu')
+    expect(calls).toBe(3)
+  })
+
+  it.each([1, 8, 32])('uses one guest inventory for a %s-pane burst', async (paneCount) => {
+    let calls = 0
+    const reader = createWslGuestProcessInventoryReader({
+      run: async (distro) => {
+        calls += 1
+        return { status: 'ok', inventory: { distro, bootId, rows: [] } }
+      }
+    })
+    await Promise.all(Array.from({ length: paneCount }, () => reader.read('Ubuntu')))
+    expect(calls).toBe(1)
+  })
+
+  it('uses the fenced --exec command and reports a missing ps as unverifiable', async () => {
+    runProcessMock.mockResolvedValue({ code: 127, stdout: '', stderr: '', timedOut: false })
+    resetWslGuestProcessInventoryForTests()
+    await expect(readWslGuestProcessInventory('Ubuntu')).resolves.toEqual({
+      status: 'unverifiable',
+      reason: 'ps_unavailable'
+    })
+    const spec = runProcessMock.mock.calls[0]?.[0]
+    expect(spec.args).toContain('--exec')
+    expect(spec.args).toContain('sh')
+    expect(spec.args.join(' ')).not.toMatch(/__ORCA_WSL_CAPTURE_BEGIN_[^$]/)
+    expect(spec.env.ORCA_WSL_CAPTURE_NONCE).toMatch(/^[a-z0-9]+$/)
+  })
+})
diff --git a/src/main/providers/wsl-guest-process-inventory.ts b/src/main/providers/wsl-guest-process-inventory.ts
new file mode 100644
index 00000000000..8c43e11add5
--- /dev/null
+++ b/src/main/providers/wsl-guest-process-inventory.ts
@@ -0,0 +1,197 @@
+import { runProcess } from '../../shared/child-process/run-process'
+import {
+  buildWslCapturedLoginShellCommand,
+  buildWslExecArgs
+} from '../../shared/wsl-login-shell-command'
+import { resolveWslExecutablePath } from '../wsl/wsl-executable-path'
+import { parseWslGuestProcessInventoryPayload } from './wsl-guest-process-inventory-parser'
+import type { WslGuestProcessInventory } from './wsl-guest-process-inventory-parser'
+
+export { parseWslGuestProcessInventoryPayload } from './wsl-guest-process-inventory-parser'
+export type {
+  WslGuestProcessInventory,
+  WslGuestProcessRow
+} from './wsl-guest-process-inventory-parser'
+export { resolveWslGuestForegroundProcess } from './wsl-guest-foreground-process-resolution'
+export type {
+  WslGuestForegroundResolution,
+  WslGuestProcessAnchor
+} from './wsl-guest-foreground-process-resolution'
+
+export type WslGuestProcessInventoryRead =
+  | { status: 'ok'; inventory: WslGuestProcessInventory }
+  | { status: 'unverifiable'; reason: WslGuestProcessInventoryFailureReason }
+
+export type WslGuestProcessInventoryFailureReason =
+  | 'wsl_unavailable'
+  | 'capture_failed'
+  | 'capture_timed_out'
+  | 'capture_malformed'
+  | 'ps_unavailable'
+  | 'boot_id_missing'
+
+const INVENTORY_TIMEOUT_MS = 5_000
+const INVENTORY_MAX_OUTPUT_BYTES = 4 * 1024 * 1024
+const INVENTORY_TTL_MS = 500
+const CAPTURE_NONCE_ENV = 'ORCA_WSL_CAPTURE_NONCE'
+
+/**
+ * The command is deliberately shell text behind the capture fence. `--exec`
+ * is mandatory: a bare `--` lets wsl.exe expand `$name` in every argument.
+ * The last `ps` field is read as one remainder so whitespace in args is kept.
+ */
+export const WSL_GUEST_INVENTORY_SCRIPT = [
+  'set -u',
+  '_orca_boot=$(cat /proc/sys/kernel/random/boot_id 2>/dev/null) || exit 125',
+  'case "$_orca_boot" in *[!A-Fa-f0-9-]*|"") exit 125 ;; esac',
+  'printf "boot %s\\n" "$_orca_boot"',
+  '_orca_ps=$(ps -axo pid=,ppid=,sid=,pgid=,tpgid=,tty=,stat=,args= 2>/dev/null) || exit 127',
+  '_orca_expected=0',
+  'while IFS= read -r _orca_line; do',
+  '  [ -n "$_orca_line" ] && _orca_expected=$((_orca_expected + 1))',
+  'done <<EOF',
+  '$_orca_ps',
+  'EOF',
+  '_orca_seen=0',
+  'while IFS= read -r _orca_line; do',
+  '  [ -n "$_orca_line" ] || { continue; }',
+  '  IFS=" " read -r _orca_pid _orca_ppid _orca_sid _orca_pgid _orca_tpgid _orca_tty _orca_stat _orca_args <<EOF',
+  '$_orca_line',
+  'EOF',
+  '  _orca_procstat=$(cat "/proc/$_orca_pid/stat" 2>/dev/null) || { printf "error start_time\\n"; exit 1; }',
+  '  _orca_after=${_orca_procstat##*) }',
+  '  IFS=" " read -r _orca_dummy1 _orca_dummy2 _orca_dummy3 _orca_dummy4 _orca_dummy5 _orca_dummy6 _orca_dummy7 _orca_dummy8 _orca_dummy9 _orca_dummy10 _orca_dummy11 _orca_dummy12 _orca_dummy13 _orca_dummy14 _orca_dummy15 _orca_dummy16 _orca_dummy17 _orca_dummy18 _orca_dummy19 _orca_start _orca_rest <<EOF',
+  '$_orca_after',
+  'EOF',
+  '  case "$_orca_start" in ""|*[!0-9]*) printf "error start_time\\n"; exit 1 ;; esac',
+  '  printf "row %s %s %s %s %s %s %s %s %s\\n" "$_orca_pid" "$_orca_ppid" "$_orca_sid" "$_orca_pgid" "$_orca_tpgid" "$_orca_tty" "$_orca_stat" "$_orca_start" "$_orca_args"',
+  '  _orca_seen=$((_orca_seen + 1))',
+  'done <<EOF',
+  '$_orca_ps',
+  'EOF',
+  'printf "count %s %s\\n" "$_orca_seen" "$_orca_expected"'
+].join('\n')
+
+type ReaderDeps = {
+  run?: (distro: string) => Promise<WslGuestProcessInventoryRead>
+  now?: () => number
+  ttlMs?: number
+}
+
+/** Construct a per-distro single-flight/TTL reader; exported for deterministic tests. */
+export function createWslGuestProcessInventoryReader(deps: ReaderDeps = {}): {
+  read: (distro: string) => Promise<WslGuestProcessInventoryRead>
+  reset: () => void
+} {
+  const now = deps.now ?? (() => Date.now())
+  const ttlMs = deps.ttlMs ?? INVENTORY_TTL_MS
+  const cached = new Map<string, { value: WslGuestProcessInventoryRead; at: number }>()
+  const inFlight = new Map<string, Promise<WslGuestProcessInventoryRead>>()
+  const run = deps.run ?? runWslGuestProcessInventory
+
+  const read = (distro: string): Promise<WslGuestProcessInventoryRead> => {
+    const cleanedDistro = distro.trim()
+    const key = cleanedDistro.toLowerCase()
+    const prior = cached.get(key)
+    if (prior && now() - prior.at < ttlMs) {
+      return Promise.resolve(prior.value)
+    }
+    const active = inFlight.get(key)
+    if (active) {
+      return active
+    }
+    const pending = run(cleanedDistro)
+      .catch((): WslGuestProcessInventoryRead => ({
+        status: 'unverifiable',
+        reason: 'capture_failed'
+      }))
+      .then((value) => {
+        cached.set(key, { value, at: now() })
+        return value
+      })
+      .finally(() => {
+        if (inFlight.get(key) === pending) {
+          inFlight.delete(key)
+        }
+      })
+    inFlight.set(key, pending)
+    return pending
+  }
+  return {
+    read,
+    reset: () => {
+      cached.clear()
+      inFlight.clear()
+    }
+  }
+}
+
+async function runWslGuestProcessInventory(distro: string): Promise<WslGuestProcessInventoryRead> {
+  const captureNonce = `${Date.now().toString(36)}${Math.random().toString(36).slice(2, 10)}`
+  const captured = buildWslCapturedLoginShellCommand(WSL_GUEST_INVENTORY_SCRIPT, captureNonce, {
+    nonceEnvVar: CAPTURE_NONCE_ENV
+  })
+  let result
+  try {
+    const wslenvEntries = (process.env.WSLENV ?? '').split(':').filter(Boolean)
+    const nonceEntry = `${CAPTURE_NONCE_ENV}/u`
+    const nonceEntryIndex = wslenvEntries.findIndex(
+      (entry) => entry.split('/')[0] === CAPTURE_NONCE_ENV
+    )
+    if (nonceEntryIndex === -1) {
+      wslenvEntries.push(nonceEntry)
+    } else {
+      wslenvEntries[nonceEntryIndex] = nonceEntry
+    }
+    result = await runProcess({
+      program: resolveWslExecutablePath(),
+      args: buildWslExecArgs(distro, ['sh', '-c', captured.command]),
+      env: {
+        ...process.env,
+        WSL_UTF8: '1',
+        WSLENV: wslenvEntries.join(':'),
+        [CAPTURE_NONCE_ENV]: captureNonce
+      },
+      timeoutMs: INVENTORY_TIMEOUT_MS,
+      maxOutputBytes: INVENTORY_MAX_OUTPUT_BYTES
+    })
+  } catch {
+    return { status: 'unverifiable', reason: 'wsl_unavailable' }
+  }
+  if (result.timedOut) {
+    return { status: 'unverifiable', reason: 'capture_timed_out' }
+  }
+  if (result.code === 127) {
+    return { status: 'unverifiable', reason: 'ps_unavailable' }
+  }
+  const payload = captured.readStdout(result.stdout)
+  if (payload === null) {
+    return { status: 'unverifiable', reason: 'capture_malformed' }
+  }
+  if (result.code !== 0) {
+    return { status: 'unverifiable', reason: 'capture_failed' }
+  }
+  try {
+    return { status: 'ok', inventory: parseWslGuestProcessInventoryPayload(payload, distro) }
+  } catch (error) {
+    return {
+      status: 'unverifiable',
+      reason:
+        error instanceof Error && error.message === 'boot_id_missing'
+          ? 'boot_id_missing'
+          : 'capture_malformed'
+    }
+  }
+}
+
+const defaultReader = createWslGuestProcessInventoryReader()
+
+export function readWslGuestProcessInventory(
+  distro: string
+): Promise<WslGuestProcessInventoryRead> {
+  return defaultReader.read(distro)
+}
+
+export function resetWslGuestProcessInventoryForTests(): void {
+  defaultReader.reset()
+}
diff --git a/src/main/pty/wsl-orca-env.test.ts b/src/main/pty/wsl-orca-env.test.ts
index cc79e2bb054..71663a84874 100644
--- a/src/main/pty/wsl-orca-env.test.ts
+++ b/src/main/pty/wsl-orca-env.test.ts
@@ -13,7 +13,7 @@ describe('addOrcaWslInteropEnv', () => {
 
     addOrcaWslInteropEnv(env)
 
-    expect(env.WSLENV).toBe('ORCA_TERMINAL_HANDLE/u:ORCA_SHELL_READY_ROOT/p')
+    expect(env.WSLENV).toBe('ORCA_TERMINAL_HANDLE/u:ORCA_SHELL_READY_ROOT/p:ORCA_SHELL_FEATURES/u')
   })
 
   // Why this is published at all: the wrapper tree is content-addressed, so the
@@ -42,6 +42,7 @@ describe('addOrcaWslInteropEnv', () => {
 
     expect(env.WSLENV?.split(':')).toEqual([
       'ORCA_SHELL_READY_ROOT/p',
+      'ORCA_SHELL_FEATURES/u',
       `${SETUP_AGENT_SEQUENCE_STARTUP_COMMAND_ENV}/u`,
       `${SETUP_AGENT_SEQUENCE_STARTUP_SCRIPT_ENV}/u`
     ])
@@ -54,7 +55,9 @@ describe('addOrcaWslInteropEnv', () => {
 
     addOrcaWslInteropEnv(env)
 
-    expect(env.WSLENV).toBe('FOO/u:ORCA_TERMINAL_HANDLE/u:BAR/p:ORCA_SHELL_READY_ROOT/p')
+    expect(env.WSLENV).toBe(
+      'FOO/u:ORCA_TERMINAL_HANDLE/u:BAR/p:ORCA_SHELL_READY_ROOT/p:ORCA_SHELL_FEATURES/u'
+    )
   })
 
   it('marks OMP status and hook env for Windows to WSL import', () => {
@@ -195,7 +198,7 @@ describe('addOrcaWslInteropEnv', () => {
 
     addOrcaWslInteropEnv(env)
 
-    expect(env.WSLENV).toBe('ORCA_SHELL_READY_ROOT/p:ORCA_WORKSPACE_NAME/u')
+    expect(env.WSLENV).toBe('ORCA_SHELL_READY_ROOT/p:ORCA_SHELL_FEATURES/u:ORCA_WORKSPACE_NAME/u')
   })
 
   it('does not register setup vars that are absent from the env', () => {
@@ -203,7 +206,7 @@ describe('addOrcaWslInteropEnv', () => {
 
     addOrcaWslInteropEnv(env)
 
-    expect(env.WSLENV).toBe('ORCA_TERMINAL_HANDLE/u:ORCA_SHELL_READY_ROOT/p')
+    expect(env.WSLENV).toBe('ORCA_TERMINAL_HANDLE/u:ORCA_SHELL_READY_ROOT/p:ORCA_SHELL_FEATURES/u')
   })
 
   it('marks the WSL hook relay version for import on relay spawn envs', () => {
@@ -211,7 +214,9 @@ describe('addOrcaWslInteropEnv', () => {
       ORCA_WSL_HOOK_RELAY_VERSION: '0.1.0+abc'
     }
     addOrcaWslInteropEnv(env)
-    expect(env.WSLENV).toBe('ORCA_SHELL_READY_ROOT/p:ORCA_WSL_HOOK_RELAY_VERSION/u')
+    expect(env.WSLENV).toBe(
+      'ORCA_SHELL_READY_ROOT/p:ORCA_SHELL_FEATURES/u:ORCA_WSL_HOOK_RELAY_VERSION/u'
+    )
   })
 
   it('crosses a guest-side OpenCode config overlay untranslated (/u)', () => {
diff --git a/src/main/pty/wsl-orca-env.ts b/src/main/pty/wsl-orca-env.ts
index 262df20b3b2..a3079909883 100644
--- a/src/main/pty/wsl-orca-env.ts
+++ b/src/main/pty/wsl-orca-env.ts
@@ -58,6 +58,26 @@ export function addOrcaWslInteropEnv(env: Record<string, string>): void {
   // are always the local file set -- windows-shell-args.ts is shared by the
   // in-process provider and the daemon spawner, so both resolve the same tree.
   env.ORCA_SHELL_READY_ROOT = getShellReadyWrapperRoot()
+  // WSL's host-side process is always wsl.exe. Ask the guest wrapper to emit
+  // its shell identity marker so process evidence can anchor to the guest PID.
+  // The feature selection crosses through WSLENV, never the wsl.exe argv.
+  const existingFeatures = env.ORCA_SHELL_FEATURES?.split(',').filter(Boolean) ?? []
+  const overlayFeatures = [
+    'ORCA_OPENCODE_CONFIG_DIR',
+    'ORCA_MIMOCODE_HOME',
+    'ORCA_OMP_STATUS_EXTENSION',
+    'ORCA_CODEX_HOME',
+    'ORCA_AGENT_TEAMS_SHIM_DIR',
+    'ORCA_REMOTE_CLI_BIN_DIR'
+  ].some((key) => Boolean(env[key]))
+  env.ORCA_SHELL_FEATURES = [
+    ...new Set([
+      ...existingFeatures,
+      ...(overlayFeatures ? ['overlay'] : []),
+      'markers',
+      'identity'
+    ])
+  ].join(',')
   // Why: the endpoint is a Windows path (/p-translated so the guest reads it
   // via /mnt/c) until the WSL hook relay reports the guest home — then it is
   // already a guest-side POSIX path and must cross untranslated.
@@ -76,6 +96,7 @@ export function addOrcaWslInteropEnv(env: Record<string, string>): void {
     // Why /p: the guest reads the content-addressed wrapper tree through /mnt/c,
     // and it cannot derive the hash segment from ORCA_USER_DATA_PATH alone.
     'ORCA_SHELL_READY_ROOT/p',
+    'ORCA_SHELL_FEATURES/u',
     'ORCA_CLI_COMMAND/u',
     'ORCA_CODEX_LAUNCH_PREFLIGHT/p',
     'ORCA_PANE_KEY/u',
diff --git a/src/main/shell-startup-identity-scanner.test.ts b/src/main/shell-startup-identity-scanner.test.ts
index 2b1607c23e6..80da515927a 100644
--- a/src/main/shell-startup-identity-scanner.test.ts
+++ b/src/main/shell-startup-identity-scanner.test.ts
@@ -18,6 +18,37 @@ describe('shell startup identity scanner', () => {
     })
   })
 
+  it('parses a fenced WSL identity anchor', () => {
+    const state = createShellStartupIdentityScanState()
+    const result = scanForShellStartupIdentity(
+      state,
+      'x\x1b]777;orca-shell-start:v2:Ubuntu-24.04:01234567-89ab-cdef-0123-456789abcdef:123:456:/dev/pts/8\x07y'
+    )
+    expect(result).toEqual({
+      output: 'xy',
+      shellPid: 123,
+      shellIdentity: {
+        distro: 'Ubuntu-24.04',
+        bootId: '01234567-89ab-cdef-0123-456789abcdef',
+        shellPid: 123,
+        shellStartTime: 456,
+        tty: '/dev/pts/8'
+      }
+    })
+  })
+
+  it('holds a split v2 anchor until the BEL terminator', () => {
+    const state = createShellStartupIdentityScanState()
+    const first =
+      '\x1b]777;orca-shell-start:v2:Ubuntu:01234567-89ab-cdef-0123-456789abcdef:12:34:/dev/pts/'
+    expect(scanForShellStartupIdentity(state, first)).toEqual({ output: '', shellPid: null })
+    expect(scanForShellStartupIdentity(state, '2\x07ok')).toMatchObject({
+      output: 'ok',
+      shellPid: 12,
+      shellIdentity: { distro: 'Ubuntu', shellStartTime: 34, tty: '/dev/pts/2' }
+    })
+  })
+
   it('forwards lookalikes unchanged', () => {
     const state = createShellStartupIdentityScanState()
     const input = 'a\x1b]777;orca-shell-start:nope\x07b'
diff --git a/src/main/shell-startup-identity-scanner.ts b/src/main/shell-startup-identity-scanner.ts
index 234b69e6bbf..6a56413f8e7 100644
--- a/src/main/shell-startup-identity-scanner.ts
+++ b/src/main/shell-startup-identity-scanner.ts
@@ -1,4 +1,7 @@
+import type { WslShellProcessAnchor } from '../shared/wsl-shell-process-anchor'
+
 export const SHELL_STARTUP_IDENTITY_PREFIX = '\x1b]777;orca-shell-start:'
+const POSSIBLE_V2_SUFFIX = /^v2(?::[A-Za-z0-9._/:-]{0,220})?$/
 const POSSIBLE_PID_SUFFIX = /^\d{0,20}$/
 
 export type ShellStartupIdentityScanState = {
@@ -8,6 +11,8 @@ export type ShellStartupIdentityScanState = {
 export type ShellStartupIdentityScanResult = {
   output: string
   shellPid: number | null
+  /** Full WSL identity; legacy PID-only markers intentionally do not qualify. */
+  shellIdentity?: WslShellProcessAnchor
 }
 
 export function createShellStartupIdentityScanState(): ShellStartupIdentityScanState {
@@ -28,7 +33,35 @@ function isPossibleMarker(candidate: string): boolean {
     return false
   }
   const suffix = candidate.slice(SHELL_STARTUP_IDENTITY_PREFIX.length)
-  return POSSIBLE_PID_SUFFIX.test(suffix)
+  return POSSIBLE_PID_SUFFIX.test(suffix) || POSSIBLE_V2_SUFFIX.test(suffix)
+}
+
+function parseIdentitySuffix(suffix: string): WslShellProcessAnchor | null {
+  const fields = suffix.split(':')
+  if (fields.length !== 6 || fields[0] !== 'v2') {
+    return null
+  }
+  const [, distro, bootId, pidText, startText, tty] = fields
+  if (
+    !distro ||
+    !/^[A-Za-z0-9._-]{1,128}$/.test(distro) ||
+    !bootId ||
+    !/^[A-Fa-f0-9-]{8,128}$/.test(bootId) ||
+    !/^\d{1,20}$/.test(pidText ?? '') ||
+    !/^\d{1,30}$/.test(startText ?? '') ||
+    !/^\/dev\/pts\/\d{1,8}$/.test(tty ?? '')
+  ) {
+    return null
+  }
+  const shellPid = Number(pidText)
+  const shellStartTime = Number(startText)
+  if (!Number.isSafeInteger(shellPid) || shellPid <= 0) {
+    return null
+  }
+  if (!Number.isSafeInteger(shellStartTime) || shellStartTime < 0) {
+    return null
+  }
+  return { distro, bootId, shellPid, shellStartTime, tty: tty! }
 }
 
 export function scanForShellStartupIdentity(
@@ -63,6 +96,15 @@ export function scanForShellStartupIdentity(
           shellPid: Number.isSafeInteger(shellPid) && shellPid > 0 ? shellPid : null
         }
       }
+      const identity = parseIdentitySuffix(terminator === -1 ? suffix : suffix.slice(0, terminator))
+      if (identity) {
+        const markerLength = SHELL_STARTUP_IDENTITY_PREFIX.length + terminator + 1
+        return {
+          output: output + candidate.slice(markerLength),
+          shellPid: identity.shellPid,
+          shellIdentity: identity
+        }
+      }
     }
     output += candidate[0]
     pending = candidate.slice(1)
diff --git a/src/main/shell-templates.ts b/src/main/shell-templates.ts
index cb7c2fca2e9..11e9cf35cf6 100644
--- a/src/main/shell-templates.ts
+++ b/src/main/shell-templates.ts
@@ -39,7 +39,31 @@ __orca_has_feature() { [[ "$_orca_shell_features" == *",$1,"* ]]; }`
 
 // Why one line usable by both languages: __orca_has_feature is defined with the
 // same name and semantics in the zsh and bash channel blocks above.
-export const SHELL_STARTUP_IDENTITY_MARKER_BLOCK = `__orca_has_feature identity && printf "\\033]777;orca-shell-start:%s\\007" "$$"`
+/** Emits a fenced WSL shell identity. The marker is output-only; no identity
+ * value is put in wsl.exe argv where another Windows process could read it. */
+export const SHELL_STARTUP_IDENTITY_MARKER_BLOCK = `if __orca_has_feature identity; then
+  if [ -n "\${WSL_DISTRO_NAME:-}" ]; then
+    __orca_emit_shell_identity() {
+      local _orca_boot _orca_stat _orca_tail _orca_start _orca_tty _orca_distro
+      _orca_boot=$(cat /proc/sys/kernel/random/boot_id 2>/dev/null) || return 0
+      _orca_stat=$(cat /proc/$$/stat 2>/dev/null) || return 0
+      _orca_tail=\${_orca_stat##*) }
+      set -- $_orca_tail
+      _orca_start=\${20:-}
+      _orca_tty=$(tty 2>/dev/null) || return 0
+      _orca_distro=\${WSL_DISTRO_NAME:-}
+      case "$_orca_boot" in *[!A-Fa-f0-9-]*|"") return 0 ;; esac
+      case "$_orca_distro" in ""|*[!A-Za-z0-9._-]*) return 0 ;; esac
+      case "$_orca_start" in ""|*[!0-9]*) return 0 ;; esac
+      case "$_orca_tty" in /dev/pts/[0-9]*) ;; *) return 0 ;; esac
+      printf "\\033]777;orca-shell-start:v2:%s:%s:%s:%s:%s\\007" "$_orca_distro" "$_orca_boot" "$$" "$_orca_start" "$_orca_tty"
+    }
+    __orca_emit_shell_identity
+    unset -f __orca_emit_shell_identity
+  else
+    printf "\\033]777;orca-shell-start:%s\\007" "$$"
+  fi
+fi`
 
 /**
  * The first executable lines of the wrapper: give ZDOTDIR back to the user.
diff --git a/src/shared/pty-listed-session.ts b/src/shared/pty-listed-session.ts
index 064477dd12a..a7f9bf410b5 100644
--- a/src/shared/pty-listed-session.ts
+++ b/src/shared/pty-listed-session.ts
@@ -22,6 +22,8 @@ export type PtyListedSession = {
    * Manager force-kill live agent sessions (#8459).
    */
   agentOwnership: AgentOwnershipEvidence
+  /** Optional process evidence from the execution host; absent on older providers. */
+  foregroundProcessEvidence?: ForegroundProcessEvidence
 }
 
 /** Only proven absence authorizes destroying a session without asking. */
@@ -30,3 +32,4 @@ export function mayDestroyWithoutOwnerEvidence(session: {
 }): boolean {
   return session.agentOwnership === 'absent'
 }
+import type { ForegroundProcessEvidence } from './foreground-process-evidence'
diff --git a/src/shared/wsl-login-shell-command.test.ts b/src/shared/wsl-login-shell-command.test.ts
index 76217c297bc..4c632cda37a 100644
--- a/src/shared/wsl-login-shell-command.test.ts
+++ b/src/shared/wsl-login-shell-command.test.ts
@@ -5,6 +5,7 @@ import { join } from 'node:path'
 import { describe, expect, it } from 'vitest'
 import {
   buildWslCapturedLoginShellCommand,
+  buildWslCapturedLoginShellCommandFromEnv,
   buildWslExecArgs,
   buildWslInteractiveLoginShellCommand,
   buildWslLoginShellCommand,
@@ -241,6 +242,22 @@ describe('wsl login shell command helpers', () => {
       expect(captured.command).toContain('exit $_orca_capture_status')
     })
 
+    it('keeps an env-delivered nonce out of the command argv', () => {
+      const captured = buildWslCapturedLoginShellCommandFromEnv(
+        'printf payload',
+        'ORCA_WSL_CAPTURE_NONCE',
+        'nonce-env'
+      )
+      expect(captured.command).not.toContain('nonce-env')
+      expect(captured.command).toContain('${ORCA_WSL_CAPTURE_NONCE:-}')
+      expectValidShSyntax(captured.command)
+      expect(
+        captured.readStdout(
+          `noise\n__ORCA_WSL_CAPTURE_BEGIN_nonce-env__payload__ORCA_WSL_CAPTURE_END_nonce-env__`
+        )
+      ).toBe('payload')
+    })
+
     it('keeps payload bytes that themselves contain a fence', () => {
       // Why a per-call nonce: `cat` of a file quoting a fixed marker would
       // otherwise be truncated at the quote.
diff --git a/src/shared/wsl-login-shell-command.ts b/src/shared/wsl-login-shell-command.ts
index fd0f0b505c9..54524183ce6 100644
--- a/src/shared/wsl-login-shell-command.ts
+++ b/src/shared/wsl-login-shell-command.ts
@@ -49,6 +49,11 @@ export type WslCapturedLoginShellCommand = {
   endMarker: string
 }
 
+export type WslCapturedLoginShellOptions = {
+  /** Supply the nonce through this env var instead of embedding it in argv. */
+  nonceEnvVar?: string
+}
+
 // Why: the fence has to be absent from both the rc output ahead of it and the
 // payload behind it. A per-call nonce is the only spelling that guarantees
 // both -- `cat`-ing a file that happens to quote a fixed marker would otherwise
@@ -70,8 +75,12 @@ function nextWslCaptureNonce(): string {
  */
 export function buildWslCapturedLoginShellCommand(
   command: string,
-  nonce: string = nextWslCaptureNonce()
+  nonce: string = nextWslCaptureNonce(),
+  options: WslCapturedLoginShellOptions = {}
 ): WslCapturedLoginShellCommand {
+  if (options.nonceEnvVar) {
+    return buildWslCapturedLoginShellCommandFromEnv(command, options.nonceEnvVar, nonce)
+  }
   const begin = `__ORCA_WSL_CAPTURE_BEGIN_${nonce}__`
   const end = `__ORCA_WSL_CAPTURE_END_${nonce}__`
   return {
@@ -104,6 +113,49 @@ export function buildWslCapturedLoginShellCommand(
   }
 }
 
+/**
+ * Variant of the capture fence that receives its nonce from an environment
+ * variable. This keeps the nonce out of the wsl.exe command line (which is
+ * visible to other Windows processes) while retaining the login-shell fence.
+ */
+export function buildWslCapturedLoginShellCommandFromEnv(
+  command: string,
+  nonceEnvVar: string,
+  nonce: string = nextWslCaptureNonce()
+): WslCapturedLoginShellCommand {
+  const begin = `__ORCA_WSL_CAPTURE_BEGIN_${nonce}__`
+  const end = `__ORCA_WSL_CAPTURE_END_${nonce}__`
+  const envName = nonceEnvVar
+  if (!/^[A-Za-z_][A-Za-z0-9_]*$/.test(envName)) {
+    throw new Error('invalid_capture_nonce_env')
+  }
+  const fenced = [
+    `_orca_capture_nonce="\${${envName}:-}"`,
+    '[ -n "$_orca_capture_nonce" ] || exit 125',
+    '_orca_capture_begin="__ORCA_WSL_CAPTURE_BEGIN_${_orca_capture_nonce}__"',
+    '_orca_capture_end="__ORCA_WSL_CAPTURE_END_${_orca_capture_nonce}__"',
+    'printf %s "$_orca_capture_begin"',
+    command,
+    '_orca_capture_status=$?',
+    'printf %s "$_orca_capture_end"',
+    'exit $_orca_capture_status'
+  ].join('\n')
+  return {
+    beginMarker: begin,
+    endMarker: end,
+    command: buildWslLoginShellCommand(fenced),
+    readStdout: (stdout) => {
+      const beginIndex = stdout.lastIndexOf(begin)
+      if (beginIndex === -1) {
+        return null
+      }
+      const payloadStart = beginIndex + begin.length
+      const endIndex = stdout.indexOf(end, payloadStart)
+      return endIndex === -1 ? stdout.slice(payloadStart) : stdout.slice(payloadStart, endIndex)
+    }
+  }
+}
+
 export function buildWslInteractiveLoginShellCommand(): string {
   return [
     '_orca_wsl_shell=$(getent passwd "$(id -un)" 2>/dev/null | cut -d: -f7)',
diff --git a/src/shared/wsl-shell-process-anchor.ts b/src/shared/wsl-shell-process-anchor.ts
new file mode 100644
index 00000000000..a87fd3c2c2e
--- /dev/null
+++ b/src/shared/wsl-shell-process-anchor.ts
@@ -0,0 +1,8 @@
+/** Identity of the shell process that owns a WSL PTY. */
+export type WslShellProcessAnchor = {
+  distro: string
+  bootId: string
+  shellPid: number
+  shellStartTime: number
+  tty: string
+}