diff --git a/src/main/wsl/wsl-orcad-chat-provider-fixture.ts b/src/main/wsl/wsl-orcad-chat-provider-fixture.ts
index 24f0f04f47f..faf40f206a0 100644
--- a/src/main/wsl/wsl-orcad-chat-provider-fixture.ts
+++ b/src/main/wsl/wsl-orcad-chat-provider-fixture.ts
@@ -2,7 +2,7 @@ import { z } from 'zod'
 import { folderWorkspaceKey } from '../../shared/workspace-scope'
 import { readFileSync } from 'node:fs'
 import { resolve } from 'node:path'
-import { shellEscape } from '../ssh/ssh-connection-utils'
+import { quotePosixShell } from '../../shared/shell-argument-quoting'
 
 export type WslChatHost = {
   rpc<T>(method: string, params?: unknown): Promise<T>
@@ -16,7 +16,7 @@ export async function writeChatFixtureFile(
   content: string
 ): Promise<void> {
   await host.guest(
-    `printf %s ${shellEscape(Buffer.from(content).toString('base64'))} | base64 -d > ${shellEscape(path)}`
+    `printf %s ${quotePosixShell(Buffer.from(content).toString('base64'))} | base64 -d > ${quotePosixShell(path)}`
   )
 }
 
@@ -24,7 +24,7 @@ export async function writeChatFixtureFile(
 export async function installWslChatFixture(lane: WslChatHost) {
   const home = (await lane.guest('printf %s "$HOME"')).trim()
   const root = `${home}/wsl chat fixture`
-  await lane.guest(`mkdir -p ${shellEscape(root)}`)
+  await lane.guest(`mkdir -p ${quotePosixShell(root)}`)
   const runtime = (await lane.guest(`readlink -f /proc/${lane.runtimePid}/exe`)).trim()
   const script = `${root}/scripted.mjs`
   const cli = `${root}/claude`
@@ -36,13 +36,13 @@ export async function installWslChatFixture(lane: WslChatHost) {
   await writeChatFixtureFile(
     lane,
     cli,
-    `#!/bin/sh\nexec ${shellEscape(runtime)} ${shellEscape(script)} "$@"\n`
+    `#!/bin/sh\nexec ${quotePosixShell(runtime)} ${quotePosixShell(script)} "$@"\n`
   )
-  await lane.guest(`chmod 700 ${shellEscape(cli)}`)
+  await lane.guest(`chmod 700 ${quotePosixShell(cli)}`)
   await lane.rpc('settings.mutateAgentLaunch', {
     type: 'command',
     agent: 'claude',
-    value: shellEscape(cli)
+    value: quotePosixShell(cli)
   })
   await lane.rpc('settings.update', {
     nativeChatPermissionMode: 'ask',
@@ -58,7 +58,7 @@ export async function installWslChatFixture(lane: WslChatHost) {
     name: 'WSL chat lane'
   })
   const folderPath = `${root}/folder project`
-  await lane.guest(`mkdir -p ${shellEscape(folderPath)}`)
+  await lane.guest(`mkdir -p ${quotePosixShell(folderPath)}`)
   const folder = await lane.rpc<{ folderWorkspace: { id: string } }>('folderWorkspace.create', {
     projectGroupId: group.group.id,
     folderPath,
diff --git a/src/main/wsl/wsl-orcad-structured-chat-contract.ts b/src/main/wsl/wsl-orcad-structured-chat-contract.ts
index 89d4066406f..4f38c7a36e4 100644
--- a/src/main/wsl/wsl-orcad-structured-chat-contract.ts
+++ b/src/main/wsl/wsl-orcad-structured-chat-contract.ts
@@ -15,7 +15,7 @@ import {
 } from '../../shared/remote-runtime-client'
 import { claudeSessionIdForOrcaSession } from '../claude/claude-structured-session-id'
 import { packagedClaudeChatScenario } from '../orcad/orcad-structured-chat-scenario'
-import { shellEscape } from '../ssh/ssh-connection-utils'
+import { quotePosixShell } from '../../shared/shell-argument-quoting'
 import { wslClaudeChatScenario } from './wsl-orcad-chat-scenario'
 import {
   installWslChatFixture,
@@ -55,7 +55,7 @@ async function exerciseChat(lane: ChatLane, root: string, worktree: string, cwd:
   const ackPath = `${root}/partial-observed`
   const scenarioPath = `${root}/scenario.json`
   const reportPath = `${root}/report.json`
-  await lane.guest(`rm -f ${shellEscape(ackPath)}`)
+  await lane.guest(`rm -f ${quotePosixShell(ackPath)}`)
   await writeChatFixtureFile(
     lane,
     scenarioPath,
@@ -125,7 +125,7 @@ async function exerciseChat(lane: ChatLane, root: string, worktree: string, cwd:
       upload
     )
     expect(attachment.path).toMatch(/^\//u)
-    expect(await lane.guest(`base64 -w0 ${shellEscape(attachment.path)}`)).toBe(png)
+    expect(await lane.guest(`base64 -w0 ${quotePosixShell(attachment.path)}`)).toBe(png)
     const body = {
       kind: 'message',
       role: 'user',
@@ -150,7 +150,7 @@ async function exerciseChat(lane: ChatLane, root: string, worktree: string, cwd:
     dropping = true
     // Close the actual WSL bridge, not just the chat subscription; the guest owns the turn.
     await lane.reconnect(async () => {
-      await lane.guest(`touch ${shellEscape(ackPath)}`)
+      await lane.guest(`touch ${quotePosixShell(ackPath)}`)
     })
     subscription.close()
     rows.clear()
@@ -186,7 +186,7 @@ async function exerciseChat(lane: ChatLane, root: string, worktree: string, cwd:
       })
     ).toMatchObject({ ok: true, value: { cancelled: true } })
     const report = WslChatProviderReport.parse(
-      JSON.parse(await lane.guest(`cat ${shellEscape(reportPath)}`))
+      JSON.parse(await lane.guest(`cat ${quotePosixShell(reportPath)}`))
     )
     expect(report.cwd).toBe(cwd)
     expect(report.execPath).toMatch(/^\//u)
@@ -260,7 +260,7 @@ async function exerciseChat(lane: ChatLane, root: string, worktree: string, cwd:
       { timeout: 30_000 }
     )
     const resumed = WslChatProviderReport.parse(
-      JSON.parse(await lane.guest(`cat ${shellEscape(reportPath)}`))
+      JSON.parse(await lane.guest(`cat ${quotePosixShell(reportPath)}`))
     )
     expect(resumed.cwd).toBe(cwd)
     expect(resumed.argv.join(' ')).toMatch(new RegExp(`--resume(?:=| )${providerId}`))