diff --git a/frontend/src/lib/components/EditorBar.svelte b/frontend/src/lib/components/EditorBar.svelte
index 81ef6c1c96..2db471e2c8 100644
--- a/frontend/src/lib/components/EditorBar.svelte
+++ b/frontend/src/lib/components/EditorBar.svelte
@@ -105,6 +105,7 @@
 			| 'powershell'
 			| 'bunnative'
 			| 'claudesandbox'
+			| 'pisandbox'
 			| 'wac_python'
 			| 'wac_typescript'
 			| 'ci_test_bun'
diff --git a/frontend/src/lib/components/ScriptBuilder.svelte b/frontend/src/lib/components/ScriptBuilder.svelte
index ad869ed492..f69cf37f1d 100644
--- a/frontend/src/lib/components/ScriptBuilder.svelte
+++ b/frontend/src/lib/components/ScriptBuilder.svelte
@@ -596,6 +596,7 @@
 			| 'powershell'
 			| 'bunnative'
 			| 'claudesandbox'
+			| 'pisandbox'
 			| 'wac_python'
 			| 'wac_typescript'
 			| 'ci_test_bun'
@@ -1543,10 +1544,12 @@
 														(lang == script.language &&
 															template != 'bunnative' &&
 															template != 'docker' &&
-															template != 'claudesandbox') ||
+															template != 'claudesandbox' &&
+															template != 'pisandbox') ||
 														(template == 'bunnative' && lang == 'bunnative') ||
 														(template == 'docker' && lang == 'docker') ||
-														(template == 'claudesandbox' && lang == 'bun')}
+														((template == 'claudesandbox' || template == 'pisandbox') &&
+															lang == 'bun')}
 													<Popover
 														disablePopup={!enterpriseLangs.includes(lang) || !!$enterpriseLicense}
 													>
@@ -1597,6 +1600,21 @@
 										>
 											Claude Sandbox
 										</Button>
+										<Button
+											unifiedSize="xs"
+											variant="default"
+											startIcon={{
+												icon: LanguageIcon,
+												props: { lang: 'pisandbox', width: 16, height: 16 }
+											} as ButtonType.Icon}
+											onclick={() => {
+												template = 'pisandbox'
+												script.language = 'bun'
+												initContent('bun', script.kind, template)
+											}}
+										>
+											Pi Sandbox
+										</Button>
 										<span title="Workflow-as-Code">
 											<Button
 												size="xs2"
diff --git a/frontend/src/lib/components/ScriptEditor.svelte b/frontend/src/lib/components/ScriptEditor.svelte
index 1cabcf8265..8990f70ae5 100644
--- a/frontend/src/lib/components/ScriptEditor.svelte
+++ b/frontend/src/lib/components/ScriptEditor.svelte
@@ -150,6 +150,7 @@
 			| 'powershell'
 			| 'bunnative'
 			| 'claudesandbox'
+			| 'pisandbox'
 			| 'wac_python'
 			| 'wac_typescript'
 			| 'ci_test_bun'
diff --git a/frontend/src/lib/components/common/languageIcons/LanguageIcon.svelte b/frontend/src/lib/components/common/languageIcons/LanguageIcon.svelte
index 617f5206dc..7635b900bb 100644
--- a/frontend/src/lib/components/common/languageIcons/LanguageIcon.svelte
+++ b/frontend/src/lib/components/common/languageIcons/LanguageIcon.svelte
@@ -28,6 +28,7 @@
 	import RIcon from '$lib/components/icons/RIcon.svelte'
 	import ClaudeIcon from '$lib/components/icons/ClaudeIcon.svelte'
 	import DbtIcon from '$lib/components/icons/DbtIcon.svelte'
+	import { Pi } from 'lucide-svelte'
 
 	interface Props {
 		lang:
@@ -41,6 +42,7 @@
 			| 'powershell'
 			| 'bunnative'
 			| 'claudesandbox'
+			| 'pisandbox'
 		width?: number
 		height?: number
 		scale?: number
@@ -50,7 +52,10 @@
 
 	let { lang, width = 30, height = 30, scale = 1, size = undefined, ...rest }: Props = $props()
 
-	const languageLabel: Record<Script['language'] | 'bunnative' | 'claudesandbox', String> = {
+	const languageLabel: Record<
+		Script['language'] | 'bunnative' | 'claudesandbox' | 'pisandbox',
+		String
+	> = {
 		python3: 'Python',
 		deno: 'TypeScript',
 		go: 'Go',
@@ -76,12 +81,21 @@
 		ruby: 'Ruby',
 		rlang: 'R',
 		dbt: 'dbt',
-		claudesandbox: 'Claude Sandbox'
+		claudesandbox: 'Claude Sandbox',
+		pisandbox: 'Pi Sandbox'
 		// for related places search: ADD_NEW_LANG
 	}
 
 	const langToComponent: Record<
-		SupportedLanguage | 'pgsql' | 'javascript' | 'fetch' | 'docker' | 'powershell' | 'bunnative' | 'claudesandbox',
+		| SupportedLanguage
+		| 'pgsql'
+		| 'javascript'
+		| 'fetch'
+		| 'docker'
+		| 'powershell'
+		| 'bunnative'
+		| 'claudesandbox'
+		| 'pisandbox',
 		any
 	> = {
 		go: GoIcon,
@@ -114,7 +128,8 @@
 		rlang: RIcon,
 		duckdb: DuckDbIcon,
 		dbt: DbtIcon,
-		claudesandbox: TypeScriptIcon
+		claudesandbox: TypeScriptIcon,
+		pisandbox: TypeScriptIcon
 		// for related places search: ADD_NEW_LANG
 	}
 
@@ -166,4 +181,14 @@
 			/>
 		</div>
 	{/if}
+	{#if lang === 'pisandbox'}
+		<div
+			class="absolute -top-1.5 -right-1.5 bg-surface rounded-full flex items-center justify-center text-primary"
+			style={`width: ${width * scale * subIconScale}px; height: ${
+				height * scale * subIconScale
+			}px;`}
+		>
+			<Pi size={width * scale * (subIconScale - 0.1)} />
+		</div>
+	{/if}
 </div>
diff --git a/frontend/src/lib/components/flows/content/FlowInputs.svelte b/frontend/src/lib/components/flows/content/FlowInputs.svelte
index f86d870a1a..41d860530a 100644
--- a/frontend/src/lib/components/flows/content/FlowInputs.svelte
+++ b/frontend/src/lib/components/flows/content/FlowInputs.svelte
@@ -291,6 +291,18 @@
 						})
 					}}
 				/>
+				<FlowScriptPicker
+					label="Pi"
+					lang="pisandbox"
+					on:click={() => {
+						dispatch('new', {
+							language: 'bun',
+							kind,
+							subkind: 'pisandbox',
+							summary
+						})
+					}}
+				/>
 			</div>
 		{/if}
 
diff --git a/frontend/src/lib/components/flows/content/FlowInputsQuick.svelte b/frontend/src/lib/components/flows/content/FlowInputsQuick.svelte
index 0b78193c6a..ecb3187c5c 100644
--- a/frontend/src/lib/components/flows/content/FlowInputsQuick.svelte
+++ b/frontend/src/lib/components/flows/content/FlowInputsQuick.svelte
@@ -267,28 +267,33 @@
 	)
 	let aiLength = $derived(showAiRows ? 2 : 0)
 
-	// Must match the heading and label rendered for the AI Sandbox section
 	const aiSandboxHeading = 'AI Sandbox'
-	const aiSandboxLabel = 'Claude Code'
-	let matchesAiSandbox = $derived.by(() => {
+	const aiSandboxes = [
+		{ label: 'Claude Code', subkind: 'claudesandbox' },
+		{ label: 'Pi', subkind: 'pisandbox' }
+	] as const
+	// A query matching the heading keeps every sandbox, otherwise only the ones it names.
+	let matchingAiSandboxes = $derived.by(() => {
 		const query = funcDesc?.trim().toLowerCase() ?? ''
-		if (query.length == 0) {
-			return true
-		}
-		return [aiSandboxHeading, aiSandboxLabel].some((term) => {
+		const matches = (term: string) => {
 			const lowered = term.toLowerCase()
 			return lowered.startsWith(query) || lowered.split(' ').some((w) => w.startsWith(query))
-		})
+		}
+		if (query.length == 0 || matches(aiSandboxHeading)) {
+			return aiSandboxes
+		}
+		return aiSandboxes.filter((s) => matches(s.label))
 	})
-	// Gates the AI Sandbox row and its slot in the index space; both must agree or arrow keys land
-	// on an index that renders nothing.
-	let showAiSandbox = $derived(
+	// Gates the AI Sandbox rows and their slots in the index space; both must agree or arrow keys
+	// land on an index that renders nothing.
+	let aiSandboxRows = $derived(
 		selectedKind === 'script' &&
 			preFilter === 'all' &&
 			!selected &&
 			customUi?.aiSandbox != false &&
-			!$operatorBuilderFlows &&
-			matchesAiSandbox
+			!$operatorBuilderFlows
+			? matchingAiSandboxes
+			: []
 	)
 
 	// Hub runnables carry code the workspace never reviewed, and the backend refuses them in a
@@ -301,7 +306,7 @@
 	let aiOffset = $derived(inlineOffset + (inlineScripts?.length ?? 0))
 	let workspaceOffset = $derived(aiOffset + aiLength)
 	let aiSandboxOffset = $derived(workspaceOffset + (filteredWorkspaceItems?.length ?? 0))
-	let hubOffset = $derived(aiSandboxOffset + (showAiSandbox ? 1 : 0))
+	let hubOffset = $derived(aiSandboxOffset + aiSandboxRows.length)
 </script>
 
 <svelte:window onkeydown={onKeyDown} />
@@ -530,27 +535,29 @@
 			{/await}
 			<div class="pb-1"></div>
 		{/if}
-		{#if showAiSandbox}
+		{#if aiSandboxRows.length > 0}
 			<div class="pb-0 text-2xs font-normal text-secondary ml-2">{aiSandboxHeading}</div>
-			<FlowScriptPickerQuick
-				eeRestricted={false}
-				selected={selectedByKeyboard === aiSandboxOffset}
-				onHover={() => hover(aiSandboxOffset)}
-				enterpriseLangs={[]}
-				label={aiSandboxLabel}
-				lang="claudesandbox"
-				on:click={() => {
-					dispatch('new', {
-						kind: selectedKind,
-						inlineScript: {
-							language: 'bun',
+			{#each aiSandboxRows as sandbox, i (sandbox.subkind)}
+				<FlowScriptPickerQuick
+					eeRestricted={false}
+					selected={selectedByKeyboard === aiSandboxOffset + i}
+					onHover={() => hover(aiSandboxOffset + i)}
+					enterpriseLangs={[]}
+					label={sandbox.label}
+					lang={sandbox.subkind}
+					on:click={() => {
+						dispatch('new', {
 							kind: selectedKind,
-							subkind: 'claudesandbox',
-							summary
-						}
-					})
-				}}
-			/>
+							inlineScript: {
+								language: 'bun',
+								kind: selectedKind,
+								subkind: sandbox.subkind,
+								summary
+							}
+						})
+					}}
+				/>
+			{/each}
 		{/if}
 		{#if showHub && selectedKind != 'preprocessor' && selectedKind != 'flow'}
 			{#if (!selected || selected?.kind === 'integrations') && (preFilter === 'hub' || preFilter === 'all')}
diff --git a/frontend/src/lib/components/flows/flowStateUtils.svelte.ts b/frontend/src/lib/components/flows/flowStateUtils.svelte.ts
index 9d85a07452..030897a63b 100644
--- a/frontend/src/lib/components/flows/flowStateUtils.svelte.ts
+++ b/frontend/src/lib/components/flows/flowStateUtils.svelte.ts
@@ -108,7 +108,7 @@ export async function pickFlow(
 export async function createInlineScriptModule(
 	language: RawScript['language'],
 	kind: Script['kind'],
-	subkind: 'pgsql' | 'flow' | 'claudesandbox' | undefined,
+	subkind: 'pgsql' | 'flow' | 'claudesandbox' | 'pisandbox' | undefined,
 	id: string,
 	summary?: string
 ): Promise<[FlowModule, FlowModuleState]> {
diff --git a/frontend/src/lib/components/flows/map/InsertModuleInner.svelte b/frontend/src/lib/components/flows/map/InsertModuleInner.svelte
index 9cf4bcd264..62ec111b6c 100644
--- a/frontend/src/lib/components/flows/map/InsertModuleInner.svelte
+++ b/frontend/src/lib/components/flows/map/InsertModuleInner.svelte
@@ -117,17 +117,21 @@
 		logReusableAgentUsage('linked')
 		dispatch('new', { kind: 'aiagent', agentPath })
 	}
-	function newClaudeSandbox() {
+	function newAiSandbox(subkind: 'claudesandbox' | 'pisandbox') {
 		dispatch('close')
 		dispatch('new', {
 			kind: 'script',
 			inlineScript: {
 				language: 'bun',
 				kind: 'script',
-				subkind: 'claudesandbox'
+				subkind
 			}
 		})
 	}
+	const aiSandboxes = [
+		{ label: 'Claude Code', subkind: 'claudesandbox' },
+		{ label: 'Pi', subkind: 'pisandbox' }
+	] as const
 
 	// Rows of the AI panes in render order. FlowInputsQuick owns the keyboard index for the other
 	// panes and is unmounted while these render, so the two never fight over Enter or the arrows.
@@ -137,7 +141,7 @@
 			return [newBlankAgent, ...saved.map((a) => () => newLinkedAgent(a.path))]
 		}
 		if (selectedKind === 'aisandbox') {
-			return [newClaudeSandbox]
+			return aiSandboxes.map((s) => () => newAiSandbox(s.subkind))
 		}
 		return []
 	})
@@ -418,14 +422,16 @@
 			</div>
 		{:else if selectedKind === 'aisandbox'}
 			<div class="h-full overflow-auto grow min-w-0 p-2 gap-1 flex flex-col">
-				<TopLevelNode
-					label="Claude Code"
-					neutral
-					returnIcon
-					selected={aiSelected === 0}
-					onSelect={newClaudeSandbox}
-					onHover={() => (selectedByKeyboard = 0)}
-				/>
+				{#each aiSandboxes as sandbox, i (sandbox.subkind)}
+					<TopLevelNode
+						label={sandbox.label}
+						neutral
+						returnIcon
+						selected={aiSelected === i}
+						onSelect={() => newAiSandbox(sandbox.subkind)}
+						onHover={() => (selectedByKeyboard = i)}
+					/>
+				{/each}
 			</div>
 		{:else}
 			<FlowInputsQuick
diff --git a/frontend/src/lib/components/flows/pickers/FlowScriptPicker.svelte b/frontend/src/lib/components/flows/pickers/FlowScriptPicker.svelte
index 93909d13f3..0ae64f3a69 100644
--- a/frontend/src/lib/components/flows/pickers/FlowScriptPicker.svelte
+++ b/frontend/src/lib/components/flows/pickers/FlowScriptPicker.svelte
@@ -8,7 +8,7 @@
 	interface Props {
 		disabled?: boolean
 		label: string
-		lang?: SupportedLanguage | 'docker' | 'javascript' | 'claudesandbox' | undefined
+		lang?: SupportedLanguage | 'docker' | 'javascript' | 'claudesandbox' | 'pisandbox' | undefined
 		id?: string | undefined
 	}
 
diff --git a/frontend/src/lib/components/flows/pickers/FlowScriptPickerQuick.svelte b/frontend/src/lib/components/flows/pickers/FlowScriptPickerQuick.svelte
index 3ac279556f..673fce2525 100644
--- a/frontend/src/lib/components/flows/pickers/FlowScriptPickerQuick.svelte
+++ b/frontend/src/lib/components/flows/pickers/FlowScriptPickerQuick.svelte
@@ -7,7 +7,7 @@
 
 	interface Props {
 		label: string
-		lang?: SupportedLanguage | 'docker' | 'javascript' | 'claudesandbox' | undefined
+		lang?: SupportedLanguage | 'docker' | 'javascript' | 'claudesandbox' | 'pisandbox' | undefined
 		selected?: boolean
 		eeRestricted: boolean
 		enterpriseLangs?: string[]
diff --git a/frontend/src/lib/components/flows/pickers/TopLevelNode.svelte b/frontend/src/lib/components/flows/pickers/TopLevelNode.svelte
index 0c58f0fc73..a8f3e040c4 100644
--- a/frontend/src/lib/components/flows/pickers/TopLevelNode.svelte
+++ b/frontend/src/lib/components/flows/pickers/TopLevelNode.svelte
@@ -52,6 +52,7 @@
 		'AI Decision': { icon: Scale, iconClass: 'text-ai' },
 		'AI Sandbox': { icon: BotIcon, showChevron: true, iconClass: 'text-ai' },
 		'Claude Code': { icon: BotIcon, iconClass: 'text-ai' },
+		Pi: { icon: BotIcon, iconClass: 'text-ai' },
 		MCP: { icon: Plug },
 		'Web Search': { icon: Globe }
 	}
diff --git a/frontend/src/lib/components/graph/graphBuilder.svelte.ts b/frontend/src/lib/components/graph/graphBuilder.svelte.ts
index e5741137d7..98a03f8c0f 100644
--- a/frontend/src/lib/components/graph/graphBuilder.svelte.ts
+++ b/frontend/src/lib/components/graph/graphBuilder.svelte.ts
@@ -38,7 +38,7 @@ export type InsertKind =
 export type InlineScript = {
 	language: RawScript['language']
 	kind: Script['kind']
-	subkind: 'pgsql' | 'flow' | 'claudesandbox'
+	subkind: 'pgsql' | 'flow' | 'claudesandbox' | 'pisandbox'
 	summary?: string
 	instructions?: string
 }
diff --git a/frontend/src/lib/components/script_builder.ts b/frontend/src/lib/components/script_builder.ts
index 682859da69..4249441d20 100644
--- a/frontend/src/lib/components/script_builder.ts
+++ b/frontend/src/lib/components/script_builder.ts
@@ -57,6 +57,7 @@ export interface ScriptBuilderProps {
 		| 'docker'
 		| 'bunnative'
 		| 'claudesandbox'
+		| 'pisandbox'
 		| 'wac_python'
 		| 'wac_typescript'
 		| 'ci_test_bun'
diff --git a/frontend/src/lib/script_helpers.ts b/frontend/src/lib/script_helpers.ts
index 25ac64e607..b909aed43f 100644
--- a/frontend/src/lib/script_helpers.ts
+++ b/frontend/src/lib/script_helpers.ts
@@ -3,6 +3,7 @@ import { type Script } from './gen'
 import type { SupportedLanguage } from './common'
 
 import CLAUDE_SANDBOX_INIT_CODE from './templates/claude_sandbox.ts.template?raw'
+import PI_SANDBOX_INIT_CODE from './templates/pi_sandbox.ts.template?raw'
 import WAC_PYTHON_INIT_CODE from './templates/wac_python.py.template?raw'
 import WAC_TYPESCRIPT_INIT_CODE from './templates/wac_typescript.ts.template?raw'
 import CI_TEST_BUN_INIT_CODE from './templates/ci_test_bun.ts.template?raw'
@@ -1500,6 +1501,9 @@ export const INITIAL_CODE = {
 	claudesandbox: {
 		script: CLAUDE_SANDBOX_INIT_CODE
 	},
+	pisandbox: {
+		script: PI_SANDBOX_INIT_CODE
+	},
 	wac_python: {
 		script: WAC_PYTHON_INIT_CODE
 	},
@@ -1563,6 +1567,7 @@ export function initialCode(
 		| 'powershell'
 		| 'bunnative'
 		| 'claudesandbox'
+		| 'pisandbox'
 		| 'wac_python'
 		| 'wac_typescript'
 		| 'ci_test_bun'
@@ -1670,6 +1675,8 @@ export function initialCode(
 	} else if (language == 'bun' || language == 'bunnative') {
 		if (subkind === 'claudesandbox') {
 			return INITIAL_CODE.claudesandbox.script
+		} else if (subkind === 'pisandbox') {
+			return INITIAL_CODE.pisandbox.script
 		} else if (kind == 'trigger') {
 			return INITIAL_CODE.bun.trigger
 		} else if (language == 'bunnative' || subkind === 'bunnative') {
@@ -1711,6 +1718,7 @@ export function getResetCode(
 		| 'powershell'
 		| 'bunnative'
 		| 'claudesandbox'
+		| 'pisandbox'
 		| 'wac_python'
 		| 'wac_typescript'
 		| 'ci_test_bun'
diff --git a/frontend/src/lib/templates/pi_sandbox.ts.template b/frontend/src/lib/templates/pi_sandbox.ts.template
new file mode 100644
index 0000000000..ce99d549f7
--- /dev/null
+++ b/frontend/src/lib/templates/pi_sandbox.ts.template
@@ -0,0 +1,74 @@
+// sandbox
+// volume: pi .pi
+
+import { BACKGROUND_CONTEXT } from "@earendil-works/chord/context";
+import { createModels } from "@earendil-works/pi-ai/models";
+import { anthropicProvider } from "@earendil-works/pi-ai/providers/anthropic";
+import { AssistantEntry, createRegistry, Harness, watchEvents } from "@earendil-works/pi-durable";
+import { NodeExecutionEnv } from "@earendil-works/pi-durable/env/node";
+import { openNodeJsonlStorage } from "@earendil-works/pi-durable/storage/jsonl/node";
+import { CodingTools } from "@earendil-works/pi-durable/tools";
+
+export async function main(anthropic: RT.Anthropic, instructions?: string) {
+  // Any pi-ai provider works: import it from "@earendil-works/pi-ai/providers/<name>",
+  // set the API key env var it reads, and name it in `model` below.
+  process.env.ANTHROPIC_API_KEY = anthropic.apiKey;
+  const models = createModels();
+  models.setProvider(anthropicProvider());
+  const model = { provider: "anthropic", modelId: "claude-opus-5-5" };
+
+  // read, write, edit and bash, running in this job's sandbox
+  const registry = createRegistry();
+  registry.install(CodingTools);
+
+  const context = BACKGROUND_CONTEXT;
+
+  // The conversation is stored in the volume, so each run continues the previous one.
+  const harness = await Harness.open(
+    await openNodeJsonlStorage(".pi/session", context),
+    { models, registry, env: ({ cwd }) => new NodeExecutionEnv({ cwd: cwd ?? process.cwd() }) },
+    context,
+  );
+
+  try {
+    const root = await harness.root(context);
+    await root.configure({ model, instructions: instructions ?? null }, context);
+
+    const isResume = (await root.viewState(context)).value.entries.length > 0;
+
+    // you can hardcode the prompt or pass it as input.
+    const prompt = !isResume ?
+      "What is the fastest OSS workflow engine?" :
+      "What did I ask you before?"
+
+    const events = await watchEvents(harness, root.id, context);
+    events.start(async (batch) => {
+      for (const event of batch) {
+        if (event.type === "tool_execution_start") {
+          console.log(`${event.toolName} ${JSON.stringify(event.args)}`);
+        }
+      }
+    });
+
+    const submission = await root.submit({ type: "input", content: prompt }, context);
+    const settled = await submission.wait(context);
+    if (settled.status !== "done" || settled.type !== "input") {
+      throw new Error(`Pi did not answer: ${JSON.stringify(settled)}`);
+    }
+
+    const answer = await root.commit((tx) => tx.entry(AssistantEntry, settled.answer), context);
+    const response = (answer?.model?.[0]?.content ?? [])
+      .filter((b: any) => b.type === "text")
+      .map((b: any) => b.text)
+      .join("");
+
+    return {
+      is_resume: isResume,
+      prompt,
+      response,
+      usage: (await harness.usage(context)).models,
+    };
+  } finally {
+    await harness.close(context);
+  }
+}