diff --git a/checkpoint.json b/checkpoint.json
new file mode 100644
index 000000000..25e78e7b8
--- /dev/null
+++ b/checkpoint.json
@@ -0,0 +1,62 @@
+{
+  "timestamp": "2026-03-25T19:33:57.369267Z",
+  "current_node": "main",
+  "completed_nodes": [
+    "start",
+    "main"
+  ],
+  "node_retries": {
+    "start": 1,
+    "main": 1
+  },
+  "context_values": {
+    "internal.thread_id": "start",
+    "internal.retry_count.main": 1,
+    "failure_signature": "",
+    "graph.rankdir": "LR",
+    "outcome": "success",
+    "internal.node_visit_count": 1,
+    "failure_class": "",
+    "last_response": "All 7 steps completed. Here's the summary:\n\n---\n\n## Results Summary\n\n| # | Command | Status |\n|---|---------|--------|\n| 1 | `rustc --version && cargo --version` | ✅ Pass — `rustc 1.94.0`, `cargo ",
+    "internal.fidelity": "compact",
+    "current_node": "main",
+    "internal.retry_count.start": 1,
+    "response.main": "All 7 steps completed. Here's the summary:\n\n---\n\n## Results Summary\n\n| # | Command | Status |\n|---|---------|--------|\n| 1 | `rustc --version && cargo --version` | ✅ Pass — `rustc 1.94.0`, `cargo 1.94.0` |\n| 2 | `bun --version` | ✅ Pass — `1.3.10` |\n| 3 | `cargo fmt --check --all` | ✅ Pass — no formatting issues |\n| 4 | `cargo clippy -q --workspace -- -D warnings` | ✅ Pass — no lint warnings |\n| 5 | `cargo nextest run --cargo-quiet --workspace --status-level fail` | ✅ Pass — **3,475 tests passed**, 178 skipped, 0 failed |\n| 6 | `cd apps/fabro-web && bun install && bun run typecheck` | ✅ Pass — 1,400 packages installed, TypeScript types valid |\n| 7 | `cd apps/fabro-web && bun test` | ✅ Pass — **15 tests passed**, 0 failed across 3 files |\n\n**All 7 steps passed.** The sandbox is fully functional for linting and testing the project. 🎉",
+    "thread.start.current_node": "main",
+    "last_stage": "main",
+    "graph.goal": "Verify the sandbox can lint and test the project",
+    "internal.run_id": "01KMK7HVZTYDDAM65VHMWNE0D1",
+    "current.preamble": "Goal: Verify the sandbox can lint and test the project\n"
+  },
+  "logs": [],
+  "node_outcomes": {
+    "start": {
+      "status": "success",
+      "duration_ms": 0
+    },
+    "main": {
+      "status": "success",
+      "context_updates": {
+        "response.main": "All 7 steps completed. Here's the summary:\n\n---\n\n## Results Summary\n\n| # | Command | Status |\n|---|---------|--------|\n| 1 | `rustc --version && cargo --version` | ✅ Pass — `rustc 1.94.0`, `cargo 1.94.0` |\n| 2 | `bun --version` | ✅ Pass — `1.3.10` |\n| 3 | `cargo fmt --check --all` | ✅ Pass — no formatting issues |\n| 4 | `cargo clippy -q --workspace -- -D warnings` | ✅ Pass — no lint warnings |\n| 5 | `cargo nextest run --cargo-quiet --workspace --status-level fail` | ✅ Pass — **3,475 tests passed**, 178 skipped, 0 failed |\n| 6 | `cd apps/fabro-web && bun install && bun run typecheck` | ✅ Pass — 1,400 packages installed, TypeScript types valid |\n| 7 | `cd apps/fabro-web && bun test` | ✅ Pass — **15 tests passed**, 0 failed across 3 files |\n\n**All 7 steps passed.** The sandbox is fully functional for linting and testing the project. 🎉",
+        "last_response": "All 7 steps completed. Here's the summary:\n\n---\n\n## Results Summary\n\n| # | Command | Status |\n|---|---------|--------|\n| 1 | `rustc --version && cargo --version` | ✅ Pass — `rustc 1.94.0`, `cargo ",
+        "last_stage": "main"
+      },
+      "notes": "Stage completed: main",
+      "usage": {
+        "model": "claude-sonnet-4-6",
+        "input_tokens": 2367,
+        "output_tokens": 1067,
+        "cache_read_tokens": 33552,
+        "cache_write_tokens": 6670,
+        "reasoning_tokens": 16,
+        "cost": 0.023105999999999998
+      },
+      "duration_ms": 275553
+    }
+  },
+  "next_node_id": "exit",
+  "node_visits": {
+    "start": 1,
+    "main": 1
+  }
+}
\ No newline at end of file
diff --git a/nodes/main/prompt.md b/nodes/main/prompt.md
new file mode 100644
index 000000000..c2f632b7f
--- /dev/null
+++ b/nodes/main/prompt.md
@@ -0,0 +1,14 @@
+Goal: Verify the sandbox can lint and test the project
+
+
+Run each of these commands in order and report the results. If any command fails, continue running the rest and report all results at the end.
+
+1. rustc --version && cargo --version
+2. bun --version
+3. cargo fmt --check --all
+4. cargo clippy -q --workspace -- -D warnings
+5. cargo nextest run --cargo-quiet --workspace --status-level fail
+6. cd apps/fabro-web && bun install && bun run typecheck
+7. cd apps/fabro-web && bun test
+
+Report a summary table of pass/fail for each step.
\ No newline at end of file
diff --git a/nodes/main/provider_used.json b/nodes/main/provider_used.json
new file mode 100644
index 000000000..d0418b4c6
--- /dev/null
+++ b/nodes/main/provider_used.json
@@ -0,0 +1,5 @@
+{
+  "mode": "agent",
+  "provider": "anthropic",
+  "model": "claude-sonnet-4-6"
+}
\ No newline at end of file
diff --git a/nodes/main/response.md b/nodes/main/response.md
new file mode 100644
index 000000000..78eb67b17
--- /dev/null
+++ b/nodes/main/response.md
@@ -0,0 +1,17 @@
+All 7 steps completed. Here's the summary:
+
+---
+
+## Results Summary
+
+| # | Command | Status |
+|---|---------|--------|
+| 1 | `rustc --version && cargo --version` | ✅ Pass — `rustc 1.94.0`, `cargo 1.94.0` |
+| 2 | `bun --version` | ✅ Pass — `1.3.10` |
+| 3 | `cargo fmt --check --all` | ✅ Pass — no formatting issues |
+| 4 | `cargo clippy -q --workspace -- -D warnings` | ✅ Pass — no lint warnings |
+| 5 | `cargo nextest run --cargo-quiet --workspace --status-level fail` | ✅ Pass — **3,475 tests passed**, 178 skipped, 0 failed |
+| 6 | `cd apps/fabro-web && bun install && bun run typecheck` | ✅ Pass — 1,400 packages installed, TypeScript types valid |
+| 7 | `cd apps/fabro-web && bun test` | ✅ Pass — **15 tests passed**, 0 failed across 3 files |
+
+**All 7 steps passed.** The sandbox is fully functional for linting and testing the project. 🎉
\ No newline at end of file
diff --git a/nodes/main/status.json b/nodes/main/status.json
new file mode 100644
index 000000000..46f63d3ff
--- /dev/null
+++ b/nodes/main/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "notes": "Stage completed: main",
+  "failure_reason": null,
+  "timestamp": "2026-03-25T19:33:57.366387+00:00"
+}
\ No newline at end of file
diff --git a/nodes/start/status.json b/nodes/start/status.json
new file mode 100644
index 000000000..153780a82
--- /dev/null
+++ b/nodes/start/status.json
@@ -0,0 +1,6 @@
+{
+  "status": "success",
+  "notes": null,
+  "failure_reason": null,
+  "timestamp": "2026-03-25T19:29:21.811259+00:00"
+}
\ No newline at end of file