diff --git a/wasm-port/runtime/sdk/README.md b/wasm-port/runtime/sdk/README.md
index 5e1b7a8..c682432 100644
--- a/wasm-port/runtime/sdk/README.md
+++ b/wasm-port/runtime/sdk/README.md
@@ -569,6 +569,10 @@ private module paths:
   LinuxCNC-owned tool DB process port contract. Contract-only mode does not run
   `DB_PROGRAM`, does not parse `.tbl` as a fallback, and keeps execution and
   promotion disabled.
+- `runToolDbProcessPortPersistenceSession()` for running a supplied tool DB
+  process port, persisting its transcript and DB flat file through the OPFS tool
+  DB store, and returning diagnostics. The helper is browser-safe glue; runtime
+  semantics still come from the supplied port adapter.
 - `createLinuxCncToolDbNodeRuntimeAdapter()` in
   `runtime/sdk/src/tool-db-node-runtime-adapter.js` for Node/native verification
   of the real LinuxCNC `DB_PROGRAM` child process. This adapter is intentionally
diff --git a/wasm-port/runtime/sdk/src/index.js b/wasm-port/runtime/sdk/src/index.js
index 4a890ec..809702e 100644
--- a/wasm-port/runtime/sdk/src/index.js
+++ b/wasm-port/runtime/sdk/src/index.js
@@ -99,6 +99,9 @@ export {
   createToolDbTransactionPlan,
   validateToolDbTranscript,
 } from "./tool-db-process-port.js";
+export {
+  runToolDbProcessPortPersistenceSession,
+} from "./tool-db-runtime-session.js";
 
 export {
   defaultMachinePaths,
diff --git a/wasm-port/runtime/sdk/src/tool-db-node-runtime-adapter.js b/wasm-port/runtime/sdk/src/tool-db-node-runtime-adapter.js
index 4266957..2d5303c 100644
--- a/wasm-port/runtime/sdk/src/tool-db-node-runtime-adapter.js
+++ b/wasm-port/runtime/sdk/src/tool-db-node-runtime-adapter.js
@@ -1,5 +1,5 @@
 import { createWriteStream } from "node:fs";
-import { mkdir, rm } from "node:fs/promises";
+import { mkdir, readFile, rm } from "node:fs/promises";
 import { dirname, join } from "node:path";
 import { fileURLToPath } from "node:url";
 import { spawn } from "node:child_process";
@@ -156,5 +156,9 @@ export function createLinuxCncToolDbNodeRuntimeAdapter({
       stdoutFile?.end();
       stderrFile?.end();
     },
+
+    async readDbFileText() {
+      return readFile(dbSavefile, "utf8");
+    },
   };
 }
diff --git a/wasm-port/runtime/sdk/src/tool-db-runtime-session.js b/wasm-port/runtime/sdk/src/tool-db-runtime-session.js
new file mode 100644
index 0000000..cdc1bde
--- /dev/null
+++ b/wasm-port/runtime/sdk/src/tool-db-runtime-session.js
@@ -0,0 +1,78 @@
+import {
+  loadToolDbFile,
+  loadToolDbTranscript,
+  saveToolDbFile,
+  saveToolDbTranscript,
+} from "../../opfs/tool-db-store.js";
+import {
+  createToolDbProcessDiagnostics,
+  createToolDbTransactionPlan,
+  validateToolDbTranscript,
+} from "./tool-db-process-port.js";
+
+function requireString(value, label) {
+  if (typeof value !== "string" || value.length === 0) {
+    throw new Error(`${label} must be a non-empty string.`);
+  }
+  return value;
+}
+
+export async function runToolDbProcessPortPersistenceSession({
+  port,
+  machineId,
+  runId = "run-1",
+  dbProgramPath = "./db_nonran.py",
+  dbFileText,
+  storage,
+  plan = createToolDbTransactionPlan(),
+  startupToolCount = 10,
+  mutationCount = 3,
+  readDbFileText = null,
+} = {}) {
+  if (!port?.start || !port?.runTransactionPlan || !port?.exportTranscript || !port?.close) {
+    throw new Error("port must be a ToolDbProcessPort-like object.");
+  }
+  requireString(machineId, "machineId");
+  requireString(runId, "runId");
+  requireString(dbProgramPath, "dbProgramPath");
+
+  const startResult = await port.start();
+  const planResult = await port.runTransactionPlan(plan);
+  const transcript = port.exportTranscript();
+  const validation = validateToolDbTranscript(transcript);
+  const resolvedDbFileText = readDbFileText ? await readDbFileText() : (dbFileText ?? "");
+  await port.close();
+
+  const savedDb = await saveToolDbFile(machineId, resolvedDbFileText, { storage });
+  const savedTranscript = await saveToolDbTranscript(machineId, runId, transcript, { storage });
+  const loadedDb = await loadToolDbFile(machineId, { storage });
+  const loadedTranscript = await loadToolDbTranscript(machineId, runId, { storage });
+  const diagnostics = createToolDbProcessDiagnostics({
+    dbProgramPath,
+    opfsDbPath: savedDb.displayPath,
+    transcript,
+    dbFileText: loadedDb.text,
+    startupToolCount,
+    mutationCount,
+    runtimeMode: startResult.runtimeMode,
+    runtimeExecutionReady: startResult.runtimeExecutionReady === true && planResult.runtimeExecutionReady === true,
+  });
+
+  return {
+    apiName: "linuxcnc-tool-db-process-runtime-persistence-session",
+    ready: validation.ready &&
+      diagnostics.runtimeExecutionReady === true &&
+      diagnostics.opfsPersistenceReady === true &&
+      diagnostics.protocolTranscriptReady === true,
+    startResult,
+    planResult,
+    validation,
+    savedDb,
+    savedTranscript,
+    loadedDb,
+    loadedTranscript,
+    diagnostics,
+    executionEnabled: false,
+    promotionAllowed: false,
+  };
+}
diff --git a/wasm-port/tests/sdk/node/verify_sdk_surface.mjs b/wasm-port/tests/sdk/node/verify_sdk_surface.mjs
index e2afb21..8cf02cf 100644
--- a/wasm-port/tests/sdk/node/verify_sdk_surface.mjs
+++ b/wasm-port/tests/sdk/node/verify_sdk_surface.mjs
@@ -93,6 +93,7 @@ import {
   createLinuxCncToolDbProcessPort,
   createToolDbProcessDiagnostics,
   createToolDbTransactionPlan,
+  runToolDbProcessPortPersistenceSession,
   createVirtualHalBridgeActionPlan,
   createVirtualHalBridgeReadiness,
   createVirtualHalCommandScriptFixtureReport,
@@ -524,6 +525,7 @@ const requiredExports = [
   ["createLinuxCncToolDbProcessPort", createLinuxCncToolDbProcessPort],
   ["createToolDbProcessDiagnostics", createToolDbProcessDiagnostics],
   ["createToolDbTransactionPlan", createToolDbTransactionPlan],
+  ["runToolDbProcessPortPersistenceSession", runToolDbProcessPortPersistenceSession],
   ["validateToolDbTranscript", validateToolDbTranscript],
   ["saveToolDbFile", saveToolDbFile],
   ["loadToolDbFile", loadToolDbFile],
diff --git a/wasm-port/tests/sdk/node/verify_tool_db_node_runtime_adapter.mjs b/wasm-port/tests/sdk/node/verify_tool_db_node_runtime_adapter.mjs
index 9c3ee7e..203b06d 100644
--- a/wasm-port/tests/sdk/node/verify_tool_db_node_runtime_adapter.mjs
+++ b/wasm-port/tests/sdk/node/verify_tool_db_node_runtime_adapter.mjs
@@ -4,12 +4,64 @@ import { resolve } from "node:path";
 
 import {
   createLinuxCncToolDbProcessPort,
-  createToolDbProcessDiagnostics,
   validateToolDbTranscript,
 } from "../../../runtime/sdk/src/tool-db-process-port.js";
 import {
   createLinuxCncToolDbNodeRuntimeAdapter,
 } from "../../../runtime/sdk/src/tool-db-node-runtime-adapter.js";
+import {
+  runToolDbProcessPortPersistenceSession,
+} from "../../../runtime/sdk/src/tool-db-runtime-session.js";
+
+class MockFileHandle {
+  constructor(name) {
+    this.name = name;
+    this.textValue = "";
+  }
+
+  async createWritable() {
+    return {
+      write: async (text) => {
+        this.textValue = String(text);
+      },
+      close: async () => {},
+    };
+  }
+
+  async getFile() {
+    return {
+      text: async () => this.textValue,
+    };
+  }
+}
+
+class MockDirectoryHandle {
+  constructor(name = "") {
+    this.name = name;
+    this.dirs = new Map();
+    this.files = new Map();
+  }
+
+  async getDirectoryHandle(name, options = {}) {
+    if (!this.dirs.has(name)) {
+      if (!options.create) {
+        throw new Error(`missing directory: ${name}`);
+      }
+      this.dirs.set(name, new MockDirectoryHandle(name));
+    }
+    return this.dirs.get(name);
+  }
+
+  async getFileHandle(name, options = {}) {
+    if (!this.files.has(name)) {
+      if (!options.create) {
+        throw new Error(`missing file: ${name}`);
+      }
+      this.files.set(name, new MockFileHandle(name));
+    }
+    return this.files.get(name);
+  }
+}
 
 const adapter = createLinuxCncToolDbNodeRuntimeAdapter({
   dbSavefile: resolve("wasm-port/build/native/tool-db-runtime/sdk-node-runtime-adapter-db-nonran"),
@@ -59,22 +111,42 @@ const dbFileText = readFileSync(adapter.dbSavefile, "utf8");
 assert.match(dbFileText, /T11 P111 D0.33 Z0.11/);
 assert.match(dbFileText, /T14 P114\b/);
 
-const diagnostics = createToolDbProcessDiagnostics({
-  dbProgramPath: "./db_nonran.py",
-  opfsDbPath: "/machines/db-demo/tool-db/db_nonran_file",
-  transcript,
-  dbFileText,
-  startupToolCount: 10,
-  mutationCount: 3,
-  runtimeMode: adapter.runtimeMode,
-  runtimeExecutionReady: true,
+const storageRoot = new MockDirectoryHandle();
+const storage = { getDirectory: async () => storageRoot };
+const sessionAdapter = createLinuxCncToolDbNodeRuntimeAdapter({
+  dbSavefile: resolve("wasm-port/build/native/tool-db-runtime/sdk-node-runtime-persistence-db-nonran"),
+  stdoutLog: resolve("wasm-port/build/native/tool-db-runtime/sdk-node-runtime-persistence.stdout.log"),
+  stderrLog: resolve("wasm-port/build/native/tool-db-runtime/sdk-node-runtime-persistence.stderr.log"),
 });
-assert.equal(diagnostics.runtimeMode, "node-linuxcnc-db-program");
-assert.equal(diagnostics.runtimeExecutionReady, true);
-assert.equal(diagnostics.protocolTranscriptReady, true);
-assert.equal(diagnostics.opfsPersistenceReady, true);
-assert.equal(diagnostics.tblFallbackSufficient, false);
-assert.equal(diagnostics.executionEnabled, false);
-assert.equal(diagnostics.promotionAllowed, false);
+const session = await runToolDbProcessPortPersistenceSession({
+  port: createLinuxCncToolDbProcessPort({
+    dbProgramPath: "./db_nonran.py",
+    sourceFiles: [
+      "configs/sim/axis/db_demo/db_nonran.py",
+      "configs/sim/axis/db_demo/db.py",
+      "lib/python/tooldb.py",
+    ],
+    runtimeMode: sessionAdapter.runtimeMode,
+    runtimeAdapter: sessionAdapter,
+  }),
+  machineId: "db-demo",
+  runId: "node-runtime-session",
+  dbProgramPath: "./db_nonran.py",
+  readDbFileText: () => sessionAdapter.readDbFileText(),
+  storage,
+});
+assert.equal(session.apiName, "linuxcnc-tool-db-process-runtime-persistence-session");
+assert.equal(session.ready, true);
+assert.equal(session.diagnostics.runtimeMode, "node-linuxcnc-db-program");
+assert.equal(session.diagnostics.runtimeExecutionReady, true);
+assert.equal(session.diagnostics.protocolTranscriptReady, true);
+assert.equal(session.diagnostics.opfsPersistenceReady, true);
+assert.equal(session.diagnostics.tblFallbackSufficient, false);
+assert.equal(session.diagnostics.executionEnabled, false);
+assert.equal(session.diagnostics.promotionAllowed, false);
+assert.equal(session.savedDb.displayPath, "/machines/db-demo/tool-db/db_nonran_file");
+assert.equal(session.savedTranscript.displayPath, "/machines/db-demo/tool-db/transcripts/node-runtime-session/transcript.json");
+assert.match(session.loadedDb.text, /T11 P111 D0.33 Z0.11/);
+assert.match(session.loadedTranscript.payload.transcript[0].line, /^v2\.1$/);
 
 console.log("tool_db_node_runtime_adapter=ok");