diff --git a/src/index.js b/src/index.js
index 50df49c..290c4ac 100644
--- a/src/index.js
+++ b/src/index.js
@@ -65,7 +65,37 @@ export {
   renderExecutionResultsMarkdown,
   writeExecutionResultsReport,
 } from "./execution-results.js";
+export {
+  buildImportLoopProfile,
+  defaultImportLoopProfileOptions,
+  renderImportLoopProfileMarkdown,
+  validateImportLoopProfile,
+  writeImportLoopProfile,
+} from "./import-loop-profile.js";
 export { classifyIssueFinding, issueId, knownIssueCodes } from "./issues.js";
 export { inspectFixtureSet, inspectPlugin, inspectSourceText } from "./inspector.js";
 export { openClawTargetPathCandidates } from "./openclaw-target.js";
+export {
+  buildProfileDiff,
+  defaultProfileDiffOptions,
+  renderProfileDiffMarkdown,
+  validateProfileDiff,
+  writeProfileDiff,
+} from "./profile-diff.js";
+export {
+  buildRefDiff,
+  defaultRefDiffDimensions,
+  defaultRefDiffOptions,
+  renderRefDiffMarkdown,
+  validateRefDiff,
+  writeRefDiff,
+} from "./ref-diff.js";
 export { renderMarkdownReport, writeReport } from "./report.js";
+export {
+  buildRuntimeProfile,
+  defaultRuntimeProfileCommands,
+  defaultRuntimeProfileOptions,
+  renderRuntimeProfileMarkdown,
+  validateRuntimeProfile,
+  writeRuntimeProfile,
+} from "./runtime-profile.js";
diff --git a/test/api.test.js b/test/api.test.js
index 946fe61..fe69a25 100644
--- a/test/api.test.js
+++ b/test/api.test.js
@@ -9,8 +9,12 @@ import {
   buildContractCapture,
   buildExecutionResultsReport,
   buildFixtureSetColdImportReadiness,
+  buildImportLoopProfile,
   buildFixtureSetPlatformProbes,
   buildFixtureSetWorkspacePlan,
+  buildProfileDiff,
+  buildRefDiff,
+  buildRuntimeProfile,
   capturePluginEntrypoint,
   classifyIssueFinding,
   inspectFixtureSet,
@@ -27,11 +31,15 @@ import {
   renderCiSummaryMarkdown,
   renderContractCaptureMarkdown,
   renderExecutionResultsMarkdown,
+  renderImportLoopProfileMarkdown,
   renderMarkdownReport,
   renderFixtureSetColdImportReadinessMarkdown,
   renderFixtureSetIssuesReport,
   renderFixtureSetPlatformProbesMarkdown,
   renderFixtureSetWorkspacePlanMarkdown,
+  renderProfileDiffMarkdown,
+  renderRefDiffMarkdown,
+  renderRuntimeProfileMarkdown,
   runFixtureSetColdImportReadiness,
   runFixtureSetPlatformProbes,
   runFixtureSetReport,
@@ -45,6 +53,10 @@ import {
   validateColdImportReadiness,
   validateFixtureSetPlatformProbes,
   validateFixtureSetWorkspacePlan,
+  validateImportLoopProfile,
+  validateProfileDiff,
+  validateRefDiff,
+  validateRuntimeProfile,
   writeFixtureSetColdImportReadiness,
   writeFixtureSetPlatformProbes,
   writeReport,
@@ -54,6 +66,10 @@ import {
   writeCiPolicyReport,
   writeCiSummary,
   writeExecutionResultsReport,
+  writeImportLoopProfile,
+  writeProfileDiff,
+  writeRefDiff,
+  writeRuntimeProfile,
 } from "../src/index.js";
 
 test("public API runs the plugin-root check and writes reports", async () => {
@@ -401,6 +417,89 @@ test("public API exposes execution and CI rollup helpers", async () => {
   assert.equal(JSON.parse(await readFile(summaryPaths.jsonPath, "utf8")).status, "pass");
 });
 
+test("public API exposes runtime profile and diff helpers", async () => {
+  const outDir = await mkdtemp(path.join(os.tmpdir(), "plugin-inspector-profile-api-"));
+  const runtimeProfile = await buildRuntimeProfile({ runs: 1 });
+  const profileDiff = await buildProfileDiff({
+    baseline: profileFixture({ p95WallMs: 100, maxPeakRssMb: 80, nodeBootMs: 25 }),
+    current: profileFixture({ p95WallMs: 120, maxPeakRssMb: 90, nodeBootMs: 30 }),
+    policy: {
+      thresholds: {
+        wallP95RegressionPercent: 50,
+        peakRssRegressionMb: 50,
+        bootRegressionMs: 500,
+        strictMinimumSamples: 3,
+      },
+    },
+  });
+  const refDiff = await buildRefDiff({
+    baseReport: diffReport({ hookNames: ["before_tool_call"], issues: [] }),
+    headReport: diffReport({ hookNames: ["before_tool_call"], issues: [] }),
+  });
+  const importLoopProfile = {
+    generatedAt: "deterministic",
+    mode: "subprocess-cold-import-loop",
+    entrypoint: "fixtures/plugin.mjs",
+    summary: {
+      runs: 1,
+      p50WallMs: 5,
+      p95WallMs: 5,
+      maxPeakRssMb: 10,
+      maxCpuMsEstimate: 2,
+      capturedCount: 1,
+      failCount: 0,
+    },
+    samples: [
+      {
+        index: 0,
+        status: "captured",
+        capturedCount: 1,
+        wallMs: 5,
+        peakRssMb: 10,
+        cpuMsEstimate: 2,
+        exitCode: 0,
+      },
+    ],
+  };
+
+  assert.equal(typeof buildImportLoopProfile, "function");
+  const portableRuntimeProfile = {
+    ...runtimeProfile,
+    platform: { ...runtimeProfile.platform, rssSampler: "unavailable" },
+  };
+
+  assert.deepEqual(validateRuntimeProfile(portableRuntimeProfile), []);
+  assert.deepEqual(validateProfileDiff(profileDiff), []);
+  assert.deepEqual(validateRefDiff(refDiff), []);
+  assert.deepEqual(validateImportLoopProfile(importLoopProfile), []);
+  assert.match(renderRuntimeProfileMarkdown(portableRuntimeProfile), /Runtime Profile/);
+  assert.match(renderProfileDiffMarkdown(profileDiff), /Runtime Profile Diff/);
+  assert.match(renderRefDiffMarkdown(refDiff), /Ref Diff/);
+  assert.match(renderImportLoopProfileMarkdown(importLoopProfile), /Import Loop Profile/);
+
+  const runtimePaths = await writeRuntimeProfile(portableRuntimeProfile, {
+    jsonPath: path.join(outDir, "runtime.json"),
+    markdownPath: path.join(outDir, "runtime.md"),
+  });
+  const profileDiffPaths = await writeProfileDiff(profileDiff, {
+    jsonPath: path.join(outDir, "profile-diff.json"),
+    markdownPath: path.join(outDir, "profile-diff.md"),
+  });
+  const refDiffPaths = await writeRefDiff(refDiff, {
+    jsonPath: path.join(outDir, "ref-diff.json"),
+    markdownPath: path.join(outDir, "ref-diff.md"),
+  });
+  const importLoopPaths = await writeImportLoopProfile(importLoopProfile, {
+    jsonPath: path.join(outDir, "import-loop.json"),
+    markdownPath: path.join(outDir, "import-loop.md"),
+  });
+
+  assert.equal(JSON.parse(await readFile(runtimePaths.jsonPath, "utf8")).summary.commandCount, 1);
+  assert.equal(JSON.parse(await readFile(profileDiffPaths.jsonPath, "utf8")).status, "pass");
+  assert.equal(JSON.parse(await readFile(refDiffPaths.jsonPath, "utf8")).status, "pass");
+  assert.equal(JSON.parse(await readFile(importLoopPaths.jsonPath, "utf8")).summary.runs, 1);
+});
+
 test("public API honors config-driven runtime capture", async () => {
   const pluginRoot = await createPluginRoot();
   await writeFile(
@@ -413,6 +512,57 @@ test("public API honors config-driven runtime capture", async () => {
   assert.equal(result.runtimeCapture.summary.registrationCount, 1);
 });
 
+function profileFixture({ p95WallMs, maxPeakRssMb, nodeBootMs }) {
+  return {
+    runs: 3,
+    summary: { p95WallMs, maxPeakRssMb },
+    targetOpenClaw: {
+      compatRecords: 1,
+      hookNames: 1,
+      apiRegistrars: 1,
+      capturedRegistrars: 1,
+      sdkExports: 1,
+      manifestFields: 1,
+      manifestContractFields: 1,
+    },
+    fixtureInventory: {},
+    commands: [{ id: "node-boot", wallMs: { median: nodeBootMs } }],
+  };
+}
+
+function diffReport({ hookNames, issues }) {
+  return {
+    summary: {
+      fixtureCount: 1,
+      breakageCount: 0,
+      issueCount: issues.length,
+      p0IssueCount: issues.filter((issue) => issue.severity === "P0").length,
+      p1IssueCount: issues.filter((issue) => issue.severity === "P1").length,
+    },
+    targetOpenClaw: {
+      status: "available",
+      compatRecords: [],
+      hookNames,
+      apiRegistrars: ["registerTool"],
+      capturedRegistrars: ["registerTool"],
+      sdkExports: ["definePluginEntry"],
+      manifestFields: ["name"],
+      manifestContractFields: ["permissions"],
+    },
+    fixtures: [
+      {
+        id: "weather",
+        hooks: hookNames,
+        registrations: ["registerTool"],
+        sdkImports: ["definePluginEntry"],
+        pluginManifests: [{ name: "weather" }],
+        manifestContracts: ["permissions"],
+      },
+    ],
+    issues,
+  };
+}
+
 async function createPluginRoot(options = {}) {
   const rootDir = await mkdtemp(path.join(os.tmpdir(), "plugin-inspector-api-root-"));
   await mkdir(path.join(rootDir, "src"), { recursive: true });