diff --git a/ena-planner/ena-planner-runtime-utils.js b/ena-planner/ena-planner-runtime-utils.js
new file mode 100644
index 0000000..fb7b854
--- /dev/null
+++ b/ena-planner/ena-planner-runtime-utils.js
@@ -0,0 +1,64 @@
+export function extractLastNPlots(chat, n) {
+    if (!Array.isArray(chat) || chat.length === 0) return [];
+    const want = Math.max(0, Number(n) || 0);
+    if (!want) return [];
+
+    const plots = [];
+    const plotRe = /<plot\b[^>]*>[\s\S]*?<\/plot>/gi;
+
+    for (let i = chat.length - 1; i >= 0; i--) {
+        const text = chat[i]?.mes ?? '';
+        if (!text) continue;
+        const matches = [...text.matchAll(plotRe)];
+        for (let j = matches.length - 1; j >= 0; j--) {
+            plots.push(matches[j][0]);
+            if (plots.length >= want) return plots;
+        }
+    }
+    return plots;
+}
+
+export function formatPlotsBlock(plotList) {
+    if (!Array.isArray(plotList) || plotList.length === 0) return '';
+    const chrono = [...plotList].reverse();
+    const lines = [];
+    chrono.forEach((p, idx) => {
+        lines.push(`【plot -${chrono.length - idx}】\n${p}`);
+    });
+    return `<previous_plots>\n${lines.join('\n\n')}\n</previous_plots>`;
+}
+
+export function applyPlannerResultAndSend({
+    textarea,
+    button,
+    rawUserInput = '',
+    filtered = '',
+    plannerRecall = null,
+    runtime = null,
+    plannerState = null,
+} = {}) {
+    if (!textarea || !button) return { applied: false, reason: 'missing-target' };
+
+    const raw = String(rawUserInput ?? '').trim();
+    const merged = `${raw}\n\n${String(filtered ?? '')}`.trim();
+    textarea.value = merged;
+    if (plannerState && typeof plannerState === 'object') {
+        plannerState.lastInjectedText = merged;
+    }
+
+    let handoffPrepared = false;
+    if (runtime?.preparePlannerRecallHandoff && plannerRecall?.result) {
+        runtime.preparePlannerRecallHandoff({
+            rawUserInput: raw,
+            plannerAugmentedMessage: merged,
+            plannerRecall,
+        });
+        handoffPrepared = true;
+    }
+
+    if (plannerState && typeof plannerState === 'object') {
+        plannerState.bypassNextSend = true;
+    }
+    button.click();
+    return { applied: true, merged, handoffPrepared };
+}
diff --git a/ena-planner/ena-planner.js b/ena-planner/ena-planner.js
index 92ef842..dbff20f 100644
--- a/ena-planner/ena-planner.js
+++ b/ena-planner/ena-planner.js
@@ -1,6 +1,11 @@
 import { extension_settings } from '../../../../extensions.js';
 import { getRequestHeaders, saveSettingsDebounced, substituteParamsExtended } from '../../../../../script.js';
 import { EnaPlannerStorage, migrateFromLWBIfNeeded } from './ena-planner-storage.js';
+import {
+    applyPlannerResultAndSend,
+    extractLastNPlots,
+    formatPlotsBlock,
+} from './ena-planner-runtime-utils.js';
 import { DEFAULT_PROMPT_BLOCKS, BUILTIN_TEMPLATES } from './ena-planner-presets.js';
 import {
     createBuiltinPromptBlock,
@@ -794,38 +799,6 @@ function collectRecentChatSnippet(chat, maxMessages) {
  * Plot extraction
  * --------------------------
  */
-function extractLastNPlots(chat, n) {
-    if (!Array.isArray(chat) || chat.length === 0) return [];
-    const want = Math.max(0, Number(n) || 0);
-    if (!want) return [];
-
-    const plots = [];
-    const plotRe = /<plot\b[^>]*>[\s\S]*?<\/plot>/gi;
-
-    for (let i = chat.length - 1; i >= 0; i--) {
-        const text = chat[i]?.mes ?? '';
-        if (!text) continue;
-        const matches = [...text.matchAll(plotRe)];
-        for (let j = matches.length - 1; j >= 0; j--) {
-            plots.push(matches[j][0]);
-            if (plots.length >= want) return plots;
-        }
-    }
-    return plots;
-}
-
-function formatPlotsBlock(plotList) {
-    if (!Array.isArray(plotList) || plotList.length === 0) return '';
-    // plotList is [newest, ..., oldest] from extractLastNPlots
-    // Reverse to chronological: oldest first, newest last
-    const chrono = [...plotList].reverse();
-    const lines = [];
-    chrono.forEach((p, idx) => {
-        lines.push(`【plot -${chrono.length - idx}】\n${p}`);
-    });
-    return `<previous_plots>\n${lines.join('\n\n')}\n</previous_plots>`;
-}
-
 /**
  * -------------------------
  * Worldbook — read via ST API (like idle-watcher)
@@ -1941,22 +1914,18 @@ async function doInterceptAndPlanThenSend() {
                 ta.value = `${raw}\n\n${preview}`.trim();
             }
         });
-        const merged = `${raw}\n\n${filtered}`.trim();
-        ta.value = merged;
-        state.lastInjectedText = merged;
-
-        // Ordering requirement: register the one-shot planner recall handoff
-        // synchronously before btn.click(), with no await/timer hop in between.
-        if (_bmeRuntime?.preparePlannerRecallHandoff && plannerRecall?.result) {
-            _bmeRuntime.preparePlannerRecallHandoff({
-                rawUserInput: raw,
-                plannerAugmentedMessage: merged,
-                plannerRecall,
-            });
-        }
-
-        state.bypassNextSend = true;
-        btn.click();
+        // Ordering requirement: write the merged textarea, register the
+        // one-shot planner recall handoff synchronously, then click send with
+        // no await/timer hop in between.
+        applyPlannerResultAndSend({
+            textarea: ta,
+            button: btn,
+            rawUserInput: raw,
+            filtered,
+            plannerRecall,
+            runtime: _bmeRuntime,
+            plannerState: state,
+        });
     } catch (err) {
         ta.value = raw;
         state.lastInjectedText = '';
diff --git a/tests/ena-planner-plots.mjs b/tests/ena-planner-plots.mjs
new file mode 100644
index 0000000..67abe4c
--- /dev/null
+++ b/tests/ena-planner-plots.mjs
@@ -0,0 +1,78 @@
+import assert from 'node:assert/strict';
+
+import {
+  applyPlannerResultAndSend,
+  extractLastNPlots,
+  formatPlotsBlock,
+} from '../ena-planner/ena-planner-runtime-utils.js';
+
+{
+  const chat = [
+    { mes: 'no plot here' },
+    { mes: '<plot>old one</plot>\n<plot>old two</plot>' },
+    { mes: 'assistant says <plot>new one</plot>' },
+  ];
+  assert.deepEqual(extractLastNPlots(chat, 2), [
+    '<plot>new one</plot>',
+    '<plot>old two</plot>',
+  ]);
+  assert.deepEqual(extractLastNPlots(chat, 0), []);
+  assert.deepEqual(extractLastNPlots(null, 3), []);
+}
+
+{
+  const block = formatPlotsBlock([
+    '<plot>newest</plot>',
+    '<plot>older</plot>',
+  ]);
+  assert.equal(
+    block,
+    '<previous_plots>\n【plot -2】\n<plot>older</plot>\n\n【plot -1】\n<plot>newest</plot>\n</previous_plots>',
+  );
+  assert.equal(formatPlotsBlock([]), '');
+}
+
+{
+  const order = [];
+  const textarea = { value: 'raw' };
+  const button = { click: () => order.push('click') };
+  const plannerState = { bypassNextSend: false, lastInjectedText: '' };
+  const plannerRecall = { result: { selected: ['memory-a'] } };
+  const runtime = {
+    preparePlannerRecallHandoff(payload) {
+      order.push('handoff');
+      assert.equal(payload.rawUserInput, 'raw input');
+      assert.equal(payload.plannerAugmentedMessage, 'raw input\n\n<plot>next</plot>');
+      assert.equal(payload.plannerRecall, plannerRecall);
+    },
+  };
+
+  const result = applyPlannerResultAndSend({
+    textarea,
+    button,
+    rawUserInput: 'raw input',
+    filtered: '<plot>next</plot>',
+    plannerRecall,
+    runtime,
+    plannerState,
+  });
+
+  assert.deepEqual(order, ['handoff', 'click']);
+  assert.equal(result.applied, true);
+  assert.equal(result.handoffPrepared, true);
+  assert.equal(textarea.value, 'raw input\n\n<plot>next</plot>');
+  assert.equal(plannerState.lastInjectedText, textarea.value);
+  assert.equal(plannerState.bypassNextSend, true);
+}
+
+{
+  const order = [];
+  const result = applyPlannerResultAndSend({
+    textarea: null,
+    button: { click: () => order.push('click') },
+  });
+  assert.deepEqual(result, { applied: false, reason: 'missing-target' });
+  assert.deepEqual(order, []);
+}
+
+console.log('ena-planner-plots tests passed');