diff --git a/frontend/src/lib/consultation-plan.ts b/frontend/src/lib/consultation-plan.ts
new file mode 100644
index 00000000..452fd5fd
--- /dev/null
+++ b/frontend/src/lib/consultation-plan.ts
@@ -0,0 +1,48 @@
+import { z } from "zod";
+
+export const consultationDomainValues = ["career", "marriage", "wealth", "timing"] as const;
+export const consultationDepthValues = ["concise", "standard", "deep", "research"] as const;
+export const consultationTimingHorizonValues = ["next_3_months", "next_12_months", "next_24_months", "long_term"] as const;
+export const consultationEvidenceCategoryValues = ["natal_foundation", "domain", "timing", "validation"] as const;
+
+export const consultationPlanSchema = z.object({
+  userIntent: z.string().trim().min(1).max(500),
+  requestedDomains: z.array(z.enum(consultationDomainValues)).min(1).max(3),
+  depth: z.enum(consultationDepthValues),
+  timingHorizon: z.enum(consultationTimingHorizonValues).nullable(),
+  requiredEvidenceCategories: z.array(z.enum(consultationEvidenceCategoryValues)).min(1).max(4),
+}).strict();
+
+export type ConsultationPlan = z.infer<typeof consultationPlanSchema>;
+export type ConsultationPlanTheme = "career" | "marriage" | "wealth" | "timing" | "general";
+
+const domainsByTheme: Record<ConsultationPlanTheme, ConsultationPlan["requestedDomains"]> = {
+  career: ["career"],
+  marriage: ["marriage"],
+  wealth: ["wealth"],
+  timing: ["timing"],
+  general: ["career", "marriage", "wealth"],
+};
+
+const evidenceByTheme: Record<ConsultationPlanTheme, ConsultationPlan["requiredEvidenceCategories"]> = {
+  career: ["natal_foundation", "domain"],
+  marriage: ["natal_foundation", "domain"],
+  wealth: ["natal_foundation", "domain"],
+  timing: ["natal_foundation", "timing", "validation"],
+  general: ["natal_foundation", "domain"],
+};
+
+export function createConsultationPlan(input: {
+  userIntent: string;
+  theme: ConsultationPlanTheme;
+  depth?: ConsultationPlan["depth"];
+  timingHorizon?: ConsultationPlan["timingHorizon"];
+}): ConsultationPlan {
+  return consultationPlanSchema.parse({
+    userIntent: input.userIntent,
+    requestedDomains: domainsByTheme[input.theme],
+    depth: input.depth ?? "standard",
+    timingHorizon: input.timingHorizon ?? (input.theme === "timing" ? "next_12_months" : null),
+    requiredEvidenceCategories: evidenceByTheme[input.theme],
+  });
+}
diff --git a/frontend/src/mastra/consultation-tools.ts b/frontend/src/mastra/consultation-tools.ts
index 9f84f6bb..7eed5cc5 100644
--- a/frontend/src/mastra/consultation-tools.ts
+++ b/frontend/src/mastra/consultation-tools.ts
@@ -2,6 +2,7 @@ import { createTool } from "@mastra/core/tools";
 import { z } from "zod";
 import { applyBirthTimeModeToWorkflowContext, type ConsultationBirthTimeMode } from "../lib/consultation-birth-time-mode.ts";
 import type { ServerChartConsultation } from "../lib/consultation-route-service.ts";
+import { createConsultationPlan } from "../lib/consultation-plan.ts";
 import type { WorkflowReceipt } from "../lib/consultation-agent-events.ts";
 import {
   consultationInputSchema,
@@ -104,6 +105,7 @@ export function createConsultationTools(ctx: ConsultationAgentContext) {
       ctx.state.consultationToolStarted = true;
       ctx.state.consultationToolCallCount += 1;
       const startedAt = Date.now();
+      const plan = createConsultationPlan({ userIntent: input.question, theme: input.theme });
       calculation = (async () => {
         try {
           await context.writer?.custom({
@@ -113,7 +115,7 @@ export function createConsultationTools(ctx: ConsultationAgentContext) {
           const toolInput = consultationInputSchema.parse({
             ...ctx.serverChart.toolInput,
             entryMode: "direct_chart",
-            question: input.question,
+            question: plan.userIntent,
             theme: input.theme,
           });
           const workflow = await (ctx.runWorkflow ?? runConsultationWorkflow)(toolInput, {
diff --git a/frontend/tests/consultation-workflow-contract.test.ts b/frontend/tests/consultation-workflow-contract.test.ts
index 93b25bc5..b68828ea 100644
--- a/frontend/tests/consultation-workflow-contract.test.ts
+++ b/frontend/tests/consultation-workflow-contract.test.ts
@@ -8,9 +8,20 @@ const mastra = readFileSync(new URL("../src/mastra/index.ts", import.meta.url),
 const tools = readFileSync(new URL("../src/mastra/consultation-tools.ts", import.meta.url), "utf8");
 const stream = readFileSync(new URL("../src/lib/stream-agent-response.ts", import.meta.url), "utf8");
 const workflow = readFileSync(new URL("../src/mastra/consultation-workflow.ts", import.meta.url), "utf8");
+const plan = readFileSync(new URL("../src/lib/consultation-plan.ts", import.meta.url), "utf8");
 const stagingCompose = readFileSync(new URL("../../deploy/docker-compose.staging.yml", import.meta.url), "utf8");
 
 
+
+test("consultation plans are server-owned and bounded", () => {
+  assert.match(plan, /consultationPlanSchema/);
+  assert.match(plan, /requestedDomains/);
+  assert.match(plan, /requiredEvidenceCategories/);
+  assert.match(plan, /createConsultationPlan/);
+  assert.match(tools, /createConsultationPlan\(\{ userIntent: input\.question, theme: input\.theme \}\)/);
+  assert.doesNotMatch(plan, /birth|latitude|longitude|engine|script/i);
+});
+
 test("uses one runtime step append entry and no scattered hard-coded step cap", () => {
   assert.match(tools, /export function appendConsultationRuntimeStep/);
   assert.doesNotMatch(tools, /steps\.length\s*>=\s*32/);