diff --git a/packages/coding-agent/docs/rlm-runtime.md b/packages/coding-agent/docs/rlm-runtime.md
index 4de095cf01..a3ceaf35dd 100644
--- a/packages/coding-agent/docs/rlm-runtime.md
+++ b/packages/coding-agent/docs/rlm-runtime.md
@@ -76,7 +76,7 @@ The Python side does not call providers or implement an agent loop.
 The kernel is created lazily on first IPython use. Python resolution is:
 
 1. `PRIME_AGENT_KERNEL_PYTHON`, when it can import `ipykernel`;
-2. `~/.prime/agent/kernel-venv/bin/python`, bootstrapped with `uv`; or
+2. `~/.prime/agent/kernel-venv/bin/python` (`Scripts\python.exe` on Windows), bootstrapped with `uv`; or
 3. the XDG data location when `~/.prime` is not writable.
 
 The managed environment includes Python 3.11, `ipykernel`, and `prime-agent-runtime`. A bootstrap marker detects stale environments.
diff --git a/packages/coding-agent/src/core/kernel/bootstrap.ts b/packages/coding-agent/src/core/kernel/bootstrap.ts
index 9b12b4b413..79ffc0e250 100644
--- a/packages/coding-agent/src/core/kernel/bootstrap.ts
+++ b/packages/coding-agent/src/core/kernel/bootstrap.ts
@@ -119,6 +119,10 @@ function expandHome(filePath: string): string {
 	return filePath;
 }
 
+export function venvPython(venv: string): string {
+	return process.platform === "win32" ? path.join(venv, "Scripts", "python.exe") : path.join(venv, "bin", "python");
+}
+
 function fileContentHash(filePath: string): string {
 	try {
 		return `sha256:${createHash("sha256").update(readFileSync(filePath)).digest("hex")}`;
@@ -725,7 +729,7 @@ async function bootstrapVenv(
 ): Promise<void> {
 	await mkdir(path.dirname(venv), { recursive: true });
 	const uv = await ensureUv(options);
-	const python = path.join(venv, "bin", "python");
+	const python = venvPython(venv);
 	const sourceDir = await resolveRuntimeSourceDir();
 	const runtimeRequirement = sourceDir ?? RUNTIME_REQUIREMENT;
 	const runtimeIdentity = await resolveRuntimeIdentity();
@@ -886,7 +890,7 @@ async function ensureKernelPythonUncached(
 	}
 
 	const venv = await resolveWritableKernelVenvDir();
-	const python = path.join(venv, "bin", "python");
+	const python = venvPython(venv);
 	const runtimeIdentity = await resolveRuntimeIdentity();
 	if (await kernelReady(python, venv, runtimeIdentity, pythonSkills)) return python;
 
diff --git a/packages/coding-agent/test/ipython-bootstrap.test.ts b/packages/coding-agent/test/ipython-bootstrap.test.ts
index 8aba99b463..fa5c23ba20 100644
--- a/packages/coding-agent/test/ipython-bootstrap.test.ts
+++ b/packages/coding-agent/test/ipython-bootstrap.test.ts
@@ -3,6 +3,7 @@ import { existsSync, mkdirSync, mkdtempSync, realpathSync, rmSync, writeFileSync
 import { homedir, tmpdir } from "node:os";
 import { join } from "node:path";
 import { afterAll, describe, expect, it } from "vitest";
+import { venvPython } from "../src/core/kernel/bootstrap.js";
 import { KernelManager } from "../src/core/kernel/index.js";
 import { buildRlmBootstrapCode } from "../src/core/tools/ipython.js";
 
@@ -44,7 +45,7 @@ describe("IPython RLM bootstrap", () => {
 function resolveKernelPython(): string | null {
 	const candidates = [
 		process.env.PRIME_AGENT_KERNEL_PYTHON,
-		join(homedir(), ".prime", "agent", "kernel-venv", "bin", "python"),
+		venvPython(join(homedir(), ".prime", "agent", "kernel-venv")),
 	].filter((p): p is string => Boolean(p));
 	for (const python of candidates) {
 		if (!existsSync(python)) continue;
diff --git a/packages/coding-agent/test/kernel-bootstrap.test.ts b/packages/coding-agent/test/kernel-bootstrap.test.ts
index eeb2fc0d15..bed16ba120 100644
--- a/packages/coding-agent/test/kernel-bootstrap.test.ts
+++ b/packages/coding-agent/test/kernel-bootstrap.test.ts
@@ -10,6 +10,7 @@ import {
 	getKernelVenvDir,
 	type KernelPythonSkill,
 	resolveRuntimeIdentity,
+	venvPython,
 } from "../src/core/kernel/bootstrap.js";
 
 let tempDir = "";
@@ -174,6 +175,21 @@ describe("kernel bootstrap", () => {
 		expect(getKernelVenvDir()).toBe(venv);
 	});
 
+	it("resolves the venv interpreter using the host platform layout", () => {
+		const originalPlatform = process.platform;
+		const setPlatform = (value: NodeJS.Platform) =>
+			Object.defineProperty(process, "platform", { value, configurable: true });
+		try {
+			setPlatform("win32");
+			expect(venvPython("C:\\venv")).toBe(join("C:\\venv", "Scripts", "python.exe"));
+
+			setPlatform("linux");
+			expect(venvPython("/venv")).toBe(join("/venv", "bin", "python"));
+		} finally {
+			setPlatform(originalPlatform);
+		}
+	});
+
 	it("bootstraps a missing venv with uv, ipykernel, prime-agent-runtime, and default extra packages", async () => {
 		const logPath = installFakeUv();
 		const venv = join(tempDir, "kernel-venv");
diff --git a/packages/coding-agent/test/kernel-state-roundtrip.test.ts b/packages/coding-agent/test/kernel-state-roundtrip.test.ts
index e79d88d927..4b2b23522d 100644
--- a/packages/coding-agent/test/kernel-state-roundtrip.test.ts
+++ b/packages/coding-agent/test/kernel-state-roundtrip.test.ts
@@ -3,13 +3,14 @@ import { existsSync, mkdtempSync, rmSync } from "node:fs";
 import { homedir, tmpdir } from "node:os";
 import { join } from "node:path";
 import { afterAll, beforeAll, describe, expect, it } from "vitest";
+import { venvPython } from "../src/core/kernel/bootstrap.js";
 import { KernelManager } from "../src/core/kernel/index.js";
 
 /** Find a python that can launch an ipykernel and has dill, or null to skip. */
 function resolveKernelPython(): string | null {
 	const candidates = [
 		process.env.PRIME_AGENT_KERNEL_PYTHON,
-		join(homedir(), ".prime", "agent", "kernel-venv", "bin", "python"),
+		venvPython(join(homedir(), ".prime", "agent", "kernel-venv")),
 	].filter((p): p is string => Boolean(p));
 	for (const python of candidates) {
 		if (!existsSync(python)) continue;