diff --git a/packages/cli/src/core/resources/function/config.ts b/packages/cli/src/core/resources/function/config.ts
index 162336ff..e0b52be2 100644
--- a/packages/cli/src/core/resources/function/config.ts
+++ b/packages/cli/src/core/resources/function/config.ts
@@ -1,4 +1,4 @@
-import { basename, dirname, join, relative } from "node:path";
+import { basename, dirname, join, relative, resolve } from "node:path";
 import { globby } from "globby";
 import {
   ENTRY_FILE_GLOB,
@@ -10,6 +10,7 @@ import {
   InvalidInputError,
   SchemaValidationError,
 } from "@/core/errors.js";
+import { collectReachableBackendFiles } from "@/core/resources/function/reachability.js";
 import type {
   BackendFunction,
   FunctionConfig,
@@ -32,7 +33,10 @@ async function readFunctionConfig(configPath: string): Promise<FunctionConfig> {
   return result.data;
 }
 
-async function readFunction(configPath: string): Promise<BackendFunction> {
+async function readFunction(
+  configPath: string,
+  backendRoot: string,
+): Promise<BackendFunction> {
   const config = await readFunctionConfig(configPath);
   const functionDir = dirname(configPath);
   const entryPath = join(functionDir, config.entry);
@@ -51,10 +55,17 @@ async function readFunction(configPath: string): Promise<BackendFunction> {
     absolute: true,
   });
 
+  const extraFiles = await collectReachableBackendFiles(
+    entryPath,
+    filePaths,
+    backendRoot,
+  );
+  const allFilePaths = [...new Set([...filePaths, ...extraFiles])];
+
   const functionData: BackendFunction = {
     ...config,
     entryPath,
-    filePaths,
+    filePaths: allFilePaths,
     source: { type: "project" },
   };
   return functionData;
@@ -84,8 +95,10 @@ export async function readAllFunctions(
     (entryFile) => !configFilesDirs.has(dirname(entryFile)),
   );
 
+  const backendRoot = resolve(functionsDir, "..");
+
   const functionsFromConfig = await Promise.all(
-    configFiles.map((configPath) => readFunction(configPath)),
+    configFiles.map((configPath) => readFunction(configPath, backendRoot)),
   );
 
   const functionsWithoutConfig = await Promise.all(
@@ -96,6 +109,13 @@ export async function readAllFunctions(
         absolute: true,
       });
 
+      const extraFiles = await collectReachableBackendFiles(
+        entryFile,
+        filePaths,
+        backendRoot,
+      );
+      const allFilePaths = [...new Set([...filePaths, ...extraFiles])];
+
       const name = relative(functionsDir, functionDir).split(/[/\\]/).join("/");
       if (!name) {
         throw new InvalidInputError(
@@ -115,7 +135,7 @@ export async function readAllFunctions(
         name,
         entry,
         entryPath: entryFile,
-        filePaths,
+        filePaths: allFilePaths,
         source: { type: "project" },
       };
       return functionData;
diff --git a/packages/cli/src/core/resources/function/reachability.ts b/packages/cli/src/core/resources/function/reachability.ts
new file mode 100644
index 00000000..cbe3ced9
--- /dev/null
+++ b/packages/cli/src/core/resources/function/reachability.ts
@@ -0,0 +1,85 @@
+import { dirname, extname, relative, resolve } from "node:path";
+import { pathExists, readTextFile } from "@/core/utils/fs.js";
+
+// Matches relative specifiers in static/dynamic imports, exports, and require calls.
+const RELATIVE_IMPORT_RE =
+  /(?:from|import|require)\s*\(?['"`](\.\.?\/[^'"`\s]+)['"`]/g;
+
+async function resolveSpecifier(
+  specifier: string,
+  fromDir: string,
+): Promise<string | null> {
+  const base = resolve(fromDir, specifier);
+  const ext = extname(base);
+
+  if (ext) {
+    // TypeScript projects import .js but ship .ts — try the swap first.
+    if (ext === ".js") {
+      const asTts = `${base.slice(0, -3)}.ts`;
+      if (await pathExists(asTts)) return asTts;
+    }
+    if (await pathExists(base)) return base;
+    return null;
+  }
+
+  // No extension — try common TypeScript/JS extensions.
+  for (const candidate of [
+    `${base}.ts`,
+    `${base}.js`,
+    `${base}.json`,
+    resolve(base, "index.ts"),
+    resolve(base, "index.js"),
+  ]) {
+    if (await pathExists(candidate)) return candidate;
+  }
+
+  return null;
+}
+
+/**
+ * Walk the import graph starting from `functionFilePaths` and return any
+ * additional files reachable via relative imports that live inside
+ * `backendRoot` but outside the original function directory.
+ */
+export async function collectReachableBackendFiles(
+  _entryPath: string,
+  functionFilePaths: string[],
+  backendRoot: string,
+): Promise<string[]> {
+  const visited = new Set<string>(functionFilePaths);
+  const queue: string[] = [...functionFilePaths];
+  const extra: string[] = [];
+
+  while (queue.length > 0) {
+    const filePath = queue.shift()!;
+
+    let content: string;
+    try {
+      content = await readTextFile(filePath);
+    } catch {
+      continue;
+    }
+
+    const dir = dirname(filePath);
+
+    for (const match of content.matchAll(RELATIVE_IMPORT_RE)) {
+      const specifier = match[1];
+
+      const resolved = await resolveSpecifier(specifier, dir);
+      if (!resolved) continue;
+
+      // Only follow imports that stay inside backendRoot.
+      const rel = relative(backendRoot, resolved);
+      if (rel.startsWith("..")) continue;
+
+      if (!visited.has(resolved)) {
+        visited.add(resolved);
+        queue.push(resolved);
+        extra.push(resolved);
+      }
+    }
+  }
+
+  const functionSet = new Set(functionFilePaths);
+  return extra.filter((p) => !functionSet.has(p));
+}
diff --git a/packages/cli/tests/core/function-config.spec.ts b/packages/cli/tests/core/function-config.spec.ts
index 6a06ae2e..8d96ae1b 100644
--- a/packages/cli/tests/core/function-config.spec.ts
+++ b/packages/cli/tests/core/function-config.spec.ts
@@ -96,4 +96,45 @@ describe("readAllFunctions", () => {
       /Duplicate function name "same-name"/,
     );
   });
+
+  it("includes shared files reachable via parent-escape relative imports", async () => {
+    const functionsDir = resolve(
+      FIXTURES_DIR,
+      "function-shared-imports/base44/functions",
+    );
+    const result = await readAllFunctions(functionsDir);
+
+    expect(result).toHaveLength(2);
+
+    for (const fn of result) {
+      const hasShared = fn.filePaths.some((p) =>
+        fwd(p).endsWith("shared/response.ts"),
+      );
+      expect(hasShared, `${fn.name} should include shared/response.ts`).toBe(
+        true,
+      );
+    }
+  });
+
+  it("shared file path stays outside functions dir (correct relative path for deploy)", async () => {
+    const functionsDir = resolve(
+      FIXTURES_DIR,
+      "function-shared-imports/base44/functions",
+    );
+    const result = await readAllFunctions(functionsDir);
+    const greet = result.find((f) => f.name === "greet");
+    expect(greet).toBeDefined();
+
+    const sharedPath = greet!.filePaths.find((p) =>
+      fwd(p).endsWith("shared/response.ts"),
+    );
+    expect(sharedPath).toBeDefined();
+
+    // deploy.ts uses relative(functionDir, filePath) — verify the expected relative path
+    const { dirname: pathDirname, relative: pathRelative } = await import(
+      "node:path"
+    );
+    const rel = fwd(pathRelative(pathDirname(greet!.entryPath), sharedPath!));
+    expect(rel).toBe("../../shared/response.ts");
+  });
 });
diff --git a/packages/cli/tests/fixtures/function-shared-imports/base44/functions/farewell/entry.ts b/packages/cli/tests/fixtures/function-shared-imports/base44/functions/farewell/entry.ts
new file mode 100644
index 00000000..c0b8c020
--- /dev/null
+++ b/packages/cli/tests/fixtures/function-shared-imports/base44/functions/farewell/entry.ts
@@ -0,0 +1,6 @@
+import { ok } from "../../shared/response.ts";
+
+Deno.serve(async (req: Request) => {
+  const { name } = await req.json();
+  return ok(`Goodbye, ${name}!`);
+});
diff --git a/packages/cli/tests/fixtures/function-shared-imports/base44/functions/greet/entry.ts b/packages/cli/tests/fixtures/function-shared-imports/base44/functions/greet/entry.ts
new file mode 100644
index 00000000..10099e17
--- /dev/null
+++ b/packages/cli/tests/fixtures/function-shared-imports/base44/functions/greet/entry.ts
@@ -0,0 +1,6 @@
+import { ok } from "../../shared/response.ts";
+
+Deno.serve(async (req: Request) => {
+  const { name } = await req.json();
+  return ok(`Hello, ${name}!`);
+});
diff --git a/packages/cli/tests/fixtures/function-shared-imports/base44/shared/response.ts b/packages/cli/tests/fixtures/function-shared-imports/base44/shared/response.ts
new file mode 100644
index 00000000..9061f562
--- /dev/null
+++ b/packages/cli/tests/fixtures/function-shared-imports/base44/shared/response.ts
@@ -0,0 +1,2 @@
+export const ok = (data: unknown) => new Response(JSON.stringify({ ok: true, data }));
+export const err = (msg: string) => new Response(JSON.stringify({ ok: false, error: msg }), { status: 500 });