fix: escape every double-quote when embedding in Python triple-quoted strings

src/core/project/bedrockAgentImport/baseTranslator.escape.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, test } from "bun:test";
+import { escapePythonTripleQuoted } from "./baseTranslator";
+
+// escapePythonTripleQuoted escapes a value for embedding inside a Python
+// triple-double-quoted literal: SYSTEM_PROMPT = """<escaped>""". For the result
+// to be a valid literal, no double-quote in the value may abut the closing
+// delimiter — a trailing `"` (or `""`) merges with `"""` into `""""`, which
+// Python reads as a closed string plus a dangling quote (a syntax error).
+describe("escapePythonTripleQuoted", () => {
+  test("escapes a trailing double-quote so it does not merge with the closing delimiter", () => {
+    const escaped = escapePythonTripleQuoted('Always answer in "quotes"');
+    // Embedded as """<escaped>""", a trailing unescaped quote merges with the
+    // closing delimiter into """" and breaks the literal; the quote must be escaped.
+    expect(escaped).toBe('Always answer in \\"quotes\\"');
+  });
+
+  test("still escapes an interior triple-quote run", () => {
+    expect(escapePythonTripleQuoted('emit """ here')).toBe('emit \\"\\"\\" here');
+  });
+});

src/core/project/bedrockAgentImport/baseTranslator.ts

@@ -250,7 +250,11 @@ export function escapePythonString(value: string): string {
 }
 
 export function escapePythonTripleQuoted(value: string): string {
-  return value.replace(/\\/g, "\\\\").replace(/"""/g, '\\"\\"\\"');
+  // Escape every double-quote, not just """ runs. A quote left adjacent to the
+  // closing """ delimiter (a trailing " or "") merges into """" and breaks the
+  // literal; escaping each quote keeps it inside the string and also collapses
+  // any longer run safely.
+  return value.replace(/\\/g, "\\\\").replace(/"/g, '\\"');
 }
 
 function pythonParameter(name: string, parameter: ImportedFunctionParameter): string {

src/core/project/templates/renderer.test.ts

@@ -17,4 +17,13 @@ describe("HandlebarsTemplateRenderer helpers", () => {
   test("safeJson keeps double quotes for JSON-style output", () => {
     expect(renderer.render("{{safeJson v}}", { v: "a" })).toBe('"a"');
   });
+
+  // escapePyStr feeds a Python triple-double-quoted literal: """{{escapePyStr v}}""".
+  // A double-quote left adjacent to the closing """ delimiter merges into """"
+  // and breaks the literal, so every quote must be escaped.
+  test("escapePyStr escapes a trailing double-quote so it cannot merge with the closing delimiter", () => {
+    expect(renderer.render("{{escapePyStr v}}", { v: 'answer in "quotes"' })).toBe(
+      'answer in \\"quotes\\"',
+    );
+  });
 });

src/core/project/templates/renderer.ts

@@ -50,7 +50,10 @@ export class HandlebarsTemplateRenderer implements TemplateRenderer {
     );
     this.hbs.registerHelper("escapePyStr", (value: unknown) => {
       const str = typeof value === "string" ? value : "";
-      return new Handlebars.SafeString(str.replace(/\\/g, "\\\\").replace(/"""/g, '\\"\\"\\"'));
+      // Escape every double-quote, not just """ runs. A quote left adjacent to
+      // the closing """ delimiter (a trailing " or "") merges into """" and
+      // breaks the literal; escaping each quote keeps it inside the string.
+      return new Handlebars.SafeString(str.replace(/\\/g, "\\\\").replace(/"/g, '\\"'));
     });
   }