From b057f1c24505e167523a5aa499cd80e21af66bea Mon Sep 17 00:00:00 2001
From: George Pickett <george@parallel.ai>
Date: Fri, 4 Sep 2026 14:55:19 -0700
Subject: [PATCH] Fix fact checker service errors and update Parallel APIs

---
 .../parallel-fact-checker-cerebras/README.md  |   31 +-
 .../package-lock.json                         | 1123 ++++++++++++++++-
 .../package.json                              |    7 +-
 .../worker.test.ts                            |  132 ++
 .../parallel-fact-checker-cerebras/worker.ts  |  100 +-
 5 files changed, 1321 insertions(+), 72 deletions(-)
 create mode 100644 typescript-recipes/parallel-fact-checker-cerebras/worker.test.ts

diff --git a/typescript-recipes/parallel-fact-checker-cerebras/README.md b/typescript-recipes/parallel-fact-checker-cerebras/README.md
index f27251d..7f14980 100644
--- a/typescript-recipes/parallel-fact-checker-cerebras/README.md
+++ b/typescript-recipes/parallel-fact-checker-cerebras/README.md
@@ -96,7 +96,7 @@ RULES:
     });
 
     // Stream facts as they're extracted
-    for await (const chunk of factsResult.textStream) {
+    for await (const chunk of modelText(factsResult)) {
       // Parse complete FACT: lines and emit them immediately
       // ...
     }
@@ -123,12 +123,14 @@ async function verifyFact(
 ): Promise<void> {
   try {
     // Search for evidence using Parallel
-    const searchResult = await parallel.beta.search({
+    const searchResult = await parallel.search({
       objective: `Find reliable sources to verify or refute this claim: "${fact.text}"`,
       search_queries: [fact.text],
-      processor: "base",
-      max_results: 5,
-      max_chars_per_result: 2000,
+      mode: "basic",
+      advanced_settings: {
+        max_results: 5,
+        excerpt_settings: { max_chars_per_result: 2000 },
+      },
     });
 
     // Have LLM analyze the evidence
@@ -148,7 +150,7 @@ EXPLANATION: [Brief 1-2 sentence explanation]`,
 Evidence from web search:
 ${JSON.stringify(searchResult.results?.slice(0, 3).map(r => ({
   title: r.title,
-  excerpt: r.excerpts?.slice(0, 500)
+  excerpt: r.excerpts?.join("\n").slice(0, 2000)
 })), null, 2)}`,
       maxOutputTokens: 500,
     });
@@ -176,11 +178,10 @@ await Promise.all(
 When a user provides a URL, we extract the content using Parallel's Extract API:
 
 ```typescript
-const extractResult = await parallel.beta.extract({
+const extractResult = await parallel.extract({
   urls: [extractUrl],
   objective: "Extract the article text and key claims from this webpage",
-  excerpts: true,
-  full_content: false,
+  advanced_settings: { full_content: false },
 });
 
 const rawContent = extractResult.results[0].full_content ||
@@ -214,6 +215,8 @@ sendSSE(controller, encoder, { type: "warning", message: "Content was truncated
 sendSSE(controller, encoder, { type: "error", error: "Demo is experiencing high traffic. Please try again later." });
 ```
 
+The `modelText` helper consumes the AI SDK's `fullStream` and throws on error events. Reading `textStream` alone silently filters those events out, which can make failed inference look like content with no claims. Only an actual empty response should be reported as having no verifiable claims.
+
 The frontend handles these events to update the UI in real-time, showing facts as they're extracted and verdicts as they arrive.
 
 ## Setup
@@ -297,6 +300,16 @@ Extract content from URL and fact-check it. Content is truncated to 5,000 charac
 | `error` | Error occurred |
 | `complete` | Processing finished |
 
+## Validation and operations
+
+Run `npm test` for regression tests and `npm run typecheck` for TypeScript validation. Test both pasted text and URL input with working keys before deployment.
+
+The public demo runs as the `cerebras-fact-checker` Cloudflare Worker. Worker invocation logs are enabled in `wrangler.jsonc`. In Cloudflare, use Workers & Pages to inspect this Worker's Metrics and Observability views. Request counts include page loads and API requests; filter by `/check` and `/extract` where possible. A streamed application error can still return HTTP 200, so HTTP success counts alone do not measure successful fact checks.
+
+There is no browser analytics or conversion-event instrumentation in this recipe. Cloudflare traffic and logs can help diagnose usage and failures, but they do not provide a visitor-to-successful-check funnel. Parallel org usage counts API calls, which can include several searches per fact-checking session.
+
+If the deployed demo fails while local tests work, inspect the deployed Worker's inference errors and the credentials in the correct environment. Do not copy a personal key into the public demo. Provision the demo's own service credentials, then test both input paths again.
+
 ## Demo Limitations
 
 This demo has several limitations:
diff --git a/typescript-recipes/parallel-fact-checker-cerebras/package-lock.json b/typescript-recipes/parallel-fact-checker-cerebras/package-lock.json
index 16eb994..c07680a 100644
--- a/typescript-recipes/parallel-fact-checker-cerebras/package-lock.json
+++ b/typescript-recipes/parallel-fact-checker-cerebras/package-lock.json
@@ -10,11 +10,12 @@
       "dependencies": {
         "@ai-sdk/cerebras": "^1.0.32",
         "ai": "^5.0.108",
-        "parallel-web": "latest"
+        "parallel-web": "1.3.3"
       },
       "devDependencies": {
         "@cloudflare/workers-types": "^4.20251209.0",
         "typescript": "^5.9.3",
+        "vitest": "^5.0.0",
         "wrangler": "^4.54.0"
       }
     },
@@ -206,8 +207,7 @@
       "resolved": "https://registry.npmjs.org/@cloudflare/workers-types/-/workers-types-4.20251212.0.tgz",
       "integrity": "sha512-RrvbKQli+zkDSLtqmsQetHoc38Zi6VWajb0E79w3lGDbJ0Qq1T4HavAm5jIQ+1R6CJxpWO6t41aefRakj+ciaw==",
       "dev": true,
-      "license": "MIT OR Apache-2.0",
-      "peer": true
+      "license": "MIT OR Apache-2.0"
     },
     "node_modules/@cspotcode/source-map-support": {
       "version": "0.8.1",
@@ -1090,6 +1090,17 @@
         "node": ">=8.0.0"
       }
     },
+    "node_modules/@oxc-project/types": {
+      "version": "0.148.0",
+      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.148.0.tgz",
+      "integrity": "sha512-Nm4s/jB+4FpFsPhWGEC4h7rzksesmtnMXomo6rCMcg/b8zLQuOziRgkCS1fxDCXOlJB/6Q8oABOZ/OP6RIPj9A==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "funding": {
+        "url": "https://github.com/sponsors/oxc-project"
+      }
+    },
     "node_modules/@poppinss/colors": {
       "version": "4.1.6",
       "resolved": "https://registry.npmjs.org/@poppinss/colors/-/colors-4.1.6.tgz",
@@ -1119,6 +1130,302 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@rolldown/binding-android-arm-eabi": {
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+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
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+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "peer": true,
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/binding-android-arm64": {
+      "version": "1.2.7",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.2.7.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "peer": true,
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/pluginutils": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.1.tgz",
+      "integrity": "sha512-2j9bGt5Jh8hj+vPtgzPtl72j0yRxHAyumoo6TNfAjsLB04UtpSvPbPcDcBMxz7n+9CYB0c1GxQFxYRg2jimqGw==",
+      "dev": true,
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     "node_modules/@sindresorhus/is": {
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-7.1.1.tgz",
@@ -1143,6 +1450,31 @@
       "version": "1.0.0",
       "license": "MIT"
     },
+    "node_modules/@types/chai": {
+      "version": "5.2.3",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-5.2.3.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/deep-eql": "*",
+        "assertion-error": "^2.0.1"
+      }
+    },
+    "node_modules/@types/deep-eql": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/@types/deep-eql/-/deep-eql-4.0.2.tgz",
+      "integrity": "sha512-c9h9dVVMigMPc4bwTvC5dxqtqJZwQPePsWjPlpSOnojbor6pGqdk541lfA7AqFQr5pB1BRdq0juY9db81BwyFw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/estree": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.9.tgz",
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+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@vercel/oidc": {
       "version": "3.0.5",
       "license": "Apache-2.0",
@@ -1150,6 +1482,55 @@
         "node": ">= 20"
       }
     },
+    "node_modules/@vitest/mocker": {
+      "version": "5.0.0",
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+      "license": "MIT",
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+        "@jridgewell/trace-mapping": "0.3.31",
+        "@vitest/spy": "5.0.0",
+        "estree-walker": "^3.0.3",
+        "magic-string": "^1.2.3"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "msw": "^2.4.9",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "msw": {
+          "optional": true
+        },
+        "vite": {
+          "optional": true
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+    "node_modules/@vitest/mocker/node_modules/@jridgewell/trace-mapping": {
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+      "license": "MIT",
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+        "@jridgewell/sourcemap-codec": "^1.4.14"
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+        "@oxc-project/types": "=0.148.0",
+        "@rolldown/pluginutils": "^1.0.0"
+      },
+      "bin": {
+        "rolldown": "bin/cli.mjs"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "optionalDependencies": {
+        "@rolldown/binding-android-arm-eabi": "1.2.7",
+        "@rolldown/binding-android-arm64": "1.2.7",
+        "@rolldown/binding-darwin-arm64": "1.2.7",
+        "@rolldown/binding-darwin-x64": "1.2.7",
+        "@rolldown/binding-freebsd-x64": "1.2.7",
+        "@rolldown/binding-linux-arm-gnueabihf": "1.2.7",
+        "@rolldown/binding-linux-arm64-gnu": "1.2.7",
+        "@rolldown/binding-linux-arm64-musl": "1.2.7",
+        "@rolldown/binding-linux-ppc64-gnu": "1.2.7",
+        "@rolldown/binding-linux-s390x-gnu": "1.2.7",
+        "@rolldown/binding-linux-x64-gnu": "1.2.7",
+        "@rolldown/binding-linux-x64-musl": "1.2.7",
+        "@rolldown/binding-openharmony-arm64": "1.2.7",
+        "@rolldown/binding-win32-arm64-msvc": "1.2.7",
+        "@rolldown/binding-win32-x64-msvc": "1.2.7"
+      }
+    },
     "node_modules/semver": {
       "version": "7.7.3",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
@@ -1499,6 +2360,13 @@
         "@img/sharp-win32-x64": "0.33.5"
       }
     },
+    "node_modules/siginfo": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/siginfo/-/siginfo-2.0.0.tgz",
+      "integrity": "sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/simple-swizzle": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/simple-swizzle/-/simple-swizzle-0.2.4.tgz",
@@ -1509,6 +2377,31 @@
         "is-arrayish": "^0.3.1"
       }
     },
+    "node_modules/source-map-js": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
+      "integrity": "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "peer": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/stackback": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/stackback/-/stackback-0.0.2.tgz",
+      "integrity": "sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/std-env": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/std-env/-/std-env-4.2.0.tgz",
+      "integrity": "sha512-oCUKSupKTHX53EyjDtuZQ64pjLJ6yYCtpmEw0goYxtjG9KpbRe8KAsl2tBUGU9DyMcJ0RwJ8GqJAFzMXcXW1Rw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/stoppable": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/stoppable/-/stoppable-1.1.0.tgz",
@@ -1533,6 +2426,43 @@
         "url": "https://github.com/chalk/supports-color?sponsor=1"
       }
     },
+    "node_modules/tinybench": {
+      "version": "6.1.4",
+      "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-6.1.4.tgz",
+      "integrity": "sha512-9APumHG7r4yOk4X4WlkmE71aZcv1gvin1czO3OQ1U9iJcFA5Ja/ygyb0vPOVHTthFozUYs8CLoLUlM8grb2lTQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.0.0"
+      }
+    },
+    "node_modules/tinyexec": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.3.0.tgz",
+      "integrity": "sha512-QKAl9m8gWWGHV8jZcPeym6j+XULi6tOf1mT83WYJ4Lk2ytW/uwAWkrP0uFsdoYMdueVJ0qs26wZ+23xeB4ibNQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/tinyglobby": {
+      "version": "0.2.17",
+      "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.17.tgz",
+      "integrity": "sha512-wXR/dYpcqKmfWpEdZjiKJOwCNFndD0DMnrW/cYjVGttEkBfVgcLFHoNrlj47mjOVic9yyNu65alsgF4NQyTa2g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.4"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/SuperchupuDev"
+      }
+    },
     "node_modules/tslib": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
@@ -1569,11 +2499,189 @@
       "integrity": "sha512-i7qRCmY42zmCwnYlh9H2SvLEypEFGye5iRmEMKjcGi7zk9UquigRjFtTLz0TYqr0ZGLZhaMHl/foy1bZR+Cwlw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "pathe": "^2.0.3"
       }
     },
+    "node_modules/vite": {
+      "version": "8.2.2",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-8.2.2.tgz",
+      "integrity": "sha512-cFKLV/PRgAUlIRm5WjMjJ86jrftzpqcgH+Us+DS8mI3CDNiH30Whrz8uHL3+MOLPAgqbMBAqWdAHAphOAM+z/Q==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "lightningcss": "^1.33.0",
+        "picomatch": "^4.0.5",
+        "postcss": "^8.5.26",
+        "rolldown": "~1.2.4",
+        "tinyglobby": "^0.2.17"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^20.19.0 || >=22.12.0",
+        "@vitejs/devtools": "^0.4.0 || ^0.5.0",
+        "esbuild": "^0.27.0 || ^0.28.0",
+        "jiti": ">=1.21.0",
+        "less": "^4.0.0",
+        "sass": "^1.70.0",
+        "sass-embedded": "^1.70.0",
+        "stylus": ">=0.54.8",
+        "sugarss": "^5.0.0",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "@vitejs/devtools": {
+          "optional": true
+        },
+        "esbuild": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vitest": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-5.0.0.tgz",
+      "integrity": "sha512-gpsMNoRhMjMktVxPtstOH4/PJuPyovVaMDr4oDilXaGH1EcqM2OE96SoHT2VIQ6fTGtTjqmHDrEu2X9RQiXf8Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/chai": "^5.2.2",
+        "@vitest/mocker": "5.0.0",
+        "chai": "^6.2.2",
+        "es-module-lexer": "^2.3.2",
+        "expect-type": "^1.4.0",
+        "magic-string": "^1.2.3",
+        "obug": "^2.1.4",
+        "picomatch": "^4.0.7",
+        "std-env": "^4.2.0",
+        "tinybench": "6.1.4",
+        "tinyexec": "1.3.0",
+        "tinyglobby": "^0.2.17",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^22.12.0 || ^24.0.0 || >=26.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "5.0.0",
+        "@vitest/browser-preview": "5.0.0",
+        "@vitest/browser-webdriverio": "^5.0.0-beta.5 || >=5.0.0",
+        "@vitest/coverage-istanbul": "5.0.0",
+        "@vitest/coverage-v8": "5.0.0",
+        "@vitest/ui": "5.0.0",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.4.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/workerd": {
       "version": "1.20251210.0",
       "resolved": "https://registry.npmjs.org/workerd/-/workerd-1.20251210.0.tgz",
@@ -1581,7 +2689,6 @@
       "dev": true,
       "hasInstallScript": true,
       "license": "Apache-2.0",
-      "peer": true,
       "bin": {
         "workerd": "bin/workerd"
       },
diff --git a/typescript-recipes/parallel-fact-checker-cerebras/package.json b/typescript-recipes/parallel-fact-checker-cerebras/package.json
index dcc6438..d81bd1a 100644
--- a/typescript-recipes/parallel-fact-checker-cerebras/package.json
+++ b/typescript-recipes/parallel-fact-checker-cerebras/package.json
@@ -5,16 +5,19 @@
   "scripts": {
     "dev": "wrangler dev",
     "deploy": "wrangler deploy",
-    "types": "wrangler types"
+    "types": "wrangler types",
+    "test": "vitest run",
+    "typecheck": "tsc --noEmit"
   },
   "dependencies": {
     "@ai-sdk/cerebras": "^1.0.32",
     "ai": "^5.0.108",
-    "parallel-web": "latest"
+    "parallel-web": "1.3.3"
   },
   "devDependencies": {
     "@cloudflare/workers-types": "^4.20251209.0",
     "typescript": "^5.9.3",
+    "vitest": "^5.0.0",
     "wrangler": "^4.54.0"
   }
 }
diff --git a/typescript-recipes/parallel-fact-checker-cerebras/worker.test.ts b/typescript-recipes/parallel-fact-checker-cerebras/worker.test.ts
new file mode 100644
index 0000000..7d76a9a
--- /dev/null
+++ b/typescript-recipes/parallel-fact-checker-cerebras/worker.test.ts
@@ -0,0 +1,132 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import worker from "./worker";
+
+vi.mock("./index.html", () => ({ default: "<h1>Fact checker</h1>" }));
+
+const claim = "Paris is the capital of France.";
+const env = { PARALLEL_API_KEY: "test-key", CEREBRAS_API_KEY: "test-key" };
+const requests: Array<{ url: string; body: any }> = [];
+let inference: Array<() => Response>;
+let searchStatus: number;
+
+function textResponse(text: string): Response {
+  const chunks = [
+    { choices: [{ index: 0, delta: { content: text }, finish_reason: null }] },
+    { choices: [{ index: 0, delta: {}, finish_reason: "stop" }] },
+  ];
+  return new Response(chunks.map(chunk => `data: ${JSON.stringify(chunk)}\n\n`).join("") + "data: [DONE]\n\n", {
+    headers: { "Content-Type": "text/event-stream" },
+  });
+}
+
+function apiError(status: number): Response {
+  return Response.json({ error: { message: "Private provider diagnostic", type: "api_error" } }, { status });
+}
+
+async function events(path: string, body: object): Promise<any[]> {
+  const response = await worker.fetch(new Request(`https://demo.example${path}`, {
+    method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify(body),
+  }), env, {} as ExecutionContext);
+  expect(response.headers.get("Content-Type")).toBe("text/event-stream");
+  const text = await response.text();
+  expect(text).toContain("data: [DONE]");
+  expect(text).not.toContain("Private provider diagnostic");
+  return text.split("\n").filter(line => line.startsWith("data: {")).map(line => JSON.parse(line.slice(6)));
+}
+
+beforeEach(() => {
+  requests.length = 0;
+  searchStatus = 200;
+  inference = [
+    () => textResponse(`FACT: ${claim} ||| ${claim}`),
+    () => textResponse("VERDICT: VERIFIED\nEXPLANATION: Sources confirm the claim."),
+  ];
+  vi.spyOn(console, "error").mockImplementation(() => {});
+  vi.spyOn(console, "log").mockImplementation(() => {});
+  vi.stubGlobal("fetch", vi.fn(async (input, init) => {
+    const request = new Request(input, init);
+    const body = await request.json();
+    requests.push({ url: request.url, body });
+    const path = new URL(request.url).pathname;
+    if (request.url.startsWith("https://api.cerebras.ai/") && path === "/v1/chat/completions") {
+      const next = inference.shift();
+      if (!next) throw new Error("Unexpected inference request");
+      return next();
+    }
+    if (request.url === "https://api.parallel.ai/v1/search") {
+      if (searchStatus !== 200) return apiError(searchStatus);
+      return Response.json({ search_id: "test-search", results: [{
+        title: "Reference", url: "https://example.com/reference", excerpts: [claim],
+      }] });
+    }
+    if (request.url === "https://api.parallel.ai/v1/extract") {
+      return Response.json({ extract_id: "test-extract", errors: [], results: [{
+        title: "Article", url: body.urls[0], excerpts: [claim],
+      }] });
+    }
+    throw new Error(`Unexpected network request: ${request.url}`);
+  }));
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  vi.unstubAllGlobals();
+});
+
+describe("fact checker with the real provider SDKs", () => {
+  it.each(["/check", "/agents/cerebras-fact-checker/check"])("checks pasted text through %s", async path => {
+    const result = await events(path, { content: claim });
+    expect(result.find(event => event.type === "fact_verdict")).toMatchObject({
+      status: "verified", explanation: "Sources confirm the claim.",
+      references: [{ title: "Reference", url: "https://example.com/reference", excerpt: claim }],
+    });
+    expect(requests.find(request => request.url.endsWith("/search"))?.body).toMatchObject({
+      mode: "basic", advanced_settings: { max_results: 5, excerpt_settings: { max_chars_per_result: 2000 } },
+    });
+  });
+
+  it("extracts a URL and completes the same verification flow", async () => {
+    const result = await events("/agents/cerebras-fact-checker/extract", { url: "https://example.com/article" });
+    expect(result.find(event => event.type === "content_complete")).toMatchObject({ content: claim });
+    expect(result.find(event => event.type === "fact_verdict")?.status).toBe("verified");
+    expect(requests[0].body).toMatchObject({ advanced_settings: { full_content: false } });
+  });
+
+  it.each(["/check", "/extract"])("surfaces inference authentication failure on %s", async path => {
+    inference = [() => apiError(401)];
+    const result = await events(path, { content: claim, url: "https://example.com/article" });
+    expect(result.find(event => event.type === "error")?.error).toContain("cannot access an upstream service");
+    expect(result.some(event => event.type === "fact_verdict")).toBe(false);
+    expect(requests.some(request => request.url.endsWith("/search"))).toBe(false);
+  });
+
+  it("distinguishes content without claims from failed inference", async () => {
+    inference = [() => textResponse("No verifiable claims.")];
+    const result = await events("/check", { content: "I like this color." });
+    expect(result.find(event => event.type === "error")?.error).toBe("No verifiable claims were found in the content.");
+  });
+
+  it("reports a failed verdict request explicitly", async () => {
+    inference[1] = () => apiError(403);
+    const result = await events("/check", { content: claim });
+    expect(result.find(event => event.type === "fact_verdict")).toMatchObject({
+      status: "unsure", explanation: expect.stringContaining("cannot access an upstream service"), references: [],
+    });
+  });
+
+  it("does not accept a truncated verdict as a verified claim", async () => {
+    inference[1] = () => textResponse("VERDICT: VERIFIED");
+    const result = await events("/check", { content: claim });
+    expect(result.find(event => event.type === "fact_verdict")).toMatchObject({
+      status: "unsure", explanation: expect.stringContaining("incomplete verdict"), references: [],
+    });
+  });
+
+  it("reports exhausted search credits without exposing provider details", async () => {
+    searchStatus = 402;
+    const result = await events("/check", { content: claim });
+    expect(result.find(event => event.type === "fact_verdict")).toMatchObject({
+      status: "unsure", explanation: expect.stringContaining("credits are unavailable"), references: [],
+    });
+  });
+});
diff --git a/typescript-recipes/parallel-fact-checker-cerebras/worker.ts b/typescript-recipes/parallel-fact-checker-cerebras/worker.ts
index ded312c..890f88b 100644
--- a/typescript-recipes/parallel-fact-checker-cerebras/worker.ts
+++ b/typescript-recipes/parallel-fact-checker-cerebras/worker.ts
@@ -38,6 +38,30 @@ function sendSSE(controller: ReadableStreamDefaultController, encoder: TextEncod
   controller.enqueue(encoder.encode(`data: ${JSON.stringify(data)}\n\n`));
 }
 
+// Only these errors contain messages intended for the public demo UI.
+class DemoError extends Error {}
+
+function publicErrorMessage(error: any): string {
+  if (error instanceof DemoError) return error.message;
+  const cause = error?.lastError ?? error;
+  const status = cause?.statusCode ?? cause?.status;
+  if (status === 429) return "Service is currently rate limited. Please try again in a moment.";
+  if (status === 401 || status === 403) {
+    return "The demo cannot access an upstream service. Please contact the demo owner.";
+  }
+  if (status === 402) return "The demo's service credits are unavailable. Please contact the demo owner.";
+  return "The fact-checking service is unavailable. Please try again later.";
+}
+
+// AI SDK textStream filters out error events. Consume fullStream so a failed
+// inference request cannot look like empty content or an unsupported claim.
+async function* modelText(result: ReturnType<typeof streamText>): AsyncGenerator<string> {
+  for await (const part of result.fullStream) {
+    if (part.type === "error") throw part.error;
+    if (part.type === "text-delta") yield part.text;
+  }
+}
+
 // Parse a fact line with format: FACT: [source span] ||| [claim]
 function parseFactLine(line: string): { sourceSpan: string; text: string } | null {
   const factContent = line.replace("FACT:", "").trim();
@@ -90,7 +114,7 @@ RULES:
     let currentText = "";
     let totalResponse = "";
 
-    for await (const chunk of factsResult.textStream) {
+    for await (const chunk of modelText(factsResult)) {
       currentText += chunk;
       totalResponse += chunk;
 
@@ -132,7 +156,7 @@ RULES:
     // If no facts were found, throw so outer handler can deal with it
     if (extractedFacts.length === 0) {
       console.log("No facts extracted. Response length:", totalResponse.length);
-      throw new Error("No facts could be extracted from the content.");
+      throw new DemoError("No verifiable claims were found in the content.");
     }
   } catch (error: any) {
     console.error("Error extracting facts:", error);
@@ -155,12 +179,14 @@ async function verifyFact(
     sendSSE(controller, encoder, { type: "fact_status", factId: fact.id, status: "searching" });
 
     // Search for evidence
-    const searchResult = await parallel.beta.search({
+    const searchResult = await parallel.search({
       objective: `Find reliable sources to verify or refute this claim: "${fact.text}"`,
       search_queries: [fact.text],
-      processor: "base",
-      max_results: 5,
-      max_chars_per_result: 2000,
+      mode: "basic",
+      advanced_settings: {
+        max_results: 5,
+        excerpt_settings: { max_chars_per_result: 2000 },
+      },
     });
 
     // Get verdict from LLM
@@ -180,7 +206,7 @@ EXPLANATION: [Brief 1-2 sentence explanation of your reasoning]`,
 Evidence from web search:
 ${JSON.stringify(searchResult.results?.slice(0, 3).map((r: any) => ({
   title: r.title,
-  excerpt: r.excerpts?.slice(0, 500)
+  excerpt: r.excerpts?.join("\n").slice(0, 2000)
 })), null, 2)}
 
 Analyze this evidence and provide your verdict.`,
@@ -188,20 +214,17 @@ Analyze this evidence and provide your verdict.`,
     });
 
     let verdictText = "";
-    for await (const chunk of verdictResult.textStream) {
+    for await (const chunk of modelText(verdictResult)) {
       verdictText += chunk;
     }
 
-    // Parse verdict
-    let status: Fact["status"] = "unsure";
-    if (verdictText.includes("VERDICT: VERIFIED") || verdictText.includes("VERDICT:VERIFIED")) {
-      status = "verified";
-    } else if (verdictText.includes("VERDICT: FALSE") || verdictText.includes("VERDICT:FALSE")) {
-      status = "false";
+    const verdictMatch = verdictText.match(/^VERDICT:\s*(VERIFIED|FALSE|UNSURE)\s*$/im);
+    const explanationMatch = verdictText.match(/^EXPLANATION:[ \t]*(.+)/im);
+    if (!verdictMatch || !explanationMatch) {
+      throw new DemoError("The fact-checking service returned an incomplete verdict. Please try again.");
     }
-
-    const explanationMatch = verdictText.match(/EXPLANATION:\s*(.+)/is);
-    const explanation = explanationMatch ? explanationMatch[1].trim().split('\n')[0] : "";
+    const status = verdictMatch[1].toLowerCase() as Fact["status"];
+    const explanation = explanationMatch[1].trim();
 
     const references = searchResult.results?.slice(0, 3).map((r: any) => ({
       title: r.title || "Source",
@@ -219,27 +242,7 @@ Analyze this evidence and provide your verdict.`,
   } catch (error: any) {
     console.error(`Error verifying fact ${fact.id}:`, error);
 
-    // Check for rate limit errors (various patterns from different APIs)
-    const errorStr = JSON.stringify(error) + (error?.message || '') + (error?.lastError?.message || '');
-    const isRateLimit = error?.statusCode === 429 ||
-      error?.lastError?.statusCode === 429 ||
-      errorStr.includes("too_many_requests") ||
-      errorStr.includes("high traffic") ||
-      errorStr.includes("rate limit") ||
-      errorStr.includes("limit exceeded") ||
-      errorStr.includes("RetryError");
-
-    const explanation = isRateLimit
-      ? "Rate limited - please try again later"
-      : "Could not verify due to an error";
-
-    // Send rate limit warning to UI
-    if (isRateLimit) {
-      sendSSE(controller, encoder, {
-        type: "warning",
-        message: "Demo is experiencing high traffic. Some claims could not be verified."
-      });
-    }
+    const explanation = publicErrorMessage(error);
 
     sendSSE(controller, encoder, {
       type: "fact_verdict",
@@ -294,22 +297,21 @@ export default {
               // Phase 1: Extract content from URL using Parallel
               sendSSE(controller, encoder, { type: "phase", phase: "extracting_url" });
 
-              const extractResult = await parallel.beta.extract({
+              const extractResult = await parallel.extract({
                 urls: [extractUrl],
                 objective: "Extract the article text and key claims from this webpage",
-                excerpts: true,
-                full_content: false,
+                advanced_settings: { full_content: false },
               });
 
               if (!extractResult.results || extractResult.results.length === 0) {
-                throw new Error("Could not extract content from URL");
+                throw new DemoError("Could not extract content from URL");
               }
 
               const rawContent = extractResult.results[0].full_content ||
                 extractResult.results[0].excerpts?.join('\n\n') || '';
 
               if (!rawContent) {
-                throw new Error("No content found at URL");
+                throw new DemoError("No content found at URL");
               }
 
               // Truncate content if needed
@@ -346,11 +348,7 @@ export default {
               controller.enqueue(encoder.encode("data: [DONE]\n\n"));
             } catch (error: any) {
               console.error("Stream error:", error);
-              // Send user-friendly error message
-              const errorMsg = error?.message?.includes("limit") || error?.message?.includes("rate") || error?.message?.includes("Retry")
-                ? "Service is currently rate limited. Please try again in a moment."
-                : error.message || "An error occurred";
-              sendSSE(controller, encoder, { type: "error", error: errorMsg });
+              sendSSE(controller, encoder, { type: "error", error: publicErrorMessage(error) });
               sendSSE(controller, encoder, { type: "complete" });
               controller.enqueue(encoder.encode("data: [DONE]\n\n"));
             } finally {
@@ -426,11 +424,7 @@ export default {
               controller.enqueue(encoder.encode("data: [DONE]\n\n"));
             } catch (error: any) {
               console.error("Stream error:", error);
-              // Send user-friendly error message
-              const errorMsg = error?.message?.includes("limit") || error?.message?.includes("rate") || error?.message?.includes("Retry")
-                ? "Service is currently rate limited. Please try again in a moment."
-                : error.message || "An error occurred";
-              sendSSE(controller, encoder, { type: "error", error: errorMsg });
+              sendSSE(controller, encoder, { type: "error", error: publicErrorMessage(error) });
               sendSSE(controller, encoder, { type: "complete" });
               controller.enqueue(encoder.encode("data: [DONE]\n\n"));
             } finally {