diff --git a/.github/workflows/code-review.yml b/.github/workflows/code-review.yml
index 3494314..fce8b2f 100644
--- a/.github/workflows/code-review.yml
+++ b/.github/workflows/code-review.yml
@@ -31,5 +31,7 @@ jobs:
           PR_NUMBER: ${{ github.event.pull_request.number }}
           REPO_NAME: ${{ github.repository }}
           COMMIT_SHA: ${{ github.event.pull_request.head.sha }}
+          BEFORE_SHA: ${{ github.event.before }}
+          EVENT_ACTION: ${{ github.event.action }}
         run: npm start
         working-directory: scripts
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3cdd420
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+node_modules/
+scripts/dist/
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b646970
--- /dev/null
+++ b/README.md
@@ -0,0 +1,105 @@
+# AI Code Reviewer
+
+A GitHub Actions bot that automatically reviews pull requests using the Claude API. When a PR is opened or updated, the bot fetches the diff, sends each changed file to Claude for analysis, and posts inline comments and a summary directly on the PR.
+
+The bot is based on the following guide: [cloudflare tutorials](https://developers.cloudflare.com/sandbox/tutorials/code-review-bot/)
+
+---
+
+## Setup
+
+### 1. Copy the workflow file
+
+Copy `.github/workflows/code-review.yml` into your target repository.
+
+### 2. Copy the scripts folder
+
+Copy the entire `scripts/` folder into the root of your target repository.
+
+### 3. Add the API key secret
+
+In your repository go to **Settings → Secrets and variables → Actions** and add:
+
+| Secret name | Value |
+|---|---|
+| `ANTHROPIC_API_KEY` | Your API key from [console.anthropic.com](https://console.anthropic.com) |
+
+`GITHUB_TOKEN` is provided automatically by GitHub Actions, you do not need to add it.
+
+### 4. That's it
+
+Open a pull request and the bot will trigger automatically.
+
+---
+
+## What the bot reviews
+
+- Only files changed in the PR
+- On a re-push to an existing PR, only files changed in that specific push (not the whole PR again)
+
+## What the bot skips
+
+- `package-lock.json` and all `*.lock` files
+- Anything inside a `dist/` directory
+
+To add more exclusions, edit the `IGNORED_FILES` regex in `scripts/src/constants.ts`.
+
+---
+
+## Customising the review instructions
+
+The prompt that controls what Claude focuses on lives in `scripts/src/constants.ts` as `REVIEW_INSTRUCTIONS`. Edit it to change the tone, focus areas, or output format.
+
+---
+
+## Project flow
+
+### Entry point
+
+GitHub Actions triggers the workflow in `.github/workflows/code-review.yml` whenever a PR is opened or a new commit is pushed to one. The workflow checks out the code, installs dependencies, and runs:
+
+```
+npm start  →  tsx src/review.ts
+```
+
+### `scripts/src/review.ts` — orchestrator
+
+This is where execution begins. `main()` calls the other modules in order:
+
+1. `getPRFiles()` — fetch the files to review
+2. `reviewFile()` — send each file to Claude
+3. `postReview()` — post inline comments on the PR
+4. `postSummary()` — post a top-level summary comment
+
+### `scripts/src/github.ts` — GitHub API
+
+Handles all communication with GitHub:
+
+- **`getPRFiles()`** — decides which files to fetch. On a new PR (`opened`) it fetches all changed files via `listFiles`. On a re-push (`synchronize`) it uses `compareCommits` between the previous and new SHA so only the files touched in that push are reviewed. Both paths filter out ignored files and parse each patch into a `DiffFile`.
+- **`parseValidLines()`** — reads the raw unified diff and builds a `Set<number>` of line numbers that actually exist in the new version of the file. Used to drop any comment Claude returns that references a line outside the diff.
+- **`postReview()`** — posts all inline comments as a single GitHub review. If the batch call fails (e.g. one bad line number slipped through), it falls back to posting each comment individually so the rest are not lost.
+- **`postSummary()`** — posts a top-level PR comment with a count of issues found per file, or a "no issues found" message if Claude had nothing to say.
+
+### `scripts/src/claude.ts` — Claude API
+
+Contains a single function `reviewFile()` which:
+
+1. Sends the file path and its diff patch to `claude-sonnet-4-6` with the review instructions as a cached system prompt
+2. Strips any markdown fences from the response (Claude sometimes wraps JSON in fences despite being told not to)
+3. Parses the JSON array of comments
+4. Filters out any comment whose `path` doesn't match the file being reviewed or whose `line` is not in the valid line set
+
+### `scripts/src/constants.ts` — static config
+
+Holds three exports used across the other modules:
+
+- `REVIEW_INSTRUCTIONS` — the system prompt sent to Claude on every call
+- `IGNORED_FILES` — the regex used to filter out generated and lock files
+- `MODEL` — the Claude model name, in one place so it's easy to change
+
+### `scripts/src/types.ts` — shared types
+
+Defines two interfaces used across all modules:
+
+- `DiffFile` — a changed file with its filename, raw patch string, and the set of valid line numbers
+- `ReviewComment` — a single comment with a file path, line number, and body text
diff --git a/scripts/package-lock.json b/scripts/package-lock.json
new file mode 100644
index 0000000..a109344
--- /dev/null
+++ b/scripts/package-lock.json
@@ -0,0 +1,1225 @@
+{
+  "name": "ai-code-reviewer",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "ai-code-reviewer",
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+        "@octokit/rest": "^21.0.0"
+      },
+      "devDependencies": {
+        "@types/node": "^22.0.0",
+        "tsx": "^4.0.0",
+        "typescript": "^5.0.0"
+      }
+    },
+    "node_modules/@anthropic-ai/sdk": {
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+      "license": "MIT",
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+        "@types/node-fetch": "^2.6.4",
+        "abort-controller": "^3.0.0",
+        "agentkeepalive": "^4.2.1",
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+        "formdata-node": "^4.3.2",
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+      }
+    },
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+}
diff --git a/scripts/package.json b/scripts/package.json
new file mode 100644
index 0000000..df27d2c
--- /dev/null
+++ b/scripts/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "ai-code-reviewer",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "start": "tsx src/review.ts",
+    "build": "tsc"
+  },
+  "dependencies": {
+    "@anthropic-ai/sdk": "^0.39.0",
+    "@octokit/rest": "^21.0.0"
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "tsx": "^4.0.0",
+    "typescript": "^5.0.0"
+  }
+}
\ No newline at end of file
diff --git a/scripts/src/claude.ts b/scripts/src/claude.ts
new file mode 100644
index 0000000..71db3c6
--- /dev/null
+++ b/scripts/src/claude.ts
@@ -0,0 +1,48 @@
+import Anthropic from "@anthropic-ai/sdk";
+import { MODEL, REVIEW_INSTRUCTIONS } from "./constants.js";
+import type { DiffFile, ReviewComment } from "./types.js";
+
+const anthropic = new Anthropic({ apiKey: process.env.ANTHROPIC_API_KEY });
+
+export async function reviewFile(file: DiffFile): Promise<ReviewComment[]> {
+  const response = await anthropic.messages.create({
+    model: MODEL,
+    max_tokens: 4096,
+    system: [
+      {
+        type: "text",
+        text: REVIEW_INSTRUCTIONS,
+        cache_control: { type: "ephemeral" },
+      },
+    ],
+    messages: [
+      {
+        role: "user",
+        content: `File: ${file.filename}\n\nDiff:\n${file.patch}`,
+      },
+    ],
+  });
+
+  const raw = response.content[0].type === "text" ? response.content[0].text : "[]";
+  const text = raw.replace(/^```(?:json)?\n?/i, "").replace(/\n?```$/i, "").trim();
+
+  let comments: ReviewComment[];
+  try {
+    comments = JSON.parse(text) as ReviewComment[];
+  } catch {
+    console.error(`Failed to parse response for ${file.filename}:`, text);
+    return [];
+  }
+
+  return comments.filter((c) => {
+    if (c.path !== file.filename) {
+      console.warn(`Dropping comment with mismatched path: ${c.path}`);
+      return false;
+    }
+    if (!file.validLines.has(c.line)) {
+      console.warn(`Dropping comment on invalid line ${c.line} in ${file.filename}`);
+      return false;
+    }
+    return true;
+  });
+}
diff --git a/scripts/src/constants.ts b/scripts/src/constants.ts
new file mode 100644
index 0000000..a406bd4
--- /dev/null
+++ b/scripts/src/constants.ts
@@ -0,0 +1,28 @@
+export const REVIEW_INSTRUCTIONS = `You are an expert code reviewer. Review the provided git diff and give concise, actionable feedback.
+
+Focus ONLY on real, substantive issues:
+- Bugs and logic errors
+- Security vulnerabilities
+- Performance issues
+- Unclear or misleading naming that would genuinely confuse a reader
+
+Do NOT comment on:
+- Code style or formatting
+- Minor nitpicks or subjective preferences
+- Things that work correctly even if you'd do them differently
+- Anything that is not a clear problem
+
+If the code looks fine, return an empty array. Do not invent issues to seem useful.
+
+Respond with a JSON array of comments. Each comment must have:
+- "path": the file path (string)
+- "line": the line number in the NEW file (right side of the diff) to attach the comment to (number)
+- "body": your review comment (string)
+
+If there is nothing worth commenting on, return an empty array: []
+
+Return ONLY valid JSON. No explanation, no markdown fences.`;
+
+export const IGNORED_FILES = /package-lock\.json|\.lock$|(^|\/)dist\//;
+
+export const MODEL = "claude-sonnet-4-6";
diff --git a/scripts/src/github.ts b/scripts/src/github.ts
new file mode 100644
index 0000000..950fd38
--- /dev/null
+++ b/scripts/src/github.ts
@@ -0,0 +1,142 @@
+import { Octokit } from "@octokit/rest";
+import { IGNORED_FILES } from "./constants.js";
+import type { DiffFile, ReviewComment } from "./types.js";
+
+export const octokit = new Octokit({ auth: process.env.GITHUB_TOKEN });
+
+const repoName = process.env.REPO_NAME ?? "";
+if (!repoName.includes("/")) {
+  throw new Error(`REPO_NAME must be in "owner/repo" format, got: "${repoName}"`);
+}
+export const [owner, repo] = repoName.split("/");
+export const prNumber = parseInt(process.env.PR_NUMBER ?? "0", 10);
+export const commitSha = process.env.COMMIT_SHA ?? "";
+const beforeSha = process.env.BEFORE_SHA ?? "";
+const eventAction = process.env.EVENT_ACTION ?? "opened";
+
+export function parseValidLines(patch: string): Set<number> {
+  const valid = new Set<number>();
+  let currentLine = 0;
+  for (const line of patch.split("\n")) {
+    const hunkHeader = line.match(/^@@ -\d+(?:,\d+)? \+(\d+)(?:,(\d+))? @@/);
+    if (hunkHeader) {
+      currentLine = parseInt(hunkHeader[1], 10);
+      continue;
+    }
+    if (line.startsWith("-")) continue;
+    valid.add(currentLine);
+    currentLine++;
+  }
+  return valid;
+}
+
+function toDiffFiles(files: { filename: string; patch?: string }[]): DiffFile[] {
+  return files
+    .filter((f) => !f.filename.match(IGNORED_FILES))
+    .filter((f) => f.patch !== undefined)
+    .map((f) => ({
+      filename: f.filename,
+      patch: f.patch!,
+      validLines: parseValidLines(f.patch!),
+    }));
+}
+
+export async function getPRFiles(): Promise<DiffFile[]> {
+  if (
+    eventAction === "synchronize" &&
+    beforeSha &&
+    beforeSha !== "0000000000000000000000000000000000000000"
+  ) {
+    const { data } = await octokit.repos.compareCommits({
+      owner,
+      repo,
+      base: beforeSha,
+      head: commitSha,
+    });
+    return toDiffFiles(data.files ?? []);
+  }
+
+  const files = await octokit.paginate(octokit.pulls.listFiles, {
+    owner,
+    repo,
+    pull_number: prNumber,
+    per_page: 100,
+  });
+  return toDiffFiles(files);
+}
+
+export async function getExistingBotCommentKeys(): Promise<Set<string>> {
+  const comments = await octokit.paginate(octokit.pulls.listReviewComments, {
+    owner,
+    repo,
+    pull_number: prNumber,
+    per_page: 100,
+  });
+  return new Set(
+    comments
+      .filter((c) => c.user?.login === "github-actions[bot]" && c.line != null)
+      .map((c) => `${c.path}:${c.line}`)
+  );
+}
+
+export async function postSummary(comments: ReviewComment[], filesReviewed: number) {
+  const byFile = comments.reduce<Record<string, number>>((acc, c) => {
+    acc[c.path] = (acc[c.path] ?? 0) + 1;
+    return acc;
+  }, {});
+
+  let body: string;
+  if (comments.length === 0) {
+    body = `## AI Code Review\n\nNo issues found across ${filesReviewed} reviewed file(s).`;
+  } else {
+    const fileLines = Object.entries(byFile)
+      .map(([path, count]) => `- \`${path}\` — ${count} issue(s)`)
+      .join("\n");
+    body = `## AI Code Review\n\nFound **${comments.length} issue(s)** across **${Object.keys(byFile).length} file(s)**:\n\n${fileLines}`;
+  }
+
+  await octokit.issues.createComment({
+    owner,
+    repo,
+    issue_number: prNumber,
+    body,
+  });
+}
+
+export async function postReview(comments: ReviewComment[]) {
+  if (comments.length === 0) {
+    console.log("No comments to post.");
+    return;
+  }
+
+  try {
+    await octokit.pulls.createReview({
+      owner,
+      repo,
+      pull_number: prNumber,
+      commit_id: commitSha,
+      event: "COMMENT",
+      comments: comments.map((c) => ({ path: c.path, line: c.line, body: c.body })),
+    });
+    console.log(`Posted ${comments.length} review comment(s).`);
+  } catch {
+    console.error("Batch review failed, retrying comments individually...");
+    let posted = 0;
+    for (const c of comments) {
+      try {
+        await octokit.pulls.createReview({
+          owner,
+          repo,
+          pull_number: prNumber,
+          commit_id: commitSha,
+          event: "COMMENT",
+          comments: [{ path: c.path, line: c.line, body: c.body }],
+        });
+        posted++;
+      } catch (innerErr) {
+        console.error(`Failed to post comment on ${c.path}:${c.line}:`, innerErr);
+      }
+    }
+    console.log(`Posted ${posted}/${comments.length} comment(s) individually.`);
+  }
+}
diff --git a/scripts/src/review.ts b/scripts/src/review.ts
new file mode 100644
index 0000000..cec91fa
--- /dev/null
+++ b/scripts/src/review.ts
@@ -0,0 +1,37 @@
+import { reviewFile } from "./claude.js";
+import { getExistingBotCommentKeys, getPRFiles, postReview, postSummary } from "./github.js";
+import type { ReviewComment } from "./types.js";
+
+async function main() {
+  const files = await getPRFiles();
+  console.log(`Reviewing ${files.length} file(s)...`);
+
+  const allComments: ReviewComment[] = [];
+
+  for (const file of files) {
+    console.log(`  - ${file.filename}`);
+    try {
+      const comments = await reviewFile(file);
+      allComments.push(...comments);
+    } catch (err) {
+      console.error(`Failed to review ${file.filename}:`, err);
+    }
+  }
+
+  const existingKeys = await getExistingBotCommentKeys();
+  const newComments = allComments.filter(
+    (c) => !existingKeys.has(`${c.path}:${c.line}`)
+  );
+
+  if (existingKeys.size > 0) {
+    console.log(`Skipping ${allComments.length - newComments.length} already-commented line(s).`);
+  }
+
+  await postReview(newComments);
+  await postSummary(newComments, files.length);
+}
+
+main().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});
diff --git a/scripts/src/types.ts b/scripts/src/types.ts
new file mode 100644
index 0000000..4737c64
--- /dev/null
+++ b/scripts/src/types.ts
@@ -0,0 +1,11 @@
+export interface DiffFile {
+  filename: string;
+  patch: string;
+  validLines: Set<number>;
+}
+
+export interface ReviewComment {
+  path: string;
+  line: number;
+  body: string;
+}
diff --git a/scripts/tsconfig.json b/scripts/tsconfig.json
new file mode 100644
index 0000000..6dcdd16
--- /dev/null
+++ b/scripts/tsconfig.json
@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "esModuleInterop": true,
+    "outDir": "dist",
+    "types": ["node"]
+  },
+  "include": ["src/**/*"]
+}
\ No newline at end of file