initial version of pr review tools

mcp/prInfo.ts

@@ -0,0 +1,34 @@
+import { type } from "arktype";
+import { contextualize, tool } from "./shared.ts";
+
+export const PullRequestInfo = type({
+  pull_number: type.number.describe("The pull request number to fetch"),
+});
+
+export const PullRequestInfoTool = tool({
+  name: "get_pull_request",
+  description: "Retrieve detailed information and diff for a specific pull request by number.",
+  parameters: PullRequestInfo,
+  execute: contextualize(async ({ pull_number }, ctx) => {
+    const pr = await ctx.octokit.rest.pulls.get({
+      owner: ctx.owner,
+      repo: ctx.name,
+      pull_number,
+    });
+
+    // Fetch diff using raw request
+    const diff = await ctx.octokit.request('GET /repos/{owner}/{repo}/pulls/{pull_number}', {
+      owner: ctx.owner,
+      repo: ctx.name,
+      pull_number,
+      headers: {
+        Accept: 'application/vnd.github.v3.diff',
+      },
+    });
+
+    return {
+      ...pr.data,
+      diff: diff.data,
+    };
+  }),
+});