fix: improve review inline/body discipline and agent reliability

mcp/readFile.ts

@@ -4,7 +4,7 @@ import type { ToolContext } from "./server.ts";
 import { execute, tool } from "./shared.ts";
 
 /** Hard cap on returned content to avoid flooding the model's context window. */
-const MAX_CHARS = 6000;
+const MAX_CHARS = 20000;
 
 export const ReadFileParams = type({
   path: type.string.describe("absolute path to the file to read"),
@@ -17,9 +17,10 @@ export function ReadFileTool(_ctx: ToolContext) {
     name: "read_file",
     description:
       "Read lines from a file. Use this to read sections of the PR diff returned by checkout_pr. " +
-      `Returns at most ${MAX_CHARS} characters — use narrow line ranges to stay within budget. ` +
-      "Read selectively: only the files most relevant to the review, not the entire diff at once. " +
-      "Example: `read_file({ path: diffPath, start_line: 5, end_line: 42 })`.",
+      `Returns at most ${MAX_CHARS} characters. ` +
+      "Prefer fewer, wider reads: read large contiguous ranges rather than many small ones. " +
+      "If the TOC lists 10 files, read 3-4 wide ranges that cover them rather than 10 separate calls. " +
+      "Example: `read_file({ path: diffPath, start_line: 5, end_line: 200 })`.",
     parameters: ReadFileParams,
     execute: execute(async ({ path, start_line, end_line }) => {
       let content: string;