update README to reflect new capabilities

Author: jackadamson

src/fetch/README.md

@@ -2,21 +2,26 @@
 
 A Model Context Protocol server that provides web content fetching capabilities. This server enables LLMs to retrieve and process content from web pages, converting HTML to markdown for easier consumption.
 
-Presently the server only supports fetching HTML content.
+The fetch tool will truncate the response, but by using the `start_index` argument, you can specify where to start the content extraction. This lets models read a webpage in chunks, until they find the information they need.
 
 ### Available Tools
 
 - `fetch` - Fetches a URL from the internet and extracts its contents as markdown.
+    - `url` (string, required): URL to fetch
+    - `max_length` (integer, optional): Maximum number of characters to return (default: 5000)
+    - `start_index` (integer, optional): Start content from this character index (default: 0)
+    - `raw` (boolean, optional): Get raw content without markdown conversion (default: false)
 
 ### Prompts
 
 - **fetch**
   - Fetch a URL and extract its contents as markdown
-  - Argument: `url` (string, required): URL to fetch
+  - Arguments:
+    - `url` (string, required): URL to fetch
 
 ## Installation
 
-Optionally: Install node.js, this will cause the fetch serve to use a different HTML simplifier that is more robust.
+Optionally: Install node.js, this will cause the fetch server to use a different HTML simplifier that is more robust.
 
 ### Using uv (recommended)