Search subagent tool description update (#4062)

* change to settings.json to trigger search subagent with proxy

* updated prompt to be more in line with cursor for opus 4.6 issues

extensions/copilot/package.json

@@ -180,7 +180,7 @@
 				"displayName": "%copilot.tools.searchSubagent.name%",
 				"icon": "$(search)",
 				"userDescription": "%copilot.tools.searchSubagent.description%",
-				"modelDescription": "Launch an iterative search-focused subagent that orchestrates semantic_search, grep_search, file_search and read_file tool calls to explore and gather relevant workspace code for a natural language query.\n CALL THIS FOR ANY TASK THAT REQUIRES CODEBASE EXPLORATION!\n\nRemember:\n1. Perform tool calls in parallel whenever possible\n2. Avoid redundant calls -- don't repeat identical searches.\n3. Stop once you have high-confidence, non-duplicative snippets covering the query scope.\n\nReturns: A list of relevant files/snippet locations in the workspace.\n\nInput fields:\n- query: Natural language description of what to search for.\n- description: Short user-visible invocation message. \n- details: 2-3 sentences detailing the objective of the search agent.",
+				"modelDescription": "Launch a fast agent specialized for exploring codebases. Use this when you need to quickly find files by patterns (eg. \"src/components/**/*.tsx\"), search code for keywords (eg. \"API endpoints\"), or answer questions about the codebase (eg. \"how do API endpoints work?\").\nReturns: A list of relevant files/snippet locations in the workspace.\n\nInput fields:\n- query: Natural language description of what to search for.\n- description: Short user-visible invocation message. \n- details: 2-3 sentences detailing the objective of the search agent.",
 				"when": "config.github.copilot.chat.searchSubagent.enabled",
 				"tags": [
 					"vscode_codesearch"