Add web-researcher agent with GitHub and Brave Search MCP integration

[Copilot]

Implements a web researcher agent for finding best coding practices via GitHub code search and web search.

Changes

• .github/prompts/web-researcher-agent.md - Agent configuration with MCP server integrations:

  • GitHub MCP (HTTP): Code/repo search via https://api.githubcopilot.com/mcp/
  • Brave Search (STDIO): Web search via @modelcontextprotocol/server-brave-search
  • Workflow instructions for best practices research combining both sources

• .github/prompts/README.md - Usage documentation

Configuration Format

---
name: web-researcher
mcp-servers:
  github:
    type: http
    url: https://api.githubcopilot.com/mcp/
    tools: [search_code, search_repositories, get_file_contents, list_commits]
  brave-search:
    type: stdio
    command: npx
    args: ["-y", "@modelcontextprotocol/server-brave-search"]
    env:
      BRAVE_API_KEY: "${BRAVE_API_KEY}"
    tools: [brave_web_search, brave_local_search]
---

Follows AgentFrontmatter schema from packages/shared/src/types/agent.types.ts.

Original prompt

find for me in web - how I could configure serach agent - that is looking at github, web, finding best coding practices and making reaserach for me - propose MINIMAL change to web-reasearcher agent so I could use it

The user has attached the following file paths as relevant context:

• copilot-instructions.md

Custom agent used: web-researcher
A custom agent that can search the web for current information and provide researched answers with citations

Created from VS Code.

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