[FEATURE] Support for multiple MCP servers (and loading from config file)

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The problem

Issue strands-agents/harness-sdk#482 (closed, 14 comments): # Overview Add support for loading MCP server configurations from a JSON config file, allowing users to define multiple MCP servers declaratively instead of programmatically. This extends the existing experimental agent_config.py to support an mcp_servers field that creates and manages MCPClient instances automatically. Note: Multiple MCP servers and automatic lifecycle management already work programmatically (see tests_integ/mcp/test_mcp_tool_provider.py::test_mcp_client_multiple_servers). This feature request is specifically about configuration file support.

What fixed it

[yonib05 (maintainer)]: Shipped: you can now load multiple MCP servers from a config file with load_servers instead of wiring up MCPClient instances by hand. It is in both SDKs (Python PR #3053, TypeScript PR #2947). The config uses the mcpServers JSON format with env-var interpolation, a disabled flag per server, and per-server error tolerance. Docs: mount the host path https at container path //strandsagents.com/latest/documentation/docs/user-guide/concepts/tools/mcp-tools/

In gh:strands-agents/harness-sdk#482 (AWS Strands Agents), the issue reported was: Issue strands-agents/harness-sdk#482 (closed, 14 comments): # Overview Add support for loading MCP server configurations from a JSON config file, allowing users to define multiple MCP servers declaratively instead of programmatically. This extends the existing experimental agent_config.py to support an mcp_servers field that creates and manages MCPClient instances automatically. Note: Multiple MCP servers and automatic lifecycle management already work programmatically (see tests_integ/mcp/test_mcp_tool_provider.py::test_mcp_client_multiple_servers). This feature request is specifically about configuration file support. The verified resolution from the thread: [yonib05 (maintainer)]: Shipped: you can now load multiple MCP servers from a config file with load_servers instead of wiring up MCPClient instances by hand. It is in both SDKs (Python PR #3053, TypeScript PR #2947). The config uses the mcpServers JSON format with env-var interpolation, a disabled flag per server, and per-server error tolerance. Docs: mount the host path https at container path //strandsagents.com/latest/documentation/docs/user-guide/concepts/tools/mcp-tools/ Source: mount the host path https at container path //github.com/strands-agents/harness-sdk/issues/482