Resolve env templates in remote MCP server urls

[anticomputer]

Apply swap_env to the url of sse and streamable toolboxes so a remote MCP endpoint can be sourced from the environment.

Why

Stdio toolboxes already env-template their args and env, and both remote transports env-template their headers, but the url was passed to the client verbatim. That meant a toolbox could not do:

server_params:
  kind: streamable
  url: "{{ env('CONTAINER_SHELL_URL') }}"

The literal {{ env(...) }} string reached MCPServerStreamableHttp and the connection failed. This blocks remote toolboxes whose endpoint is only known at runtime, such as a container_shell server reached over an allowlisted host service port.

What

mcp_client_params now runs swap_env(sp.url) for both the sse and streamable branches (guarded for None). Behavior is unchanged for urls without a template.

Tests

Added a parametrized test (streamable and sse) asserting that url: "{{ env('CONTAINER_SHELL_URL') }}" resolves to the concrete endpoint through mcp_client_params. Full suite: 547 passed, 2 skipped.

[Copilot]

Pull request overview

This pull request fixes remote MCP toolbox configuration so url values for sse and streamable transports are env-templated (via swap_env), enabling endpoints to be provided at runtime through environment variables (consistent with existing templating for stdio args/env and remote headers).

Changes:

• Apply swap_env() to server_params["url"] for sse and streamable transports (with a None guard).
• Add a parametrized test covering both streamable and sse URL env-templating resolution.

Show a summary per file

File	Description
src/seclab_taskflow_agent/mcp_utils.py	Env-templates remote MCP url for sse and streamable client params construction.
tests/test_mcp_utils.py	Adds regression test ensuring env-templated remote url resolves for both transports.

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• Review effort level: Low