UNABLE_TO_GET_ISSUER_CERT_LOCALLY

[riponbanik]

Describe the bug
Can't work with local proxy certificate. Node environment variable set for internal CA.
export NODE_EXTRA_CA_CERTS="xxx"

To Reproduce
Steps to reproduce the behavior:
Use the block below to create Slack MCP Server
slack_command = "npx -y @modelcontextprotocol/server-slack"
slack_server = MCPServerStdio(
name="Slack MCP Server",
params={
"command": slack_command.split(" ")[0],
"args": slack_command.split(" ")[1:],
"env": {
"SLACK_BOT_TOKEN": os.environ["SLACK_BOT_TOKEN"],
"SLACK_TEAM_ID": os.environ["SLACK_TEAM_ID"],
},
},

Expected behavior
A clear and concise description of what you expected to happen.
Need to have local ca support like below if cant honour systemwide ca cert.

"SLACK_MCP_SERVER_CA": os.environ["NODE_EXTRA_CA_CERTS],
"SLACK_MCP_SERVER_CA_INSECURE": "true"

Logs
Error executing tool: TypeError: fetch failed
at node:internal/deps/undici/undici:13502:13
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
at async SlackClient.getChannelHistory (file:///home/user/.npm/_npx/71b7d53511ff2b57/node_modules/@modelcontextprotocol/server-slack/dist/index.js:236:26)
at async file:///home/user/.npm/_npx/71b7d53511ff2b57/node_modules/@modelcontextprotocol/server-slack/dist/index.js:338:38 {
[cause]: Error: unable to get local issuer certificate
at TLSSocket.onConnectSecure (node:_tls_wrap:1679:34)
at TLSSocket.emit (node:events:518:28)
at TLSSocket._finishInit (node:_tls_wrap:1078:8)
at ssl.onhandshakedone (node:_tls_wrap:864:12) {
code: 'UNABLE_TO_GET_ISSUER_CERT_LOCALLY'
}
}

Additional context
Calling MCP server with OpenAI agent:

async with fs_server as fs, slack_server as slack:

        agent = Agent(
            name="OpenAI Agent w/ MCP Servers",
            instructions="Use the tools to access the filesystem and slack workspaces.",
            mcp_servers=[fs, slack],

        )
        prompt = input("Enter a prompt (MCP servers (fs, slack) are available): ")
        result = await Runner.run(starting_agent=agent, input=prompt)
        print(result.final_output