Add cli_args/CLIArgs to Python and Go SDKs for cross-SDK consistency

[Copilot]

Python and Go SDKs lacked the CLI arguments pass-through option available in Node.js and .NET, preventing users from passing custom flags to the underlying Copilot CLI process.

Changes

Python SDK (cli_args: list[str])

• Added field to CopilotClientOptions TypedDict
• Arguments prepended before SDK-managed flags in _start_cli_server
• Defensive copy via list() to prevent mutations

Go SDK (CLIArgs []string)

• Added field to ClientOptions struct
• Arguments prepended before SDK-managed flags in startCLIServer
• Defensive copy via append([]string{}, ...) pattern

Documentation

• Updated READMEs for both SDKs

Usage

# Python
client = CopilotClient({
    "cli_args": ["--custom-flag", "--debug-mode"],
    "log_level": "info"
})

// Go
client := copilot.NewClient(&copilot.ClientOptions{
    CLIArgs: []string{"--custom-flag", "--debug-mode"},
    LogLevel: "info",
})

User-provided arguments are inserted before SDK-managed flags like --headless and --no-auto-update, allowing CLI customization while preserving SDK functionality.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/copilot_internal/user
  • Triggering command: /opt/hostedtoolcache/node/22.22.0/x64/bin/node node /home/REDACTED/work/copilot-sdk/copilot-sdk/nodejs/node_modules/@github/copilot/index.js --headless --no-auto-update --log-level info --stdio (http block)
  • Triggering command: /opt/hostedtoolcache/node/22.22.0/x64/bin/node node /home/REDACTED/work/copilot-sdk/copilot-sdk/nodejs/node_modules/@github/copilot/index.js --headless --no-auto-update --log-level info --stdio /usr/local/.ghcu--64 (http block)
  • Triggering command: /opt/hostedtoolcache/node/22.22.0/x64/bin/node node /home/REDACTED/work/copilot-sdk/copilot-sdk/nodejs/node_modules/@github/copilot/index.js --headless --no-auto-update --log-level info --stdio x64/pkg/tool/lin--64 (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Cant pass CLI arguments in python module, despite possible in Node.js module</issue_title>
<issue_description>CopilotClientOptions.cliArgs field in nodejs module is not available in the py module equivalent object. An SDK inconsistency.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Cant pass CLI arguments in python module, despite possible in Node.js module #381

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