[BUG] Remote execution sandbox blocks git clone to github.com, breaking pip install of git+https:// dependencies

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Environment

Claude Code on the web (remote execution sandbox / managed container)
Linux 6.18.5, Python 3.11
HTTPS_PROXY is set; CA bundle at /root/.ccr/ca-bundle.crt
GitHub MCP tools (mcp__github__*) work fine

Summary

Outbound git clone over HTTPS to github.com fails inside the remote sandbox, which breaks pip install for any project that pins a dependency as git+https://github.com/... in pyproject.toml. The HTTPS proxy that the rest of the agent's tooling uses is not picked up by git, so the install fails before the agent can run the project's test suite.

Reproduction

Actual behavior

× git clone --filter=blob:none --quiet https://github.com/vroonhof/ibflex.git /tmp/pip-install-XXXX/ibflex2_... did not run successfully.
│ exit code: 128
╰─> See above for output.

A direct git clone https://github.com/<owner>/<repo>.git from the shell fails the same way (exit 128).

Projects with git-pinned dependencies (common for forks, unreleased patches, or in-house packages) cannot be fully installed in the sandbox. The agent is then forced to either:

Skip running tests entirely, or
Substitute the public PyPI version of the package — which may be a different project with similar name, leading to spurious test failures that look like real regressions.

What Should Happen?

special handling of git installation of python dependencies (or similar for other package managers), there is nothing that different using pypi or another repository,,

Error Messages/Logs

during package install

× git clone --filter=blob:none --quiet https://github.com/vroonhof/ibflex.git /tmp/pip-install-XXXX/ibflex2_... did not run successfully.
│ exit code: 128
╰─> See above for output.

Steps to Reproduce

In a fresh remote session, on a repo whose pyproject.toml contains a git-based dependency, e.g.:

dependencies = [
    "ibflex2 @ git+https://github.com/vroonhof/ibflex.git",
    "pdf417gen @ git+https://github.com/vroonhof/pdf417-py.git",
    ...
]

Run:

pip install -e ".[dev]"

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

claude code web (does not seem advertise version)

Platform

Other

Operating System

Other

Terminal/Shell

Non-interactive/CI environment

Additional Information

_No response_