langchain-ai/langgraph · error · ValueError

Invalid build tool: {pack}; must be one of {', '.join(_BUILD

Error message

Invalid build tool: {pack}; must be one of {', '.join(_BUILD_TOOLS)}

What it means

Error "Invalid build tool: {pack}; must be one of {', '.join(_BUILD_TOOLS)}" thrown in langchain-ai/langgraph.

Source

Thrown at libs/cli/langgraph_cli/config.py:106

def _get_pip_cleanup_lines(
    install_cmd: str,
    to_uninstall: tuple[str] | None,
    pip_installer: Literal["uv", "pip"],
) -> str:
    commands = [
        f"""# -- Ensure user deps didn't inadvertently overwrite langgraph-api
RUN mkdir -p /api/langgraph_api /api/langgraph_runtime /api/langgraph_license && \
touch /api/langgraph_api/__init__.py /api/langgraph_runtime/__init__.py /api/langgraph_license/__init__.py
RUN PYTHONDONTWRITEBYTECODE=1 {install_cmd} --no-cache-dir --no-deps -e /api
# -- End of ensuring user deps didn't inadvertently overwrite langgraph-api --
# -- Removing build deps from the final image ~<:===~~~ --"""
    ]
    if to_uninstall:
        for pack in to_uninstall:
            if pack not in _BUILD_TOOLS:
                raise ValueError(
                    f"Invalid build tool: {pack}; must be one of {', '.join(_BUILD_TOOLS)}"
                )
        packs_str = " ".join(sorted(to_uninstall))
        commands.append(f"RUN pip uninstall -y {packs_str}")
        # Ensure the directories are removed entirely
        packages_rm = " ".join(
            f"/usr/local/lib/python*/site-packages/{pack}*" for pack in to_uninstall
        )
        if "pip" in to_uninstall:
            packages_rm += ' && find /usr/local/bin -name "pip*" -delete || true'
        commands.append(f"RUN rm -rf {packages_rm}")
        wolfi_packages_rm = " ".join(
            f"/usr/lib/python*/site-packages/{pack}*" for pack in to_uninstall
        )
        if "pip" in to_uninstall:
            wolfi_packages_rm += ' && find /usr/bin -name "pip*" -delete || true'
        commands.append(f"RUN rm -rf {wolfi_packages_rm}")
        if pip_installer == "uv":

View on GitHub (pinned to 38031739e5)

When it happens

Trigger: Thrown at libs/cli/langgraph_cli/config.py:106 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of langchain-ai/langgraph@38031739e5 (2026-08-26). Data as JSON: /api/errors/44c2891cf19fc5b6. Report an issue: GitHub.