> ## Documentation Index
> Fetch the complete documentation index at: https://bazel-pr-29804.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# ToolchainContext

Holds toolchains available for a particular exec group. Toolchain targets are accessed by indexing with the toolchain type, as in `ctx.toolchains["//pkg:my_toolchain_type"]`. If the toolchain was optional and no toolchain was resolved, this will return `None`.