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+.. taskcluster_caches:
+
+=============
+Common Caches
+=============
+
+There are various caches used by the in-tree tasks. This page attempts to
+document them and their appropriate use.
+
+Version Control Caches
+======================
+
+``level-{{level}}-checkouts-{{version}}``
+   This cache holds version control checkouts, each in a subdirectory named
+   after the repo (e.g., ``gecko``).
+
+   Checkouts should be read-only. If a task needs to create new files from
+   content of a checkout, this content should be written in a separate
+   directory/cache (like a workspace).
+
+   A ``version`` parameter appears in the cache name to allow
+   backwards-incompatible changes to the cache's behavior.
+
+``level-{{level}}-{{project}}-tc-vcs`` (deprecated)
+    This cache is used internally by ``tc-vcs``.  This tool is deprecated and
+    should be replaced with ``hg robustcheckout``.
+
+Workspace Caches
+================
+
+``level-{{level}}-*-workspace``
+   These caches (of various names typically ending with ``workspace``)
+   contain state to be shared between task invocations. Use cases are
+   dependent on the task.
+
+Other
+=====
+
+``tooltool-cache``
+    Tooltool invocations should use this cache.  Tooltool will store files here
+    indexed by their hash, and will verify hashes before copying files from
+    this directory, so there is no concern with sharing the cache between jobs
+    of different levels.