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feat(cpython): drop low-use stdlib modules for agent scripts - #2582
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Agents run python3 for scripted logic (file processing, data transforms). Stop shipping unittest, doctest, profilers, compileall/zipapp, dbm/shelve, plistlib, wave, netrc, cmd, tty/pty and the bz2/lzma/zstd shims (no C codecs in the guest). Stdlib zip 3.58 -> 3.16 MB. Record the workload priority in knowledge.
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What changed
The CPython guest no longer ships stdlib modules that agent scripts rarely use. These are dropped:
unittest,doctest,cProfile,profile,pstats,trace,tabnanny,pyclbr,modulefinder,pickletools,compileall,zipapp.dbm,shelve,plistlib,wave,netrc.cmd,rlcompleter,tty,pty.bz2,lzmaandcompression.zstdshims. Their C codecs were never built, so importing them already failed.concurrent.interpreters.gzip,zipfile(deflate),tarfile(plain/gzip),shutil,xml,csv,jsonandsqlite3are unchanged.breakpoint()still prints a notice and continues.The workload priority is now recorded in knowledge (
runtimes/cpython-wasm.md"Workload priority"). The main use is agents runningpython3for scripted logic such as processing a file. A low-use module needs a concrete agent use case before it is added back.Why
Every shipped module costs crate bytes, and those bytes are the budget for preloading modules that agents actually import.
Before / After
bashkit-cpython-wasm.crate: 8,642,486 → 8,216,210 bytes (cap 10 MiB).import unittest: Before, ~0.2 s per call. After,ModuleNotFoundError.print(1)per call: unchanged.Risk
ModuleNotFoundError. The full list is in L-CPY-009.Checklist
stdlib_is_bytecode_onlyasserts the drops and that gzip/zipfile/tarfile/shutil still import; doctest test replaced bybreakpoint_continues);cargo test --features cpython --test integration cpython: 113 passedGenerated by Claude Code