Support Windows natively - #65
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Windows was unsupported because the implementation depended on Bash, fcntl, and other POSIX behaviour, leaving WSL as the only route -- which is not a Windows install at all, since the agent must also run inside Linux to see the CLI, the skill, and the hook. Stage, review, and setup commands are now planned before they run: a plain program and its arguments are executed directly, and a shell is used only for commands that need one. That removes the hard shell dependency for the common case on every platform, and takes the shell out of the injection surface of the one code path that runs repository-controlled strings. Where a shell is still required on Windows, it is located through the Git installation rather than PATH, because bash.exe on PATH is normally the WSL launcher and would run stages against a different filesystem. The remaining POSIX assumptions are replaced with portable equivalents: an exclusive file lock built on msvcrt where fcntl is absent, explicit UTF-8 for all file and subprocess text, a retry around os.replace for the open-file case POSIX rename permits and Windows does not, and an ACL that restores the owner-only guarantee for copied local-environment files, which os.chmod cannot provide on Windows. Also fixes a bug this work uncovered on POSIX. Git 2.30 through 2.37 predate `merge-tree --write-tree` and report the unknown flag on stderr while exiting zero, so the fallback written for them was never reached and attestation reuse was silently dead on the oldest supported Git versions. The interface is now chosen from the reported Git version rather than by matching an error message, which also survives a locale where Git's messages are translated. Windows joins the pull-request CI matrix rather than a scheduled job: its failures are the ones a contributor on macOS or Linux is least likely to notice before merging. Closes #64 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 10 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThis change adds native Windows support. It introduces direct command execution, Git Bash fallback, portable locking, Windows ACL handling, atomic-write retries, explicit UTF-8 I/O, PowerShell installers, expanded documentation, and Windows CI coverage. ChangesNative Windows support
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🟠 High · up to This PR adds native Windows execution, locking, timeout cleanup, installation removal, and hook handling, but current Windows failure paths can hang store operations or defeat stage timeouts, while uninstall and hook edge cases can produce incorrect or unsafe behavior. Merge should be blocked until these issues are corrected or explicitly accepted. Sequence Diagram(s)sequenceDiagram
participant User
participant PowerShellInstaller
participant UV
participant AgenticPreflightCLI
participant AgentIntegrations
User->>PowerShellInstaller: run install.ps1 with optional agents
PowerShellInstaller->>UV: validate and install Agentic Preflight
UV-->>PowerShellInstaller: Windows launcher path
PowerShellInstaller->>AgenticPreflightCLI: install selected integrations
AgenticPreflightCLI->>AgentIntegrations: write managed skills and hooks
AgentIntegrations-->>User: report installation status
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In `@agentic_preflight/filelock.py`:
- Around line 47-60: Update the Windows branch of _acquire to catch the OSError
as an exception object and retry only when exc.errno equals errno.EDEADLOCK;
immediately re-raise all other OSError instances, preserving the existing
LK_LOCK contention behavior without adding a sleep.
In `@agentic_preflight/hook.py`:
- Around line 148-150: Update the existing-hook handling around path.read_text
in the hook installation flow to read raw bytes and check the ASCII ownership
marker without decoding the entire file, so non-UTF-8 hooks follow the existing
FileExistsError refusal path. Preserve the current behavior for owned hooks and
avoid changing unrelated hook logic.
In `@agentic_preflight/stages/shellstage.py`:
- Around line 166-179: Update _kill_process_tree so the Windows taskkill
subprocess.run call has a bounded timeout and is wrapped to catch OSError,
including FileNotFoundError; on either timeout or OS error, fall back to
process.kill() under the existing suppression, while preserving the current
non-zero-return fallback.
In `@docs/installation.md`:
- Around line 25-26: Update the installation documentation’s platform-parity
statement to acknowledge the Windows-specific uninstall instruction, and in the
later removal section add the PowerShell command .\uninstall.ps1 alongside
./uninstall.sh.
In `@uninstall.ps1`:
- Around line 107-113: Update the uninstall flow after both native commands,
“integrations uninstall” and “uv tool uninstall agentic-preflight,” to check
$LASTEXITCODE immediately and exit with the failure code when nonzero. Only
continue to CLI removal or print the final success message when the preceding
command succeeds.
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.github/workflows/ci.yml.github/workflows/release.yml.github/workflows/test.ymlCHANGELOG.mdCOMPATIBILITY.mdREADME.mdagentic_preflight/cli.pyagentic_preflight/cli_policy.pyagentic_preflight/cli_runs.pyagentic_preflight/filelock.pyagentic_preflight/fileperms.pyagentic_preflight/findings.pyagentic_preflight/gitx.pyagentic_preflight/hook.pyagentic_preflight/initcmd.pyagentic_preflight/integrations.pyagentic_preflight/runs/review_executor.pyagentic_preflight/runs/stages.pyagentic_preflight/stages/command.pyagentic_preflight/stages/detect.pyagentic_preflight/stages/shellstage.pyagentic_preflight/store.pyagentic_preflight/worktree.pydocs/installation.mdinstall.ps1pyproject.tomltests/conftest.pytests/driver.pytests/test_atomic_write.pytests/test_cli_m0.pytests/test_command_plan.pytests/test_diff.pytests/test_docs_match_cli.pytests/test_encoding.pytests/test_filelock.pytests/test_findings.pytests/test_gitx.pytests/test_governance.pytests/test_hook.pytests/test_install_script.pytests/test_install_script_windows.pytests/test_integrations.pytests/test_invariants.pytests/test_mergeback.pytests/test_rebase_tolerance.pytests/test_review_executor.pytests/test_shell_stages.pytests/test_store.pytests/test_sync.pytests/test_worktree.pyuninstall.ps1
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Windows CI caught what local checks could not: a type checker resolves the standard library for the platform it runs on, so `os.getpgid`, `os.killpg`, and `signal.SIGKILL` do not exist when checking on Windows. Branching on a runtime flag inside one function left the POSIX calls visible to that check. Both `_process_group_kwargs` and `_kill_process_tree` are now defined under a `sys.platform` guard, so each body is only ever checked against the library it actually uses. That removes the patchable WINDOWS flag, so neither kill path can be forced on the other platform; each is instead covered by the CI leg that really runs it, which is a more honest test than mocking the whole platform. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Windows CI found a real hole in the owner-only guarantee. `/inheritance:r` removes only *inherited* access entries, and `/grant:r` replaces only the principal it names. A file whose access list came from the creating process's default token rather than from its parent directory carries SYSTEM, Administrators, and OWNER RIGHTS as *explicit* entries, and neither option touched them: the copied `.env` stayed readable by all three. That is how GitHub's Windows runners create a file, and how any machine does when the parent grants nothing inheritable. Resetting the access list first discards the explicit entries, so the following two options land on the empty list they assume. The tests now target `restrict_to_owner` directly rather than going through `copy_files`. `shutil.copy2` does not carry a Windows access list across, so a test written at that level always starts from a freshly inherited one and cannot reproduce the case that failed -- which is why the first version of this test passed against the bug it was written for. Also splits the symlink capability probe in two. Creating a symlink and having git *record* it as one are different questions: Git for Windows stores a symlink as an ordinary file unless configured otherwise, so the runner could make the link but committed no file-type change for the diff tests to see. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Whether git records a symlink as a symlink is decided per repository and per platform, so the module-level probe answers only whether it can, not whether it did for the file a given test depends on. A type-change test whose base is stored as an ordinary file finds no type change and reports a confusing count instead of the reason. Both diff tests now assert the mode git actually stored, and skip with that mode in the message when it is not a symlink. The requirement is stated where it is relied on, and a skip carries its own explanation. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The previous check confirmed the base side was stored as a symlink, and the test still found one patch where it expected two -- so the missing piece was the other side. Windows ignores file modes by default, and replacing a recorded symlink with a plain file is then a change of content rather than of type. Both diff tests now compare the mode git stored on each side and skip, naming those modes, when they match. That is the invariant the tests actually depend on, and it holds whichever of the several settings involved is responsible. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Five issues raised in review, each verified against the code and each real. Two are regressions introduced by this branch. `filelock` retried every `OSError` from `msvcrt.locking`. Only contention, reported as EDEADLOCK after the call's own bounded wait, resolves by trying again; a bad descriptor or a permission failure would still be true next time, so retrying turned a permanent error into an unkillable loop at full CPU instead of an exception naming the cause. `hook.install` decoded an existing hook as UTF-8 before looking for the ownership marker, so somebody else's hook containing non-UTF-8 bytes raised `UnicodeDecodeError` instead of taking the documented refusal path. The marker is ASCII, so the comparison is done on bytes. This was introduced with the encoding pass on this branch. The Windows timeout kill ran `taskkill` with no timeout and no protection: a missing `taskkill` raised out of `run_stage`, replacing the timed-out result with a crash and skipping the fallback that kills the child directly, and a wedged one would have meant the stage timeout bounded nothing. Every failure now reaches the same fallback. `uninstall.ps1` set `$ErrorActionPreference`, which does not govern native commands -- they report failure through `$LASTEXITCODE` and the script carries on. A failed skill removal was still followed by removing the CLI that performs it, taking away the only way to retry, and a failed CLI removal still printed success. The installation guide claimed everything after the install step was identical across platforms while the uninstall section offered only the Bash script. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Two ways direct execution could run something other than the configured command, both verified against the real behaviour before and after. A bare program name was resolved with `shutil.which`, which on Windows searches the calling process's current directory before PATH. That directory is the repository under validation, so a checked-in `pytest.exe` or `ruff.bat` would have run in place of the real tool -- in the one component whose job is to validate that repository. Passing `path=` does not suppress it: the directory is inserted after the supplied path is split. Whether it happens at all depends on an environment variable and on the Python version, which is no basis for deciding what gets executed. Bare names are now looked up on PATH and nowhere else, which is also what a shell did here before and what `execvp` does on POSIX. Returning an absolute path stops `CreateProcess` searching afterwards. Inside double quotes, a shell drops a backslash before `$`, a backtick, a quote, or another backslash, and keeps it otherwise; `shlex` keeps it in every case. `pytest -k "cost\$"` was judged shell-free and then executed with `cost\$` where a shell would have passed `cost$`. Such a command now falls back to the shell. Unquoted escapes are unaffected, the two agree there, and on Windows a backslash remains a path separator, so quoted paths still execute directly. Also documents the login-shell consequence properly. The earlier note understated it: the case that matters is not a missing environment variable but a program present both with and without the profile, where a version manager would have selected a different build of it. That now has its own section in COMPATIBILITY.md, with the three cases separated and the fix -- name the interpreter in the command -- spelled out. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…ectory Review findings from a second pass over the branch: - run_stage and run_setup catch OSError from direct execution — a script with no shebang, a non-executable format, or a program deleted since planning — and return the EXIT_UNRUNNABLE result instead of crashing. - The Windows bash discovery resolves git and bash with resolve_on_path rather than shutil.which, and taskkill/whoami/icacls are invoked by absolute System32 paths, so the repository under validation cannot supply the shell or the ACL tool through a current-directory search. - find_shell probes for bash then sh on POSIX instead of assuming bash, so a bash-less host gets the documented ShellUnavailable red stage. - The non-ASCII findings test round-trips a real Finding; make_run is shared from conftest; the duplicated TimedOutProcess fake is gone; the symlink probes run lazily and cached instead of at every collection. - RELEASING.md now includes re-pinning the README's blob/vX.Y.Z links, which is the step that makes the Windows claims match the linked docs.
The checklist predated windows-latest joining ci.yml and release.yml: it named ubuntu-latest alone for pull requests and pushes, six supported combinations for the manual pre-release run, and Ubuntu and macOS for the tag matrix. All three counts now include Windows.
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Closes #64.
Makes Windows 10+ a natively supported platform, alongside macOS and Linux. No WSL.
ruff check,ruff format --check,mypyclean; coverage 89.5%Argv-first stage execution
[commands] lint = "ruff check ."was stored as an opaque shell string and handedto
bash -lc, which is what made a POSIX shell a hard dependency.Commands are now planned before they run (
agentic_preflight/stages/command.py).If a command contains no shell grammar and names a resolvable program, it is executed
directly as an argv on every platform. A shell is used only for commands that need
one: pipes,
&&, redirection, globs, expansions, a leading variable assignment, or ashell builtin. Detection is deliberately conservative — a false "needs a shell" costs
a subprocess, while a false "safe to split" would silently run a different command
than the repository configured.
Every command the stage detector generates from
pyproject.toml,package.json,justfile, andMakefilefalls in the direct group, so most repositories need noshell at all. Two side benefits: the shell leaves the injection surface of the one
code path that runs repository-controlled strings, and there is no longer an
intermediate shell process between the timeout and the program whose exit code
decides the stage.
Where a shell is required on Windows, it is located through the Git installation
rather than
PATH. A default Windows 11 install puts the WSL launcher atC:\Windows\System32\bash.exe; running a stage through it would execute the commandinside a Linux distribution against a different filesystem.
Splitting is also platform-aware. POSIX word-splitting always treats a backslash as an
escape, which turns an unquoted
C:\Users\me\tool.exeintoC:Usersmetool.exe— adifferent program, chosen silently. Backslash is kept literal on Windows, and where
the two conventions genuinely disagree (a backslash-escaped quote) the string is
handed to a shell rather than guessed at.
Behaviour change worth calling out. A directly executed command does not source
your shell profile, where
bash -lcdid. A command whose program is only onPATHvia
~/.profilestill resolves through the shell fallback and is unaffected, but astage that relied on a profile also exporting environment now runs without it. It
fails visibly rather than silently, and matches how the same command behaves in CI.
Remaining POSIX assumptions
agentic_preflight/filelock.py.fcntl.flockon POSIX; amsvcrtbyte-range lock on Windows, driven in a loop because its "blocking" mode gives up
after about ten seconds. Tested with real subprocesses, since an in-process test
would pass on a lock that does not actually cross a process boundary.
use Unix line endings. Under the Windows default of
cp1252,café.txtarrived ascafé.txtfrom git, and a non-ASCII path on stderr raisedUnicodeEncodeError.The pre-push hook in particular must be LF: git runs it with its own
sh, and aCRLF shebang makes the interpreter unfindable.
os.replaceis retried with backoff on Windows, where a readerholding the file open blocks a replace that POSIX
renamewould permit. The finalattempt is unguarded, so a genuinely stuck file surfaces as an error rather than a
lost write. This fixes a transient hold, which is the one that occurs; a process
holding the handle indefinitely still blocks, and Python's
openoffers no way torequest the share-delete access that would fix it.
agentic_preflight/fileperms.py.[worktree] copy_filesnarrows copies to0o600so a copied.envis not a second, lessprotected location for a secret.
os.chmoddoes not affect permissions on Windows,so the copy silently inherited the directory's ACEs. Now stripped to a single ACE
for the calling user's SID via
icacls. A copy that cannot be restricted is deletedand refused rather than left readable.
stage kills the parent/child tree with
taskkill /T.CREATE_NEW_PROCESS_GROUPonly scopes console events, which a non-console child never receives.
An unrelated bug this uncovered
test_start_preserves_green_when_the_attested_head_already_contains_the_fresh_basefailed on Linux and passed on Windows — same Python, different Git.
merge-tree --write-treelanded in Git 2.38. A fallback existed for 2.30–2.37 anddetected them by exit code 129 or an
unknown optionmessage. What Git 2.34 actuallydoes is print
fatal: unknown rev --write-treeto stderr and exit zero. No failureto detect, and the wrong message, so the fallback written for those versions never ran
on them.
merge_treereturned "no clean merge" for every comparison, andstartsilently reopened review instead of reusing a still-valid green attestation.
The interface is now chosen from the reported Git version rather than by recognising
an error message — which also stops the detection breaking under a locale where Git's
messages are translated. Message matching is kept as a secondary signal only.
No CI leg would have caught this: the Ubuntu runner ships a modern Git, and the
scheduled macOS regression pins an old Python rather than an old Git.
Installers, CI, and policy
install.ps1/uninstall.ps1, mirroring the bash pair including the deliberatepause before uninstalling so repository state can be cleaned up while the skill
still exists.
tests/test_install_script_windows.pymirrors the bash installertests assertion for assertion, plus one platform-independent test asserting all four
scripts offer every supported integration.
ones a contributor on macOS or Linux is least likely to notice. That required
pinning the coverage-badge step to
runner.os == 'Linux', replacing a fragileinvariant ("ci.yml passes a single combination on push") that adding Windows would
have broken into a duplicate-artifact error.
COMPATIBILITY.md, the README,docs/installation.md, and the package classifiersare updated. Two caveats are stated plainly: shell-grammar commands need Git Bash,
and symlinks need Developer Mode.
Test-suite changes
Two of these were real defects, not portability noise:
test_integrationsandtest_rebase_toleranceset onlyHOME, butPath.home()readsUSERPROFILEonWindows — so on Windows those tests were installing skills into the developer's real
home directory and asserting against whatever was already there.
The rest: symlink and
chmodtests are marked (symlink support is probed, notinferred from platform, since Developer Mode decides), and the
pwd-based tests nowuse
git rev-parse --show-toplevel, becausepwdis a shell builtin reporting aPOSIX path under Git Bash.
14 tests skip on Windows and 8 on Linux; each skip is a genuine platform capability
difference with a stated reason, and both kill paths keep dedicated tests so neither
branch loses coverage.
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New Features
Bug Fixes
Documentation