[{"data":1,"prerenderedAt":1978},["ShallowReactive",2],{"page-\u002Fproject-setup-dependency-management\u002Fpre-commit-hooks-for-cli-projects\u002Fspeeding-up-slow-pre-commit-hooks\u002F":3,"content-directory":1134},{"id":4,"title":5,"body":6,"date":1120,"description":1121,"difficulty":1122,"draft":1123,"extension":1124,"meta":1125,"navigation":314,"path":1126,"seo":1127,"stem":1128,"tags":1129,"updated":1120,"__hash__":1133},"content\u002Fproject-setup-dependency-management\u002Fpre-commit-hooks-for-cli-projects\u002Fspeeding-up-slow-pre-commit-hooks\u002Findex.md","Speeding Up Slow pre-commit Hooks in a CLI Repository",{"type":7,"value":8,"toc":1099},"minimark",[9,24,29,47,51,57,102,110,113,117,121,126,133,234,258,262,276,551,588,591,595,630,641,645,660,664,684,688,735,738,742,745,988,991,995,1018,1022,1026,1032,1036,1043,1047,1053,1057,1060,1064,1095],[10,11,12,13,17,18,23],"p",{},"A pre-commit setup has a time budget, and it is short. When a commit takes two seconds, nobody notices. When it takes twenty, people start typing ",[14,15,16],"code",{},"git commit --no-verify",", and the hooks protect nothing. Slow pre-commit runs usually have a handful of causes — a type checker run over the whole project on every commit, hooks scanning files they do not care about, a hook environment rebuilt more often than necessary, or a single test-running hook someone added in a moment of enthusiasm. Each has a targeted fix. This guide measures where the time goes, applies those fixes to a Python CLI repository, and shows how to keep the checks that are too slow for every commit without losing them. It belongs to the ",[19,20,22],"a",{"href":21},"\u002Fproject-setup-dependency-management\u002Fpre-commit-hooks-for-cli-projects\u002F","pre-commit topic",".",[25,26,28],"h2",{"id":27},"prerequisites","Prerequisites",[30,31,32,44],"ul",{},[33,34,35,36,39,40,23],"li",{},"A working ",[14,37,38],{},".pre-commit-config.yaml",", such as the one from ",[19,41,43],{"href":42},"\u002Fproject-setup-dependency-management\u002Fpre-commit-hooks-for-cli-projects\u002Fsetting-up-pre-commit-for-python-cli-repos\u002F","setting up pre-commit for Python CLI repos",[33,45,46],{},"pre-commit 3.x or 4.x.",[25,48,50],{"id":49},"measure-first","Measure first",[10,52,53,56],{},[14,54,55],{},"--verbose"," prints each hook's duration, which is all the profiling you need:",[58,59,64],"pre",{"className":60,"code":61,"language":62,"meta":63,"style":63},"language-bash shiki shiki-themes github-light github-dark","pre-commit run --all-files --verbose 2>&1 | grep -E \"^\\S.*\\.{3}|duration\"\n","bash","",[14,65,66],{"__ignoreMap":63},[67,68,71,75,79,83,86,90,93,96,99],"span",{"class":69,"line":70},"line",1,[67,72,74],{"class":73},"sScJk","pre-commit",[67,76,78],{"class":77},"sZZnC"," run",[67,80,82],{"class":81},"sj4cs"," --all-files",[67,84,85],{"class":81}," --verbose",[67,87,89],{"class":88},"szBVR"," 2>&1",[67,91,92],{"class":88}," |",[67,94,95],{"class":73}," grep",[67,97,98],{"class":81}," -E",[67,100,101],{"class":77}," \"^\\S.*\\.{3}|duration\"\n",[58,103,108],{"className":104,"code":106,"language":107,"meta":63},[105],"language-text","ruff check...............................................................Passed\n- duration: 0.01s\nruff format..............................................................Passed\n- duration: 0.01s\nmypy.....................................................................Passed\n- duration: 6.84s\npytest (fast).............................................................Passed\n- duration: 11.2s\n","text",[14,109,106],{"__ignoreMap":63},[10,111,112],{},"Run it twice: the first run after a change of hook versions includes building hook environments, which is a one-off cost; the second shows the steady state your colleagues live with. In almost every Python repository, the list is dominated by one or two hooks — usually the type checker and anything that runs tests.",[114,115],"inline-diagram",{"name":116},"pcspeed-durations",[25,118,120],{"id":119},"the-recipe","The recipe",[122,123,125],"h3",{"id":124},"_1-run-hooks-only-on-files-they-care-about","1. Run hooks only on files they care about",[10,127,128,129,132],{},"pre-commit passes each hook the staged files that match its filters. Hooks from good repositories set ",[14,130,131],{},"types: [python]"," already; local hooks often forget, and then run on every Markdown and YAML change too:",[58,134,138],{"className":135,"code":136,"language":137,"meta":63,"style":63},"language-yaml shiki shiki-themes github-light github-dark","  - repo: local\n    hooks:\n      - id: cli-reference\n        name: CLI reference is up to date\n        entry: uv run python scripts\u002Fgen_cli_reference.py --check\n        language: system\n        files: ^src\u002Fmytool\u002F(cli|commands)\u002F.*\\.py$\n        pass_filenames: false\n","yaml",[14,139,140,156,165,179,190,201,212,223],{"__ignoreMap":63},[67,141,142,146,150,153],{"class":69,"line":70},[67,143,145],{"class":144},"sVt8B","  - ",[67,147,149],{"class":148},"s9eBZ","repo",[67,151,152],{"class":144},": ",[67,154,155],{"class":77},"local\n",[67,157,159,162],{"class":69,"line":158},2,[67,160,161],{"class":148},"    hooks",[67,163,164],{"class":144},":\n",[67,166,168,171,174,176],{"class":69,"line":167},3,[67,169,170],{"class":144},"      - ",[67,172,173],{"class":148},"id",[67,175,152],{"class":144},[67,177,178],{"class":77},"cli-reference\n",[67,180,182,185,187],{"class":69,"line":181},4,[67,183,184],{"class":148},"        name",[67,186,152],{"class":144},[67,188,189],{"class":77},"CLI reference is up to date\n",[67,191,193,196,198],{"class":69,"line":192},5,[67,194,195],{"class":148},"        entry",[67,197,152],{"class":144},[67,199,200],{"class":77},"uv run python scripts\u002Fgen_cli_reference.py --check\n",[67,202,204,207,209],{"class":69,"line":203},6,[67,205,206],{"class":148},"        language",[67,208,152],{"class":144},[67,210,211],{"class":77},"system\n",[67,213,215,218,220],{"class":69,"line":214},7,[67,216,217],{"class":148},"        files",[67,219,152],{"class":144},[67,221,222],{"class":77},"^src\u002Fmytool\u002F(cli|commands)\u002F.*\\.py$\n",[67,224,226,229,231],{"class":69,"line":225},8,[67,227,228],{"class":148},"        pass_filenames",[67,230,152],{"class":144},[67,232,233],{"class":81},"false\n",[10,235,236,239,240,243,244,247,248,251,252,254,255,257],{},[14,237,238],{},"files"," (a regular expression), ",[14,241,242],{},"types","\u002F",[14,245,246],{},"types_or"," (file kinds pre-commit detects) and ",[14,249,250],{},"exclude"," decide when a hook runs at all. A hook whose ",[14,253,238],{}," pattern matches nothing in the commit is skipped instantly. Add a top-level ",[14,256,250],{}," for vendored code, generated files and fixtures, so no hook wastes time on them.",[122,259,261],{"id":260},"_2-move-slow-checks-to-a-later-stage","2. Move slow checks to a later stage",[10,263,264,265,267,268,271,272,275],{},"Not every check must run on every commit. pre-commit supports several stages; the useful ones are ",[14,266,74],{}," (the default), ",[14,269,270],{},"pre-push"," (when pushing — once per batch of commits) and ",[14,273,274],{},"manual"," (only when asked, typically in CI):",[58,277,279],{"className":135,"code":278,"language":137,"meta":63,"style":63},"default_install_hook_types: [pre-commit, pre-push]\ndefault_stages: [pre-commit]\n\nrepos:\n  - repo: https:\u002F\u002Fgithub.com\u002Fastral-sh\u002Fruff-pre-commit\n    rev: v0.16.10\n    hooks:\n      - id: ruff-check\n        args: [--fix]\n      - id: ruff-format\n  - repo: local\n    hooks:\n      - id: mypy\n        name: mypy\n        entry: uv run mypy\n        language: system\n        types: [python]\n        require_serial: true\n        stages: [pre-push]\n      - id: pytest-fast\n        name: fast tests\n        entry: uv run pytest -q -m \"not slow\" -x\n        language: system\n        pass_filenames: false\n        always_run: true\n        stages: [manual]\n",[14,280,281,299,310,316,323,334,344,350,361,374,386,397,404,416,425,435,444,457,468,480,492,502,512,521,530,540],{"__ignoreMap":63},[67,282,283,286,289,291,294,296],{"class":69,"line":70},[67,284,285],{"class":148},"default_install_hook_types",[67,287,288],{"class":144},": [",[67,290,74],{"class":77},[67,292,293],{"class":144},", ",[67,295,270],{"class":77},[67,297,298],{"class":144},"]\n",[67,300,301,304,306,308],{"class":69,"line":158},[67,302,303],{"class":148},"default_stages",[67,305,288],{"class":144},[67,307,74],{"class":77},[67,309,298],{"class":144},[67,311,312],{"class":69,"line":167},[67,313,315],{"emptyLinePlaceholder":314},true,"\n",[67,317,318,321],{"class":69,"line":181},[67,319,320],{"class":148},"repos",[67,322,164],{"class":144},[67,324,325,327,329,331],{"class":69,"line":192},[67,326,145],{"class":144},[67,328,149],{"class":148},[67,330,152],{"class":144},[67,332,333],{"class":77},"https:\u002F\u002Fgithub.com\u002Fastral-sh\u002Fruff-pre-commit\n",[67,335,336,339,341],{"class":69,"line":203},[67,337,338],{"class":148},"    rev",[67,340,152],{"class":144},[67,342,343],{"class":77},"v0.16.10\n",[67,345,346,348],{"class":69,"line":214},[67,347,161],{"class":148},[67,349,164],{"class":144},[67,351,352,354,356,358],{"class":69,"line":225},[67,353,170],{"class":144},[67,355,173],{"class":148},[67,357,152],{"class":144},[67,359,360],{"class":77},"ruff-check\n",[67,362,364,367,369,372],{"class":69,"line":363},9,[67,365,366],{"class":148},"        args",[67,368,288],{"class":144},[67,370,371],{"class":77},"--fix",[67,373,298],{"class":144},[67,375,377,379,381,383],{"class":69,"line":376},10,[67,378,170],{"class":144},[67,380,173],{"class":148},[67,382,152],{"class":144},[67,384,385],{"class":77},"ruff-format\n",[67,387,389,391,393,395],{"class":69,"line":388},11,[67,390,145],{"class":144},[67,392,149],{"class":148},[67,394,152],{"class":144},[67,396,155],{"class":77},[67,398,400,402],{"class":69,"line":399},12,[67,401,161],{"class":148},[67,403,164],{"class":144},[67,405,407,409,411,413],{"class":69,"line":406},13,[67,408,170],{"class":144},[67,410,173],{"class":148},[67,412,152],{"class":144},[67,414,415],{"class":77},"mypy\n",[67,417,419,421,423],{"class":69,"line":418},14,[67,420,184],{"class":148},[67,422,152],{"class":144},[67,424,415],{"class":77},[67,426,428,430,432],{"class":69,"line":427},15,[67,429,195],{"class":148},[67,431,152],{"class":144},[67,433,434],{"class":77},"uv run mypy\n",[67,436,438,440,442],{"class":69,"line":437},16,[67,439,206],{"class":148},[67,441,152],{"class":144},[67,443,211],{"class":77},[67,445,447,450,452,455],{"class":69,"line":446},17,[67,448,449],{"class":148},"        types",[67,451,288],{"class":144},[67,453,454],{"class":77},"python",[67,456,298],{"class":144},[67,458,460,463,465],{"class":69,"line":459},18,[67,461,462],{"class":148},"        require_serial",[67,464,152],{"class":144},[67,466,467],{"class":81},"true\n",[67,469,471,474,476,478],{"class":69,"line":470},19,[67,472,473],{"class":148},"        stages",[67,475,288],{"class":144},[67,477,270],{"class":77},[67,479,298],{"class":144},[67,481,483,485,487,489],{"class":69,"line":482},20,[67,484,170],{"class":144},[67,486,173],{"class":148},[67,488,152],{"class":144},[67,490,491],{"class":77},"pytest-fast\n",[67,493,495,497,499],{"class":69,"line":494},21,[67,496,184],{"class":148},[67,498,152],{"class":144},[67,500,501],{"class":77},"fast tests\n",[67,503,505,507,509],{"class":69,"line":504},22,[67,506,195],{"class":148},[67,508,152],{"class":144},[67,510,511],{"class":77},"uv run pytest -q -m \"not slow\" -x\n",[67,513,515,517,519],{"class":69,"line":514},23,[67,516,206],{"class":148},[67,518,152],{"class":144},[67,520,211],{"class":77},[67,522,524,526,528],{"class":69,"line":523},24,[67,525,228],{"class":148},[67,527,152],{"class":144},[67,529,233],{"class":81},[67,531,533,536,538],{"class":69,"line":532},25,[67,534,535],{"class":148},"        always_run",[67,537,152],{"class":144},[67,539,467],{"class":81},[67,541,543,545,547,549],{"class":69,"line":542},26,[67,544,473],{"class":148},[67,546,288],{"class":144},[67,548,274],{"class":77},[67,550,298],{"class":144},[10,552,553,554,556,557,559,560,564,565,567,568,571,572,574,575,578,579,583,584,587],{},"Ruff stays on every commit — it takes milliseconds and fixes most of what it finds. mypy moves to ",[14,555,270],{},", where a few seconds once per push is acceptable. Tests move to ",[14,558,274],{},", run by CI as described in ",[19,561,563],{"href":562},"\u002Fproject-setup-dependency-management\u002Fpre-commit-hooks-for-cli-projects\u002Frunning-pre-commit-in-ci\u002F","running pre-commit in CI"," and by developers on demand. ",[14,566,285],{}," makes ",[14,569,570],{},"pre-commit install"," set up both the commit and push hooks, so nobody has to remember the second command. ",[14,573,303],{}," matters just as much: a hook without its own ",[14,576,577],{},"stages"," key runs in ",[580,581,582],"em",{},"every"," stage, so without it Ruff would run a second time on every push, alongside mypy. With ",[14,585,586],{},"default_stages: [pre-commit]",", unmarked hooks run on commit only, and the push runs just the checks that were moved there.",[114,589],{"name":590},"pcspeed-stages",[122,592,594],{"id":593},"_3-fix-the-mypy-hook","3. Fix the mypy hook",[10,596,597,598,601,602,605,606,609,610,613,614,617,618,621,622,625,626,629],{},"The popular ",[14,599,600],{},"mirrors-mypy"," hook runs mypy in an isolated environment that contains only mypy — not your project's dependencies. mypy then cannot see Typer, httpx or Rich, treats them as ",[14,603,604],{},"Any"," (or reports missing imports), and you add a growing list of ",[14,607,608],{},"additional_dependencies"," that drifts from your lock file. It is slower ",[580,611,612],{},"and"," less accurate. A ",[14,615,616],{},"local"," hook with ",[14,619,620],{},"language: system"," and ",[14,623,624],{},"entry: uv run mypy"," uses the project's own environment instead, so mypy sees exactly the dependency versions you test with, and its incremental cache in ",[14,627,628],{},".mypy_cache"," is shared with your editor and normal runs.",[10,631,632,633,636,637,640],{},"Two settings matter for whole-project tools. ",[14,634,635],{},"require_serial: true"," stops pre-commit splitting the file list across parallel processes, which would make mypy run several times with partial views of the code. And for checkers that should always analyse the whole package regardless of which files changed, set ",[14,638,639],{},"pass_filenames: false"," and let the tool's own configuration decide what to check.",[122,642,644],{"id":643},"_4-keep-environments-warm","4. Keep environments warm",[10,646,647,648,651,652,655,656,659],{},"pre-commit builds one environment per hook repository and revision, cached in ",[14,649,650],{},"~\u002F.cache\u002Fpre-commit",". Rebuilds happen when a ",[14,653,654],{},"rev"," changes or the cache is cleared — slow, but rare. Avoid making them frequent: do not reference ",[14,657,658],{},"rev: main"," or other moving targets (pre-commit re-clones them), and batch hook version updates rather than updating one hook a day. In CI, cache that directory keyed on the config file.",[122,661,663],{"id":662},"_5-try-prek","5. Try prek",[10,665,666,672,673,675,676,679,680,683],{},[19,667,671],{"href":668,"rel":669},"https:\u002F\u002Fgithub.com\u002Fj178\u002Fprek",[670],"nofollow","prek"," is a reimplementation of pre-commit in Rust that reads the same ",[14,674,38],{},", installs hook environments with uv and runs hooks in parallel where it can. On a small test repository, a cold run (building the Ruff environment) took about 1.7 s with prek against 2.5 s with pre-commit, and warm runs were 0.05 s against 0.14 s. The difference is small for a few fast hooks and grows with the number of Python-based hook repositories. Because the configuration is shared, a team can try it without changing anything else: ",[14,677,678],{},"uvx prek install"," replaces the git hook, and ",[14,681,682],{},"uvx pre-commit install"," puts the original back.",[25,685,687],{"id":686},"ux-considerations","UX considerations",[30,689,690,697,703,713,726],{},[33,691,692,696],{},[693,694,695],"strong",{},"Set a budget and say it out loud."," \"Commit hooks finish in under two seconds; anything slower goes to pre-push or CI\" turns an argument into a rule.",[33,698,699,702],{},[693,700,701],{},"Auto-fix on commit, check on push."," Formatters and import sorters that fix files are pleasant on commit; checks that only report are better later, when the developer is ready to look.",[33,704,705,708,709,712],{},[693,706,707],{},"Fail fast for expensive hooks."," ",[14,710,711],{},"fail_fast: true"," at the top of the config stops at the first failing hook, which saves time when a formatter has already reported problems.",[33,714,715,708,718,721,722,725],{},[693,716,717],{},"Make the escape hatch specific.",[14,719,720],{},"SKIP=mypy git push"," skips one hook for one push; ",[14,723,724],{},"--no-verify"," skips everything. Document the former.",[33,727,728,731,732,734],{},[693,729,730],{},"Keep CI as the safety net."," Moving a check to ",[14,733,274],{}," is only safe if CI runs it on every pull request.",[114,736],{"name":737},"pcspeed-terminal",[25,739,741],{"id":740},"testing-the-behaviour","Testing the behaviour",[10,743,744],{},"Speed regressions creep in one hook at a time, so make the budget a check. A small script runs the commit-stage hooks against every file and fails if they exceed the budget:",[58,746,749],{"className":747,"code":748,"language":454,"meta":63,"style":63},"language-python shiki shiki-themes github-light github-dark","# scripts\u002Fcheck_hook_budget.py\nimport subprocess\nimport sys\nimport time\n\nBUDGET_SECONDS = 5.0\n\nstart = time.monotonic()\nresult = subprocess.run([\"pre-commit\", \"run\", \"--all-files\", \"--hook-stage\", \"pre-commit\"],\n                        capture_output=True, text=True)\nelapsed = time.monotonic() - start\nprint(result.stdout)\nif elapsed > BUDGET_SECONDS:\n    sys.exit(f\"pre-commit stage took {elapsed:.1f}s, budget is {BUDGET_SECONDS:.0f}s; \"\n             \"move slow hooks to pre-push or manual\")\nprint(f\"pre-commit stage took {elapsed:.1f}s (budget {BUDGET_SECONDS:.0f}s)\")\nsys.exit(result.returncode)\n",[14,750,751,757,765,772,779,783,794,798,809,844,866,882,890,906,943,950,983],{"__ignoreMap":63},[67,752,753],{"class":69,"line":70},[67,754,756],{"class":755},"sJ8bj","# scripts\u002Fcheck_hook_budget.py\n",[67,758,759,762],{"class":69,"line":158},[67,760,761],{"class":88},"import",[67,763,764],{"class":144}," subprocess\n",[67,766,767,769],{"class":69,"line":167},[67,768,761],{"class":88},[67,770,771],{"class":144}," sys\n",[67,773,774,776],{"class":69,"line":181},[67,775,761],{"class":88},[67,777,778],{"class":144}," time\n",[67,780,781],{"class":69,"line":192},[67,782,315],{"emptyLinePlaceholder":314},[67,784,785,788,791],{"class":69,"line":203},[67,786,787],{"class":81},"BUDGET_SECONDS",[67,789,790],{"class":88}," =",[67,792,793],{"class":81}," 5.0\n",[67,795,796],{"class":69,"line":214},[67,797,315],{"emptyLinePlaceholder":314},[67,799,800,803,806],{"class":69,"line":225},[67,801,802],{"class":144},"start ",[67,804,805],{"class":88},"=",[67,807,808],{"class":144}," time.monotonic()\n",[67,810,811,814,816,819,822,824,827,829,832,834,837,839,841],{"class":69,"line":363},[67,812,813],{"class":144},"result ",[67,815,805],{"class":88},[67,817,818],{"class":144}," subprocess.run([",[67,820,821],{"class":77},"\"pre-commit\"",[67,823,293],{"class":144},[67,825,826],{"class":77},"\"run\"",[67,828,293],{"class":144},[67,830,831],{"class":77},"\"--all-files\"",[67,833,293],{"class":144},[67,835,836],{"class":77},"\"--hook-stage\"",[67,838,293],{"class":144},[67,840,821],{"class":77},[67,842,843],{"class":144},"],\n",[67,845,846,850,852,855,857,859,861,863],{"class":69,"line":376},[67,847,849],{"class":848},"s4XuR","                        capture_output",[67,851,805],{"class":88},[67,853,854],{"class":81},"True",[67,856,293],{"class":144},[67,858,107],{"class":848},[67,860,805],{"class":88},[67,862,854],{"class":81},[67,864,865],{"class":144},")\n",[67,867,868,871,873,876,879],{"class":69,"line":388},[67,869,870],{"class":144},"elapsed ",[67,872,805],{"class":88},[67,874,875],{"class":144}," time.monotonic() ",[67,877,878],{"class":88},"-",[67,880,881],{"class":144}," start\n",[67,883,884,887],{"class":69,"line":399},[67,885,886],{"class":81},"print",[67,888,889],{"class":144},"(result.stdout)\n",[67,891,892,895,898,901,904],{"class":69,"line":406},[67,893,894],{"class":88},"if",[67,896,897],{"class":144}," elapsed ",[67,899,900],{"class":88},">",[67,902,903],{"class":81}," BUDGET_SECONDS",[67,905,164],{"class":144},[67,907,908,911,914,917,920,923,926,929,932,935,938,940],{"class":69,"line":418},[67,909,910],{"class":144},"    sys.exit(",[67,912,913],{"class":88},"f",[67,915,916],{"class":77},"\"pre-commit stage took ",[67,918,919],{"class":81},"{",[67,921,922],{"class":144},"elapsed",[67,924,925],{"class":88},":.1f",[67,927,928],{"class":81},"}",[67,930,931],{"class":77},"s, budget is ",[67,933,934],{"class":81},"{BUDGET_SECONDS",[67,936,937],{"class":88},":.0f",[67,939,928],{"class":81},[67,941,942],{"class":77},"s; \"\n",[67,944,945,948],{"class":69,"line":427},[67,946,947],{"class":77},"             \"move slow hooks to pre-push or manual\"",[67,949,865],{"class":144},[67,951,952,954,957,959,961,963,965,967,969,972,974,976,978,981],{"class":69,"line":437},[67,953,886],{"class":81},[67,955,956],{"class":144},"(",[67,958,913],{"class":88},[67,960,916],{"class":77},[67,962,919],{"class":81},[67,964,922],{"class":144},[67,966,925],{"class":88},[67,968,928],{"class":81},[67,970,971],{"class":77},"s (budget ",[67,973,934],{"class":81},[67,975,937],{"class":88},[67,977,928],{"class":81},[67,979,980],{"class":77},"s)\"",[67,982,865],{"class":144},[67,984,985],{"class":69,"line":446},[67,986,987],{"class":144},"sys.exit(result.returncode)\n",[10,989,990],{},"Running against all files gives a worst-case figure; real commits touch a few files and are faster. Run it in CI after the hook environments are cached, so environment building does not count against the budget.",[25,992,994],{"id":993},"conclusion","Conclusion",[10,996,997,998,1000,1001,621,1003,1005,1006,1008,1009,1011,1012,1015,1016,23],{},"Fast hooks are hooks people keep. Measure with ",[14,999,55],{},", give every hook precise ",[14,1002,238],{},[14,1004,242],{}," filters, keep millisecond tools like Ruff on commit, move type checking to ",[14,1007,270],{}," and tests to ",[14,1010,274],{}," (with CI running them), run mypy from the project environment with ",[14,1013,1014],{},"require_serial",", keep hook environments stable and cached, and consider prek for faster setup. Then put the budget in a script, so the next slow hook is caught before anyone reaches for ",[14,1017,724],{},[25,1019,1021],{"id":1020},"frequently-asked-questions","Frequently asked questions",[122,1023,1025],{"id":1024},"why-not-run-the-whole-test-suite-as-a-hook","Why not run the whole test suite as a hook?",[10,1027,1028,1029,1031],{},"Because it turns every commit into a test run, and the first thing people do is disable it. Tests belong in CI and in the developer's own workflow; a ",[14,1030,274],{},"-stage hook gives a convenient shortcut without the tax.",[122,1033,1035],{"id":1034},"do-pre-push-hooks-run-in-ci","Do pre-push hooks run in CI?",[10,1037,1038,1039,1042],{},"Only if CI asks for them: ",[14,1040,1041],{},"pre-commit run --all-files --hook-stage pre-push",". Add that step (or run mypy separately) so pre-push checks are enforced, not just suggested.",[122,1044,1046],{"id":1045},"does-pre-commit-run-hooks-in-parallel","Does pre-commit run hooks in parallel?",[10,1048,1049,1050,1052],{},"Within a hook, pre-commit splits the file list across processes unless ",[14,1051,1014],{}," is set. Different hooks run one after another. prek can run independent hooks concurrently, which is one source of its speed advantage.",[122,1054,1056],{"id":1055},"my-hook-is-fast-locally-but-slow-in-ci-why","My hook is fast locally but slow in CI — why?",[10,1058,1059],{},"Usually a cold cache: CI rebuilds hook environments because the cache key changed or caching is missing. Check the job log for \"Installing environment\" lines.",[25,1061,1063],{"id":1062},"related","Related",[30,1065,1066,1072,1077,1083,1089],{},[33,1067,1068,1069],{},"Up: ",[19,1070,1071],{"href":21},"Pre-commit hooks for CLI projects",[33,1073,1074],{},[19,1075,1076],{"href":562},"Running pre-commit in CI",[33,1078,1079],{},[19,1080,1082],{"href":1081},"\u002Fproject-setup-dependency-management\u002Fpre-commit-hooks-for-cli-projects\u002Fwriting-local-pre-commit-hooks-in-python\u002F","Writing local pre-commit hooks in Python",[33,1084,1085],{},[19,1086,1088],{"href":1087},"\u002Fproject-setup-dependency-management\u002Flinting-and-type-checking-cli-code\u002Ftype-checking-click-and-typer-code-with-mypy\u002F","Type-checking Click and Typer code with mypy",[33,1090,1091],{},[19,1092,1094],{"href":1093},"\u002Fproject-setup-dependency-management\u002Fpre-commit-hooks-for-cli-projects\u002Fkeeping-hook-versions-current-with-autoupdate\u002F","Keeping hook versions current with autoupdate",[1096,1097,1098],"style",{},"html pre.shiki code .sScJk, html code.shiki .sScJk{--shiki-default:#6F42C1;--shiki-dark:#B392F0}html pre.shiki code .sZZnC, html code.shiki .sZZnC{--shiki-default:#032F62;--shiki-dark:#9ECBFF}html pre.shiki code .sj4cs, html code.shiki .sj4cs{--shiki-default:#005CC5;--shiki-dark:#79B8FF}html pre.shiki code .szBVR, html code.shiki .szBVR{--shiki-default:#D73A49;--shiki-dark:#F97583}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: 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.s4XuR{--shiki-default:#E36209;--shiki-dark:#FFAB70}",{"title":63,"searchDepth":158,"depth":158,"links":1100},[1101,1102,1103,1110,1111,1112,1113,1119],{"id":27,"depth":158,"text":28},{"id":49,"depth":158,"text":50},{"id":119,"depth":158,"text":120,"children":1104},[1105,1106,1107,1108,1109],{"id":124,"depth":167,"text":125},{"id":260,"depth":167,"text":261},{"id":593,"depth":167,"text":594},{"id":643,"depth":167,"text":644},{"id":662,"depth":167,"text":663},{"id":686,"depth":158,"text":687},{"id":740,"depth":158,"text":741},{"id":993,"depth":158,"text":994},{"id":1020,"depth":158,"text":1021,"children":1114},[1115,1116,1117,1118],{"id":1024,"depth":167,"text":1025},{"id":1034,"depth":167,"text":1035},{"id":1045,"depth":167,"text":1046},{"id":1055,"depth":167,"text":1056},{"id":1062,"depth":158,"text":1063},"2026-10-02","Make pre-commit fast enough that nobody skips it: measure per-hook durations, filter files, move slow checks to pre-push or manual stages, fix mypy hooks and try prek.","intermediate",false,"md",{},"\u002Fproject-setup-dependency-management\u002Fpre-commit-hooks-for-cli-projects\u002Fspeeding-up-slow-pre-commit-hooks",{"title":5,"description":1121},"project-setup-dependency-management\u002Fpre-commit-hooks-for-cli-projects\u002Fspeeding-up-slow-pre-commit-hooks\u002Findex",[74,1130,1131,1132,671],"performance","mypy","developer-experience","JTu2D3L5x2X7_BdJAKWq5Bk2nZccz-L5zfOUDujN-QI",[1135,1138,1141,1144,1147,1150,1153,1156,1159,1162,1165,1168,1171,1174,1177,1180,1183,1186,1189,1192,1195,1198,1201,1204,1207,1210,1213,1216,1219,1222,1225,1228,1231,1234,1237,1240,1243,1246,1249,1252,1255,1258,1261,1264,1267,1270,1273,1276,1279,1282,1285,1288,1291,1294,1297,1300,1303,1306,1309,1312,1315,1318,1321,1324,1327,1330,1333,1336,1339,1342,1345,1348,1351,1354,1357,1360,1363,1366,1369,1372,1375,1378,1381,1384,1387,1390,1393,1396,1399,1402,1405,1408,1411,1414,1417,1420,1423,1426,1429,1432,1435,1438,1441,1444,1447,1450,1453,1456,1459,1462,1465,1468,1471,1474,1477,1480,1483,1486,1489,1492,1495,1498,1501,1504,1507,1510,1513,1516,1519,1522,1525,1528,1531,1534,1537,1540,1543,1546,1549,1552,1554,1557,1560,1563,1566,1569,1572,1575,1578,1581,1584,1587,1590,1593,1596,1599,1602,1605,1608,1611,1614,1617,1620,1623,1626,1629,1632,1635,1638,1641,1644,1647,1650,1653,1656,1659,1662,1665,1668,1671,1674,1677,1680,1683,1686,1689,1692,1695,1698,1701,1704,1707,1710,1713,1716,1719,1722,1725,1728,1731,1734,1737,1740,1743,1746,1749,1752,1755,1758,1761,1764,1767,1770,1773,1776,1779,1782,1785,1788,1791,1794,1797,1800,1803,1806,1809,1812,1815,1818,1821,1824,1827,1830,1833,1836,1839,1842,1845,1848,1851,1854,1857,1860,1863,1866,1869,1872,1875,1878,1881,1884,1887,1890,1893,1896,1899,1902,1905,1908,1911,1914,1915,1918,1921,1924,1927,1930,1933,1936,1939,1942,1945,1948,1951,1954,1957,1960,1963,1966,1969,1972,1975],{"path":1136,"title":1137},"\u002Fabout","About Python CLI Toolcraft",{"path":1139,"title":1140},"\u002Fadvanced-input-parsing-user-experience\u002Fadvanced-argument-validation-strategies","Advanced Argument Validation Strategies",{"path":1142,"title":1143},"\u002Fadvanced-input-parsing-user-experience\u002Fadvanced-argument-validation-strategies\u002Fparsing-nested-json-arguments-in-python-clis","Parsing Nested JSON Args in Python CLIs",{"path":1145,"title":1146},"\u002Fadvanced-input-parsing-user-experience\u002Fadvanced-argument-validation-strategies\u002Fvalidating-dates-and-durations-in-cli-arguments","Validating Dates and Durations in Python CLI Arguments",{"path":1148,"title":1149},"\u002Fadvanced-input-parsing-user-experience\u002Fadvanced-argument-validation-strategies\u002Fvalidating-dependent-and-conflicting-options","Validating Dependent and Conflicting CLI Options",{"path":1151,"title":1152},"\u002Fadvanced-input-parsing-user-experience\u002Fadvanced-argument-validation-strategies\u002Fvalidating-file-and-directory-paths-in-clis","Validating File and Directory Paths in CLIs",{"path":1154,"title":1155},"\u002Fadvanced-input-parsing-user-experience\u002Fadvanced-argument-validation-strategies\u002Fvalidating-urls-hosts-and-ports","Validating URLs, Hosts and Ports in Python CLI Arguments",{"path":1157,"title":1158},"\u002Fadvanced-input-parsing-user-experience\u002Fadvanced-argument-validation-strategies\u002Fwriting-custom-click-parameter-types","Writing Custom Click Parameter Types",{"path":1160,"title":1161},"\u002Fadvanced-input-parsing-user-experience\u002Fbuilding-terminal-uis-with-textual\u002Fbrowsing-records-with-a-textual-datatable","Browsing Records with a Textual DataTable Picker",{"path":1163,"title":1164},"\u002Fadvanced-input-parsing-user-experience\u002Fbuilding-terminal-uis-with-textual\u002Fbuilding-your-first-textual-app","Building Your First Textual App for a Python CLI",{"path":1166,"title":1167},"\u002Fadvanced-input-parsing-user-experience\u002Fbuilding-terminal-uis-with-textual\u002Fchoosing-between-a-cli-a-prompt-flow-and-a-tui","Choosing Between a CLI, a Prompt Flow and a TUI",{"path":1169,"title":1170},"\u002Fadvanced-input-parsing-user-experience\u002Fbuilding-terminal-uis-with-textual","Building Terminal UIs with Textual for Python CLIs",{"path":1172,"title":1173},"\u002Fadvanced-input-parsing-user-experience\u002Fbuilding-terminal-uis-with-textual\u002Frunning-background-work-in-textual-with-workers","Running Background Work in Textual with Workers",{"path":1175,"title":1176},"\u002Fadvanced-input-parsing-user-experience\u002Fbuilding-terminal-uis-with-textual\u002Fstyling-textual-apps-with-tcss","Styling Textual Apps with TCSS",{"path":1178,"title":1179},"\u002Fadvanced-input-parsing-user-experience\u002Fbuilding-terminal-uis-with-textual\u002Ftesting-textual-apps-with-pilot","Testing Textual Apps with Pilot",{"path":1181,"title":1182},"\u002Fadvanced-input-parsing-user-experience\u002Fcli-help-output-and-documentation\u002Fadding-examples-and-epilogs-to-help-output","Adding Examples and Epilogs to Help Output",{"path":1184,"title":1185},"\u002Fadvanced-input-parsing-user-experience\u002Fcli-help-output-and-documentation\u002Fdocumenting-environment-variables-in-help","Documenting Environment Variables in CLI Help",{"path":1187,"title":1188},"\u002Fadvanced-input-parsing-user-experience\u002Fcli-help-output-and-documentation\u002Fgenerating-man-pages-and-docs-from-a-cli","Generating Man Pages and Docs from a CLI",{"path":1190,"title":1191},"\u002Fadvanced-input-parsing-user-experience\u002Fcli-help-output-and-documentation","CLI Help Output and Documentation",{"path":1193,"title":1194},"\u002Fadvanced-input-parsing-user-experience\u002Fcli-help-output-and-documentation\u002Frich-formatted-help-with-rich-click","Rich-Formatted Help for Click CLIs with rich-click",{"path":1196,"title":1197},"\u002Fadvanced-input-parsing-user-experience\u002Fcli-help-output-and-documentation\u002Fversioning-and-deprecating-cli-flags","Versioning and Deprecating CLI Flags",{"path":1199,"title":1200},"\u002Fadvanced-input-parsing-user-experience\u002Fcli-help-output-and-documentation\u002Fwriting-help-text-users-actually-read","Writing Help Text Users Actually Read",{"path":1202,"title":1203},"\u002Fadvanced-input-parsing-user-experience\u002Fcross-platform-terminal-compatibility\u002Fadapting-output-to-terminal-width","Adapting Python CLI Output to Terminal Width",{"path":1205,"title":1206},"\u002Fadvanced-input-parsing-user-experience\u002Fcross-platform-terminal-compatibility\u002Fdetecting-ci-environments-and-non-interactive-shells","Detecting CI Environments and Non-Interactive Shells",{"path":1208,"title":1209},"\u002Fadvanced-input-parsing-user-experience\u002Fcross-platform-terminal-compatibility\u002Ffixing-unicode-and-encoding-errors-on-windows","Fixing Unicode and Encoding Errors on Windows in Python CLIs",{"path":1211,"title":1212},"\u002Fadvanced-input-parsing-user-experience\u002Fcross-platform-terminal-compatibility\u002Fhandling-ansi-escape-codes-on-windows-consoles","Handling ANSI Escape Codes on Windows Consoles",{"path":1214,"title":1215},"\u002Fadvanced-input-parsing-user-experience\u002Fcross-platform-terminal-compatibility","Cross-Platform Terminal Compatibility for Python CLIs",{"path":1217,"title":1218},"\u002Fadvanced-input-parsing-user-experience\u002Fcross-platform-terminal-compatibility\u002Frespecting-no-color-and-force-color","Respecting NO_COLOR and FORCE_COLOR in Python CLIs",{"path":1220,"title":1221},"\u002Fadvanced-input-parsing-user-experience\u002Fcross-platform-terminal-compatibility\u002Fsupporting-dumb-terminals-and-screen-readers","Supporting Dumb Terminals and Screen Readers in a Python CLI",{"path":1223,"title":1224},"\u002Fadvanced-input-parsing-user-experience\u002Ferror-handling-and-exit-codes\u002Fchoosing-exit-codes-for-cli-tools","Choosing Exit Codes for CLI Tools",{"path":1226,"title":1227},"\u002Fadvanced-input-parsing-user-experience\u002Ferror-handling-and-exit-codes\u002Fdesigning-an-exception-hierarchy-for-a-cli","Designing an Exception Hierarchy for a Python CLI",{"path":1229,"title":1230},"\u002Fadvanced-input-parsing-user-experience\u002Ferror-handling-and-exit-codes\u002Fdid-you-mean-suggestions-for-mistyped-input","Did You Mean…? Suggestions for Mistyped CLI Input",{"path":1232,"title":1233},"\u002Fadvanced-input-parsing-user-experience\u002Ferror-handling-and-exit-codes\u002Ffriendly-error-messages-and-tracebacks","Friendly Error Messages and Tracebacks",{"path":1235,"title":1236},"\u002Fadvanced-input-parsing-user-experience\u002Ferror-handling-and-exit-codes\u002Fhandling-keyboard-interrupt-cleanly","Handling Keyboard Interrupt Cleanly",{"path":1238,"title":1239},"\u002Fadvanced-input-parsing-user-experience\u002Ferror-handling-and-exit-codes","Error Handling and Exit Codes for CLIs",{"path":1241,"title":1242},"\u002Fadvanced-input-parsing-user-experience\u002Ferror-handling-and-exit-codes\u002Freporting-machine-readable-errors-in-json-mode","Reporting Machine-Readable Errors in JSON Mode",{"path":1244,"title":1245},"\u002Fadvanced-input-parsing-user-experience\u002Ferror-handling-and-exit-codes\u002Fwriting-crash-reports-users-can-send","Writing Crash Reports Users Can 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Logs",{"path":1529,"title":1530},"\u002Fcli-runtime-systems-integration\u002Fsecrets-and-credentials-in-python-clis\u002Frefreshing-expired-tokens-automatically","Refreshing Expired Tokens Automatically in a Python CLI",{"path":1532,"title":1533},"\u002Fcli-runtime-systems-integration\u002Fsecrets-and-credentials-in-python-clis\u002Fstoring-tokens-with-keyring","Storing CLI Tokens Securely with keyring",{"path":1535,"title":1536},"\u002Fcli-runtime-systems-integration\u002Fsecrets-and-credentials-in-python-clis\u002Fsupporting-multiple-profiles-and-accounts","Supporting Multiple Profiles and Accounts in CLIs",{"path":1538,"title":1539},"\u002Fcli-runtime-systems-integration\u002Fupdate-checks-and-self-updating-clis\u002Fchecking-pypi-for-a-newer-version","Checking PyPI for a Newer Version of Your Python CLI",{"path":1541,"title":1542},"\u002Fcli-runtime-systems-integration\u002Fupdate-checks-and-self-updating-clis","Update Checks, Upgrade Commands and Telemetry for Python 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