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- <title>pyproject.toml Release Gate (PEP 639) — free online check</title>
 
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  <!--yj-canon-s101--><link rel="canonical" href="https://getreadystack.com/tools/pyproject-release-gate"></head>
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- <h1>pyproject.toml Release Gate (PEP 639)</h1>
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  <p class="lede">Catches pyproject.toml metadata that breaks your next release: end-of-life requires-python, PEP 639 licence drift, classifier conflicts, setuptools too old for SPDX. Date-aware, offline. Runs entirely in your browser — nothing is uploaded.</p>
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  <textarea id="src" spellcheck="false"># pyproject.toml as an assistant wrote it in one pass
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- <section data-yj-alert="rule" style="margin:1rem auto 1.5rem;max-width:46rem;padding:1.1rem 1.25rem;border:1px solid #d9dee6;border-radius:12px;background:#fbfcfd;font:15px/1.55 system-ui,-apple-system,Segoe UI,sans-serif"><b style="font-size:1.05rem">Get one email when this rule changes</b><div style="opacity:.78;margin:.35rem 0 .8rem">We watch the regulation and vendor sources behind pyproject.toml Release Gate (PEP 639) every day. When a rule changes, you get a single email with what changed and the updated check. No newsletter.</div><div style="display:flex;gap:8px;flex-wrap:wrap"><input id="yjae" type="email" placeholder="you@example.com" style="flex:1;min-width:210px;padding:11px 13px;border:1px solid rgba(140,150,165,.34);border-radius:8px;background:#fff;color:inherit"><button id="yjab" style="padding:11px 18px;border-radius:8px;border:0;cursor:pointer;background:#0f7b3f;color:#fff;font:600 15px system-ui,sans-serif">Notify me</button></div><div id="yjao" hidden style="margin-top:.6rem;color:#0f7b3f">You're on the list. One email when it changes.</div><script>(function(){var b=document.getElementById("yjab"),e=document.getElementById("yjae");if(!b||!e)return;b.addEventListener("click",function(){var v=e.value.trim();if(!/.+@.+\..+/.test(v))return;try{localStorage.setItem("yj_em","1");}catch(_){}fetch(location.origin+"/api/subscribe",{method:"POST",headers:{"Content-Type":"application/json"},body:JSON.stringify({email:v,slug:"pyproject-release-gate",lang:"en",source:"rule_alert"})}).then(function(r){var o=document.getElementById("yjao");o.hidden=false;if(!r.ok){o.textContent="Could not save - please try again.";}}).catch(function(){var o=document.getElementById("yjao");o.hidden=false;o.textContent="Could not save - please try again.";});});})();</script></section>
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  <section data-yj-install="free" style="margin:2rem auto 1rem;max-width:46rem;padding:1.25rem 1.25rem;border:1px solid #cfe3d6;border-radius:12px;background:#f6fbf8;font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif"><h2 style="margin:0 0 .4rem;font-size:1.2rem">Install free</h2><p style="margin:0 0 .8rem;color:#41505f">Free for the file open in your editor - no key, no limit. The workspace sweep and the report ask for a key.</p><a href="https://marketplace.visualstudio.com/items?itemName=ReadyStack.pyproject-release-gate" rel="noopener" data-yj-install-door="mp" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pyproject-release-gate',src:'mp',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">VS Code Marketplace</a><a href="https://open-vsx.org/extension/readystack/pyproject-release-gate" rel="noopener" data-yj-install-door="ovsx" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pyproject-release-gate',src:'ovsx',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">Open VSX (Cursor, VSCodium)</a><a href="https://www.npmjs.com/package/@readystack/pyproject-release-gate" rel="noopener" data-yj-install-door="npm" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pyproject-release-gate',src:'npm',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">npm</a><a href="https://www.npmjs.com/package/@readystack/pyproject-release-gate" rel="noopener" data-yj-install-door="mcp" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pyproject-release-gate',src:'mcp',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">MCP server (npx)</a><a href="https://hub.docker.com/r/getreadystack/pyproject-release-gate" rel="noopener" data-yj-install-door="docker" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pyproject-release-gate',src:'docker',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">Docker Hub</a><pre style="margin:.5rem 0 0;padding:.6rem .8rem;background:#f3f5f8;border-radius:8px;font-size:.9rem;overflow:auto">ext install ReadyStack.pyproject-release-gate
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  npx @readystack/pyproject-release-gate &lt;file&gt;
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- npx @readystack/pyproject-release-gate --mcp</pre><p style="margin:.6rem 0 0;font-size:.92rem;color:#41505f"><a href="https://buy.polar.sh/polar_cl_l6iN1uWt0FwWu7tBsczD0jWpP2vxFM54Wdwqb3KPi1G" rel="nofollow" style="color:#0f7b3f;text-decoration:underline">Team? One key for every ReadyStack linter, 5 seats, $149 once</a></p></section>
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- <section data-yj-cta="paid" style="margin:3rem auto;max-width:46rem;padding:1.5rem 1.25rem;border:1px solid #d8dee9;border-radius:12px;background:#fbfcfe;font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif"><h2 style="margin:0 0 .5rem;font-size:1.25rem">Get the complete version <span class="yj-price">$29</span></h2><p style="margin:.25rem 0 1rem;color:#41505f">This page is the working piece. The full pack has everything below.</p><p style="margin:0 0 1rem;color:#41505f">19 date-aware checks on the [project] metadata that decides whether your next release uploads</p><p style="margin:0 0 1rem;color:#5b6b7c;font-size:.94rem">One hour of a senior Python developer's time costs more than the licence, in any market that publishes to PyPI — and without this the review has to happen by hand at every release.</p><a href="https://buy.polar.sh/polar_cl_Dwv8rDHzgqaWnEsVKKqSDvaTApy7kMa9XNhx70ttYbL" rel="nofollow" style="display:inline-block;padding:.7rem 1.3rem;border-radius:8px;background:#1b64f2;color:#fff;text-decoration:none;font-weight:600">Buy the full version — $29</a></section>
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- <section data-yj="yj-facts-v1" style="max-width:920px;margin:48px auto 0;padding:0 20px;font-family:system-ui,sans-serif"><style>.yj-article p{font:400 15.5px/1.7 system-ui,sans-serif;color:#26313b;margin:0 0 12px;max-width:72ch}.yj-article h2,.yj-article h3,.yj-article h4{font:600 17px/1.35 system-ui,sans-serif;color:#1b1f24;margin:22px 0 8px}.yj-article table{border-collapse:collapse;margin:10px 0 16px;font:14px/1.45 system-ui,sans-serif}.yj-article th,.yj-article td{border:1px solid #e2e6ea;padding:6px 10px;text-align:left}.yj-article th{background:#f4f6f8}.yj-article pre{background:#0f1720;color:#e6edf3;padding:12px 14px;border-radius:8px;overflow:auto;font:13px/1.5 ui-monospace,Menlo,monospace}.yj-article code{font:13px ui-monospace,Menlo,monospace;background:#f1f3f5;padding:1px 4px;border-radius:3px}.yj-article pre code{background:none;padding:0}.yj-article ul,.yj-article ol{font:15px/1.6 system-ui,sans-serif;color:#26313b}</style><p style="font:400 13px/1.5 system-ui,sans-serif;color:#6b7680;margin:0 0 14px"><time datetime="2026-09-11">Updated 2026-09-11</time> · ReadyStack</p><script type="application/ld+json">{"@context":"https://schema.org","@type":"WebPage","dateModified":"2026-09-11","author":{"@type":"Organization","name":"ReadyStack"}}</script><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:0 0 6px;color:#1b1f24">Worked example</h2><p style="font:400 14.5px/1.5 system-ui,sans-serif;margin:0 0 16px;color:#5b6570">Real numbers from this tool, line by line.</p><div class="yj-article"><p><img src="https://getreadystack.com/img/promo/sku37307_result_card.jpg" alt="pyproject.toml Release Gate (PEP 639)" loading="lazy" style="max-width:100%;border-radius:6px"></p>
 
 
 
 
 
 
 
 
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  <p>Eight of the fourteen findings in one 26-line pyproject.toml are errors, and the maintainer who wrote it is a Python library author publishing wheels to PyPI from GitHub Actions. Nothing in it is a typo. Every line was correct when it was written.</p>
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  <p>Packaging metadata goes stale on a calendar, and neither your tests nor your build tools read a calendar.</p>
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  <p>The manifest, abbreviated:</p>
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  <p>The surprise: <code>python -m build</code> and <code>twine check</code> pass a manifest whose interpreter floor died two years ago, because staleness is not a syntax error. Asking an assistant is worse, because it answers from pre-PEP-639 documentation and has no reliable idea what today&#x27;s date is — it hands back the same licence table and the same <code>&gt;=3.8</code> floor that caused the problem.</p>
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  <p>The date matters more than it looks. Take an otherwise clean manifest floored at <code>requires-python = &quot;&gt;=3.10&quot;</code>. On 2026-09-11 that is one warning: Python 3.10 reaches end of life 2026-10-31, fifty days out, so you bump the floor on your own schedule. On 2026-11-15 the same unchanged file is one error. The file did not move. The calendar did.</p>
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  <p>Finding out late has a price: a version number on PyPI cannot be re-used, so a bad release costs you a version, a changelog entry and an explanation.</p>
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- <p>The free tier finishes one job completely: all 19 checks on the file open in your editor, with the line, the spec that moved and the replacement text, plus the same engine as a browser page that uploads nothing. The licence changes scope and ownership rather than depth: every pyproject.toml in a monorepo in one pass, written to a dated report file that stays in the repo and goes into the pull request.</p></div><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:34px 0 6px;color:#1b1f24">Questions people ask</h2><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What does pyproject.toml Release Gate actually do?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">It reads the [project] and [build-system] tables of a pyproject.toml and reports 19 kinds of metadata that break a release: an interpreter floor past end of life, PEP 639 licence drift, classifiers that contradict requires-python, a setuptools pin too old to read the SPDX license field, and fields that are both static and dynamic. Each finding carries the line, the spec and the replacement text.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Who is this for?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Python library maintainers who publish wheels to PyPI from GitHub Actions, and platform engineers who own a monorepo with dozens of pyproject.toml files written by different people in different years. If you tag releases and a failed upload costs you a version number, the checks apply to you.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Why is a free tool or a chatbot not enough?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">twine check, build and pip all accept a manifest whose interpreter floor died two years ago, because staleness is a calendar fact rather than a syntax error. A chatbot answers from pre-PEP-639 training data and has no reliable sense of today&#x27;s date, so it returns the same license table and requires-python floor that caused the failure.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What is free and what needs a licence?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Free covers one file completely: all 19 checks on the pyproject.toml open in your editor, with line numbers and replacement text, plus the same engine as a browser page. The licence changes scope and ownership, not depth — every manifest in the workspace in one pass, written to a dated report file you keep in the repo.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What would this cost without the extension?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">You would read PEP 621, PEP 639 and the CPython release cycle yourself, once per release, for every manifest. One hour of a senior Python developer&#x27;s time costs more than the licence in any market that publishes to PyPI, and a re-used version number cannot be re-uploaded once a bad wheel lands.</p></details><script type="application/ld+json" data-yj="yj-faq-ld">{"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "What does pyproject.toml Release Gate actually do?", "acceptedAnswer": {"@type": "Answer", "text": "It reads the [project] and [build-system] tables of a pyproject.toml and reports 19 kinds of metadata that break a release: an interpreter floor past end of life, PEP 639 licence drift, classifiers that contradict requires-python, a setuptools pin too old to read the SPDX license field, and fields that are both static and dynamic. 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The full version is a one-time licence, 7-day refund.</p><div style="display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px"><a class="yj-rel-c" href="https://getreadystack.com/tools/autohotkey-toml-devicetree-snippets"><span class="yj-rel-t">AutoHotkey v2, TOML and DeviceTree checks for VS Code</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/firmware-release-gate"><span class="yj-rel-t">Firmware Release Gate for sdkconfig and prj.conf</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/spdx-license-field-lint"><span class="yj-rel-t">SPDX License Field Lint for package.json, pyproject.toml and Cargo.toml</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/project-dashboard-template-tableau"><span class="yj-rel-t">Project Dashboard Template for Tableau — PMO Schedule, Budget &amp; Risk (.twb, co</span><span 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  </html>
 
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  <head>
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  <meta charset="utf-8">
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  <meta name="viewport" content="width=device-width,initial-scale=1">
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+ <title>Pyproject Release requirements — check pyproject release metadata</title>
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+ <meta name="description" content="This offline browser tool checks pyproject.toml release metadata for end-of-life Python requirements, PEP 639 licence drift, classifier conflicts, and setuptools SPDX support.">
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  <style>
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  :root{color-scheme:light}body{margin:0;font:15px/1.55 system-ui,-apple-system,"Segoe UI",sans-serif;background:#faf9f5;color:#1a1512}
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  .wrap{max-width:960px;margin:0 auto;padding:28px 18px 60px}h1{font-size:26px;margin:0 0 6px}.lede{color:#4a403a;margin:0 0 16px}
 
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  <!--yj-canon-s101--><link rel="canonical" href="https://getreadystack.com/tools/pyproject-release-gate"></head>
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  <body>
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  <div class="wrap">
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+ <h1>Pyproject Release requirements — check pyproject release metadata</h1>
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  <p class="lede">Catches pyproject.toml metadata that breaks your next release: end-of-life requires-python, PEP 639 licence drift, classifier conflicts, setuptools too old for SPDX. Date-aware, offline. Runs entirely in your browser — nothing is uploaded.</p>
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  <textarea id="src" spellcheck="false"># pyproject.toml as an assistant wrote it in one pass
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  [build-system]
 
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  })();
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  <section data-yj-install="free" style="margin:2rem auto 1rem;max-width:46rem;padding:1.25rem 1.25rem;border:1px solid #cfe3d6;border-radius:12px;background:#f6fbf8;font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif"><h2 style="margin:0 0 .4rem;font-size:1.2rem">Install free</h2><p style="margin:0 0 .8rem;color:#41505f">Free for the file open in your editor - no key, no limit. The workspace sweep and the report ask for a key.</p><a href="https://marketplace.visualstudio.com/items?itemName=ReadyStack.pyproject-release-gate" rel="noopener" data-yj-install-door="mp" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pyproject-release-gate',src:'mp',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">VS Code Marketplace</a><a href="https://open-vsx.org/extension/readystack/pyproject-release-gate" rel="noopener" data-yj-install-door="ovsx" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pyproject-release-gate',src:'ovsx',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">Open VSX (Cursor, VSCodium)</a><a href="https://www.npmjs.com/package/@readystack/pyproject-release-gate" rel="noopener" data-yj-install-door="npm" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pyproject-release-gate',src:'npm',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">npm</a><a href="https://www.npmjs.com/package/@readystack/pyproject-release-gate" rel="noopener" data-yj-install-door="mcp" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pyproject-release-gate',src:'mcp',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">MCP server (npx)</a><a href="https://hub.docker.com/r/getreadystack/pyproject-release-gate" rel="noopener" data-yj-install-door="docker" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'pyproject-release-gate',src:'docker',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">Docker Hub</a><pre style="margin:.5rem 0 0;padding:.6rem .8rem;background:#f3f5f8;border-radius:8px;font-size:.9rem;overflow:auto">ext install ReadyStack.pyproject-release-gate
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  npx @readystack/pyproject-release-gate &lt;file&gt;
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+ npx @readystack/pyproject-release-gate --mcp</pre><p style="margin:.6rem 0 0;font-size:.92rem;color:#41505f"><a href="https://getreadystack.com/api/buy/cl/polar_cl_l6iN1uWt0FwWu7tBsczD0jWpP2vxFM54Wdwqb3KPi1G" rel="nofollow" style="color:#0f7b3f;text-decoration:underline">Team? One key for every ReadyStack linter, 5 seats, $149 once</a></p></section>
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+ <section data-yj-alert="rule" style="margin:1rem auto 1.5rem;max-width:46rem;padding:1.1rem 1.25rem;border:1px solid #d9dee6;border-radius:12px;background:#fbfcfd;font:15px/1.55 system-ui,-apple-system,Segoe UI,sans-serif"><b style="font-size:1.05rem">Get the full rule table as a PDF</b><div style="opacity:.78;margin:.35rem 0 .8rem">All 19 rules pyproject.toml Release Gate (PEP 639) checks, each with its source and date, on printable pages you can hand to your team or auditor. We email it now, and once more only if a rule changes. No newsletter.</div><div style="display:flex;gap:8px;flex-wrap:wrap"><input id="yjae" type="email" placeholder="you@example.com" style="flex:1;min-width:210px;padding:11px 13px;border:1px solid rgba(140,150,165,.34);border-radius:8px;background:#fff;color:inherit"><button id="yjab" style="padding:11px 18px;border-radius:8px;border:0;cursor:pointer;background:#0f7b3f;color:#fff;font:600 15px system-ui,sans-serif">Email me the PDF</button></div><div id="yjao" hidden style="margin-top:.6rem;color:#0f7b3f">Sent. It arrives within the hour - check spam too.</div><script>(function(){var b=document.getElementById("yjab"),e=document.getElementById("yjae");if(!b||!e)return;b.addEventListener("click",function(){var v=e.value.trim();if(!/.+@.+\..+/.test(v))return;try{localStorage.setItem("yj_em","1");}catch(_){}fetch(location.origin+"/api/subscribe",{method:"POST",headers:{"Content-Type":"application/json"},body:JSON.stringify({email:v,slug:"pyproject-release-gate",lang:"en",source:"rule_table"+((b.closest&&b.closest("section")&&b.closest("section").getAttribute("data-yj-moved"))?"_at_result":"")})}).then(function(r){var o=document.getElementById("yjao");o.hidden=false;if(!r.ok){o.textContent="Could not save - please try again.";}}).catch(function(){var o=document.getElementById("yjao");o.hidden=false;o.textContent="Could not save - please try again.";});});})();</script><script>(function(){var e=document.getElementById("yjae"),s=e&&e.closest?e.closest("section"):null,o=document.getElementById("out");if(!s||!o)return;var d=false;function mv(ev){if(d)return;if(ev&&ev.target&&s.contains(ev.target))return;d=true;var b=o;while(b.parentNode&&b.parentNode!==document.body&&b.parentNode.tagName!=="MAIN"&&b.parentNode.tagName!=="ARTICLE")b=b.parentNode;if(!b.parentNode||b===s||b.contains(s))return;try{b.parentNode.insertBefore(s,b.nextSibling);s.setAttribute("data-yj-moved","1");}catch(_){}}document.addEventListener("input",mv,true);document.addEventListener("change",mv,true);})();</script></section>
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+ <section data-yj-cta="paid" style="margin:3rem auto;max-width:46rem;padding:1.5rem 1.25rem;border:1px solid #d8dee9;border-radius:12px;background:#fbfcfe;font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif"><h2 style="margin:0 0 .5rem;font-size:1.25rem">Get the complete version <span class="yj-price">$29</span></h2><p style="margin:.25rem 0 1rem;color:#41505f">This page is the working piece. The full pack has everything below.</p><p style="margin:0 0 1rem;color:#41505f">19 date-aware checks on the [project] metadata that decides whether your next release uploads</p><p style="margin:0 0 1rem;color:#5b6b7c;font-size:.94rem">One hour of a senior Python developer's time costs more than the licence, in any market that publishes to PyPI — and without this the review has to happen by hand at every release.</p><a href="https://getreadystack.com/api/buy/cl/polar_cl_Dwv8rDHzgqaWnEsVKKqSDvaTApy7kMa9XNhx70ttYbL" rel="nofollow" style="display:inline-block;padding:.7rem 1.3rem;border-radius:8px;background:#1b64f2;color:#fff;text-decoration:none;font-weight:600">Buy the full version — $29</a></section>
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+ <!--yj-share-s101--><div style="margin:28px 0 8px;text-align:center"><button id="yjcp" type="button" style="font:inherit;padding:10px 18px;border:1px solid #8884;border-radius:10px;background:transparent;cursor:pointer">Copy link</button><button id="yjimg" type="button" style="font:inherit;padding:10px 18px;margin-left:8px;border:1px solid #8884;border-radius:10px;background:transparent;cursor:pointer">Save result as image</button></div><script>(function(){var b=document.getElementById("yjimg");if(!b)return;b.addEventListener("click",function(){var o=document.getElementById("out");var txt=(o&&(o.innerText||o.textContent)||"").trim();if(!txt){b.textContent="(no result yet)";setTimeout(function(){b.textContent="Save result as image";},1500);return;}var lines=txt.split(String.fromCharCode(10)).filter(function(x){return x.trim();}).slice(0,10);var W=1200,P=56,c=document.createElement("canvas");c.width=W;var lh=38,H=P*2+70+lines.length*lh+60;c.height=H;var x=c.getContext("2d");x.fillStyle="#1a1512";x.fillRect(0,0,W,H);x.fillStyle="#f3e9d2";x.font="600 34px system-ui,Segoe UI,Arial";var t=(document.title||"").split("|")[0].trim();x.fillText(t.slice(0,54),P,P+34);x.font="22px ui-monospace,Menlo,Consolas,monospace";x.fillStyle="#e8dcc4";for(var i=0;i<lines.length;i++){x.fillText(lines[i].slice(0,88),P,P+70+i*lh+22);}x.font="600 22px system-ui,Segoe UI,Arial";x.fillStyle="#c9a227";var d=location.hostname.replace("www.","");x.fillText(d,W-P-x.measureText(d).width,H-P+6);c.toBlob(function(bl){var u=URL.createObjectURL(bl),a=document.createElement("a");a.href=u;a.download=(t||"result").replace(/[^a-z0-9]+/gi,"-").toLowerCase()+"-"+d+".png";document.body.appendChild(a);a.click();setTimeout(function(){URL.revokeObjectURL(u);a.remove();},2000);},"image/png");});})();</script><script>(function(){var b=document.getElementById("yjcp");if(!b)return;var t=b.textContent;b.addEventListener("click",function(){var u=location.href.split("#")[0];function d(){b.textContent="Link copied";setTimeout(function(){b.textContent=t;},1800);}if(navigator.clipboard&&navigator.clipboard.writeText){navigator.clipboard.writeText(u).then(d,function(){prompt("",u);});}else{prompt("",u);}});})();</script><div class="yj-home-find"><div class="yj-lgbar"><a href="/" class="yj-lg on">EN</a><a href="/de/" class="yj-lg">DE</a><a href="/ja/" class="yj-lg">JA</a><a href="/es/" class="yj-lg">ES</a><a href="/pt/" class="yj-lg">PT</a></div><section class="yj-find"><h2>Find a tool</h2><input id="yjq" type="search" autocomplete="off" placeholder="Type a product name, format or task"><div id="yjr"></div></section><style>.yj-lgbar{position:absolute;top:14px;right:18px;display:flex;gap:6px;z-index:60}.yj-lg{font:600 12px/1 system-ui,sans-serif;padding:6px 9px;border-radius:4px;text-decoration:none;color:#8b96a3;border:1px solid rgba(140,150,165,.28)}.yj-lg:hover{color:#e8eaed;border-color:rgba(160,175,195,.6)}.yj-lg.on{color:#0e1116;background:#cfd6de;border-color:#cfd6de}.yj-find{max-width:760px;margin:34px auto 8px;padding:0 20px}.yj-find h2{font:600 20px/1.3 system-ui,sans-serif;margin:0 0 10px}#yjq{width:100%;box-sizing:border-box;padding:13px 15px;font:400 15.5px system-ui,sans-serif;border:1px solid rgba(140,150,165,.34);border-radius:8px;background:rgba(255,255,255,.04);color:inherit}#yjq:focus{outline:none;border-color:#7FD1C4}#yjr{margin-top:10px;display:flex;flex-direction:column;gap:6px}#yjr a{display:flex;justify-content:space-between;gap:12px;padding:11px 14px;border:1px solid rgba(140,150,165,.22);border-radius:6px;text-decoration:none;font:400 14.5px/1.4 system-ui,sans-serif;color:inherit}#yjr a:hover{border-color:#7FD1C4}#yjr .pr{font:600 13px system-ui,sans-serif;color:#5fbf9a;white-space:nowrap}</style><script>(function(){var q=document.getElementById("yjq"),r=document.getElementById("yjr"),D=null;function load(){if(D)return Promise.resolve(D);return fetch("/search-index.json").then(function(x){return x.json();}).then(function(j){D=j;return j;}).catch(function(){D=[];return D;});}function esc(t){return String(t).replace(/[&<>"]/g,function(c){return {"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;"}[c];});}function run(){var v=q.value.trim().toLowerCase();if(v.length<2){r.innerHTML="";return;}load().then(function(j){var w=v.split(/\s+/),o=[];for(var i=0;i<j.length&&o.length<12;i++){var t=j[i].t.toLowerCase();var ok=true;for(var k=0;k<w.length;k++){if(t.indexOf(w[k])<0){ok=false;break;}}if(ok)o.push(j[i]);}r.innerHTML=o.length?o.map(function(x){return "<a href=\""+esc(x.u)+"\">"+"<span>"+esc(x.t)+"</span>"+(x.p?"<span class=\"pr\">$"+x.p+"</span>":"")+"</a>";}).join(""):"";});}q.addEventListener("input",run);q.addEventListener("focus",load);})();</script></div>
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+ <script data-yj="yj-view-beacon">(function(){try{var p=location.pathname;var k='yjv:'+p;if(sessionStorage.getItem(k))return;sessionStorage.setItem(k,'1');fetch('/api/ev',{method:'POST',keepalive:true,headers:{'Content-Type':'application/json'},body:JSON.stringify({path:p,lang:"en",ref:(document.referrer||''),src:(function(){try{return (new URLSearchParams(location.search).get('ref')||'').replace(/[^a-z_]/g,'').slice(0,12)}catch(e){return ''}})()})}).catch(function(){});}catch(e){}})();</script>
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+ <script data-yj="yj-use-beacon">(function(){try{var o=document.getElementById('out');if(!o)return;var p=location.pathname,k='yju:'+p,sent=false;function fire(){if(sent||sessionStorage.getItem(k))return;if(!(o.textContent||'').replace(/\s+/g,'').length)return;sent=true;sessionStorage.setItem(k,'1');fetch('/api/ev',{method:'POST',keepalive:true,headers:{'Content-Type':'application/json'},body:JSON.stringify({path:p,lang:"en",t:'use',src:(function(){try{return (new URLSearchParams(location.search).get('ref')||'').replace(/[^a-z_]/g,'').slice(0,12)}catch(e){return ''}})()})}).catch(function(){});}var mo=new MutationObserver(function(){fire();if(sent)mo.disconnect();});mo.observe(o,{childList:true,characterData:true,subtree:true});}catch(e){}})();</script>
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+ <section data-yj="yj-facts-v1" style="max-width:920px;margin:48px auto 0;padding:0 20px;font-family:system-ui,sans-serif"><style>.yj-article p{font:400 15.5px/1.7 system-ui,sans-serif;color:#26313b;margin:0 0 12px;max-width:72ch}.yj-article h2,.yj-article h3,.yj-article h4{font:600 17px/1.35 system-ui,sans-serif;color:#1b1f24;margin:22px 0 8px}.yj-article table{border-collapse:collapse;margin:10px 0 16px;font:14px/1.45 system-ui,sans-serif}.yj-article th,.yj-article td{border:1px solid #e2e6ea;padding:6px 10px;text-align:left}.yj-article th{background:#f4f6f8}.yj-article pre{background:#0f1720;color:#e6edf3;padding:12px 14px;border-radius:8px;overflow:auto;font:13px/1.5 ui-monospace,Menlo,monospace}.yj-article code{font:13px ui-monospace,Menlo,monospace;background:#f1f3f5;padding:1px 4px;border-radius:3px}.yj-article pre code{background:none;padding:0}.yj-article ul,.yj-article ol{font:15px/1.6 system-ui,sans-serif;color:#26313b}</style><p style="font:400 13px/1.5 system-ui,sans-serif;color:#6b7680;margin:0 0 14px"><time datetime="2026-09-12">Updated 2026-09-12</time> · ReadyStack</p><script type="application/ld+json">{"@context":"https://schema.org","@type":"WebPage","dateModified":"2026-09-12","author":{"@type":"Organization","name":"ReadyStack"}}</script><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:0 0 6px;color:#1b1f24">Worked example</h2><p style="font:400 14.5px/1.5 system-ui,sans-serif;margin:0 0 16px;color:#5b6570">Real numbers from this tool, line by line.</p><div class="yj-article"><p><img src="https://getreadystack.com/img/promo/sku37307_result_card.jpg" alt="pyproject.toml Release Gate (PEP 639)" loading="lazy" style="max-width:100%;border-radius:6px"></p>
396
  <p>Eight of the fourteen findings in one 26-line pyproject.toml are errors, and the maintainer who wrote it is a Python library author publishing wheels to PyPI from GitHub Actions. Nothing in it is a typo. Every line was correct when it was written.</p>
397
  <p>Packaging metadata goes stale on a calendar, and neither your tests nor your build tools read a calendar.</p>
398
  <p>The manifest, abbreviated:</p>
 
405
  <p>The surprise: <code>python -m build</code> and <code>twine check</code> pass a manifest whose interpreter floor died two years ago, because staleness is not a syntax error. Asking an assistant is worse, because it answers from pre-PEP-639 documentation and has no reliable idea what today&#x27;s date is — it hands back the same licence table and the same <code>&gt;=3.8</code> floor that caused the problem.</p>
406
  <p>The date matters more than it looks. Take an otherwise clean manifest floored at <code>requires-python = &quot;&gt;=3.10&quot;</code>. On 2026-09-11 that is one warning: Python 3.10 reaches end of life 2026-10-31, fifty days out, so you bump the floor on your own schedule. On 2026-11-15 the same unchanged file is one error. The file did not move. The calendar did.</p>
407
  <p>Finding out late has a price: a version number on PyPI cannot be re-used, so a bad release costs you a version, a changelog entry and an explanation.</p>
408
+ <p>The free tier finishes one job completely: all 19 checks on the file open in your editor, with the line, the spec that moved and the replacement text, plus the same engine as a browser page that uploads nothing. The licence changes scope and ownership rather than depth: every pyproject.toml in a monorepo in one pass, written to a dated report file that stays in the repo and goes into the pull request.</p></div><h2 style="font:600 19px/1.3 system-ui,sans-serif;margin:30px 0 10px;color:#1b1f24">15 seconds — what it actually does</h2><video controls muted playsinline preload="none" poster="/img/promo/sku37307_result_card.jpg" style="width:100%;max-width:360px;border-radius:10px;display:block;margin:0 auto"><source src="/media/sku37307_short.mp4" type="video/mp4"></video><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:34px 0 6px;color:#1b1f24">Questions people ask</h2><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What does pyproject.toml Release Gate actually do?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">It reads the [project] and [build-system] tables of a pyproject.toml and reports 19 kinds of metadata that break a release: an interpreter floor past end of life, PEP 639 licence drift, classifiers that contradict requires-python, a setuptools pin too old to read the SPDX license field, and fields that are both static and dynamic. Each finding carries the line, the spec and the replacement text.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Who is this for?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Python library maintainers who publish wheels to PyPI from GitHub Actions, and platform engineers who own a monorepo with dozens of pyproject.toml files written by different people in different years. If you tag releases and a failed upload costs you a version number, the checks apply to you.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Why is a free tool or a chatbot not enough?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">twine check, build and pip all accept a manifest whose interpreter floor died two years ago, because staleness is a calendar fact rather than a syntax error. A chatbot answers from pre-PEP-639 training data and has no reliable sense of today&#x27;s date, so it returns the same license table and requires-python floor that caused the failure.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What is free and what needs a licence?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Free covers one file completely: all 19 checks on the pyproject.toml open in your editor, with line numbers and replacement text, plus the same engine as a browser page. The licence changes scope and ownership, not depth — every manifest in the workspace in one pass, written to a dated report file you keep in the repo.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What would this cost without the extension?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">You would read PEP 621, PEP 639 and the CPython release cycle yourself, once per release, for every manifest. One hour of a senior Python developer&#x27;s time costs more than the licence in any market that publishes to PyPI, and a re-used version number cannot be re-uploaded once a bad wheel lands.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Why not just ask ChatGPT or another AI chat?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">A general AI chat answers from training data with a cutoff date, cannot read your repository and names no rule version. pyproject.toml Release Gate (PEP 639) checks the file you open against 19 rules from a rule set dated 2026-09-20, and points at the exact line with the fix. For a filing, an audit or a client you need that dated result on your own files.</p></details><script type="application/ld+json" data-yj="yj-faq-ld">{"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "What does pyproject.toml Release Gate actually do?", "acceptedAnswer": {"@type": "Answer", "text": "It reads the [project] and [build-system] tables of a pyproject.toml and reports 19 kinds of metadata that break a release: an interpreter floor past end of life, PEP 639 licence drift, classifiers that contradict requires-python, a setuptools pin too old to read the SPDX license field, and fields that are both static and dynamic. 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For a filing, an audit or a client you need that dated result on your own files."}}]}</script><div id="yj-ask" style="margin:36px 0 0;padding:18px 18px 16px;border:1px solid #e2e6ea;border-radius:10px;background:#fbfbfc"><h2 style="font:600 19px/1.3 system-ui,sans-serif;margin:0 0 4px;color:#1b1f24">Ask about this tool</h2><p style="font:400 13.5px/1.5 system-ui,sans-serif;margin:0 0 12px;color:#5b6570">One question, answered by the person who built it. Your email only if you want the answer sent.</p><form onsubmit="return yjAsk(event)" style="display:grid;gap:8px"><textarea name="question" required minlength="10" maxlength="2000" rows="3" placeholder="Your question" style="font:14px/1.5 system-ui,sans-serif;padding:10px;border:1px solid #cfd6dd;border-radius:6px"></textarea><div style="display:flex;gap:8px;flex-wrap:wrap"><input type="email" name="email" placeholder="Email (optional)" style="flex:1;min-width:200px;font:14px system-ui,sans-serif;padding:9px 10px;border:1px solid #cfd6dd;border-radius:6px"><button type="submit" style="font:600 14px system-ui,sans-serif;padding:9px 18px;border:0;border-radius:6px;background:#1b1f24;color:#fff;cursor:pointer">Send</button></div><p id="yj-ask-msg" style="font:13px system-ui,sans-serif;margin:2px 0 0;color:#0a6238;min-height:1em"></p></form><script>function yjAsk(e){e.preventDefault();var f=e.target,m=document.getElementById("yj-ask-msg");m.style.color="#0a6238";fetch(location.origin+"/api/ask",{method:"POST",headers:{"Content-Type":"application/json"},body:JSON.stringify({sku:37307,slug:"pyproject-release-gate",lang:"en",question:f.question.value,email:f.email.value,page:location.pathname})}).then(function(r){if(!r.ok)throw 0;m.textContent="Thanks \u2014 noted. Answers land on this page and, if you left an email, in your inbox.";f.question.value="";}).catch(function(){m.style.color="#a8551f";m.textContent="Could not send. Please try again in a minute.";});return false;}</script></div></section><section class="yj-related" style="max-width:920px;margin:56px auto 40px;padding:0 20px"><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:0 0 6px;color:#1b1f24">Same job, next tool</h2><p style="font:400 14.5px/1.5 system-ui,sans-serif;margin:0 0 20px;color:#5b6570">Free in the browser. The full version is a one-time licence.</p><div style="display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px"><a class="yj-rel-c" href="https://getreadystack.com/tools/cargo-publish-gate"><span class="yj-rel-t">Cargo.toml Publish Gate - crates.io</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/autohotkey-toml-devicetree-snippets"><span class="yj-rel-t">AutoHotkey v2, TOML and DeviceTree checks for VS Code</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/firmware-release-gate"><span class="yj-rel-t">Firmware Release Gate for sdkconfig and prj.conf</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/maven-central-publish-gate"><span class="yj-rel-t">Maven Central Publish Gate</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/renpy-release-gate"><span class="yj-rel-t">Ren&#x27;Py Release Gate</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/spdx-license-field-lint"><span class="yj-rel-t">SPDX License Field Lint for package.json, pyproject.toml and Cargo.toml</span><span class="yj-rel-p">$29</span></a></div><style>.yj-rel-c{display:flex;flex-direction:column;gap:8px;padding:15px 16px;border:1px solid #e2e6ea;border-radius:6px;text-decoration:none;background:#fff}.yj-rel-c:hover{border-color:#b9c2cb;background:#fafbfc}.yj-rel-t{font:500 14.5px/1.42 system-ui,sans-serif;color:#1b1f24}.yj-rel-p{font:600 13px system-ui,sans-serif;color:#0a6238}</style></section></body>
 
 
 
 
 
 
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