{"slug": "simple-technical-high-fidelity-tl-dr-of-a-github-pr-grounded-in-the-real-diff", "title": "Simple, technical, high-fidelity tl;dr of a GitHub PR — grounded in the real diff, jargon explained inline", "summary": "A developer created a tool that generates concise, technically precise summaries of GitHub pull requests by grounding them in the actual diff rather than the PR description. The tool resolves the PR from a URL, number, or current branch, fetches metadata and diff via the GitHub CLI, and produces a structured tl;dr with inline jargon glosses, flagging discrepancies between description and code.", "body_md": "Error in user YAML: (<unknown>): did not find expected key while parsing a block mapping at line 1 column 1\n\n```\n---\ndescription: Simple, technical, high-fidelity tl;dr of a GitHub PR — grounded in the real diff, jargon explained inline.\nargument-hint: '[PR URL | PR number | (empty = current branch's PR)]'\n---\n```\n\nProduce a short, plain-English-but-technically-precise summary of a PR. Optimize for a reader who is smart but was not in the room: every jargon term or acronym gets a quick inline gloss the first time it appears, but nothing is dumbed down or made less accurate.\n\n**The core discipline: ground the summary in the real diff, not just the PR description.** PR descriptions (especially AI-authored ones) can be stale, aspirational, or wrong. Read the actual commits/diff and treat the written description as a claim to verify, not a source of truth.\n\n-\n**Resolve the PR.**- Argument is a full URL → use it directly.\n- Argument is a bare number → needs a\n`--repo`\n\n; infer from the current directory's git remote (`gh repo view --json nameWithOwner`\n\n) if not stated. - No argument → resolve the PR for the current branch (\n`gh pr view --json ...`\n\nwith no ref uses the current branch).\n\n-\n**Pull real data, not just the description:**`gh pr view <ref> --repo <repo> --json title,body,commits,url,additions,deletions,files`\n\n`gh pr diff <ref> --repo <repo>`\n\n— read enough of the actual diff to independently confirm what changed. For large diffs, prioritize the files with the biggest change or that match the PR title's claim.- If the description references specific functions/endpoints/behavior, spot-check them in the diff or via\n`gh api`\n\n/file reads. Note it if the description and the diff disagree.\n\n-\n**Write the tl;dr.** Structure:**One-line headline**— what changed and why, in plain English, no unexplained jargon.** What changed**— 2-5 bullets, technically specific (real file/function/endpoint names), each one fact anchored in the diff/commits you actually read.**Why**— the motivating problem or context, in plain terms. Skip if the headline already covers it.** Jargon glosses**— any acronym or term of art (e.g. \"fan-out\", \"dedupe queue\", \"idempotent\") gets a short parenthetical the first time it's used:`fan-out (one event triggering many downstream operations)`\n\n. Don't gloss terms a general engineer already knows (e.g. \"endpoint\", \"lambda\").**Worth flagging**— only if genuinely notable: blast radius, missing test coverage, feature-flag/rollback story, or a discrepancy between the PR description and the real diff. Omit this section entirely if there's nothing worth flagging — don't pad.\n\n-\n**Constraints:**- Default to under ~150 words total. Scale up only if the PR is large/multi-concern — never pad a small PR to look thorough.\n- Never invent behavior not visible in the diff/commits.\n- No restating the PR's own checklist/test-plan verbatim — synthesize, don't transcribe.\n- No headers-for-headers'-sake on a small PR; a tiny one-file fix can just be 2-3 sentences.", "url": "https://wpnews.pro/news/simple-technical-high-fidelity-tl-dr-of-a-github-pr-grounded-in-the-real-diff", "canonical_source": "https://gist.github.com/lfsevergnini/ea10ac042487087c02ba6f2dee91a075", "published_at": "2026-07-31 16:55:21+00:00", "updated_at": "2026-07-31 17:00:12.128768+00:00", "lang": "en", "topics": ["developer-tools"], "entities": ["GitHub"], "alternates": {"html": "https://wpnews.pro/news/simple-technical-high-fidelity-tl-dr-of-a-github-pr-grounded-in-the-real-diff", "markdown": "https://wpnews.pro/news/simple-technical-high-fidelity-tl-dr-of-a-github-pr-grounded-in-the-real-diff.md", "text": "https://wpnews.pro/news/simple-technical-high-fidelity-tl-dr-of-a-github-pr-grounded-in-the-real-diff.txt", "jsonld": "https://wpnews.pro/news/simple-technical-high-fidelity-tl-dr-of-a-github-pr-grounded-in-the-real-diff.jsonld"}}