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PlaybookDiff
Keep Claude Code and Codex on the same playbook
Claude Code and Codex can use the same repo and still receive different effective instructions. PlaybookDiff is an open-source, deterministic checker that compiles the instructions, skills, and MCP config each agent receives, then shows where they diverge and why. Run it from npm, use it in CI with the GitHub Action, or inspect the source. Read-only, no model calls, and it never executes your repo.
I have 3 go-to dinner spots in NYC: Nyonya, Izakaya Zest, and Joe’s Shanghai.
My girlfriend vetoed all 3 one night, which was confusing because historically these picks have a pretty good success rate.
Then she mentioned one small detail: we were walking around Little Island after dinner.
Oh.
LOS TACOS No. 1.
The recommendations weren’t bad. I was just working with incomplete context.
That’s basically the idea that led me to PlaybookDiff.
I kept noticing that Claude Code and Codex could be sitting in the same repo, but because they discover instructions, skills, and MCP config differently, they weren’t necessarily working from the same playbook.
So I built a small open-source tool to make those differences visible.
You can run it locally, use it in CI with the GitHub Action, or just poke around the repo.
Would genuinely love feedback from anyone using both Claude Code and Codex, especially if you’ve run into weird config drift or “why did this agent do that?” moments.
playbookdiff.dev
About PlaybookDiff on Product Hunt
“Keep Claude Code and Codex on the same playbook”
PlaybookDiff was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #129 on the daily leaderboard. Claude Code and Codex can use the same repo and still receive different effective instructions. PlaybookDiff is an open-source, deterministic checker that compiles the instructions, skills, and MCP config each agent receives, then shows where they diverge and why. Run it from npm, use it in CI with the GitHub Action, or inspect the source. Read-only, no model calls, and it never executes your repo.
On the analytics side, PlaybookDiff competes within Software Engineering, Developer Tools and GitHub — topics that collectively have 604.2k followers on Product Hunt. The dashboard above tracks how PlaybookDiff performed against the three products that launched closest to it on the same day.
Who hunted PlaybookDiff?
PlaybookDiff was hunted by Jacob C. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of PlaybookDiff including community comment highlights and product details, visit the product overview.
Jacob C