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Plugin
diffler
Prove you understand the diff. Diffler generates comprehension quizzes from Git branch diffs for Claude Code, OpenCode, and pull-request workflows.
Plugin Signal51/100Fair
maintained99
capable14
documented50
adopted15
Install
$ npx -y skills add jamestkelly/diffler --agent claude-code
Stats
4
Stars
2
Forks
Active
Maintenance
TypeScript
Language
MIT
License
14d ago
Last commit
1mo ago
Created
Repo: jamestkelly/diffler
What's inside
README
Diffler
Prove you understand the diff.
Diffler generates comprehension quizzes from Git branch diffs for Claude Code, OpenCode, and pull-request workflows. Its agent skill collects focused branch context, generates graded questions, and delivers them either as an offline quiz in your local terminal or as a published Google Form.
Status
Diffler is in early development. The repository contains the TypeScript project foundation, versioned quiz-document contract, local branch-context collection, interactive local quiz delivery, Google Forms authentication and publication, and a portable Claude Code and OpenCode skill.
Requirements
- Node.js 24 or newer
- pnpm 11.18.0
- Git 2.42 or newer
Development
Install dependencies and run all checks:
pnpm install --frozen-lockfile
pnpm check
pnpm build
Run the development CLI:
pnpm start --help
pnpm start context --base main
pnpm start quiz .diffler/quiz.json --context .diffler/context.json
pnpm start publish .diffler/quiz.json --context .diffler/context.json
Run an installed quiz locally, without Google authentication or network access:
diffler quiz .diffler/quiz.json --context .diffler/context.json
Google authentication is optional and needed only for Forms delivery. To
authorize publication, follow the
Google authentication setup, then run
diffler auth login. Maintainers can still select a bring-your-own Desktop
client with --credentials <path>.
Install the packaged agent skill and check local readiness with:
diffler skill install claude --scope user
diffler doctor
See Google Forms publishing for the optional publication flow and manual verification steps. Install the agent workflow using the skill installation guide. Maintainers can inspect and install the exact npm tarball by following the npm publication guide.
The aggregate check command verifies formatting, linting, types, and tests.
CI runs the same checks on pull requests and pushes to main.
The stable Review Gate check and recommended branch protection are documented
in Repository Settings.
Maintainers can verify both canonical Google Cloud environments without making
changes by running pnpm cloud:check; see
Google Authentication.
Intended Workflow
- Compare the current branch with its merge base.
- Exclude generated and low-value changes.
- Ask questions about behavior, rationale, risks, and changed invariants.
- Validate the quiz document.
- Choose an interactive local quiz or an automatically graded Google Form.
Repository Layout
src/ TypeScript CLI and domain implementation
docs/ Context and quiz contracts
skills/diffler/ Packaged Claude Code and OpenCode skill
.github/workflows/ Continuous integration
Design Principles
- Prefer a small, verifiable implementation over speculative flexibility.
- Keep Git, quiz-domain, and Google API responsibilities separate.
- Treat diffs, generated questions, credentials, and OAuth tokens as sensitive.
- Make local commands and CI enforce the same checks.
License
MIT. See LICENSE.
File tree
More plugins by @jamestkelly.
View @jamestkelly’s profile@jamestkellyFAQ
diffler is a Claude Code plugin with 1 hand-picked skill for development work, indexed on Flowy. Install it with the command on its page. It includes diffler. Its skills do not fire on their own yet. Request auto-invocation to have Flowy route them as you prompt. Free and open source.
- What is diffler?
- Prove you understand the diff. Diffler generates comprehension quizzes from Git branch diffs for Claude Code, OpenCode, and pull-request workflows.
- How do I install diffler?
- Run these in Claude Code: npx -y skills add jamestkelly/diffler --agent claude-code. Then prompt normally.
- Does diffler auto-invoke its skills?
- Not yet. It is indexed on Flowy as a plain plugin. Request auto-invocation on its page and Flowy will route its skills for you as you prompt.
- Is diffler free?
- Yes. Flowy is free and open source, with nothing gated. You can read every skill in full before you install.
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