Claude Code mod

assertion-guardian

Blocks edits that weaken tests to fake a green run: removed or loosened assertions, added skips, deleted cases, swallowed errors, snapshot rewrites

Guard & safety modsValidates on Claude Code 2.1.316 Source

Install

From source
git clone https://github.com/ccdwyer/assertion-guardian.git
claude --plugin-dir ./assertion-guardian/.

The repo has no marketplace file, so load the plugin folder directly with --plugin-dir.

What it can access

Reach
L2Writes or runs: runs processes, reads files, reads mod state, draws
Sees
every tool call
Draws in
AbovePrompt
Hooks
session.startcommand.runtool.callui.render

From a static scan of the mod's code by awesome-claude-code-mods. It shows what the code asks for, not a security review.

How Claude Code mods work

  • A mod is a plugin with a JavaScript or TypeScript module that runs inside Claude Code (version 2.1.287 or later). It can draw panes beside the transcript, a band above the prompt, buttons and toasts, restyle the spinner and tool rows, and watch or rewrite tool calls and prompts.
  • It installs like any plugin: add its marketplace with /plugin marketplace add owner/repo, then /plugin install name@marketplace.
  • Check what a mod can reach before installing: it runs with your permissions. Reach goes from drawing only, to reading files, to writing files or running processes, to the network. Run claude plugin validate on a clone to list its hooks and calls without running it.
  • Turn one off from the Installed tab in /plugin, or start Claude Code with --safe-mode to skip every customization for a session.
Claude Code docs

Details

Repository
ccdwyer/assertion-guardian
Folder
.
Author
Chris Dwyer
Type
Guard & safety mods
License
MIT
Last updated
2 October 2026
Listed in
awesome-claude-code-mods

FAQ

What is assertion-guardian?

Blocks edits that weaken tests to fake a green run: removed or loosened assertions, added skips, deleted cases, swallowed errors, snapshot rewrites It is a mod for Claude Code, from ccdwyer/assertion-guardian on GitHub.

What can the assertion-guardian mod access?

Its widest reach is "writes or runs" (runs processes, reads files, reads mod state, draws). It sees every tool call. It draws in AbovePrompt. Like any mod, it runs with your permissions.

How do I install assertion-guardian?

Clone ccdwyer/assertion-guardian and start Claude Code with --plugin-dir pointing at the mod's folder (.).

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