Claude Code mod

faultline

KOZMOS Faultline: the error lens in a sidebar. Every failed or denied tool call, refused or errored turn and API error, grouped by a masked signature with count, first and last seen, the agents that hit it, the full first error (expandable) and a copy button, under a severity strip of the last 10 minutes. /faultline toggles it.

21 starsPane & dashboard mods Plugin marketplaceValidates on Claude Code 2.1.316 Source

Install

Inside Claude Code
/plugin marketplace add ersinkoc/claude-mods
/plugin install faultline@kozmos

Mods install like plugins. Run /reload-plugins or start a new session to load it.

What it can access

Reach
L1Reads: writes the clipboard, reads mod state, draws
Sees
subagent spawns, every tool call, classic hooks
Draws in
Pane
Hooks
session.startcommand.runagent.spawntool.callturn.completeclassic.StopFailureui.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
ersinkoc/claude-mods
Folder
mods/faultline
Marketplace
kozmos
Author
KOZMOS
Type
Pane & dashboard mods
License
MIT
Last updated
20 October 2026
Listed in
awesome-claude-code-mods

FAQ

What is faultline?

KOZMOS Faultline: the error lens in a sidebar. Every failed or denied tool call, refused or errored turn and API error, grouped by a masked signature with count, first and last seen, the agents that hit it, the full first error (expandable) and a copy button, under a severity strip of the last 10 minutes. /faultline toggles it. It is a mod for Claude Code, from ersinkoc/claude-mods on GitHub.

What can the faultline mod access?

Its widest reach is "reads" (writes the clipboard, reads mod state, draws). It sees subagent spawns, every tool call, classic hooks. It draws in Pane. Like any mod, it runs with your permissions.

How do I install faultline?

Inside Claude Code (v2.1.287 or later), run /plugin marketplace add ersinkoc/claude-mods and then /plugin install faultline@kozmos.

Is faultline popular?

ersinkoc/claude-mods has 21 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 20 October 2026.

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