Claude Code mod
cassandra
Remembers the tool calls that already failed, and says so before your agent runs one again unchanged.
Install
git clone https://github.com/AraneaDev/cassandra.git
claude --plugin-dir ./cassandra/.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, writes files, drives Claude, reads files, reads env vars, reads mod state, draws
- Sees
- compaction, subagent spawns, ? calls
- Draws in
Pane- Hooks
session.startsession.endsession.compactagent.spawnsession.appendcommand.runui.renderui.pressui.inputui.focustool.call
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.
Details
- Repository
- AraneaDev/cassandra
- Folder
.- Author
- AraneaDev
- License
- MIT
- Last updated
- 1 November 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is cassandra?
Remembers the tool calls that already failed, and says so before your agent runs one again unchanged. It is a mod for Claude Code, from AraneaDev/cassandra on GitHub.
What can the cassandra mod access?
Its widest reach is "writes or runs" (runs processes, writes files, drives Claude, reads files, reads env vars, reads mod state, draws). It sees compaction, subagent spawns, ? calls. It draws in Pane. Like any mod, it runs with your permissions.
How do I install cassandra?
Clone AraneaDev/cassandra and start Claude Code with --plugin-dir pointing at the mod's folder (.).
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