Claude Code mod
sidekick
Checks your message before it is sent, by rules and, where worthwhile, briefly with Haiku 5.5 (Sonnet 5.5 writes rewritten versions in level auto): a hint line under your message or a question (new chat with handoff, a skill, a clearer version, or "wrong chat?" when the message belongs to another project). Names due maintenance once per chat (/skill-doctor, prompt-audit, consolidate-memory, /init). With worklist installed, a long message with several tasks can be split into 3-4 to-dos, and /later plans text as to-dos. Five levels (off, cache, guide, plan, auto) with a colored label in the prompt footer. /savings shows cost and measurable savings at a glance, /savings detail compares the models over time. Optional, off by default (/sidekick notes on): while Claude works, a "good to know" note above the prompt when you likely missed something with consequences (one question to your main model over the conversation, every 6 steps). /sidekick help shows all commands and settings as a table.
Install
/plugin marketplace add FynnXland/fynn-mods
/plugin install sidekick@fynn-modsMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L2Writes or runs: drives Claude, writes the prompt box, reads the transcript, reads the prompt box, reads mod state, persists state, draws
- Sees
- Bash|PowerShell calls, every prompt, every skill
- Draws in
UserMessageAbovePromptSessionModeCommandOutput- Hooks
session.startturn.steptool.callprompt.submitskill.promptui.rendercommand.run
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
- FynnXland/fynn-mods
- Folder
mods/sidekick- Marketplace
fynn-mods- Author
- Fynn Hansen
- License
- MIT
- Last updated
- 19 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is sidekick?
Checks your message before it is sent, by rules and, where worthwhile, briefly with Haiku 5.5 (Sonnet 5.5 writes rewritten versions in level auto): a hint line under your message or a question (new chat with handoff, a skill, a clearer version, or "wrong chat?" when the message belongs to another project). Names due maintenance once per chat (/skill-doctor, prompt-audit, consolidate-memory, /init). With worklist installed, a long message with several tasks can be split into 3-4 to-dos, and /later plans text as to-dos. Five levels (off, cache, guide, plan, auto) with a colored label in the prompt footer. /savings shows cost and measurable savings at a glance, /savings detail compares the models over time. Optional, off by default (/sidekick notes on): while Claude works, a "good to know" note above the prompt when you likely missed something with consequences (one question to your main model over the conversation, every 6 steps). /sidekick help shows all commands and settings as a table. It is a mod for Claude Code, from FynnXland/fynn-mods on GitHub.
What can the sidekick mod access?
Its widest reach is "writes or runs" (drives Claude, writes the prompt box, reads the transcript, reads the prompt box, reads mod state, persists state, draws). It sees Bash|PowerShell calls, every prompt, every skill. It draws in UserMessage, AbovePrompt, SessionMode, CommandOutput. Like any mod, it runs with your permissions.
How do I install sidekick?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add FynnXland/fynn-mods and then /plugin install sidekick@fynn-mods.
Is sidekick popular?
FynnXland/fynn-mods has 4 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 19 October 2026.
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