Claude Code mod
lens
Langfuse-lite for Claude Code — records load, usage, cache hits, turn scores and cost per session; /lens pane and prompt line; lens-review skill
Install
/plugin marketplace add Dominic-DK/harnist
/plugin install lens@harnistMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L2Writes or runs: writes files, drives Claude, reads files, reads env vars, reads mod state, persists state, draws
- Sees
- mcp__lens__report calls, the system prompt, every skill, subagent spawns, every tool call, compaction
- Draws in
PromptHintPane- Hooks
tool.callsession.startsession.endcommand.runprompt.sectionprompt.composeprompt.attachmentskill.promptagent.spawntool.checkturn.startsession.compactturn.stepturn.completesession.measureui.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.
Details
- Repository
- Dominic-DK/harnist
- Folder
lens- Marketplace
harnist- Author
- Dominic Lee
- License
- MIT
- Last updated
- 28 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is lens?
Langfuse-lite for Claude Code — records load, usage, cache hits, turn scores and cost per session; /lens pane and prompt line; lens-review skill It is a mod for Claude Code, from Dominic-DK/harnist on GitHub.
What can the lens mod access?
Its widest reach is "writes or runs" (writes files, drives Claude, reads files, reads env vars, reads mod state, persists state, draws). It sees mcp__lens__report calls, the system prompt, every skill, subagent spawns, every tool call, compaction. It draws in PromptHint, Pane. Like any mod, it runs with your permissions.
How do I install lens?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add Dominic-DK/harnist and then /plugin install lens@harnist.
Is lens popular?
Dominic-DK/harnist has 3 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 28 October 2026.
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