lumen-cache by dark-sorceror: Claude Code mod code

What it does

Draws a pane, toasts
Adds /lumen-cache-export, /lumen-cache-sessions, /lumen-cache
Hooks session.compact, session.end, session.start, turn.step
Keeps its own state between turns

Good points

No network calls
Starts no processes
Written in TypeScript
Handles errors

Code to start from

A starter ModsCode writes from the drawing it read, and the mod's own lines that draw, where there are any.

Starter (register.tsx)

import type { Register } from 'claude-code'

// Drawn like lumen-cache by Hao Yan (pane, status, toast), as ModsCode read it from the mod's code:
// https://modscode.com/claude-mods/mods/dark-sorceror-lumen-cache/
// Written by ModsCode from that reading, not copied from the mod: use it as you like.
// Each value below stands for one the mod works out at run time; put in your own.
export const register: Register = on => {
  // the pane: open it with $.ui.open({ id: 'my-pane', title: "Cache horizon" })
  on('ui.render', { component: 'Pane', requestId: 'my-pane' }, async ($, e) => {
    const { Box, Text } = $.ui.resolve(e)
    const pct = '…'
    const tok = '…'
    const tok2 = '…'
    const shapeText = '…'
    const sessionLines = '…'
    const sessionLines2 = '…'
    const sessionLines3 = '…'
    const spendText = '…'
    const requests = '…'
    const tok3 = '…'
    const tok4 = '…'
    const pct2 = '…'
    const tok5 = '…'
    const why = '…'
    const text = '…'
    const note = '…'
    const note2 = '…'
    const note3 = '…'
    const tok6 = '…'
    const pct3 = '…'
    const tok7 = '…'
    const why2 = '…'
    const text2 = '…'
    const note4 = '…'
    const note5 = '…'
    const note6 = '…'
    const tok8 = '…'
    const pct4 = '…'
    const tok9 = '…'
    const why3 = '…'
    const text3 = '…'
    const note7 = '…'
    const note8 = '…'
    const note9 = '…'
    return (
      <Box flexDirection="column" gap={1}>
        <Box flexDirection="column">
          <Text bold>
            Last request
          </Text>
          <Text color="yellow">
            ████████░░░░░░░░
          </Text>
          <Text>
            {pct}
            % reused
          </Text>
          <Text dimColor>
            {tok}
            {" held · "}
            {tok2}
            {" reprocessed"}
          </Text>
          <Text dimColor>
            {shapeText}
          </Text>
        </Box>
        <Box flexDirection="column">
          <Text bold>
            Session · main thread
          </Text>
          <Text>
            {sessionLines}
          </Text>
          <Text>
            {sessionLines2}
          </Text>
          <Text dimColor>
            {sessionLines3}
          </Text>
          <Text dimColor>
            {spendText}
          </Text>
        </Box>
        <Box flexDirection="column">
          <Text bold dimColor>
            Subagents
          </Text>
          <Text dimColor>
            {requests}
            {" requests · "}
            {tok3}
            {" reprocessed"}
          </Text>
          <Text dimColor>
            A fork pays for the whole prefix; not a signal.
          </Text>
        </Box>
        <Box flexDirection="column">
          <Text bold color="yellow">
            1 collapse
          </Text>
          <Box flexDirection="column">
            <Text color="yellow">
              {tok4}
              {" lost · "}
              {pct2}
              % of the prior context
            </Text>
            <Text dimColor>
              {tok5}
              {" reprocessed"}
            </Text>
            <Text dimColor>
              {why}
            </Text>
            <Text color="red">
              {text}
            </Text>
            <Text dimColor>
              {note}
            </Text>
            <Text dimColor>
              {note2}
            </Text>
            <Text dimColor>
              {note3}
            </Text>
          </Box>
          <Box flexDirection="column">
            <Text color="yellow">
              {tok6}
              {" lost · "}
              {pct3}
              % of the prior context
            </Text>
            <Text dimColor>
              {tok7}
              {" reprocessed"}
            </Text>
            <Text dimColor>
              {why2}
            </Text>
            <Text color="red">
              {text2}
            </Text>
            <Text dimColor>
              {note4}
            </Text>
            <Text dimColor>
              {note5}
            </Text>
            <Text dimColor>
              {note6}
            </Text>
          </Box>
          <Box flexDirection="column">
            <Text color="yellow">
              {tok8}
              {" lost · "}
              {pct4}
              % of the prior context
            </Text>
            <Text dimColor>
              {tok9}
              {" reprocessed"}
            </Text>
            <Text dimColor>
              {why3}
            </Text>
            <Text color="red">
              {text3}
            </Text>
            <Text dimColor>
              {note7}
            </Text>
            <Text dimColor>
              {note8}
            </Text>
            <Text dimColor>
              {note9}
            </Text>
          </Box>
        </Box>
        <Box flexDirection="column">
          <Text dimColor>
            cost = T - a, where a is what the cache held.
          </Text>
          <Text dimColor>
            Measured, not estimated.
          </Text>
        </Box>
      </Box>
    )
  })

  on('session.start', async ($, e, next) => {
    const message = '…'
    await $.ui.toast(`lumen-cache: could not save to the store (${message}). Measuring continues, but this session will not be kept.`)
    return next(e)
  })
}

The mod's own code

Its licence text was not found at the commit read, so only the places in the source are linked.

plugins/hooks/register.tsx lines 220–297

How to build this: Pane (panel), Add a slash command

What its code calls

writes filesremembers

What its code shows

Read from the source at commit 771c628f2815 on 2026-10-11. The first group decides whether a mod is listed; the rest is for you to weigh. A later commit is not read until the next crawl.

Decides the listing: code you can check
Entry read	Every module hooks/hooks.json names was read.plugins/hooks/register.tsx
Parses	Every file parses as TypeScript or JavaScript.4 files parsed
All its code is in the mod	Every import is a file of the mod or the engine's own module; no packages, no require.all its code is in the mod
Readable	No minified lines, no eval or new Function, no import of a computed path, no encoded blobs.no minified code, no eval, no encoded blobs
Calls in the open	Network and programs are reached as $.http.fetch and $.process.run in place, never passed around.every call outside goes through $ in the open
For you to weigh before installing
Where it draws	The terminal, the desktop app, both, or nothing (hooks only: a guard or a prompt rewriter), as its code says. Shown, never a reason to leave a mod out.draws in the terminal and the desktop app, the same in both
Install line	Whether its repository's own .claude-plugin/marketplace.json lists it, so it installs from that marketplace with the lines on its page.its repository's .claude-plugin/marketplace.json does not list it: no marketplace line to give; the page shows how to try the commit read
Programs on Windows	Whether every program it starts through $.process exists on Windows (tail, date, open, osascript, /usr/… do not).runs no program a Windows PC lacks
Network	Whether every fetch names its https host in the code.no network
Programs	Whether every program it starts is named in the code and is not a shell, an interpreter or a network tool.starts no programs
Reads and sends	Whether it both reads something of yours (files, environment variables, the transcript, settings) and reaches outside (the network, an MCP server, another session, telemetry).reads files, but reaches nothing outside
Keys in the source	Whether the source holds what looks like an API key or a private key.no keys in the source
Licence	An open licence (MIT, Apache-2.0, BSD, ISC, Unlicense, 0BSD, CC0) with its text lets ModsCode show its code; otherwise the code is linked.no licence
Settings hooks	Hooks declared in hooks/hooks.json or plugin.json beside the module: a command (a shell when it has no args), an HTTP request, an MCP tool or a model prompt at an event. They run outside $.no settings hooks: its function hooks alone
Servers it ships	MCP servers (a program, or a URL; a headersHelper is a shell command; a .mcpb bundle is unpacked at run time), LSP servers, monitors (a shell command for the whole session) and bin/ (on the PATH of the Bash tool).ships no MCP or LSP server, no monitor, no bin/
Skills, commands, agents	What its Markdown declares beyond text: allowed-tools granted for the turn, hooks added when a skill is invoked, a command run before Claude reads the skill.no skills, commands, agents or workflows
Tools and MCP	Whether every tool it calls through $.tool.call and $.mcp.call is named in the code, and none is a shell (Bash through the tool runs a shell without $.process).calls no tool, MCP server or command
Asks of the model	Completions it runs ($.model.complete, fork, classify), subagents it spawns, prompts it submits as you, and the tools, commands and agents it adds.adds command lumen-cache, adds command lumen-cache-export, adds command lumen-cache-sessions
Events it hooks	By what a hook there can do: gates (refuse a tool call, a prompt, a setting, another plugin), shapes (what the model reads: the system prompt, tool descriptions, each request), reads (your input, the events of the settings hooks, every event with *), and the rest.gates: command.run (lumen-cache-export, lumen-cache-sessions, lumen-cache) · shapes: turn.step · also: session.start, session.end, session.compact, ui.render (Pane)
Reads, by name	The environment variables and files it names, and whether it reads the transcript, settings.json, the prompt box or the mouse selection.files, by names the check can't read
Writes, by name	The files and environment variables it names, and whether it changes settings, the prompt box, the clipboard, the conversation (a row the model reads) or another session.files: …/….ts

This is a reading of the code text, not a security review: it does not run the mod, and it cannot see what a program the mod starts does. The check before installing is yours. How mods are chosen

Install it

Check it yourself before you install it. Mods run unsandboxed, with your permissions, and ModsCode does not vouch for what this code does. Read its code (or run claude plugin validate . in its folder), weigh what it reaches, and install the commit you read.

Its repository's .claude-plugin/marketplace.json does not list it, so there is no marketplace line to give.

Try the commit ModsCode read

No marketplace needed. In a terminal, clone the repository, check out the commit read, validate the mod, and load it for one session:

git clone https://github.com/dark-sorceror/Lumen

git -C Lumen checkout 771c628f2815f8ad9488e63970bbea836d4db9a7

claude plugin validate Lumen/plugins

claude --plugin-dir Lumen/plugins

The validate line lists the events the mod hooks and what it asks Claude Code to do, without running it. The last line loads the mod for this session only and writes nothing to your settings. If the author has rewritten history, the commit may no longer exist.

Ask Claude about it

With the ModsCode connector added, Claude can read this mod's code and what it reaches, and build on them. Ask it like this:

Read the ModsCode mod "dark-sorceror-lumen-cache" with its code and make me one like it

Search them from Claude: the MCP connector

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