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lcm

Lossless context management for Claude Code: keep the full history reachable instead of losing it to compaction.

by @lossless-claude54Updated Broad accessGitHub

Installation

  1. Install from your shell (answer y to add the marketplace)

    $ claude plugin install lcm --marketplace lossless-claude/lcm

Already in a session? Type this at the Claude Code prompt:

$ /plugin install lcm --marketplace lossless-claude/lcm

Pick a scope and the mod is active right away. Needs Claude Code 2.1.287 or later, in a terminal. Full install guide

What does lcm do?

  • Stores every message in a per-project SQLite database and compacts older context into a DAG of summaries
  • Restores project context, recent summaries and promoted memory at session start
  • Searches memory on each prompt and injects hints
  • MCP tools lcm_search, lcm_grep, lcm_expand, lcm_describe, lcm_store, lcm_stats and lcm_doctor
  • lcm CLI for install, search, compaction, import/export and secret redaction patterns

What do you need?

  • Claude Code 2.1.287 or later (terminal)
  • Node.js 22+
  • lcm CLI installed globally: npm install -g @lossless-claude/lcm

What can this mod access?

Read from the mod's code with claude plugin validate on Claude Code 2.1.296, synced Oct 12, 2026. This is a capability list, not a security audit. Mods run with your permissions, so install only from authors you trust.

Broad access
  • Runs programs on your machine
  • Writes files
  • Makes network requests
  • Intercepts or rewrites tool calls
  • Reads or rewrites your prompts
  • Reads environment variables or settings
  • Calls models on your plan (uses quota)
Hooks and engine calls (14 + 12)

hooks

  • classic.PostToolUse
  • classic.PostToolUseFailure
  • classic.SessionStart
  • classic.Stop
  • classic.UserPromptSubmit
  • prompt.context
  • prompt.section{name=memory}
  • prompt.submit
  • session.append
  • session.compact
  • session.end
  • session.start
  • tool.call
  • turn.complete

calls

  • $.clock.after
  • $.clock.sleep
  • $.env.get
  • $.fs.write
  • $.http.fetch
  • $.model.complete
  • $.model.fork
  • $.process.run
  • $.session.cwd
  • $.session.id
  • $.session.model
  • $.ui.log

How do you uninstall lcm?

$ claude plugin uninstall lcm

To switch it off without removing it, use claude plugin disable with the same name.

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