Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add lossless-claude/lcm/plugin install lcmWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/commands/lossless-claude/lcm/lcm-compact)<a href="https://agentmods.dev/commands/lossless-claude/lcm/lcm-compact"><img src="https://agentmods.dev/badge/commands/lossless-claude/lcm/lcm-compact.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00013 | $0.00250 |
| Opus 5 | $0.00006 | $0.00125 |
| Sonnet 5 | $0.00003 | $0.00050 |
| Haiku 4.5 | $0.00001 | $0.00025 |
Grade A, and why
lcm-compact scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
/lcm-compact
Compact unprocessed conversation messages into summarized DAG nodes.
Instructions
Run the following command via Bash:
lcm compact
If lcm is not on PATH (marketplace install), use the plugin-relative binary instead:
node "${CLAUDE_PLUGIN_ROOT}/lcm.mjs" compact
Options
Pass user-specified flags through to the command:
--all— Compact all projects (default: current project only). Forces batch compaction mode regardless of TTY environment, ensuring reliable behavior in automated tools.--dry-run— Preview without writing--replay— Re-compact sessions that already have summaries (by default, already-compacted sessions are skipped)
For example:
/lcm-compact --all→lcm compact --all/lcm-compact --dry-run→lcm compact --dry-run/lcm-compact --replay→lcm compact --replay
Display the output verbatim.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 6d ago First seen · 38 lines · 13 tokens per session scan A 7400303250c7
lcm-compact is a command published in the GitHub repository lossless-claude/lcm (24 stars, last pushed 2d ago), licensed MIT. It adds 13 tokens to every session and 250 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other commands, from other repositories
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memory-store
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cc-memory
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analyze-context
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music-suno-prompt
Grounded Suno prompt synthesis from local knowledge corpus + persona canon + label canon. No vibes-prompting.