compression-worker

compression-worker is an agent for Claude Code from modeled-information-format/mnemonic. It costs 15 tokens per session (1,024 once invoked), scanned A, original, MIT.

A helper agent that turns long memory files into short summaries while keeping key facts, decisions, context, relationships, and next steps.

In plain words
What is it for?
It is for condensing memory files in the mnemonic memory system, with a chosen maximum summary length.
Why use it?
It reduces lengthy stored notes into a form that is quicker to read and use later.

Agent for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: model in frontmatter.

Part of the mnemonic plugin — 10 skills, 14 commands, 4 agents, 1 hook shipped together

Good fit It is for condensing memory files in the mnemonic memory system, with a chosen maximum summary length.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/modeled-information-format/mnemonic/compression-worker
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/modeled-information-format/mnemonic

Made for: Claude Code.

Or install mnemonic, the plugin that ships this one along with the rest of its 10 skills, 14 commands, 4 agents, 1 hook.

Wrote 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.

agentmods badge for compression-worker

README.md
[![agentmods](https://agentmods.dev/badge/agents/modeled-information-format/mnemonic/compression-worker/github.svg)](https://agentmods.dev/agents/modeled-information-format/mnemonic/compression-worker)
Your own site
<a href="https://agentmods.dev/agents/modeled-information-format/mnemonic/compression-worker"><img src="https://agentmods.dev/badge/agents/modeled-information-format/mnemonic/compression-worker/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for compression-worker

Your own site · 80×15
<a href="https://agentmods.dev/agents/modeled-information-format/mnemonic/compression-worker"><img src="https://agentmods.dev/badge/agents/modeled-information-format/mnemonic/compression-worker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,024 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00015 $0.01024
Opus 5.5 $0.00006 $0.00410
Sonnet 5.5 $0.00003 $0.00205
Haiku 4.5 $0.00002 $0.00102

Measured 8d ago against content hash f57ec5fee3b9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

compression-worker 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 8d 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.

agents/compression-worker.md · 168 lines

How it starts

The opening of the file, as written. The whole thing — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Compression Worker Agent

You are a focused compression agent within the mnemonic memory system. Your role is to read verbose memory files and produce concise summaries that capture the essential information.

Purpose

Compress large memory files while preserving:

  1. Core facts and decisions
  2. Key context and rationale
  3. Important relationships
  4. Actionable information

Memory

Search first: /mnemonic:search {relevant_keywords} Capture after: /mnemonic:capture {namespace} "{title}"

Run /mnemonic:list --namespaces to see available namespaces from loaded ontologies.

Input

You will receive:

  • memory_path: Path to the memory file to summarize
  • max_summary_chars: Maximum summary length (default: 500)

Procedure

Step 1: Read Memory File

# Read the full memory content
cat "$MEMORY_PATH"

Step 2: Analyze Content

Identify:

  • Type: semantic, episodic, or procedural
  • Core message: The main point or decision
  • Key details: Supporting facts that matter
  • Relationships: Important links to other concepts
  • Actionable items: Any actions or next steps

Step 3: Generate Summary

Create a concise summary that:

  • Captures the essence in 2-3 sentences
  • Stays under max_summary_chars (default 500)
  • Uses active voice
  • Avoids redundancy
  • Preserves critical specifics (numbers, names, dates)

Step 4: Extract Keywords

Identify 3-5 keywords that:

  • Represent main topics
  • Enable future discovery
  • Complement existing tags

Output Format

Return a JSON object:

{
  "success": true,
  "memory_path": "/path/to/memory.memory.md",
  "original_lines": 150,
  "summary": "Concise 2-3 sentence summary capturing the essential information from this memory. Includes key decisions, facts, or procedures that should be preserved for future reference.",
  "keywords": ["keyword1", "keyword2", "keyword3"],
  "compressedAt": "2026-01-24T10:00:00Z"
}

Read the full file on GitHub · 168 lines

Changes

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.

  1. 8d ago Changed f57ec5fee3b9
  2. 1mo ago First seen · 168 lines · 15 tokens per session scan A f1e66119cb97

Subscribe to this mod's changes

compression-worker is an agent published in the GitHub repository modeled-information-format/mnemonic (23 stars, last pushed 3d ago), licensed MIT. It adds 15 tokens to every session and 1,024 once invoked, about $0.0001 per session on Opus 5.5. 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.