Context Compression
guanyang/open-agent-hub
This skill should be used when long-running agent sessions need context compression, structured summarization, compaction, token-per-task optimization, or durable handoff summaries that preserve…
When agent sessions generate millions of tokens of conversation history, compression becomes mandatory.
Install Context Compression
$ npx skills add aiskillstore/marketplace --skill context-compression -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install aiskillstore/marketplace context-compression --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/sickn33/context-compression .claude/skills/context-compression && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "context-compression" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-compression into .claude/skills/context-compression/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-compression", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-compressionType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add aiskillstore/marketplace --skill context-compression -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install aiskillstore/marketplace context-compression --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/sickn33/context-compression .agents/skills/context-compression && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "context-compression" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-compression into .agents/skills/context-compression/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-compression", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add aiskillstore/marketplace --skill context-compression -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install aiskillstore/marketplace context-compression --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/sickn33/context-compression .cursor/skills/context-compression && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "context-compression" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-compression into .cursor/skills/context-compression/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-compression", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/aiskillstore/marketplace.git --path skills/sickn33/context-compression--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add aiskillstore/marketplace --skill context-compression -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install aiskillstore/marketplace context-compression --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/sickn33/context-compression .gemini/skills/context-compression && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "context-compression" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-compression into .gemini/skills/context-compression/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-compression", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install aiskillstore/marketplace context-compressionInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add aiskillstore/marketplace --skill context-compression -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/sickn33/context-compression .github/skills/context-compression && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "context-compression" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-compression into .github/skills/context-compression/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-compression", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add aiskillstore/marketplace --skill context-compression -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install aiskillstore/marketplace context-compression --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/sickn33/context-compression .opencode/skills/context-compression && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "context-compression" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/sickn33/context-compression into .opencode/skills/context-compression/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-compression", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
context-compression- GitHub stars
- 430
- Used in
- 5 other repos
- Token cost
- ~3.1k tokens
- SKILL.md length
- 1,373 words
- Files
- 2
- Skills in repo
- 1,085
- Repo updated
- First seen
- Licence
- None found
At a glance
When agent sessions generate millions of tokens of conversation history, compression becomes mandatory.
- Works in 3 steps: Anchored Iterative Summarization:… → Opaque Compression: Produce compressed… → Regenerative Full Summary: Generate…
- Tasks that involve LLM cost and token optimization
- SKILL.md covers When to Use, Core Concepts, Detailed Topics and Practical Guidance, plus 6 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Context Compression is an agent skill from aiskillstore/marketplace. When agent sessions generate millions of tokens of conversation history, compression becomes mandatory. The naive approach is aggressive compression to minimize tokens per request.
Its SKILL.md is about 3.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `skill-report.json`).
It sits in AI & LLM Engineering, covering LLM cost and token optimization. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.
When your agent uses it
- Tasks that involve LLM cost and token optimization
Example prompts
- “/context-compression”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Anchored Iterative Summarization: Maintain structured, persistent summaries with explicit sections for session intent, file modifications…
- Opaque Compression: Produce compressed representations optimized for reconstruction fidelity. Achieves highest compression ratios (99%+)…
- Regenerative Full Summary: Generate detailed structured summaries on each compression. Produces readable output but may lose details…
What it can do on your machine
Read from SKILL.md and the folder at commit 4ac52da. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are markdown).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Context Compression loads about 3.1k tokens when it runs. Until then it costs about 50 tokens; SKILL.md has 1,373 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,373 words (~3,135 tokens).
“When agent sessions generate millions of tokens of conversation history, compression becomes mandatory. The naive approach is aggressive compression to minimize tokens per request. The correct optimization target is tokens per task: total tokens consumed to complete a task, including…”
- name
- context-compression
- risk
- unknown
- source
- community
Files
SKILL.md and 1 other file in skills/sickn33/context-compression of aiskillstore/marketplace.
- SKILL.md
- skill-report.json
Open the folder on GitHubat commit 4ac52da
Used in 5 other repositories
We found 15 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 5 other GitHub owners. This page covers the copy in aiskillstore/marketplace, which our catalogue first saw on October 7, 2026.
- sickn33/agentic-awesome-skillsskills/context-compressionplugins/agentic-awesome-skills/skills/context-compression+1 more
- agent-skills-hub/agent-skills-hubskills/context-compression
- lingxling/awesome-skills-cnantigravity-awesome-skills/skills/context-compressionantigravity-awesome-skills/plugins/agentic-awesome-skills/skills/context-compression+1 more
- benjaminasterA/antigravity-awesome-skillsskills/context-compression
- henryalouf/ruflow.agents/skills/context-compression.agents/skills/antigravity-awesome-skills/skills/context-compression+4 more
Compare with similar skills
Context Compression next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Context Compression this skillaiskillstore/marketplace | 430 | 5 repos | ~3.1k | Automated safety check: Pass | None | |
| Context Compressionguanyang/open-agent-hub | 973 | 2 repos | ~4.6k | Automated safety check: Pass | MIT | |
| Bounty Hunter1sadjlk/bounty-hunter-skill | 282 | 1 repos | ~761 | Automated safety check: Pass | MIT | |
| Skill Shortenerluongnv89/asm | 953 | — | ~3.8k | Automated safety check: Notes | MIT | |
| Fleet Auditoralexgreensh/token-optimizer | 2.5k | — | ~1.7k | Automated safety check: Pass | Custom licence | |
| Context Auditundefined-ui/second-brain-os | 999 | — | ~810 | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Context Compression
What does Context Compression do?
When agent sessions generate millions of tokens of conversation history, compression becomes mandatory. Context Compression is an agent skill from aiskillstore/marketplace. When agent sessions generate millions of tokens of conversation history, compression becomes mandatory.
When should I use Context Compression?
Context Compression fits situations like: tasks that involve LLM cost and token optimization.
How do I install Context Compression in Claude Code?
Run `npx skills add aiskillstore/marketplace --skill context-compression -a claude-code`. Or copy the skill folder (skills/sickn33/context-compression in aiskillstore/marketplace) into .claude/skills/context-compression in your project. Claude Code loads it when a task matches its description.
How do I install Context Compression in Codex?
Run `npx skills add aiskillstore/marketplace --skill context-compression -a codex`. Or copy the skill folder (skills/sickn33/context-compression in aiskillstore/marketplace) into .agents/skills/context-compression in your project. Codex loads it when a task matches its description.
Can I use Context Compression in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add aiskillstore/marketplace --skill context-compression -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/context-compression, .gemini/skills/context-compression, .github/skills/context-compression and .opencode/skills/context-compression in your project.
What does Context Compression need to run?
SKILL.md names no scripts, command-line tools or credentials: Context Compression is instructions for the agent only.
Does Context Compression access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Context Compression safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Context Compression use?
No licence was found for Context Compression or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Context Compression use?
About 3.1k tokens (SKILL.md is roughly 13k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Context Compression?
Skills that share tags, products or a category with Context Compression: Context Compression (guanyang/open-agent-hub, 973 stars), Bounty Hunter (1sadjlk/bounty-hunter-skill, 282 stars), Skill Shortener (luongnv89/asm, 953 stars) and Fleet Auditor (alexgreensh/token-optimizer, 2.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Context Compression?
aiskillstore (a GitHub organization) maintains it in aiskillstore/marketplace, which has 430 GitHub stars. The repository holds 1,085 skills in this directory. The repository was last updated on October 7, 2026.
Source: aiskillstore/marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.