Context Mode Output Sandbox
mksglu/context-mode
Routes large command, file, API and browser output through context-mode tools so only the needed result enters the agent's context, instead of dumping it via Bash.
Optimizes context window via MECW principles and memory tiering.
Install Context Optimization
$ npx skills add athola/claude-night-market --skill context-optimization -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install athola/claude-night-market context-optimization --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/athola/claude-night-market.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/conserve/skills/context-optimization .claude/skills/context-optimization && 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-optimization" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/conserve/skills/context-optimization into .claude/skills/context-optimization/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-optimization", 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/athola/claude-night-market/tree/master/plugins/conserve/skills/context-optimizationType 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 athola/claude-night-market --skill context-optimization -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install athola/claude-night-market context-optimization --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/conserve/skills/context-optimization .agents/skills/context-optimization && 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-optimization" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/conserve/skills/context-optimization into .agents/skills/context-optimization/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-optimization", 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 athola/claude-night-market --skill context-optimization -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install athola/claude-night-market context-optimization --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/conserve/skills/context-optimization .cursor/skills/context-optimization && 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-optimization" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/conserve/skills/context-optimization into .cursor/skills/context-optimization/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-optimization", 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/athola/claude-night-market.git --path plugins/conserve/skills/context-optimization--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 athola/claude-night-market --skill context-optimization -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install athola/claude-night-market context-optimization --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/conserve/skills/context-optimization .gemini/skills/context-optimization && 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-optimization" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/conserve/skills/context-optimization into .gemini/skills/context-optimization/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-optimization", 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 athola/claude-night-market context-optimizationInstalls 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 athola/claude-night-market --skill context-optimization -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/conserve/skills/context-optimization .github/skills/context-optimization && 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-optimization" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/conserve/skills/context-optimization into .github/skills/context-optimization/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-optimization", 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 athola/claude-night-market --skill context-optimization -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install athola/claude-night-market context-optimization --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/conserve/skills/context-optimization .opencode/skills/context-optimization && 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-optimization" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/conserve/skills/context-optimization into .opencode/skills/context-optimization/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "context-optimization", 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-optimization- GitHub stars
- 342
- Token cost
- ~1.4k tokens
- SKILL.md length
- 469 words
- Files
- 13
- Skills in repo
- 160
- Repo updated
- First seen
- Licence
- MIT
At a glance
Optimizes context window via MECW principles and memory tiering.
- Works in 5 steps: Assess context pressure and MECW… → Route to appropriate specialized modules. → Coordinate subagent-based workflows. → …
- Context exceeds 30%
- SKILL.md covers When To Use, When NOT To Use, Core Hub Responsibilities and Module Selection Strategy, plus 6 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Context Optimization is an agent skill from athola/claude-night-market. Optimizes context window via MECW principles and memory tiering. Use when context exceeds 30% or before long multi-step tasks.
Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 13 other files (for example `modules/belief-clarity.md`, `modules/cache-aligned-prefixes.md` and `modules/compression-strategies.md`).
It sits in Agent Workflows, covering Context engineering. It works with Model Context Protocol. The repository describes itself as: 23 Claude Code plugins: TDD enforcement hooks, git/PR workflows, spec-driven development, code review, project lifecycle, fix-from-error, maintenance automation, context… The licence is MIT.
When your agent uses it
- Context exceeds 30%
- Before long multi-step tasks
Example prompts
- “Use the context-optimization skill to optimiz context window via MECW principles and memory tiering”
- “/context-optimization”
Requirements
- Python 3
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Assess context pressure and MECW compliance.
- Route to appropriate specialized modules.
- Coordinate subagent-based workflows.
- Manage token budget allocation across modules.
- Synthesize results from modular execution.
What it can do on your machine
Read from SKILL.md and the folder at commit 9f3eb00. 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 python).
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 Optimization loads about 1.4k tokens when it runs. Until then it costs about 37 tokens; SKILL.md has 469 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
The full file from athola/claude-night-market at commit 9f3eb00, republished under its MIT licence (© athola). 469 words, ~1,422 tokens.
Download SKILL.mdSave it as
.claude/skills/context-optimization/SKILL.md (or your agent's skills folder). This skill also uses 12 other files; get the full folder from GitHub.- name
- context-optimization
- description
- Optimizes context window via MECW principles and memory tiering. Use when context exceeds 30% or before long multi-step tasks.
- alwaysApply
- false
- category
- conservation
- token_budget
- 150
- progressive_loading
- true
- modules
- modules/context-waiting.md, modules/findings-format.md, modules/mecw-assessment.md, modules/mecw-principles.md, modules/memory-tiers.md…
- model_hint
- standard
- role
- hook-target
Context Optimization Hub
When To Use
- Threshold Alert: When context usage approaches 50% of the window.
- Complex Tasks: For operations requiring multi-file analysis or long tool chains.
When NOT To Use
- Simple single-step tasks with low context usage
- Already using mcp-code-execution for tool chains
Core Hub Responsibilities
- Assess context pressure and MECW compliance.
- Route to appropriate specialized modules.
- Coordinate subagent-based workflows.
- Manage token budget allocation across modules.
- Synthesize results from modular execution.
Module Selection Strategy
def select_optimal_modules(context_situation, task_complexity):
if context_situation == "CRITICAL":
return ["mecw-assessment", "subagent-coordination"]
elif task_complexity == "high":
return ["mecw-principles", "subagent-coordination"]
else:
return ["mecw-assessment"]Context Classification
| Utilization | Status | Action |
|---|---|---|
| < 30% | LOW | Continue normally |
| 30-50% | MODERATE | Monitor, apply principles |
| > 50% | CRITICAL | Immediate optimization required |
Large Output Handling (Claude Code 2.1.2+)
Behavior Change: Large bash command and tool outputs are saved to disk instead of being truncated; file references are provided for access.
Impact on Context Optimization
| Scenario | Before 2.1.2 | After 2.1.2 |
|---|---|---|
| Large test output | Truncated, partial data | Full output via file reference |
| Verbose build logs | Lost after 30K chars | Complete, accessible on-demand |
| Context pressure | Less from truncation | Same - only loaded when read |
Best Practices
- Avoid pre-emptive reads: Large outputs are referenced, not automatically loaded into context.
- Read selectively: Use
head,tail, orgrepon file references. - Use full data: Quality gates can access complete test results via files.
- Monitor growth: File references are small, but reading the full files adds to context.
Integration Points
- Token Conservation: Receives usage strategies, returns MECW-compliant optimizations.
- CPU/GPU Performance: Aligns context optimization with resource constraints.
- MCP Code Execution: Delegates complex patterns to specialized MCP modules.
Show full SKILL.md (224 more words)Show less
Resources
- MECW Theory: See
modules/mecw-principles.mdfor core concepts, the 50% rule, and quick-start code examples. - Context Analysis: See
modules/mecw-assessment.mdfor risk identification. - Workflow Delegation: See
modules/subagent-coordination.mdfor decomposition patterns. - Context Waiting: See
modules/context-waiting.mdfor deferred loading strategies. - Cache Alignment: See
modules/cache-aligned-prefixes.mdfor ordering context so provider KV caches hit (stable prefix first, volatile last). - Compression Choice: See
modules/compression-strategies.mdto pick one of/clearand/catchup, a continuation agent, archive and summarize, or delegation, with savings and risk. - Large Tool Outputs: See
modules/reversible-compression.mdfor archiving an oversized output to a retrievable handle. - Pasted Logs: See
modules/log-debugging-hygiene.mdfor filtering a log before any compression./filter-loganchors on it.
Troubleshooting
Common Issues
If context usage remains high after optimization, check for large files that were read entirely rather than selectively. If MECW assessments fail, ensure that your environment provides accurate token count metadata. For permission errors when writing output logs to /tmp, verify that the project's temporary directory is writable.
Exit Criteria
- Context pressure assessed against the MECW 50% rule
- A memory tier or routing decision recorded for the current state
- Large outputs referenced by file or handle, not read in full
- When the request controls the provider payload, prefix ordering checked
against
modules/cache-aligned-prefixes.md(stable first, volatile last) - Optimization downgraded to advisory when the harness already caches (cache writes cost more than they save on non-repeated prefixes)
© athola, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 12 other files in plugins/conserve/skills/context-optimization of athola/claude-night-market.
- SKILL.md
- modules/belief-clarity.md
- modules/cache-aligned-prefixes.md
- modules/compression-strategies.md
- modules/context-waiting.md
- modules/findings-format.md
- modules/log-debugging-hygiene.md
- modules/mecw-assessment.md
- modules/mecw-principles.md
- modules/memory-tiers.md
- modules/reversible-compression.md
- modules/session-routing.md
- modules/subagent-coordination.md
Open the folder on GitHubat commit 9f3eb00
Compare with similar skills
Context Optimization 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 Optimization this skillathola/claude-night-market | 342 | — | ~1.4k | Automated safety check: Pass | MIT | |
| Context Mode Output Sandboxmksglu/context-mode | 26k | — | ~4.1k | Automated safety check: Pass | Custom licence | |
| Context Mode for Antigravity CLImksglu/context-mode | 26k | — | ~850 | Automated safety check: Pass | Custom licence | |
| Base HelpChristopherKahler/base | 287 | — | ~2.6k | Automated safety check: Pass | Custom licence | |
| LemmalogJordyZomer/lemmalog | 329 | — | ~2.8k | Automated safety check: Pass | MIT | |
| Cortex Mem MCPsopaco/cortex-mem | 312 | — | ~2.8k | Automated safety check: Pass | MIT |
Similar skills
Context Mode for Antigravity CLI
mksglu/context-mode
Routing rules for using context-mode MCP tools in Antigravity CLI: sandboxed code runs, file analysis, indexed search and web fetches that keep large output out of the conversation.
Base Help
ChristopherKahler/base
Coach mode for the base CLI: teaches what to do and why, rather than just answering.
Lemmalog
JordyZomer/lemmalog
Externalize working memory and logical state into the lemmalog Datalog engine (MCP).
Cortex Mem MCP
sopaco/cortex-mem
Persistent memory enhancement for AI agents. An agent skill from sopaco/cortex-mem.
MCP Code Search Tool Selection
Context-Engine-AI/Context-Engine
Rules for choosing Qdrant-Indexer semantic search over grep or file reads when exploring code, debugging or asking where and why questions.
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Questions about Context Optimization
What does Context Optimization do?
Optimizes context window via MECW principles and memory tiering. Context Optimization is an agent skill from athola/claude-night-market. Optimizes context window via MECW principles and memory tiering.
When should I use Context Optimization?
Context Optimization fits situations like: context exceeds 30%; before long multi-step tasks.
How do I install Context Optimization in Claude Code?
Run `npx skills add athola/claude-night-market --skill context-optimization -a claude-code`. Or copy the skill folder (plugins/conserve/skills/context-optimization in athola/claude-night-market) into .claude/skills/context-optimization in your project. Claude Code loads it when a task matches its description.
How do I install Context Optimization in Codex?
Run `npx skills add athola/claude-night-market --skill context-optimization -a codex`. Or copy the skill folder (plugins/conserve/skills/context-optimization in athola/claude-night-market) into .agents/skills/context-optimization in your project. Codex loads it when a task matches its description.
Can I use Context Optimization 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 athola/claude-night-market --skill context-optimization -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-optimization, .gemini/skills/context-optimization, .github/skills/context-optimization and .opencode/skills/context-optimization in your project.
What does Context Optimization need to run?
SKILL.md names no scripts, command-line tools or credentials: Context Optimization is instructions for the agent only. Our summary lists: Python 3.
Does Context Optimization 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 Optimization 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 Optimization use?
Context Optimization is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Context Optimization use?
About 1.4k tokens (SKILL.md is roughly 5.7k 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 Optimization?
Skills that share tags, products or a category with Context Optimization: Context Mode Output Sandbox (mksglu/context-mode, 26k stars), Context Mode for Antigravity CLI (mksglu/context-mode, 26k stars), Base Help (ChristopherKahler/base, 287 stars) and Lemmalog (JordyZomer/lemmalog, 329 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Context Optimization?
athola (a GitHub user) maintains it in athola/claude-night-market, which has 342 GitHub stars. The repository holds 160 skills in this directory. The repository was last updated on October 6, 2026.
Source: athola/claude-night-market on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.