MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Context Control Center — one screen for budget, $ spent, tokens saved, waste, last prompt grade, the active task, and ready-to-run optimization actions
Install Cco
$ npx skills add egorfedorov/claude-context-optimizer --skill cco -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install egorfedorov/claude-context-optimizer cco --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/egorfedorov/claude-context-optimizer.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/cco .claude/skills/cco && 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 "cco" agent skill from https://github.com/egorfedorov/claude-context-optimizer/tree/main/skills/cco into .claude/skills/cco/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cco", 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/egorfedorov/claude-context-optimizer/tree/main/skills/ccoType 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 egorfedorov/claude-context-optimizer --skill cco -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install egorfedorov/claude-context-optimizer cco --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/egorfedorov/claude-context-optimizer.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/cco .agents/skills/cco && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cco" agent skill from https://github.com/egorfedorov/claude-context-optimizer/tree/main/skills/cco into .agents/skills/cco/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cco", 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 egorfedorov/claude-context-optimizer --skill cco -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install egorfedorov/claude-context-optimizer cco --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/egorfedorov/claude-context-optimizer.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/cco .cursor/skills/cco && 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 "cco" agent skill from https://github.com/egorfedorov/claude-context-optimizer/tree/main/skills/cco into .cursor/skills/cco/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cco", 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/egorfedorov/claude-context-optimizer.git --path skills/cco--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 egorfedorov/claude-context-optimizer --skill cco -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install egorfedorov/claude-context-optimizer cco --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/egorfedorov/claude-context-optimizer.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/cco .gemini/skills/cco && 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 "cco" agent skill from https://github.com/egorfedorov/claude-context-optimizer/tree/main/skills/cco into .gemini/skills/cco/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cco", 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 egorfedorov/claude-context-optimizer ccoInstalls 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 egorfedorov/claude-context-optimizer --skill cco -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/egorfedorov/claude-context-optimizer.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/cco .github/skills/cco && 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 "cco" agent skill from https://github.com/egorfedorov/claude-context-optimizer/tree/main/skills/cco into .github/skills/cco/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cco", 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 egorfedorov/claude-context-optimizer --skill cco -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install egorfedorov/claude-context-optimizer cco --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/egorfedorov/claude-context-optimizer.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/cco .opencode/skills/cco && 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 "cco" agent skill from https://github.com/egorfedorov/claude-context-optimizer/tree/main/skills/cco into .opencode/skills/cco/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cco", 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
cco- GitHub stars
- 114
- Token cost
- ~465 tokens
- SKILL.md length
- 216 words
- Files
- 1
- Skills in repo
- 13
- Repo updated
- First seen
- Licence
- MIT
At a glance
Context Control Center — one screen for budget, $ spent, tokens saved, waste, last prompt grade, the active task, and ready-to-run optimization actions
- Works in 2 steps: Show the board → (Optional) per-file heatmap
- Agent Workflows work in your project
- SKILL.md covers 1. Show the board and 2. (Optional) per-file heatmap
- Calls node
What it does
Cco is an agent skill from egorfedorov/claude-context-optimizer. Context Control Center — one screen for budget, $ spent, tokens saved, waste, last prompt grade, the active task, and ready-to-run optimization actions
Its SKILL.md is about 470 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Agent Workflows. The repository describes itself as: Claude Code plugin that tracks token usage, identifies wasted context, and saves 30-50% on API costs. Heatmaps, ROI reports, budget alerts, efficiency scores, git-aware… The licence is MIT.
When your agent uses it
- Agent Workflows work in your project
Example prompts
- “/cco”
Requirements
- Pre-approved tools (allowed-tools): Bash(node ${CLAUDE_PLUGIN_ROOT}/src/dashboard.js:*), Bash(node ${CLAUDE_PLUGIN_ROOT}/src/tracker.js:*), Read
Workflow steps
2 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit f6f20ee. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
Bash(node ${CLAUDE_PLUGIN_ROOT}/src/dashboard.js:*)Bash(node ${CLAUDE_PLUGIN_ROOT}/src/tracker.js:*)Read
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
node
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
Cco loads about 465 tokens when it runs. Until then it costs about 39 tokens; SKILL.md has 216 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 egorfedorov/claude-context-optimizer at commit f6f20ee, republished under its MIT licence (© egorfedorov). 216 words, ~465 tokens.
Download SKILL.mdSave it as
.claude/skills/cco/SKILL.md (or your agent's skills folder).- name
- cco
- description
- Context Control Center — one screen for budget, $ spent, tokens saved, waste, last prompt grade, the active task, and ready-to-run optimization actions
- allowed-tools
- Bash(node ${CLAUDE_PLUGIN_ROOT}/src/dashboard.js:*), Bash(node ${CLAUDE_PLUGIN_ROOT}/src/tracker.js:*), Read
- license
- MIT
Context Control Center
The all-in-one view of the current session. Show the user the live board, then the per-file heatmap if they want detail.
1. Show the board
node ${CLAUDE_PLUGIN_ROOT}/src/dashboard.js boardThis renders, in one screen:
- Budget — % of the effective context window used + $ spent this session
- Saved — tokens the Read Cache blocked → the effectiveness multiplier (e.g. "1.4x")
- Waste — cold context (read but never edited) you can drop to free budget
- Prompt — grade of the last prompt (from Prompt Coach)
- Task — the active task and its token/$ cost (per-task attribution)
- Actions — concrete next steps: what to drop →
/compact, what to/cco-pack
Present the board as-is. Then, based on what it shows:
- If an action line suggests dropping cold files, offer to run
/compact. - If no task is active, suggest
/cco-task add "<what they're working on>"so the board can attribute tokens per task. - If the prompt grade is low (C/D/F), suggest
/cco-coach.
2. (Optional) per-file heatmap
If the user wants the file-by-file breakdown:
node ${CLAUDE_PLUGIN_ROOT}/src/tracker.js heatmapHighlight files read but never used (waste), files that were edited (high-value), and the total token usage / waste percentage.
If there is no data yet, tell the user: "No data in this session yet — keep working. Reads, edits, prompts and cache savings are tracked automatically; run /cco again to see the board fill in."
© egorfedorov, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/cco of egorfedorov/claude-context-optimizer.
Open the folder on GitHubat commit f6f20ee
Compare with similar skills
Cco 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 |
|---|---|---|---|---|---|---|
| Cco this skillegorfedorov/claude-context-optimizer | 114 | — | ~465 | Automated safety check: Pass | MIT | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 38k | 10 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Using Superpowersfarm-fe/farm | 5.6k | 35 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Executing Plans Inlineobra/superpowers | 297k | 2 repos | ~5.1k | Automated safety check: Pass | MIT | |
| Skill CreatorAzure/azqr | 795 | 89 repos | ~8.2k | Automated safety check: Pass | Apache-2.0 |
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Using Superpowers
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More from egorfedorov/claude-context-optimizer
All 13 skills in this repoSmart Loader
egorfedorov/claude-context-optimizer
Automatically suggests optimal files to preload based on the user's task description and historical context patterns.
Cco Budget
egorfedorov/claude-context-optimizer
Configure token budget limits, auto-compact settings, and view current budget status (model-aware — Claude 5 lineup, Opus 5.5 default fallback, full 1M context at standard price)
Cco Config
egorfedorov/claude-context-optimizer
View and tune CCO's behavior thresholds — re-read warnings, cache staleness, prompt-coach length bands, and the /cco-pack budget cap
Cco Patterns
egorfedorov/claude-context-optimizer
Share learned file patterns across a team — export an anonymized digest of what's usually waste/useful/co-edited, and import a teammate's so a fresh clone benefits day one
Cco Shield
egorfedorov/claude-context-optimizer
Show ContextShield status and waste protection stats; suggest or apply .contextignore rules from historical waste
Cco Task
egorfedorov/claude-context-optimizer
Organize work by task, track tokens/cost per task, and keep a small patchable execution state that is re-injected after /compact (SKILL.state-style) — start a task, patch its state, list tasks, or…
Related
Categories
Questions about Cco
What does Cco do?
Context Control Center — one screen for budget, $ spent, tokens saved, waste, last prompt grade, the active task, and ready-to-run optimization actions. Cco is an agent skill from egorfedorov/claude-context-optimizer.
When should I use Cco?
Cco fits situations like: agent Workflows work in your project.
How do I install Cco in Claude Code?
Run `npx skills add egorfedorov/claude-context-optimizer --skill cco -a claude-code`. Or copy the skill folder (skills/cco in egorfedorov/claude-context-optimizer) into .claude/skills/cco in your project. Claude Code loads it when a task matches its description.
How do I install Cco in Codex?
Run `npx skills add egorfedorov/claude-context-optimizer --skill cco -a codex`. Or copy the skill folder (skills/cco in egorfedorov/claude-context-optimizer) into .agents/skills/cco in your project. Codex loads it when a task matches its description.
Can I use Cco 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 egorfedorov/claude-context-optimizer --skill cco -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cco, .gemini/skills/cco, .github/skills/cco and .opencode/skills/cco in your project.
What does Cco need to run?
Going by SKILL.md and its folder, Cco needs the command-line tools its instructions call (node). Its frontmatter pre-approves these tools: Bash(node ${CLAUDE_PLUGIN_ROOT}/src/dashboard.js:*), Bash(node ${CLAUDE_PLUGIN_ROOT}/src/tracker.js:*), Read.
Does Cco 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 Cco 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 Cco use?
Cco is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Cco use?
About 465 tokens (SKILL.md is roughly 1.9k 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 Cco?
Skills that share tags, products or a category with Cco: MCP Server Builder (anthropics/skills, 180k stars), Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Using Superpowers (farm-fe/farm, 5.6k stars) and Executing Plans Inline (obra/superpowers, 297k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cco?
egorfedorov (a GitHub user) maintains it in egorfedorov/claude-context-optimizer, which has 114 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on September 30, 2026.
Source: egorfedorov/claude-context-optimizer on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.